Joerg Roedel
ce93e0169b
x86, vmlinux.lds: Page-align end of ..page_aligned sections ...
[ Upstream commit de2b41be8fcccb2f5b6c480d35df590476344201 ]
On x86-32 the idt_table with 256 entries needs only 2048 bytes. It is
page-aligned, but the end of the .bss..page_aligned section is not
guaranteed to be page-aligned.
As a result, objects from other .bss sections may end up on the same 4k
page as the idt_table, and will accidentially get mapped read-only during
boot, causing unexpected page-faults when the kernel writes to them.
This could be worked around by making the objects in the page aligned
sections page sized, but that's wrong.
Explicit sections which store only page aligned objects have an implicit
guarantee that the object is alone in the page in which it is placed. That
works for all objects except the last one. That's inconsistent.
Enforcing page sized objects for these sections would wreckage memory
sanitizers, because the object becomes artificially larger than it should
be and out of bound access becomes legit.
Align the end of the .bss..page_aligned and .data..page_aligned section on
page-size so all objects places in these sections are guaranteed to have
their own page.
[ tglx: Amended changelog ]
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200721093448.10417-1-joro@8bytes.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-08-21 11:01:49 +02:00
bitops: Do not default to __clear_bit() for __clear_bit_unlock()
2016-03-21 10:50:48 +01:00
mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h>
2015-02-11 17:06:03 -08:00
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
asm-prototypes: Clear any CPP defines before declaring the functions
2017-01-12 11:39:07 +01:00
locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API
2016-07-07 09:16:20 +02:00
locking/atomic: Remove linux/atomic.h:atomic_fetch_or()
2016-06-16 10:48:32 +02:00
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
2016-06-16 10:48:32 +02:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
locking/spinlock, arch: Update and fix spin_unlock_wait() implementations
2016-06-14 11:55:15 +02:00
arch: Prepare for smp_mb__{before,after}_atomic()
2014-04-18 11:40:30 +02:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
bug.h: work around GCC PR82365 in BUG()
2019-07-10 09:55:44 +02:00
ipv4: Update parameters for csum_tcpudp_magic to their original types
2016-03-13 23:55:13 -04:00
asm-generic: COMMON_CLK defines __clk_{get,put}
2014-09-25 18:00:45 -07:00
LLVMLinux: Remove warning about returning an uninitialized variable
2014-04-09 13:44:35 -07:00
asm-generic: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
2015-10-15 00:21:13 +02:00
cputime: Generic on-demand virtual cputime accounting
2013-01-27 19:23:27 +01:00
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
sched/cputime: Count actually elapsed irq & softirq time
2016-07-14 10:42:34 +02:00
__div64_32(): make it overridable at compile time
2015-11-16 14:42:12 -05:00
asm-generic: Add dma-contiguous.h
2014-09-22 13:35:51 +02:00
Merge branch 'akpm' (patches from Andrew)
2015-09-08 17:52:23 -07:00
Split arch_align_stack() out from asm-generic/system.h
2012-03-28 18:30:03 +01:00
Revert "default exported asm symbols to zero"
2016-12-07 08:39:00 -08:00
asm-generic: Fix local variable shadow in __set_fixmap_offset
2016-02-16 15:10:44 +00:00
futex: Remove duplicated code and fix undefined behaviour
2018-05-19 10:27:00 +02:00
asm-generic: fix -Wtype-limits compiler warnings
2019-08-25 10:51:50 +02:00
gpio: allow setting ARCH_NR_GPIOS from Kconfig
2016-02-19 00:22:54 +01:00
mm: Fix generic hugetlb pte check return type.
2013-10-02 20:02:35 -04:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
asm-generic/io.h: add io{read,write}64 accessors
2016-05-31 16:41:50 +08:00
include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
2014-06-06 16:08:13 -07:00
asm-generic/io.h: add io{read,write}64 accessors
2016-05-31 16:41:50 +08:00
irq_work: Introduce arch_irq_work_has_interrupt()
2014-09-13 18:38:07 +02:00
UAPI: Set up uapi/asm/Kbuild.asm
2012-10-02 18:01:56 +01:00
asm-generic: remove km_type definitions
2012-07-24 15:27:30 +08:00
KVM: add kvm_para_available to asm-generic/kvm_para.h
2013-06-05 13:21:29 +03:00
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
mm: add PHYS_PFN, use it in __phys_to_pfn()
2016-01-14 16:00:49 -08:00
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mm/core, x86/mm/pkeys: Differentiate instruction fetches
2016-02-18 19:46:29 +01:00
asm-generic/mmu.h: Add support for FDPIC
2012-12-09 23:14:14 +01:00
asm-generic: Remove asm-generic arch_bprm_mm_init()
2014-11-22 21:52:08 +01:00
Make most arch asm/module.h files use asm-generic/module.h
2012-09-28 14:31:03 +09:30
asm-generic: Add msi.h
2014-11-23 13:01:47 +01:00
locking/mutex: Optimize mutex_trylock() fast-path
2016-06-08 15:17:01 +02:00
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
locking/mutex: Optimize mutex_trylock() fast-path
2016-06-08 15:17:01 +02:00
asm-generic: page.h: Remove useless get_user_page and free_user_page
2016-02-26 15:24:55 +01:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
include: remove __dev* attributes.
2013-01-03 15:57:16 -08:00
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
percpu: make this_cpu_generic_read() atomic w.r.t. interrupts
2017-10-12 11:51:23 +02:00
ioremap: Update pgtable free interfaces with addr
2018-08-17 20:59:29 +02:00
sched/preempt: Fix preempt_count manipulations
2016-05-17 12:24:21 +02:00
locking/qrwlock: Fix write unlock bug on big endian systems
2016-08-10 14:13:27 +02:00
locking/qrwlock: Rename ->lock to ->wait_lock
2015-09-18 09:27:29 +02:00
locking/qspinlock: Use atomic_sub_return_release() in queued_spin_unlock()
2016-06-08 15:17:01 +02:00
locking/qspinlock: Pull in asm/byteorder.h to ensure correct endianness
2019-01-26 09:38:36 +01:00
asm-generic: remove _STK_LIM_MAX
2014-05-15 00:32:09 +01:00
locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update()
2016-06-08 15:16:59 +02:00
seccomp: Get compat syscalls from asm-generic header
2016-05-13 14:02:00 +02:00
mm: kmemleak: scan .data.ro_after_init
2016-11-11 08:12:37 -08:00
SIGNAL: Move generic copy_siginfo() to signal.h
2016-05-13 14:02:10 +02:00
unify default ptrace_signal_deliver
2012-11-29 00:01:23 -05:00
crypto: create generic version of ablk_helper
2013-09-24 06:02:24 +10:00
ARM: 7430/1: sizes.h: move from asm-generic to <linux/sizes.h>
2012-06-28 17:14:34 +01:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
Split the switch_to() