mirror of
https://github.com/a52xq-dev/kernel.git
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-----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEZH8oZUiU471FcZm+ONu9yGCSaT4FAl9vZgoACgkQONu9yGCS aT6CSBAAqsWMXD4MWA35hVDaFmbMOQkZzdDPTIYzRSDIDMqkbtL+4XAPzqfP7yJH CvQwqSi5XxqBFnlZwIMvY9cbhEumYUyWbFT0rK07ZJApT2uDBcfdZiFxDP/I0vQk Fj5uuFFORs39Kv2CUYWHgkyS0KcrSul5kwfxWblJADZNq5eJp6vnOBHMc59uRP14 SaWWXac9ltGecIn2yKkVz28lW0iI8gSnIf5Bj1/kWC8vcRcaWP2biwflwz6PjFi6 dfKWYN4t7wNK/cM0RigRp7suuIcpvcNv5yu+al2Ul0vi4zn5Po8Kt8Bancn/iWR5 5aCtvhT6OyuQfD67HxSMLZLcEH9X/C7pv+0sEIYlOb1j1IiEec4XrEs8ivlFpl0/ weG+fEM6gyd4+IxTBkLAHQah8s4kSM9fWmyrLFqMyw3O1ImvImjrQmWMnZdDWBtO BGe5IuCMaFbCzbTGZRNZ7PG8EF3ayGYl16rE2FsHawDACp97p6Tih5Y6suwp9vYM Ph4IhNWNYTs1DcgOhqKLTnhbbF1IeJ8kJiVU3nOA7xyLwzdAxwHWk8NEN2yxhz5D aM8YS75gAqRp6km9OPKWG+M9THgT4RtI1O/fAA26CRMc505LRi+w4qPtEMJUPocU v6oJwB3T5BJdkdHPGcJi84hjqea2VGzG5x/cTI2a985DaoNtvc8= =uvGG -----END PGP SIGNATURE----- Merge 4.19.148 into android-4.19-stable Changes in 4.19.148 af_key: pfkey_dump needs parameter validation KVM: fix memory leak in kvm_io_bus_unregister_dev() kprobes: fix kill kprobe which has been marked as gone mm/thp: fix __split_huge_pmd_locked() for migration PMD cxgb4: Fix offset when clearing filter byte counters geneve: add transport ports in route lookup for geneve hdlc_ppp: add range checks in ppp_cp_parse_cr() ip: fix tos reflection in ack and reset packets ipv6: avoid lockdep issue in fib6_del() net: DCB: Validate DCB_ATTR_DCB_BUFFER argument net: dsa: rtl8366: Properly clear member config net: ipv6: fix kconfig dependency warning for IPV6_SEG6_HMAC net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc nfp: use correct define to return NONE fec tipc: Fix memory leak in tipc_group_create_member() tipc: fix shutdown() of connection oriented socket tipc: use skb_unshare() instead in tipc_buf_append() bnxt_en: return proper error codes in bnxt_show_temp bnxt_en: Protect bnxt_set_eee() and bnxt_set_pauseparam() with mutex. net: phy: Avoid NPD upon phy_detach() when driver is unbound net: qrtr: check skb_put_padto() return value net: add __must_check to skb_put_padto() ipv4: Update exception handling for multipath routes via same device MAINTAINERS: add CLANG/LLVM BUILD SUPPORT info kbuild: add OBJSIZE variable for the size tool Documentation/llvm: add documentation on building w/ Clang/LLVM Documentation/llvm: fix the name of llvm-size net: wan: wanxl: use allow to pass CROSS_COMPILE_M68k for rebuilding firmware net: wan: wanxl: use $(M68KCC) instead of $(M68KAS) for rebuilding firmware x86/boot: kbuild: allow readelf executable to be specified kbuild: remove AS variable kbuild: replace AS=clang with LLVM_IAS=1 kbuild: support LLVM=1 to switch the default tools to Clang/LLVM mm: memcg: fix memcg reclaim soft lockup tcp_bbr: refactor bbr_target_cwnd() for general inflight provisioning tcp_bbr: adapt cwnd based on ack aggregation estimation serial: 8250: Avoid error message on reprobe Linux 4.19.148 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I5077093f58ae882547e3b23c5bbd4dfe78116071 
Greg Kroah-Hartman
commited |
5d5e582aab | |
[ Upstream commit b0399092ccebd9feef68d4ceb8d6219a8c0caa05 ]
If a kprobe is marked as gone, we should not kill it again. Otherwise, we
can disarm the kprobe more than once. In that case, the statistics of
kprobe_ftrace_enabled can unbalance which can lead to that kprobe do not
work.
Fixes:
Muchun Song
authored and
 Greg Kroah-Hartman
commited |
d44a437826 | |
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ARM: dts: socfpga: fix register entry for timer3 on Arria10 ARM: dts: ls1021a: fix QuadSPI-memory reg range RDMA/rxe: Fix memleak in rxe_mem_init_user RDMA/rxe: Drop pointless checks in rxe_init_ports RDMA/bnxt_re: Do not report transparent vlan from QP1 drm/sun4i: Fix dsi dcs long write function scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA RDMA/core: Fix reported speed and width mmc: sdhci-msm: Add retries when all tuning phases are found valid ARM: dts: bcm: HR2: Fixed QSPI compatible string ARM: dts: NSP: Fixed QSPI compatible string ARM: dts: BCM5301X: Fixed QSPI compatible string arm64: dts: ns2: Fixed QSPI compatible string ARC: HSDK: wireup perf irq dmaengine: acpi: Put the CSRT table after using it netfilter: conntrack: allow sctp hearbeat after connection re-use drivers/net/wan/lapbether: Added needed_tailroom NFC: st95hf: Fix memleak in st95hf_in_send_cmd firestream: Fix memleak in fs_open ALSA: hda: Fix 2 channel swapping for Tegra drivers/net/wan/lapbether: Set network_header before transmitting xfs: initialize the shortform attr header padding entry irqchip/eznps: Fix build error for !ARC700 builds nvme-fabrics: don't check state NVME_CTRL_NEW for request acceptance nvme-rdma: serialize controller teardown sequences HID: quirks: Set INCREMENT_USAGE_ON_DUPLICATE for all Saitek X52 devices drivers/net/wan/hdlc_cisco: Add hard_header_len HID: elan: Fix memleak in elan_input_configured ARC: [plat-hsdk]: Switch ethernet phy-mode to rgmii-id cpufreq: intel_pstate: Refuse to turn off with HWP enabled cpufreq: intel_pstate: Fix intel_pstate_get_hwp_max() for turbo disabled ALSA: hda: fix a runtime pm issue in SOF when integrated GPU is disabled drm/amdgpu: Fix bug in reporting voltage for CIK iommu/amd: Do not use IOMMUv2 functionality when SME is active gcov: Disable gcov build with GCC 10 iio: adc: mcp3422: fix locking scope iio: adc: mcp3422: fix locking on error path iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set iio:light:ltr501 Fix timestamp alignment issue. iio:accel:bmc150-accel: Fix timestamp alignment and prevent data leak. iio:adc:ti-adc084s021 Fix alignment and data leak issues. iio:adc:ina2xx Fix timestamp alignment issue. iio:adc:max1118 Fix alignment of timestamp and data leak issues iio:adc:ti-adc081c Fix alignment and data leak issues iio:magnetometer:ak8975 Fix alignment and data leak issues. iio:light:max44000 Fix timestamp alignment and prevent data leak. iio:chemical:ccs811: Fix timestamp alignment and prevent data leak. iio: accel: kxsd9: Fix alignment of local buffer. iio:accel:mma7455: Fix timestamp alignment and prevent data leak. iio:accel:mma8452: Fix timestamp alignment and prevent data leak. staging: wlan-ng: fix out of bounds read in prism2sta_probe_usb() btrfs: require only sector size alignment for parent eb bytenr btrfs: fix lockdep splat in add_missing_dev btrfs: fix wrong address when faulting in pages in the search ioctl regulator: push allocation in set_consumer_device_supply() out of lock scsi: target: iscsi: Fix data digest calculation scsi: target: iscsi: Fix hang in iscsit_access_np() when getting tpg->np_login_sem drm/tve200: Stabilize enable/disable drm/msm: Disable preemption on all 5xx targets rbd: require global CAP_SYS_ADMIN for mapping and unmapping RDMA/rxe: Fix the parent sysfs read when the interface has 15 chars vgacon: remove software scrollback support fbcon: remove soft scrollback code fbcon: remove now unusued 'softback_lines' cursor() argument KVM: VMX: Don't freeze guest when event delivery causes an APIC-access exit ARM: dts: vfxxx: Add syscon compatible with OCOTP video: fbdev: fix OOB read in vga_8planes_imageblit() staging: greybus: audio: fix uninitialized value issue phy: qcom-qmp: Use correct values for ipq8074 PCIe Gen2 PHY init usb: core: fix slab-out-of-bounds Read in read_descriptors USB: serial: ftdi_sio: add IDs for Xsens Mti USB converter USB: serial: option: support dynamic Quectel USB compositions USB: serial: option: add support for SIM7070/SIM7080/SIM7090 modules usb: Fix out of sync data toggle if a configured device is reconfigured usb: typec: ucsi: acpi: Check the _DEP dependencies gcov: add support for GCC 10.1 Linux 4.19.146 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: Ic9b467bc37c7cbbc1e9704d662bc0c8fda05416e
Greg Kroah-Hartman
commited |
443485d847 | |
[ Upstream commit 40249c6962075c040fd071339acae524f18bfac9 ] Using gcov to collect coverage data for kernels compiled with GCC 10.1 causes random malfunctions and kernel crashes. This is the result of a changed GCOV_COUNTERS value in GCC 10.1 that causes a mismatch between the layout of the gcov_info structure created by GCC profiling code and the related structure used by the kernel. Fix this by updating the in-kernel GCOV_COUNTERS value. Also re-enable config GCOV_KERNEL for use with GCC 10. Reported-by: Colin Ian King <colin.king@canonical.com> Reported-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com> Tested-by: Leon Romanovsky <leonro@nvidia.com> Tested-and-Acked-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
Peter Oberparleiter
authored and
Greg Kroah-Hartman
commited |
87bf8f8733 | |
[ Upstream commit cfc905f158eaa099d6258031614d11869e7ef71c ] GCOV built with GCC 10 doesn't initialize n_function variable. This produces different kernel panics as was seen by Colin in Ubuntu and me in FC 32. As a workaround, let's disable GCOV build for broken GCC 10 version. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288 Link: https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org Link: https://lore.kernel.org/lkml/CAHk-=whbijeSdSvx-Xcr0DPMj0BiwhJ+uiNnDSVZcr_h_kg7UA@mail.gmail.com/ Cc: Colin Ian King <colin.king@canonical.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
Leon Romanovsky
authored and
Greg Kroah-Hartman
commited |
4a31e14df3 | |
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potential wrong skb->protocol in skb_vlan_untag() net: qrtr: fix usage of idr in port assignment to socket net/smc: Prevent kernel-infoleak in __smc_diag_dump() tipc: fix uninit skb->data in tipc_nl_compat_dumpit() net: ena: Make missed_tx stat incremental ipvlan: fix device features ALSA: pci: delete repeated words in comments ASoC: img: Fix a reference count leak in img_i2s_in_set_fmt ASoC: img-parallel-out: Fix a reference count leak ASoC: tegra: Fix reference count leaks. mfd: intel-lpss: Add Intel Emmitsburg PCH PCI IDs arm64: dts: qcom: msm8916: Pull down PDM GPIOs during sleep powerpc/xive: Ignore kmemleak false positives media: pci: ttpci: av7110: fix possible buffer overflow caused by bad DMA value in debiirq() blktrace: ensure our debugfs dir exists scsi: target: tcmu: Fix crash on ARM during cmd completion iommu/iova: Don't BUG on invalid PFNs drm/amdkfd: Fix reference count leaks. drm/radeon: fix multiple reference count leak drm/amdgpu: fix ref count leak in amdgpu_driver_open_kms drm/amd/display: fix ref count leak in amdgpu_drm_ioctl drm/amdgpu: fix ref count leak in amdgpu_display_crtc_set_config drm/amdgpu/display: fix ref count leak when pm_runtime_get_sync fails scsi: lpfc: Fix shost refcount mismatch when deleting vport xfs: Don't allow logging of XFS_ISTALE inodes selftests/powerpc: Purge extra count_pmc() calls of ebb selftests f2fs: fix error path in do_recover_data() omapfb: fix multiple reference count leaks due to pm_runtime_get_sync PCI: Fix pci_create_slot() reference count leak ARM: dts: ls1021a: output PPS signal on FIPER2 rtlwifi: rtl8192cu: Prevent leaking urb mips/vdso: Fix resource leaks in genvdso.c cec-api: prevent leaking memory through hole in structure HID: quirks: add NOGET quirk for Logitech GROUP f2fs: fix use-after-free issue drm/nouveau/drm/noveau: fix reference count leak in nouveau_fbcon_open drm/nouveau: fix reference count leak in nv50_disp_atomic_commit drm/nouveau: Fix reference count leak in nouveau_connector_detect locking/lockdep: Fix overflow in presentation of average lock-time btrfs: file: reserve qgroup space after the hole punch range is locked scsi: iscsi: Do not put host in iscsi_set_flashnode_param() ceph: fix potential mdsc use-after-free crash scsi: fcoe: Memory leak fix in fcoe_sysfs_fcf_del() EDAC/ie31200: Fallback if host bridge device is already initialized KVM: arm64: Fix symbol dependency in __hyp_call_panic_nvhe powerpc/spufs: add CONFIG_COREDUMP dependency USB: sisusbvga: Fix a potential UB casued by left shifting a negative value efi: provide empty efi_enter_virtual_mode implementation Revert "ath10k: fix DMA related firmware crashes on multiple devices" media: gpio-ir-tx: improve precision of transmitted signal due to scheduling drm/msm/adreno: fix updating ring fence nvme-fc: Fix wrong return value in __nvme_fc_init_request() null_blk: fix passing of REQ_FUA flag in null_handle_rq i2c: rcar: in slave mode, clear NACK earlier usb: gadget: f_tcm: Fix some resource leaks in some error paths jbd2: make sure jh have b_transaction set in refile/unfile_buffer ext4: don't BUG on inconsistent journal feature ext4: handle read only external journal device jbd2: abort journal if free a async write error metadata buffer ext4: handle option set by mount flags correctly ext4: handle error of ext4_setup_system_zone() on remount ext4: correctly restore system zone info when remount fails fs: prevent BUG_ON in submit_bh_wbc() spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate s390/cio: add cond_resched() in the slow_eval_known_fn() loop ASoC: wm8994: Avoid attempts to read unreadable registers scsi: fcoe: Fix I/O path allocation scsi: ufs: Fix possible infinite loop in ufshcd_hold scsi: ufs: Improve interrupt handling for shared interrupts scsi: ufs: Clean up completed request without interrupt notification scsi: qla2xxx: Check if FW supports MQ before enabling scsi: qla2xxx: Fix null pointer access during disconnect from subsystem Revert "scsi: qla2xxx: Fix crash on qla2x00_mailbox_command" macvlan: validate setting of multiple remote source MAC addresses net: gianfar: Add of_node_put() before goto statement powerpc/perf: Fix soft lockups due to missed interrupt accounting block: loop: set discard granularity and alignment for block device backed loop HID: i2c-hid: Always sleep 60ms after I2C_HID_PWR_ON commands blk-mq: order adding requests to hctx->dispatch and checking SCHED_RESTART btrfs: reset compression level for lzo on remount btrfs: fix space cache memory leak after transaction abort fbcon: prevent user font height or width change from causing potential out-of-bounds access USB: lvtest: return proper error code in probe vt: defer kfree() of vc_screenbuf in vc_do_resize() vt_ioctl: change VT_RESIZEX ioctl to check for error return from vc_resize() serial: samsung: Removes the IRQ not found warning serial: pl011: Fix oops on -EPROBE_DEFER serial: pl011: Don't leak amba_ports entry on driver register error serial: 8250_exar: Fix number of ports for Commtech PCIe cards serial: 8250: change lock order in serial8250_do_startup() writeback: Protect inode->i_io_list with inode->i_lock writeback: Avoid skipping inode writeback writeback: Fix sync livelock due to b_dirty_time processing XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information. usb: host: xhci: fix ep context print mismatch in debugfs xhci: Do warm-reset when both CAS and XDEV_RESUME are set xhci: Always restore EP_SOFT_CLEAR_TOGGLE even if ep reset failed PM: sleep: core: Fix the handling of pending runtime resume requests device property: Fix the secondary firmware node handling in set_primary_fwnode() genirq/matrix: Deal with the sillyness of for_each_cpu() on UP irqchip/stm32-exti: Avoid losing interrupts due to clearing pending bits by mistake drm/amdgpu: Fix buffer overflow in INFO ioctl drm/amd/pm: correct Vega10 swctf limit setting drm/amd/pm: correct Vega12 swctf limit setting USB: yurex: Fix bad gfp argument usb: uas: Add quirk for PNY Pro Elite USB: quirks: Add no-lpm quirk for another Raydium touchscreen USB: quirks: Ignore duplicate endpoint on Sound Devices MixPre-D USB: Ignore UAS for JMicron JMS567 ATA/ATAPI Bridge usb: host: ohci-exynos: Fix error handling in exynos_ohci_probe() USB: gadget: u_f: add overflow checks to VLA macros USB: gadget: f_ncm: add bounds checks to ncm_unwrap_ntb() USB: gadget: u_f: Unbreak offset calculation in VLAs USB: cdc-acm: rework notification_buffer resizing usb: storage: Add unusual_uas entry for Sony PSZ drives btrfs: check the right error variable in btrfs_del_dir_entries_in_log usb: dwc3: gadget: Don't setup more than requested usb: dwc3: gadget: Fix handling ZLP usb: dwc3: gadget: Handle ZLP for sg requests tpm: Unify the mismatching TPM space buffer sizes HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage() ALSA: usb-audio: Update documentation comment for MS2109 quirk Linux 4.19.143 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I8b6e29eda77bd69df30132842cf28019c8e7c1a3
Greg Kroah-Hartman
commited |
a13ec5ea86 | |
commit 784a0830377d0761834e385975bc46861fea9fa0 upstream.
Most of the CPU mask operations behave the same way, but for_each_cpu() and
it's variants ignore the cpumask argument and claim that CPU0 is always in
the mask. This is historical, inconsistent and annoying behaviour.
The matrix allocator uses for_each_cpu() and can be called on UP with an
empty cpumask. The calling code does not expect that this succeeds but
until commit e027fffff799 ("x86/irq: Unbreak interrupt affinity setting")
this went unnoticed. That commit added a WARN_ON() to catch cases which
move an interrupt from one vector to another on the same CPU. The warning
triggers on UP.
Add a check for the cpumask being empty to prevent this.
Fixes:
Thomas Gleixner
authored and
Greg Kroah-Hartman
commited |
d9eeca1ed8 | |
[ Upstream commit a7ef9b28aa8d72a1656fa6f0a01bbd1493886317 ]
Though the number of lock-acquisitions is tracked as unsigned long, this
is passed as the divisor to div_s64() which interprets it as a s32,
giving nonsense values with more than 2 billion acquisitons. E.g.
acquisitions holdtime-min holdtime-max holdtime-total holdtime-avg
-------------------------------------------------------------------------
2350439395 0.07 353.38 649647067.36 0.-32
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20200725185110.11588-1-chris@chris-wilson.co.uk
Signed-off-by: Sasha Levin <sashal@kernel.org>
Chris Wilson
authored and
Greg Kroah-Hartman
commited |
db454f8ab4 | |
[ Upstream commit b431ef837e3374da0db8ff6683170359aaa0859c ] We make an assumption that a debugfs directory exists, but since this can fail ensure it exists before allowing blktrace setup to complete. Otherwise we end up stuffing blktrace files on the debugfs root directory. In the worst case scenario this *in theory* can create an eventual panic *iff* in the future a similarly named file is created prior on the debugfs root directory. This theoretical crash can happen due to a recursive removal followed by a specific dentry removal. This doesn't fix any known crash, however I have seen the files go into the main debugfs root directory in cases where the debugfs directory was not created due to other internal bugs with blktrace now fixed. blktrace is also completely useless without this directory, so this ensures to userspace we only setup blktrace if the kernel can stuff files where they are supposed to go into. debugfs directory creations typically aren't checked for, and we have maintainers doing sweep removals of these checks, but since we need this check to ensure proper userspace blktrace functionality we make sure to annotate the justification for the check. Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org> 
Luis Chamberlain
authored and
Greg Kroah-Hartman
commited |
f4e8607651 | |
The 'cgrp' is set but not used in commit <76f969e8948d8>
("cgroup: cgroup v2 freezer").
Remove it to avoid [-Wunused-but-set-variable] warning.
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Acked-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
(cherry picked from commit 533307dc20a9e84a0687d4ca24aeb669516c0243)
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
Change-Id: I6221a975c04f06249a4f8d693852776ae08a8d8e
Shaokun Zhang
authored and
 Marco Ballesio
commited |
5ab3ecd497 | |
ptrace_stop() does preempt_enable_no_resched() to avoid the preemption,
but after that cgroup_enter_frozen() does spin_lock/unlock and this adds
another preemption point.
Reported-and-tested-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Fixes: 76f969e8948d ("cgroup: cgroup v2 freezer")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Change-Id: Ic53e0f2d6624b0bb90817b0c57060fb7db971348
(cherry picked from commit 937c6b27c73e02cd4114f95f5c37ba2c29fadba1)
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
Oleg Nesterov
authored and
Marco Ballesio
commited |
caf7caca0b | |
If a new child cgroup is created in the frozen cgroup hierarchy
(one or more of ancestor cgroups is frozen), the CGRP_FREEZE cgroup
flag should be set. Otherwise if a process will be attached to the
child cgroup, it won't become frozen.
The problem can be reproduced with the test_cgfreezer_mkdir test.
This is the output before this patch:
~/test_freezer
ok 1 test_cgfreezer_simple
ok 2 test_cgfreezer_tree
ok 3 test_cgfreezer_forkbomb
Cgroup /sys/fs/cgroup/cg_test_mkdir_A/cg_test_mkdir_B isn't frozen
not ok 4 test_cgfreezer_mkdir
ok 5 test_cgfreezer_rmdir
ok 6 test_cgfreezer_migrate
ok 7 test_cgfreezer_ptrace
ok 8 test_cgfreezer_stopped
ok 9 test_cgfreezer_ptraced
ok 10 test_cgfreezer_vfork
And with this patch:
~/test_freezer
ok 1 test_cgfreezer_simple
ok 2 test_cgfreezer_tree
ok 3 test_cgfreezer_forkbomb
ok 4 test_cgfreezer_mkdir
ok 5 test_cgfreezer_rmdir
ok 6 test_cgfreezer_migrate
ok 7 test_cgfreezer_ptrace
ok 8 test_cgfreezer_stopped
ok 9 test_cgfreezer_ptraced
ok 10 test_cgfreezer_vfork
Reported-by: Mark Crossen <mcrossen@fb.com>
Signed-off-by: Roman Gushchin <guro@fb.com>
Fixes: 76f969e8948d ("cgroup: cgroup v2 freezer")
Cc: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Tejun Heo <tj@kernel.org>
Change-Id: I6ba7b8dec5600e78bb7448f03fd97a9b43838fa0
(cherry picked from commit 97a61369830ab085df5aed0ff9256f35b07d425a)
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
Roman Gushchin
authored and
Marco Ballesio
commited |
fe5770aeda | |
Alex Xu reported a regression in strace, caused by the introduction of
the cgroup v2 freezer. The regression can be reproduced by stracing
the following simple program:
#include <unistd.h>
int main() {
write(1, "a", 1);
return 0;
}
An attempt to run strace ./a.out leads to the infinite loop:
[ pre-main omitted ]
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
write(1, "a", 1) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
[ repeats forever ]
The problem occurs because the traced task leaves ptrace_stop()
(and the signal handling loop) with the frozen bit set. So let's
call cgroup_leave_frozen(true) unconditionally after sleeping
in ptrace_stop().
With this patch applied, strace works as expected:
[ pre-main omitted ]
write(1, "a", 1) = 1
exit_group(0) = ?
+++ exited with 0 +++
Reported-by: Alex Xu <alex_y_xu@yahoo.ca>
Fixes: 76f969e8948d ("cgroup: cgroup v2 freezer")
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Change-Id: If644b15ead36ce13f0c2c3dd57eebe3658e3edf7
(cherry picked from commit 05b289263772b0698589abc47771264a685cd365)
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
Roman Gushchin
authored and
Marco Ballesio
commited |
f7840a0a07 | |
Cgroup v1 implements the freezer controller, which provides an ability
to stop the workload in a cgroup and temporarily free up some
resources (cpu, io, network bandwidth and, potentially, memory)
for some other tasks. Cgroup v2 lacks this functionality.
This patch implements freezer for cgroup v2.
Cgroup v2 freezer tries to put tasks into a state similar to jobctl
stop. This means that tasks can be killed, ptraced (using
PTRACE_SEIZE*), and interrupted. It is possible to attach to
a frozen task, get some information (e.g. read registers) and detach.
It's also possible to migrate a frozen tasks to another cgroup.
This differs cgroup v2 freezer from cgroup v1 freezer, which mostly
tried to imitate the system-wide freezer. However uninterruptible
sleep is fine when all tasks are going to be frozen (hibernation case),
it's not the acceptable state for some subset of the system.
Cgroup v2 freezer is not supporting freezing kthreads.
If a non-root cgroup contains kthread, the cgroup still can be frozen,
but the kthread will remain running, the cgroup will be shown
as non-frozen, and the notification will not be delivered.
* PTRACE_ATTACH is not working because non-fatal signal delivery
is blocked in frozen state.
There are some interface differences between cgroup v1 and cgroup v2
freezer too, which are required to conform the cgroup v2 interface
design principles:
1) There is no separate controller, which has to be turned on:
the functionality is always available and is represented by
cgroup.freeze and cgroup.events cgroup control files.
2) The desired state is defined by the cgroup.freeze control file.
Any hierarchical configuration is allowed.
3) The interface is asynchronous. The actual state is available
using cgroup.events control file ("frozen" field). There are no
dedicated transitional states.
4) It's allowed to make any changes with the cgroup hierarchy
(create new cgroups, remove old cgroups, move tasks between cgroups)
no matter if some cgroups are frozen.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
No-objection-from-me-by: Oleg Nesterov <oleg@redhat.com>
Cc: kernel-team@fb.com
Change-Id: I3404119678cbcd7410aa56e9334055cee79d02fa
(cherry picked from commit 76f969e8948d82e78e1bc4beb6b9465908e74873)
cgroup-defs.h: use the struct cgroup_freezer_state and the
freezer field from definitions in I6221a975c04f06249a4f8d693852776ae08a8d8e
sched.h: use the frozen field defined in
I6221a975c04f06249a4f8d693852776ae08a8d8e
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
Roman Gushchin
authored and
Marco Ballesio
commited |
5318f3163c | |
The helper is identical to the existing cgroup_task_count() except it doesn't take the css_set_lock by itself, assuming that the caller does. Also, move cgroup_task_count() implementation into kernel/cgroup/cgroup.c, as there is nothing specific to cgroup v1. Signed-off-by: Roman Gushchin <guro@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: kernel-team@fb.com Change-Id: Iaa9085d2375d395a051543d2555389213c2892d6 (cherry picked from commit aade7f9efba098859681f8e88d81a5b44ad09b12) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com>
Roman Gushchin
authored and
Marco Ballesio
commited |
2d4721389f | |
Freezer.c will contain an implementation of cgroup v2 freezer, so let's rename the v1 freezer to avoid naming conflicts. Signed-off-by: Roman Gushchin <guro@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: kernel-team@fb.com (cherry picked from commit 50943f3e136adfc421f9768d6ae09ba7b83aaefd) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com> Change-Id: I7fa1223c841ee70a0c93fa9cc1ca51a63f53d457
Roman Gushchin
authored and
Marco Ballesio
commited |
279c82022c | |
The callers of cgroup_migrate_prepare_dst() correctly call cgroup_migrate_finish() for success and failure cases both. No need to call it in cgroup_migrate_prepare_dst() in failure case. Signed-off-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by: Tejun Heo <tj@kernel.org> Change-Id: I785d7ab70a42b1b79aea9852bb14ba5abefcaa9b (cherry picked from commit d6e486ee0ef2f99a4069d9186e53dac61b28cb3c) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com> 
Shakeel Butt
authored and
Marco Ballesio
commited |
1dea25023f | |
* make the reference from superblock to cgroup_root counting - do cgroup_put() in cgroup_kill_sb() whether we'd done percpu_ref_kill() or not; matching grab is done when we allocate a new root. That gives the same refcounting rules for all callers of cgroup_do_mount() - a reference to cgroup_root has been grabbed by caller and it either is transferred to new superblock or dropped. * have cgroup_kill_sb() treat an already killed refcount as "just don't bother killing it, then". * after successful cgroup_do_mount() have cgroup1_mount() recheck if we'd raced with mount/umount from somebody else and cgroup_root got killed. In that case we drop the superblock and bugger off with -ERESTARTSYS, same as if we'd found it in the list already dying. * don't bother with delayed initialization of refcount - it's unreliable and not needed. No need to prevent attempts to bump the refcount if we find cgroup_root of another mount in progress - sget will reuse an existing superblock just fine and if the other sb manages to die before we get there, we'll catch that immediately after cgroup_do_mount(). * don't bother with kernfs_pin_sb() - no need for doing that either. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Change-Id: I8e088dfc516b76c42d9d4b34db7f49f0cebc5414 (cherry picked from commit 35ac1184244f1329783e1d897f74926d8bb1103a) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com> 
Al Viro
authored and
Marco Ballesio
commited |
8e0f48a73d | |
It can be useful to inhibit all cgroup1 hierarchies especially during transition and for debugging. cgroup_no_v1 can block hierarchies with controllers which leaves out the named hierarchies. Expand it to cover the named hierarchies so that "cgroup_no_v1=all,named" disables all cgroup1 hierarchies. Signed-off-by: Tejun Heo <tj@kernel.org> Suggested-by: Marcin Pawlowski <mpawlowski@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Change-Id: Ibd093dd9b70d15402a21db3c1ef56005ebc7f99e (cherry picked from commit 3fc9c12d27b4ded4f1f761a800558dab2e6bbac5) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com> 
Tejun Heo
authored and
Marco Ballesio
commited |
ce5f91bdfa | |
WARN_ON() already contains an unlikely(), so it's not necessary to use unlikely. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Change-Id: I092c0aae2a06b13d3fc9ecfbb24ab3e8d10235f6 (cherry picked from commit 4d9ebbe2b061a9c25e12ba8539ba172533132eb6) Bug: 154548692 Signed-off-by: Marco Ballesio <balejs@google.com> 
Yangtao Li
authored and
Marco Ballesio
commited |
0d53c30064 | |
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Merge 4.19.142 into android-4.19-stable
Changes in 4.19.142
drm/vgem: Replace opencoded version of drm_gem_dumb_map_offset()
perf probe: Fix memory leakage when the probe point is not found
khugepaged: khugepaged_test_exit() check mmget_still_valid()
khugepaged: adjust VM_BUG_ON_MM() in __khugepaged_enter()
btrfs: export helpers for subvolume name/id resolution
btrfs: don't show full path of bind mounts in subvol=
btrfs: Move free_pages_out label in inline extent handling branch in compress_file_range
btrfs: inode: fix NULL pointer dereference if inode doesn't need compression
btrfs: sysfs: use NOFS for device creation
romfs: fix uninitialized memory leak in romfs_dev_read()
kernel/relay.c: fix memleak on destroy relay channel
mm: include CMA pages in lowmem_reserve at boot
mm, page_alloc: fix core hung in free_pcppages_bulk()
ext4: fix checking of directory entry validity for inline directories
jbd2: add the missing unlock_buffer() in the error path of jbd2_write_superblock()
scsi: zfcp: Fix use-after-free in request timeout handlers
drm/amd/display: fix pow() crashing when given base 0
kthread: Do not preempt current task if it is going to call schedule()
spi: Prevent adding devices below an unregistering controller
scsi: ufs: Add DELAY_BEFORE_LPM quirk for Micron devices
scsi: target: tcmu: Fix crash in tcmu_flush_dcache_range on ARM
media: budget-core: Improve exception handling in budget_register()
rtc: goldfish: Enable interrupt in set_alarm() when necessary
media: vpss: clean up resources in init
Input: psmouse - add a newline when printing 'proto' by sysfs
m68knommu: fix overwriting of bits in ColdFire V3 cache control
svcrdma: Fix another Receive buffer leak
xfs: fix inode quota reservation checks
jffs2: fix UAF problem
ceph: fix use-after-free for fsc->mdsc
cpufreq: intel_pstate: Fix cpuinfo_max_freq when MSR_TURBO_RATIO_LIMIT is 0
scsi: libfc: Free skb in fc_disc_gpn_id_resp() for valid cases
virtio_ring: Avoid loop when vq is broken in virtqueue_poll
tools/testing/selftests/cgroup/cgroup_util.c: cg_read_strcmp: fix null pointer dereference
xfs: Fix UBSAN null-ptr-deref in xfs_sysfs_init
alpha: fix annotation of io{read,write}{16,32}be()
fs/signalfd.c: fix inconsistent return codes for signalfd4
ext4: fix potential negative array index in do_split()
ext4: don't allow overlapping system zones
ASoC: q6routing: add dummy register read/write function
i40e: Set RX_ONLY mode for unicast promiscuous on VLAN
i40e: Fix crash during removing i40e driver
net: fec: correct the error path for regulator disable in probe
bonding: show saner speed for broadcast mode
bonding: fix a potential double-unregister
s390/runtime_instrumentation: fix storage key handling
s390/ptrace: fix storage key handling
ASoC: msm8916-wcd-analog: fix register Interrupt offset
ASoC: intel: Fix memleak in sst_media_open
vfio/type1: Add proper error unwind for vfio_iommu_replay()
kvm: x86: Toggling CR4.SMAP does not load PDPTEs in PAE mode
kvm: x86: Toggling CR4.PKE does not load PDPTEs in PAE mode
kconfig: qconf: do not limit the pop-up menu to the first row
kconfig: qconf: fix signal connection to invalid slots
efi: avoid error message when booting under Xen
Fix build error when CONFIG_ACPI is not set/enabled:
RDMA/bnxt_re: Do not add user qps to flushlist
afs: Fix NULL deref in afs_dynroot_depopulate()
bonding: fix active-backup failover for current ARP slave
net: ena: Prevent reset after device destruction
net: gemini: Fix missing free_netdev() in error path of gemini_ethernet_port_probe()
hv_netvsc: Fix the queue_mapping in netvsc_vf_xmit()
net: dsa: b53: check for timeout
powerpc/pseries: Do not initiate shutdown when system is running on UPS
efi: add missed destroy_workqueue when efisubsys_init fails
epoll: Keep a reference on files added to the check list
do_epoll_ctl(): clean the failure exits up a bit
mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible
xen: don't reschedule in preemption off sections
clk: Evict unregistered clks from parent caches
KVM: Pass MMU notifier range flags to kvm_unmap_hva_range()
KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set
Linux 4.19.142
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ibfe4a0a4249f76ab35076f4b003e32cd6f9788a5
Greg Kroah-Hartman
commited |
599bf02de4 | |
commit 26c7295be0c5e6da3fa45970e9748be983175b1b upstream.
when we create a kthread with ktrhead_create_on_cpu(),the child thread
entry is ktread.c:ktrhead() which will be preempted by the parent after
call complete(done) while schedule() is not called yet,then the parent
will call wait_task_inactive(child) but the child is still on the runqueue,
so the parent will schedule_hrtimeout() for 1 jiffy,it will waste a lot of
time,especially on startup.
parent child
ktrhead_create_on_cpu()
wait_fo_completion(&done) -----> ktread.c:ktrhead()
|----- complete(done);--wakeup and preempted by parent
kthread_bind() <------------| |-> schedule();--dequeue here
wait_task_inactive(child) |
schedule_hrtimeout(1 jiffy) -|
So we hope the child just wakeup parent but not preempted by parent, and the
child is going to call schedule() soon,then the parent will not call
schedule_hrtimeout(1 jiffy) as the child is already dequeue.
The same issue for ktrhead_park()&&kthread_parkme().
This patch can save 120ms on rk312x startup with CONFIG_HZ=300.
Signed-off-by: Liang Chen <cl@rock-chips.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lkml.kernel.org/r/20200306070133.18335-2-cl@rock-chips.com
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Liang Chen
authored and
Greg Kroah-Hartman
commited |
1c263d0e54 | |
commit 71e843295c680898959b22dc877ae3839cc22470 upstream.
kmemleak report memory leak as follows:
unreferenced object 0x607ee4e5f948 (size 8):
comm "syz-executor.1", pid 2098, jiffies 4295031601 (age 288.468s)
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00 ........
backtrace:
relay_open kernel/relay.c:583 [inline]
relay_open+0xb6/0x970 kernel/relay.c:563
do_blk_trace_setup+0x4a8/0xb20 kernel/trace/blktrace.c:557
__blk_trace_setup+0xb6/0x150 kernel/trace/blktrace.c:597
blk_trace_ioctl+0x146/0x280 kernel/trace/blktrace.c:738
blkdev_ioctl+0xb2/0x6a0 block/ioctl.c:613
block_ioctl+0xe5/0x120 fs/block_dev.c:1871
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x170/0x1ce fs/ioctl.c:739
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
'chan->buf' is malloced in relay_open() by alloc_percpu() but not free
while destroy the relay channel. Fix it by adding free_percpu() before
return from relay_destroy_channel().
Fixes:
Wei Yongjun
authored and
Greg Kroah-Hartman
commited |
3a54b901fd | |
-----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEZH8oZUiU471FcZm+ONu9yGCSaT4FAl8/jnoACgkQONu9yGCS aT54fA//azItNUOsY1HujeNfINHWCqCLV7OHpdxa9MEeixSpP/ufsGcgyZBTslNw WOENkdUPGYxUQt9yyZjSY5CEneH6a007idCfUWIuHRZ9nxKbDZm312xDDcDkeZI7 P4TGvIdpDq7Czk2c+OCSUnmp/+fCJdPCpCYJZp0kBDVbUsKeUwpBJ42Dca8f/2iM lWVlGR2KwMIV+NSVArpu8EUOpw7X4rPsGz72kEvVhCkcXa9GFxGbs65AVNG5NTzt 9sHBlja7PZTqt844/6UBM5EgTR43uJT5z8sSV5N5s6j2d07m/T+2f73PyKqr6+jQ SXKpIp/J6Po7tCej5u4B9LO+ePpasuxbNAXmn1GLuiP7qzKRAriFxK2RfXXxqIuE aP9DB6P/wbr/MszFjIFFg9nrr9G/biriRNPWtnzD2hbUk1mfM8WNCCSIt90MZh0f CT85JiEBFlU5cZhgUJfqJcfZcckE8gbdUGOBvZ5NOq0hxqN2S6+/phespwkd4h/a A4QyhER6eI9zT/StBoSLejs8c/lHKHjqyMARNjXLPF+bkkR90L9WDgocB1KiV0jn YOY+j4tjXGnn/QAsuW/uhYVvzETtkQ5oSyeV5uTcgYvU3iw+QFo9H//y83yB5Q0o pdDRNmMTtdYwrwkzt73xsjKGlVXaA8kB5kRCuBwGb5kzr0G8baE= =Txdz -----END PGP SIGNATURE----- Merge 4.19.141 into android-4.19-stable Changes in 4.19.141 smb3: warn on confusing error scenario with sec=krb5 genirq/affinity: Make affinity setting if activated opt-in PCI: hotplug: ACPI: Fix context refcounting in acpiphp_grab_context() PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken PCI: Add device even if driver attach failed PCI: qcom: Define some PARF params needed for ipq8064 SoC PCI: qcom: Add support for tx term offset for rev 2.1.0 PCI: Probe bridge window attributes once at enumeration-time btrfs: free anon block device right after subvolume deletion btrfs: don't allocate anonymous block device for user invisible roots btrfs: ref-verify: fix memory leak in add_block_entry btrfs: don't traverse into the seed devices in show_devname btrfs: open device without device_list_mutex btrfs: fix messages after changing compression level by remount btrfs: only search for left_info if there is no right_info in try_merge_free_space btrfs: fix memory leaks after failure to lookup checksums during inode logging btrfs: fix return value mixup in btrfs_get_extent dt-bindings: iio: io-channel-mux: Fix compatible string in example code iio: dac: ad5592r: fix unbalanced mutex unlocks in ad5592r_read_raw() xtensa: fix xtensa_pmu_setup prototype cifs: Fix leak when handling lease break for cached root fid powerpc: Allow 4224 bytes of stack expansion for the signal frame powerpc: Fix circular dependency between percpu.h and mmu.h media: vsp1: dl: Fix NULL pointer dereference on unbind net: ethernet: stmmac: Disable hardware multicast filter net: stmmac: dwmac1000: provide multicast filter fallback net/compat: Add missing sock updates for SCM_RIGHTS md/raid5: Fix Force reconstruct-write io stuck in degraded raid5 bcache: allocate meta data pages as compound pages bcache: fix overflow in offset_to_stripe() mac80211: fix misplaced while instead of if driver core: Avoid binding drivers to dead devices MIPS: CPU#0 is not hotpluggable ext2: fix missing percpu_counter_inc ocfs2: change slot number type s16 to u16 mm/page_counter.c: fix protection usage propagation ftrace: Setup correct FTRACE_FL_REGS flags for module kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler tracing/hwlat: Honor the tracing_cpumask tracing: Use trace_sched_process_free() instead of exit() for pid tracing watchdog: f71808e_wdt: indicate WDIOF_CARDRESET support in watchdog_info.options watchdog: f71808e_wdt: remove use of wrong watchdog_info option watchdog: f71808e_wdt: clear watchdog timeout occurred flag pseries: Fix 64 bit logical memory block panic module: Correctly truncate sysfs sections output perf intel-pt: Fix FUP packet state remoteproc: qcom: q6v5: Update running state before requesting stop drm/imx: imx-ldb: Disable both channels for split mode in enc->disable() mfd: arizona: Ensure 32k clock is put on driver unbind and error RDMA/ipoib: Return void from ipoib_ib_dev_stop() RDMA/ipoib: Fix ABBA deadlock with ipoib_reap_ah() media: rockchip: rga: Introduce color fmt macros and refactor CSC mode logic media: rockchip: rga: Only set output CSC mode for RGB input USB: serial: ftdi_sio: make process-packet buffer unsigned USB: serial: ftdi_sio: clean up receive processing mmc: renesas_sdhi_internal_dmac: clean up the code for dma complete gpu: ipu-v3: image-convert: Combine rotate/no-rotate irq handlers dm rq: don't call blk_mq_queue_stopped() in dm_stop_queue() selftests/powerpc: ptrace-pkey: Rename variables to make it easier to follow code selftests/powerpc: ptrace-pkey: Update the test to mark an invalid pkey correctly selftests/powerpc: ptrace-pkey: Don't update expected UAMOR value iommu/omap: Check for failure of a call to omap_iommu_dump_ctx iommu/vt-d: Enforce PASID devTLB field mask i2c: rcar: slave: only send STOP event when we have been addressed clk: clk-atlas6: fix return value check in atlas6_clk_init() pwm: bcm-iproc: handle clk_get_rate() return tools build feature: Use CC and CXX from parent i2c: rcar: avoid race when unregistering slave openrisc: Fix oops caused when dumping stack scsi: lpfc: nvmet: Avoid hang / use-after-free again when destroying targetport watchdog: initialize device before misc_register Input: sentelic - fix error return when fsp_reg_write fails drm/vmwgfx: Use correct vmw_legacy_display_unit pointer drm/vmwgfx: Fix two list_for_each loop exit tests net: qcom/emac: add missed clk_disable_unprepare in error path of emac_clks_phase1_init nfs: Fix getxattr kernel panic and memory overflow fs/minix: set s_maxbytes correctly fs/minix: fix block limit check for V1 filesystems fs/minix: remove expected error message in block_to_path() fs/ufs: avoid potential u32 multiplication overflow test_kmod: avoid potential double free in trigger_config_run_type() mfd: dln2: Run event handler loop under spinlock ALSA: echoaudio: Fix potential Oops in snd_echo_resume() perf bench mem: Always memset source before memcpy tools build feature: Quote CC and CXX for their arguments sh: landisk: Add missing initialization of sh_io_port_base khugepaged: retract_page_tables() remember to test exit arm64: dts: marvell: espressobin: add ethernet alias drm: Added orientation quirk for ASUS tablet model T103HAF drm/amdgpu: Fix bug where DPM is not enabled after hibernate and resume Linux 4.19.141 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I0800f8e03919fd8f054c1bcda87efd70a6e5db6b
Greg Kroah-Hartman
commited |
369c9d2963 | |
commit 11990a5bd7e558e9203c1070fc52fb6f0488e75b upstream. The only-root-readable /sys/module/$module/sections/$section files did not truncate their output to the available buffer size. While most paths into the kernfs read handlers end up using PAGE_SIZE buffers, it's possible to get there through other paths (e.g. splice, sendfile). Actually limit the output to the "count" passed into the read function, and report it back correctly. *sigh* Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/lkml/20200805002015.GE23458@shao2-debian Fixes: ed66f991bb19 ("module: Refactor section attr into bin attribute") Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Jessica Yu <jeyu@kernel.org> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Kees Cook
authored and
Greg Kroah-Hartman
commited |
cec9fbfe39 | |
commit afcab636657421f7ebfa0783a91f90256bba0091 upstream. On exit, if a process is preempted after the trace_sched_process_exit() tracepoint but before the process is done exiting, then when it gets scheduled in, the function tracers will not filter it properly against the function tracing pid filters. That is because the function tracing pid filters hooks to the sched_process_exit() tracepoint to remove the exiting task's pid from the filter list. Because the filtering happens at the sched_switch tracepoint, when the exiting task schedules back in to finish up the exit, it will no longer be in the function pid filtering tables. This was noticeable in the notrace self tests on a preemptable kernel, as the tests would fail as it exits and preempted after being taken off the notrace filter table and on scheduling back in it would not be in the notrace list, and then the ending of the exit function would trace. The test detected this and would fail. Cc: stable@vger.kernel.org Cc: Namhyung Kim <namhyung@kernel.org> Fixes: 
Steven Rostedt (VMware)
authored and
Greg Kroah-Hartman
commited |
2c98c4a0c3 | |
commit 96b4833b6827a62c295b149213c68b559514c929 upstream.
In calculation of the cpu mask for the hwlat kernel thread, the wrong
cpu mask is used instead of the tracing_cpumask, this causes the
tracing/tracing_cpumask useless for hwlat tracer. Fixes it.
Link: https://lkml.kernel.org/r/20200730082318.42584-2-haokexin@gmail.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: stable@vger.kernel.org
Fixes:
Kevin Hao
authored and
Greg Kroah-Hartman
commited |
b3b77736dd | |
commit 0cb2f1372baa60af8456388a574af6133edd7d80 upstream.
We found a case of kernel panic on our server. The stack trace is as
follows(omit some irrelevant information):
BUG: kernel NULL pointer dereference, address: 0000000000000080
RIP: 0010:kprobe_ftrace_handler+0x5e/0xe0
RSP: 0018:ffffb512c6550998 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8e9d16eea018 RCX: 0000000000000000
RDX: ffffffffbe1179c0 RSI: ffffffffc0535564 RDI: ffffffffc0534ec0
RBP: ffffffffc0534ec1 R08: ffff8e9d1bbb0f00 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8e9d1f797060 R14: 000000000000bacc R15: ffff8e9ce13eca00
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000008453d0005 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
ftrace_ops_assist_func+0x56/0xe0
ftrace_call+0x5/0x34
tcpa_statistic_send+0x5/0x130 [ttcp_engine]
The tcpa_statistic_send is the function being kprobed. After analysis,
the root cause is that the fourth parameter regs of kprobe_ftrace_handler
is NULL. Why regs is NULL? We use the crash tool to analyze the kdump.
crash> dis tcpa_statistic_send -r
<tcpa_statistic_send>: callq 0xffffffffbd8018c0 <ftrace_caller>
The tcpa_statistic_send calls ftrace_caller instead of ftrace_regs_caller.
So it is reasonable that the fourth parameter regs of kprobe_ftrace_handler
is NULL. In theory, we should call the ftrace_regs_caller instead of the
ftrace_caller. After in-depth analysis, we found a reproducible path.
Writing a simple kernel module which starts a periodic timer. The
timer's handler is named 'kprobe_test_timer_handler'. The module
name is kprobe_test.ko.
1) insmod kprobe_test.ko
2) bpftrace -e 'kretprobe:kprobe_test_timer_handler {}'
3) echo 0 > /proc/sys/kernel/ftrace_enabled
4) rmmod kprobe_test
5) stop step 2) kprobe
6) insmod kprobe_test.ko
7) bpftrace -e 'kretprobe:kprobe_test_timer_handler {}'
We mark the kprobe as GONE but not disarm the kprobe in the step 4).
The step 5) also do not disarm the kprobe when unregister kprobe. So
we do not remove the ip from the filter. In this case, when the module
loads again in the step 6), we will replace the code to ftrace_caller
via the ftrace_module_enable(). When we register kprobe again, we will
not replace ftrace_caller to ftrace_regs_caller because the ftrace is
disabled in the step 3). So the step 7) will trigger kernel panic. Fix
this problem by disarming the kprobe when the module is going away.
Link: https://lkml.kernel.org/r/20200728064536.24405-1-songmuchun@bytedance.com
Cc: stable@vger.kernel.org
Fixes:
Muchun Song
authored and
Greg Kroah-Hartman
commited |
46c9d3925a | |
commit 8a224ffb3f52b0027f6b7279854c71a31c48fc97 upstream.
When module loaded and enabled, we will use __ftrace_replace_code
for module if any ftrace_ops referenced it found. But we will get
wrong ftrace_addr for module rec in ftrace_get_addr_new, because
rec->flags has not been setup correctly. It can cause the callback
function of a ftrace_ops has FTRACE_OPS_FL_SAVE_REGS to be called
with pt_regs set to NULL.
So setup correct FTRACE_FL_REGS flags for rec when we call
referenced_filters to find ftrace_ops references it.
Link: https://lkml.kernel.org/r/20200728180554.65203-1-zhouchengming@bytedance.com
Cc: stable@vger.kernel.org
Fixes:
Chengming Zhou
authored and
Greg Kroah-Hartman
commited |
892fd3637a | |
commit f0c7baca180046824e07fc5f1326e83a8fd150c7 upstream.
John reported that on a RK3288 system the perf per CPU interrupts are all
affine to CPU0 and provided the analysis:
"It looks like what happens is that because the interrupts are not per-CPU
in the hardware, armpmu_request_irq() calls irq_force_affinity() while
the interrupt is deactivated and then request_irq() with IRQF_PERCPU |
IRQF_NOBALANCING.
Now when irq_startup() runs with IRQ_STARTUP_NORMAL, it calls
irq_setup_affinity() which returns early because IRQF_PERCPU and
IRQF_NOBALANCING are set, leaving the interrupt on its original CPU."
This was broken by the recent commit which blocked interrupt affinity
setting in hardware before activation of the interrupt. While this works in
general, it does not work for this particular case. As contrary to the
initial analysis not all interrupt chip drivers implement an activate
callback, the safe cure is to make the deferred interrupt affinity setting
at activation time opt-in.
Implement the necessary core logic and make the two irqchip implementations
for which this is required opt-in. In hindsight this would have been the
right thing to do, but ...
Fixes: baedb87d1b53 ("genirq/affinity: Handle affinity setting on inactive interrupts correctly")
Reported-by: John Keeping <john@metanate.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/87blk4tzgm.fsf@nanos.tec.linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Thomas Gleixner
authored and
Greg Kroah-Hartman
commited |
5c4d9eefd3 | |
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report cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone() x86/mce/inject: Fix a wrong assignment of i_mce.status sched/fair: Fix NOHZ next idle balance sched: correct SD_flags returned by tl->sd_flags() arm64: dts: rockchip: fix rk3368-lion gmac reset gpio arm64: dts: rockchip: fix rk3399-puma vcc5v0-host gpio arm64: dts: rockchip: fix rk3399-puma gmac reset gpio EDAC: Fix reference count leaks arm64: dts: qcom: msm8916: Replace invalid bias-pull-none property crypto: ccree - fix resource leak on error path firmware: arm_scmi: Fix SCMI genpd domain probing arm64: dts: exynos: Fix silent hang after boot on Espresso clk: scmi: Fix min and max rate when registering clocks with discrete rates m68k: mac: Don't send IOP message until channel is idle m68k: mac: Fix IOP status/control register writes platform/x86: intel-hid: Fix return value check in check_acpi_dev() platform/x86: intel-vbtn: Fix return value check in check_acpi_dev() ARM: dts: gose: Fix ports node name for adv7180 ARM: dts: gose: Fix ports node name for adv7612 ARM: at91: pm: add missing put_device() call in at91_pm_sram_init() spi: lantiq: fix: Rx overflow error in full duplex mode ARM: socfpga: PM: add missing put_device() call in socfpga_setup_ocram_self_refresh() drm/tilcdc: fix leak & null ref in panel_connector_get_modes soc: qcom: rpmh-rsc: Set suppress_bind_attrs flag Bluetooth: add a mutex lock to avoid UAF in do_enale_set loop: be paranoid on exit and prevent new additions / removals fs/btrfs: Add cond_resched() for try_release_extent_mapping() stalls drm/amdgpu: avoid dereferencing a NULL pointer drm/radeon: Fix reference count leaks caused by pm_runtime_get_sync crypto: aesni - Fix build with LLVM_IAS=1 video: fbdev: neofb: fix memory leak in neo_scan_monitor() md-cluster: fix wild pointer of unlock_all_bitmaps() arm64: dts: hisilicon: hikey: fixes to comply with adi, adv7533 DT binding drm/etnaviv: fix ref count leak via pm_runtime_get_sync drm/nouveau: fix multiple instances of reference count leaks usb: mtu3: clear dual mode of u3port when disable device drm/debugfs: fix plain echo to connector "force" attribute drm/radeon: disable AGP by default irqchip/irq-mtk-sysirq: Replace spinlock with raw_spinlock mm/mmap.c: Add cond_resched() for exit_mmap() CPU stalls brcmfmac: keep SDIO watchdog running when console_interval is non-zero brcmfmac: To fix Bss Info flag definition Bug brcmfmac: set state of hanger slot to FREE when flushing PSQ iwlegacy: Check the return value of pcie_capability_read_*() gpu: host1x: debug: Fix multiple channels emitting messages simultaneously usb: gadget: net2280: fix memory leak on probe error handling paths bdc: Fix bug causing crash after multiple disconnects usb: bdc: Halt controller on suspend dyndbg: fix a BUG_ON in ddebug_describe_flags bcache: fix super block seq numbers comparision in register_cache_set() ACPICA: Do not increment operation_region reference counts for field units drm/msm: ratelimit crtc event overflow error agp/intel: Fix a memory leak on module initialisation failure video: fbdev: sm712fb: fix an issue about iounmap for a wrong address console: newport_con: fix an issue about leak related system resources video: pxafb: Fix the function used to balance a 'dma_alloc_coherent()' call ath10k: Acquire tx_lock in tx error paths iio: improve IIO_CONCENTRATION channel type description drm/etnaviv: Fix error path on failure to enable bus clk drm/arm: fix unintentional integer overflow on left shift leds: lm355x: avoid enum conversion warning media: omap3isp: Add missed v4l2_ctrl_handler_free() for preview_init_entities() ASoC: Intel: bxt_rt298: add missing .owner field scsi: cumana_2: Fix different dev_id between request_irq() and free_irq() drm/mipi: use dcs write for mipi_dsi_dcs_set_tear_scanline cxl: Fix kobject memleak drm/radeon: fix array out-of-bounds read and write issues scsi: powertec: Fix different dev_id between request_irq() and free_irq() scsi: eesox: Fix different dev_id between request_irq() and free_irq() ipvs: allow connection reuse for unconfirmed conntrack media: firewire: Using uninitialized values in node_probe() media: exynos4-is: Add missed check for pinctrl_lookup_state() xfs: don't eat an EIO/ENOSPC writeback error when scrubbing data fork xfs: fix reflink quota reservation accounting error RDMA/rxe: Skip dgid check in loopback mode PCI: Fix pci_cfg_wait queue locking problem leds: core: Flush scheduled work for system suspend drm: panel: simple: Fix bpc for LG LB070WV8 panel phy: exynos5-usbdrd: Calibrating makes sense only for USB2.0 PHY drm/bridge: sil_sii8620: initialize return of sii8620_readb scsi: scsi_debug: Add check for sdebug_max_queue during module init mwifiex: Prevent memory corruption handling keys powerpc/vdso: Fix vdso cpu truncation RDMA/qedr: SRQ's bug fixes RDMA/rxe: Prevent access to wr->next ptr afrer wr is posted to send queue staging: rtl8192u: fix a dubious looking mask before a shift PCI/ASPM: Add missing newline in sysfs 'policy' powerpc/book3s64/pkeys: Use PVR check instead of cpu feature drm/imx: tve: fix regulator_disable error path USB: serial: iuu_phoenix: fix led-activity helpers usb: core: fix quirks_param_set() writing to a const pointer thermal: ti-soc-thermal: Fix reversed condition in ti_thermal_expose_sensor() coresight: tmc: Fix TMC mode read in tmc_read_unprepare_etb() MIPS: OCTEON: add missing put_device() call in dwc3_octeon_device_init() usb: dwc2: Fix error path in gadget registration scsi: mesh: Fix panic after host or bus reset net: dsa: mv88e6xxx: MV88E6097 does not support jumbo configuration PCI: cadence: Fix updating Vendor ID and Subsystem Vendor ID register RDMA/core: Fix return error value in _ib_modify_qp() to negative Smack: fix another vsscanf out of bounds Smack: prevent underflow in smk_set_cipso() power: supply: check if calc_soc succeeded in pm860x_init_battery Bluetooth: hci_h5: Set HCI_UART_RESET_ON_INIT to correct flags Bluetooth: hci_serdev: Only unregister device if it was registered net: dsa: rtl8366: Fix VLAN semantics net: dsa: rtl8366: Fix VLAN set-up powerpc/boot: Fix CONFIG_PPC_MPC52XX references selftests/powerpc: Fix CPU affinity for child process PCI: Release IVRS table in AMD ACS quirk selftests/powerpc: Fix online CPU selection ASoC: meson: axg-tdm-interface: fix link fmt setup s390/qeth: don't process empty bridge port events wl1251: fix always return 0 error tools, build: Propagate build failures from tools/build/Makefile.build net: ethernet: aquantia: Fix wrong return value liquidio: Fix wrong return value in cn23xx_get_pf_num() net: spider_net: Fix the size used in a 'dma_free_coherent()' call fsl/fman: use 32-bit unsigned integer fsl/fman: fix dereference null return value fsl/fman: fix unreachable code fsl/fman: check dereferencing null pointer fsl/fman: fix eth hash table allocation dlm: Fix kobject memleak ocfs2: fix unbalanced locking pinctrl-single: fix pcs_parse_pinconf() return value svcrdma: Fix page leak in svc_rdma_recv_read_chunk() x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task crypto: aesni - add compatibility with IAS af_packet: TPACKET_V3: fix fill status rwlock imbalance drivers/net/wan/lapbether: Added needed_headroom and a skb->len check net/nfc/rawsock.c: add CAP_NET_RAW check. net: Set fput_needed iff FDPUT_FPUT is set net/tls: Fix kmap usage net: refactor bind_bucket fastreuse into helper net: initialize fastreuse on inet_inherit_port USB: serial: cp210x: re-enable auto-RTS on open USB: serial: cp210x: enable usb generic throttle/unthrottle ALSA: hda - fix the micmute led status for Lenovo ThinkCentre AIO ALSA: usb-audio: Creative USB X-Fi Pro SB1095 volume knob support ALSA: usb-audio: fix overeager device match for MacroSilicon MS2109 ALSA: usb-audio: work around streaming quirk for MacroSilicon MS2109 pstore: Fix linking when crypto API disabled crypto: hisilicon - don't sleep of CRYPTO_TFM_REQ_MAY_SLEEP was not specified crypto: qat - fix double free in qat_uclo_create_batch_init_list crypto: ccp - Fix use of merged scatterlists crypto: cpt - don't sleep of CRYPTO_TFM_REQ_MAY_SLEEP was not specified bitfield.h: don't compile-time validate _val in FIELD_FIT fs/minix: check return value of sb_getblk() fs/minix: don't allow getting deleted inodes fs/minix: reject too-large maximum file size ALSA: usb-audio: add quirk for Pioneer DDJ-RB 9p: Fix memory leak in v9fs_mount drm/ttm/nouveau: don't call tt destroy callback on alloc failure. NFS: Don't move layouts to plh_return_segs list while in use NFS: Don't return layout segments that are in use cpufreq: dt: fix oops on armada37xx include/asm-generic/vmlinux.lds.h: align ro_after_init spi: spidev: Align buffers for DMA mtd: rawnand: qcom: avoid write to unavailable register parisc: Implement __smp_store_release and __smp_load_acquire barriers parisc: mask out enable and reserved bits from sba imask ARM: 8992/1: Fix unwind_frame for clang-built kernels irqdomain/treewide: Free firmware node after domain removal xen/balloon: fix accounting in alloc_xenballooned_pages error path xen/balloon: make the balloon wait interruptible xen/gntdev: Fix dmabuf import with non-zero sgt offset Linux 4.19.140 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I6b0d8dcf9ded022f62d9c62605388f1c1e9112d1
Greg Kroah-Hartman
commited |
7086849b9c | |
[ Upstream commit 9b1b234bb86bcdcdb142e900d39b599185465dbb ]
During sched domain init, we check whether non-topological SD_flags are
returned by tl->sd_flags(), if found, fire a waning and correct the
violation, but the code failed to correct the violation. Correct this.
Fixes:
Peng Liu
authored and
Greg Kroah-Hartman
commited |
008560eb23 | |
[ Upstream commit 3ea2f097b17e13a8280f1f9386c331b326a3dbef ] With commit: ' 
Vincent Guittot
authored and
Greg Kroah-Hartman
commited |
519252e38c | |
Add skcd->no_refcnt check which is missed when backporting
ad0f75e5f57c ("cgroup: fix cgroup_sk_alloc() for sk_clone_lock()").
This patch is needed in stable-4.9, stable-4.14 and stable-4.19.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Yang Yingliang
authored and
Greg Kroah-Hartman
commited |
38de4308c5 | |
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Greg Kroah-Hartman
commited |
3b375fecae | |
commit f227e3ec3b5cad859ad15666874405e8c1bbc1d4 upstream. This modifies the first 32 bits out of the 128 bits of a random CPU's net_rand_state on interrupt or CPU activity to complicate remote observations that could lead to guessing the network RNG's internal state. Note that depending on some network devices' interrupt rate moderation or binding, this re-seeding might happen on every packet or even almost never. In addition, with NOHZ some CPUs might not even get timer interrupts, leaving their local state rarely updated, while they are running networked processes making use of the random state. For this reason, we also perform this update in update_process_times() in order to at least update the state when there is user or system activity, since it's the only case we care about. Reported-by: Amit Klein <aksecurity@gmail.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Eric Dumazet <edumazet@google.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Willy Tarreau
authored and
Greg Kroah-Hartman
commited |
29204c8468 | |
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Greg Kroah-Hartman
commited |
a5218b3636 | |
[ Upstream commit 1d4e1eab456e1ee92a94987499b211db05f900ea ]
Fix HASH_OF_MAPS bug of not putting inner map pointer on bpf_map_elem_update()
operation. This is due to per-cpu extra_elems optimization, which bypassed
free_htab_elem() logic doing proper clean ups. Make sure that inner map is put
properly in optimized case as well.
Fixes:
Andrii Nakryiko
authored and
Greg Kroah-Hartman
commited |
634d42cadc | |
[ Upstream commit 96c5c6e6a5b6db592acae039fed54b5c8844cd35 ] In predicate_parse, there is an error path that is not going to out_free instead it returns directly which leads to a memory leak. Link: http://lkml.kernel.org/r/20190920225800.3870-1-navid.emamdoost@gmail.com Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
Navid Emamdoost
authored and
Greg Kroah-Hartman
commited |
7deb2dcb89 | |
The code to register a wakeup callback exists outside of the #ifdef
CONFIG_HIGH_RES_TIMERS which actually uses it, causing compilation errors.
Move it inside the block, where it belongs.
Bug: 162654685
Fixes:
J. Avila
commited |
736f30b8b1 | |
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Merge 4.19.135 into android-4.19-stable
Changes in 4.19.135
soc: qcom: rpmh: Dirt can only make you dirtier, not cleaner
gpio: arizona: handle pm_runtime_get_sync failure case
gpio: arizona: put pm_runtime in case of failure
pinctrl: amd: fix npins for uart0 in kerncz_groups
mac80211: allow rx of mesh eapol frames with default rx key
scsi: scsi_transport_spi: Fix function pointer check
xtensa: fix __sync_fetch_and_{and,or}_4 declarations
xtensa: update *pos in cpuinfo_op.next
drivers/net/wan/lapbether: Fixed the value of hard_header_len
net: sky2: initialize return of gm_phy_read
drm/nouveau/i2c/g94-: increase NV_PMGR_DP_AUXCTL_TRANSACTREQ timeout
drivers/firmware/psci: Fix memory leakage in alloc_init_cpu_groups()
fuse: fix weird page warning
irqdomain/treewide: Keep firmware node unconditionally allocated
SUNRPC reverting d03727b248d0 ("NFSv4 fix CLOSE not waiting for direct IO compeletion")
spi: spi-fsl-dspi: Exit the ISR with IRQ_NONE when it's not ours
tipc: clean up skb list lock handling on send path
IB/umem: fix reference count leak in ib_umem_odp_get()
uprobes: Change handle_swbp() to send SIGTRAP with si_code=SI_KERNEL, to fix GDB regression
ALSA: info: Drop WARN_ON() from buffer NULL sanity check
ASoC: rt5670: Correct RT5670_LDO_SEL_MASK
btrfs: fix double free on ulist after backref resolution failure
btrfs: fix mount failure caused by race with umount
btrfs: fix page leaks after failure to lock page for delalloc
bnxt_en: Fix race when modifying pause settings.
fpga: dfl: fix bug in port reset handshake
hippi: Fix a size used in a 'pci_free_consistent()' in an error handling path
ax88172a: fix ax88172a_unbind() failures
net: dp83640: fix SIOCSHWTSTAMP to update the struct with actual configuration
ieee802154: fix one possible memleak in adf7242_probe
drm: sun4i: hdmi: Fix inverted HPD result
net: smc91x: Fix possible memory leak in smc_drv_probe()
bonding: check error value of register_netdevice() immediately
mlxsw: destroy workqueue when trap_register in mlxsw_emad_init
qed: suppress "don't support RoCE & iWARP" flooding on HW init
ipvs: fix the connection sync failed in some cases
net: ethernet: ave: Fix error returns in ave_init
i2c: rcar: always clear ICSAR to avoid side effects
bonding: check return value of register_netdevice() in bond_newlink()
serial: exar: Fix GPIO configuration for Sealevel cards based on XR17V35X
scripts/decode_stacktrace: strip basepath from all paths
scripts/gdb: fix lx-symbols 'gdb.error' while loading modules
HID: i2c-hid: add Mediacom FlexBook edge13 to descriptor override
HID: alps: support devices with report id 2
HID: steam: fixes race in handling device list.
HID: apple: Disable Fn-key key-re-mapping on clone keyboards
dmaengine: tegra210-adma: Fix runtime PM imbalance on error
Input: add `SW_MACHINE_COVER`
spi: mediatek: use correct SPI_CFG2_REG MACRO
regmap: dev_get_regmap_match(): fix string comparison
hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow
dmaengine: ioat setting ioat timeout as module parameter
Input: synaptics - enable InterTouch for ThinkPad X1E 1st gen
usb: gadget: udc: gr_udc: fix memleak on error handling path in gr_ep_init()
hwmon: (adm1275) Make sure we are reading enough data for different chips
hwmon: (scmi) Fix potential buffer overflow in scmi_hwmon_probe()
arm64: Use test_tsk_thread_flag() for checking TIF_SINGLESTEP
x86: math-emu: Fix up 'cmp' insn for clang ias
RISC-V: Upgrade smp_mb__after_spinlock() to iorw,iorw
binder: Don't use mmput() from shrinker function.
usb: xhci-mtk: fix the failure of bandwidth allocation
usb: xhci: Fix ASM2142/ASM3142 DMA addressing
Revert "cifs: Fix the target file was deleted when rename failed."
staging: wlan-ng: properly check endpoint types
staging: comedi: addi_apci_1032: check INSN_CONFIG_DIGITAL_TRIG shift
staging: comedi: ni_6527: fix INSN_CONFIG_DIGITAL_TRIG support
staging: comedi: addi_apci_1500: check INSN_CONFIG_DIGITAL_TRIG shift
staging: comedi: addi_apci_1564: check INSN_CONFIG_DIGITAL_TRIG shift
serial: 8250: fix null-ptr-deref in serial8250_start_tx()
serial: 8250_mtk: Fix high-speed baud rates clamping
fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.
vt: Reject zero-sized screen buffer size.
Makefile: Fix GCC_TOOLCHAIN_DIR prefix for Clang cross compilation
mm/memcg: fix refcount error while moving and swapping
mm: memcg/slab: synchronize access to kmem_cache dying flag using a spinlock
mm: memcg/slab: fix memory leak at non-root kmem_cache destroy
io-mapping: indicate mapping failure
drm/amdgpu: Fix NULL dereference in dpm sysfs handlers
drm/amd/powerplay: fix a crash when overclocking Vega M
parisc: Add atomic64_set_release() define to avoid CPU soft lockups
x86, vmlinux.lds: Page-align end of ..page_aligned sections
ASoC: rt5670: Add new gpio1_is_ext_spk_en quirk and enable it on the Lenovo Miix 2 10
ASoC: qcom: Drop HAS_DMA dependency to fix link failure
dm integrity: fix integrity recalculation that is improperly skipped
ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb
ath9k: Fix regression with Atheros 9271
Linux 4.19.135
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I0bbcde83e7c810352d998f28d3484efa2b9ede8e
Greg Kroah-Hartman
commited |
bcf9517454 | |
commit fe5ed7ab99c656bd2f5b79b49df0e9ebf2cead8a upstream.
If a tracee is uprobed and it hits int3 inserted by debugger, handle_swbp()
does send_sig(SIGTRAP, current, 0) which means si_code == SI_USER. This used
to work when this code was written, but then GDB started to validate si_code
and now it simply can't use breakpoints if the tracee has an active uprobe:
# cat test.c
void unused_func(void)
{
}
int main(void)
{
return 0;
}
# gcc -g test.c -o test
# perf probe -x ./test -a unused_func
# perf record -e probe_test:unused_func gdb ./test -ex run
GNU gdb (GDB) 10.0.50.20200714-git
...
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00007ffff7ddf909 in dl_main () from /lib64/ld-linux-x86-64.so.2
(gdb)
The tracee hits the internal breakpoint inserted by GDB to monitor shared
library events but GDB misinterprets this SIGTRAP and reports a signal.
Change handle_swbp() to use force_sig(SIGTRAP), this matches do_int3_user()
and fixes the problem.
This is the minimal fix for -stable, arch/x86/kernel/uprobes.c is equally
wrong; it should use send_sigtrap(TRAP_TRACE) instead of send_sig(SIGTRAP),
but this doesn't confuse GDB and needs another x86-specific patch.
Reported-by: Aaron Merey <amerey@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200723154420.GA32043@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Oleg Nesterov
authored and
Greg Kroah-Hartman
commited |
2297df90b2 | |
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Merge 4.19.134 into android-4.19-stable
Changes in 4.19.134
perf: Make perf able to build with latest libbfd
net: rmnet: fix lower interface leak
genetlink: remove genl_bind
ipv4: fill fl4_icmp_{type,code} in ping_v4_sendmsg
l2tp: remove skb_dst_set() from l2tp_xmit_skb()
llc: make sure applications use ARPHRD_ETHER
net: Added pointer check for dst->ops->neigh_lookup in dst_neigh_lookup_skb
net_sched: fix a memory leak in atm_tc_init()
net: usb: qmi_wwan: add support for Quectel EG95 LTE modem
tcp: fix SO_RCVLOWAT possible hangs under high mem pressure
tcp: make sure listeners don't initialize congestion-control state
tcp: md5: add missing memory barriers in tcp_md5_do_add()/tcp_md5_hash_key()
tcp: md5: do not send silly options in SYNCOOKIES
tcp: md5: refine tcp_md5_do_add()/tcp_md5_hash_key() barriers
tcp: md5: allow changing MD5 keys in all socket states
cgroup: fix cgroup_sk_alloc() for sk_clone_lock()
cgroup: Fix sock_cgroup_data on big-endian.
sched: consistently handle layer3 header accesses in the presence of VLANs
vlan: consolidate VLAN parsing code and limit max parsing depth
drm/msm: fix potential memleak in error branch
drm/exynos: fix ref count leak in mic_pre_enable
m68k: nommu: register start of the memory with memblock
m68k: mm: fix node memblock init
arm64/alternatives: use subsections for replacement sequences
tpm_tis: extra chip->ops check on error path in tpm_tis_core_init
gfs2: read-only mounts should grab the sd_freeze_gl glock
i2c: eg20t: Load module automatically if ID matches
arm64/alternatives: don't patch up internal branches
iio:magnetometer:ak8974: Fix alignment and data leak issues
iio:humidity:hdc100x Fix alignment and data leak issues
iio: magnetometer: ak8974: Fix runtime PM imbalance on error
iio: mma8452: Add missed iio_device_unregister() call in mma8452_probe()
iio: pressure: zpa2326: handle pm_runtime_get_sync failure
iio:humidity:hts221 Fix alignment and data leak issues
iio:pressure:ms5611 Fix buffer element alignment
iio:health:afe4403 Fix timestamp alignment and prevent data leak.
spi: fix initial SPI_SR value in spi-fsl-dspi
spi: spi-fsl-dspi: Fix lockup if device is shutdown during SPI transfer
net: dsa: bcm_sf2: Fix node reference count
of: of_mdio: Correct loop scanning logic
Revert "usb/ohci-platform: Fix a warning when hibernating"
Revert "usb/xhci-plat: Set PM runtime as active on resume"
Revert "usb/ehci-platform: Set PM runtime as active on resume"
net: sfp: add support for module quirks
net: sfp: add some quirks for GPON modules
HID: quirks: Remove ITE 8595 entry from hid_have_special_driver
ARM: at91: pm: add quirk for sam9x60's ulp1
scsi: sr: remove references to BLK_DEV_SR_VENDOR, leave it enabled
ALSA: usb-audio: Create a registration quirk for Kingston HyperX Amp (0951:16d8)
doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode
mmc: sdhci: do not enable card detect interrupt for gpio cd type
ALSA: usb-audio: Rewrite registration quirk handling
ACPI: video: Use native backlight on Acer Aspire 5783z
ALSA: usb-audio: Add registration quirk for Kingston HyperX Cloud Alpha S
Input: mms114 - add extra compatible for mms345l
ACPI: video: Use native backlight on Acer TravelMate 5735Z
ALSA: usb-audio: Add registration quirk for Kingston HyperX Cloud Flight S
iio:health:afe4404 Fix timestamp alignment and prevent data leak.
phy: sun4i-usb: fix dereference of pointer phy0 before it is null checked
arm64: dts: meson: add missing gxl rng clock
spi: spi-sun6i: sun6i_spi_transfer_one(): fix setting of clock rate
usb: gadget: udc: atmel: fix uninitialized read in debug printk
staging: comedi: verify array index is correct before using it
Revert "thermal: mediatek: fix register index error"
ARM: dts: socfpga: Align L2 cache-controller nodename with dtschema
regmap: debugfs: Don't sleep while atomic for fast_io regmaps
copy_xstate_to_kernel: Fix typo which caused GDB regression
apparmor: ensure that dfa state tables have entries
perf stat: Zero all the 'ena' and 'run' array slot stats for interval mode
soc: qcom: rpmh: Update dirty flag only when data changes
soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data
soc: qcom: rpmh-rsc: Clear active mode configuration for wake TCS
soc: qcom: rpmh-rsc: Allow using free WAKE TCS for active request
mtd: rawnand: marvell: Use nand_cleanup() when the device is not yet registered
mtd: rawnand: marvell: Fix probe error path
mtd: rawnand: timings: Fix default tR_max and tCCS_min timings
mtd: rawnand: brcmnand: fix CS0 layout
mtd: rawnand: oxnas: Keep track of registered devices
mtd: rawnand: oxnas: Unregister all devices on error
mtd: rawnand: oxnas: Release all devices in the _remove() path
slimbus: core: Fix mismatch in of_node_get/put
HID: magicmouse: do not set up autorepeat
HID: quirks: Always poll Obins Anne Pro 2 keyboard
HID: quirks: Ignore Simply Automated UPB PIM
ALSA: line6: Perform sanity check for each URB creation
ALSA: line6: Sync the pending work cancel at disconnection
ALSA: usb-audio: Fix race against the error recovery URB submission
ALSA: hda/realtek - change to suitable link model for ASUS platform
ALSA: hda/realtek - Enable Speaker for ASUS UX533 and UX534
USB: c67x00: fix use after free in c67x00_giveback_urb
usb: dwc2: Fix shutdown callback in platform
usb: chipidea: core: add wakeup support for extcon
usb: gadget: function: fix missing spinlock in f_uac1_legacy
USB: serial: iuu_phoenix: fix memory corruption
USB: serial: cypress_m8: enable Simply Automated UPB PIM
USB: serial: ch341: add new Product ID for CH340
USB: serial: option: add GosunCn GM500 series
USB: serial: option: add Quectel EG95 LTE modem
virt: vbox: Fix VBGL_IOCTL_VMMDEV_REQUEST_BIG and _LOG req numbers to match upstream
virt: vbox: Fix guest capabilities mask check
virtio: virtio_console: add missing MODULE_DEVICE_TABLE() for rproc serial
serial: mxs-auart: add missed iounmap() in probe failure and remove
ovl: inode reference leak in ovl_is_inuse true case.
ovl: relax WARN_ON() when decoding lower directory file handle
ovl: fix unneeded call to ovl_change_flags()
fuse: Fix parameter for FS_IOC_{GET,SET}FLAGS
Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()"
mei: bus: don't clean driver pointer
Input: i8042 - add Lenovo XiaoXin Air 12 to i8042 nomux list
uio_pdrv_genirq: fix use without device tree and no interrupt
timer: Prevent base->clk from moving backward
timer: Fix wheel index calculation on last level
MIPS: Fix build for LTS kernel caused by backporting lpj adjustment
riscv: use 16KB kernel stack on 64-bit
hwmon: (emc2103) fix unable to change fan pwm1_enable attribute
powerpc/book3s64/pkeys: Fix pkey_access_permitted() for execute disable pkey
intel_th: pci: Add Jasper Lake CPU support
intel_th: pci: Add Tiger Lake PCH-H support
intel_th: pci: Add Emmitsburg PCH support
intel_th: Fix a NULL dereference when hub driver is not loaded
dmaengine: fsl-edma: Fix NULL pointer exception in fsl_edma_tx_handler
misc: atmel-ssc: lock with mutex instead of spinlock
thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power
arm64: ptrace: Override SPSR.SS when single-stepping is enabled
arm64: ptrace: Consistently use pseudo-singlestep exceptions
arm64: compat: Ensure upper 32 bits of x0 are zero on syscall return
sched: Fix unreliable rseq cpu_id for new tasks
sched/fair: handle case of task_h_load() returning 0
genirq/affinity: Handle affinity setting on inactive interrupts correctly
printk: queue wake_up_klogd irq_work only if per-CPU areas are ready
libceph: don't omit recovery_deletes in target_copy()
rxrpc: Fix trace string
spi: sprd: switch the sequence of setting WDG_LOAD_LOW and _HIGH
Linux 4.19.134
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ieeb9e03f4a2d51aeebe3a3eadd9c1b93a26088a0
Greg Kroah-Hartman
commited |
b41585fc93 | |
commit ab6f762f0f53162d41497708b33c9a3236d3609e upstream.
printk_deferred(), similarly to printk_safe/printk_nmi, does not
immediately attempt to print a new message on the consoles, avoiding
calls into non-reentrant kernel paths, e.g. scheduler or timekeeping,
which potentially can deadlock the system.
Those printk() flavors, instead, rely on per-CPU flush irq_work to print
messages from safer contexts. For same reasons (recursive scheduler or
timekeeping calls) printk() uses per-CPU irq_work in order to wake up
user space syslog/kmsg readers.
However, only printk_safe/printk_nmi do make sure that per-CPU areas
have been initialised and that it's safe to modify per-CPU irq_work.
This means that, for instance, should printk_deferred() be invoked "too
early", that is before per-CPU areas are initialised, printk_deferred()
will perform illegal per-CPU access.
Lech Perczak [0] reports that after commit 1b710b1b10ef ("char/random:
silence a lockdep splat with printk()") user-space syslog/kmsg readers
are not able to read new kernel messages.
The reason is printk_deferred() being called too early (as was pointed
out by Petr and John).
Fix printk_deferred() and do not queue per-CPU irq_work before per-CPU
areas are initialized.
Link: https://lore.kernel.org/lkml/aa0732c6-5c4e-8a8b-a1c1-75ebe3dca05b@camlintechnologies.com/
Reported-by: Lech Perczak <l.perczak@camlintechnologies.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Tested-by: Jann Horn <jannh@google.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Sergey Senozhatsky
authored and
Greg Kroah-Hartman
commited |
caffd39d4f | |
commit baedb87d1b53532f81b4bd0387f83b05d4f7eb9a upstream.
Setting interrupt affinity on inactive interrupts is inconsistent when
hierarchical irq domains are enabled. The core code should just store the
affinity and not call into the irq chip driver for inactive interrupts
because the chip drivers may not be in a state to handle such requests.
X86 has a hacky workaround for that but all other irq chips have not which
causes problems e.g. on GIC V3 ITS.
Instead of adding more ugly hacks all over the place, solve the problem in
the core code. If the affinity is set on an inactive interrupt then:
- Store it in the irq descriptors affinity mask
- Update the effective affinity to reflect that so user space has
a consistent view
- Don't call into the irq chip driver
This is the core equivalent of the X86 workaround and works correctly
because the affinity setting is established in the irq chip when the
interrupt is activated later on.
Note, that this is only effective when hierarchical irq domains are enabled
by the architecture. Doing it unconditionally would break legacy irq chip
implementations.
For hierarchial irq domains this works correctly as none of the drivers can
have a dependency on affinity setting in inactive state by design.
Remove the X86 workaround as it is not longer required.
Fixes:
Thomas Gleixner
authored and
Greg Kroah-Hartman
commited |
2048e4375c | |
commit 01cfcde9c26d8555f0e6e9aea9d6049f87683998 upstream. task_h_load() can return 0 in some situations like running stress-ng mmapfork, which forks thousands of threads, in a sched group on a 224 cores system. The load balance doesn't handle this correctly because env->imbalance never decreases and it will stop pulling tasks only after reaching loop_max, which can be equal to the number of running tasks of the cfs. Make sure that imbalance will be decreased by at least 1. misfit task is the other feature that doesn't handle correctly such situation although it's probably more difficult to face the problem because of the smaller number of CPUs and running tasks on heterogenous system. We can't simply ensure that task_h_load() returns at least one because it would imply to handle underflow in other places. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <valentin.schneider@arm.com> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: <stable@vger.kernel.org> # v4.4+ Link: https://lkml.kernel.org/r/20200710152426.16981-1-vincent.guittot@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Vincent Guittot
authored and
Greg Kroah-Hartman
commited |
0d9d559b57 | |
commit ce3614daabea8a2d01c1dd17ae41d1ec5e5ae7db upstream.
While integrating rseq into glibc and replacing glibc's sched_getcpu
implementation with rseq, glibc's tests discovered an issue with
incorrect __rseq_abi.cpu_id field value right after the first time
a newly created process issues sched_setaffinity.
For the records, it triggers after building glibc and running tests, and
then issuing:
for x in {1..2000} ; do posix/tst-affinity-static & done
and shows up as:
error: Unexpected CPU 2, expected 0
error: Unexpected CPU 2, expected 0
error: Unexpected CPU 2, expected 0
error: Unexpected CPU 2, expected 0
error: Unexpected CPU 138, expected 0
error: Unexpected CPU 138, expected 0
error: Unexpected CPU 138, expected 0
error: Unexpected CPU 138, expected 0
This is caused by the scheduler invoking __set_task_cpu() directly from
sched_fork() and wake_up_new_task(), thus bypassing rseq_migrate() which
is done by set_task_cpu().
Add the missing rseq_migrate() to both functions. The only other direct
use of __set_task_cpu() is done by init_idle(), which does not involve a
user-space task.
Based on my testing with the glibc test-case, just adding rseq_migrate()
to wake_up_new_task() is sufficient to fix the observed issue. Also add
it to sched_fork() to keep things consistent.
The reason why this never triggered so far with the rseq/basic_test
selftest is unclear.
The current use of sched_getcpu(3) does not typically require it to be
always accurate. However, use of the __rseq_abi.cpu_id field within rseq
critical sections requires it to be accurate. If it is not accurate, it
can cause corruption in the per-cpu data targeted by rseq critical
sections in user-space.
Reported-By: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-By: Florian Weimer <fweimer@redhat.com>
Cc: stable@vger.kernel.org # v4.18+
Link: https://lkml.kernel.org/r/20200707201505.2632-1-mathieu.desnoyers@efficios.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Mathieu Desnoyers
authored and
Greg Kroah-Hartman
commited |
d2fc2e5774 | |
commit e2a71bdea81690b6ef11f4368261ec6f5b6891aa upstream.
When an expiration delta falls into the last level of the wheel, that delta
has be compared against the maximum possible delay and reduced to fit in if
necessary.
However instead of comparing the delta against the maximum, the code
compares the actual expiry against the maximum. Then instead of fixing the
delta to fit in, it sets the maximum delta as the expiry value.
This can result in various undesired outcomes, the worst possible one
being a timer expiring 15 days ahead to fire immediately.
Fixes:
Frederic Weisbecker
authored and
Greg Kroah-Hartman
commited |
5b9caae615 | |
commit 30c66fc30ee7a98c4f3adf5fb7e213b61884474f upstream.
When a timer is enqueued with a negative delta (ie: expiry is below
base->clk), it gets added to the wheel as expiring now (base->clk).
Yet the value that gets stored in base->next_expiry, while calling
trigger_dyntick_cpu(), is the initial timer->expires value. The
resulting state becomes:
base->next_expiry < base->clk
On the next timer enqueue, forward_timer_base() may accidentally
rewind base->clk. As a possible outcome, timers may expire way too
early, the worst case being that the highest wheel levels get spuriously
processed again.
To prevent from that, make sure that base->next_expiry doesn't get below
base->clk.
Fixes:
Frederic Weisbecker
authored and
Greg Kroah-Hartman
commited |
e68e2c661a | |
[ Upstream commit ad0f75e5f57ccbceec13274e1e242f2b5a6397ed ] When we clone a socket in sk_clone_lock(), its sk_cgrp_data is copied, so the cgroup refcnt must be taken too. And, unlike the sk_alloc() path, sock_update_netprioidx() is not called here. Therefore, it is safe and necessary to grab the cgroup refcnt even when cgroup_sk_alloc is disabled. sk_clone_lock() is in BH context anyway, the in_interrupt() would terminate this function if called there. And for sk_alloc() skcd->val is always zero. So it's safe to factor out the code to make it more readable. The global variable 'cgroup_sk_alloc_disabled' is used to determine whether to take these reference counts. It is impossible to make the reference counting correct unless we save this bit of information in skcd->val. So, add a new bit there to record whether the socket has already taken the reference counts. This obviously relies on kmalloc() to align cgroup pointers to at least 4 bytes, ARCH_KMALLOC_MINALIGN is certainly larger than that. This bug seems to be introduced since the beginning, commit 
Cong Wang
authored and
Greg Kroah-Hartman
commited |
0505cc4c90 |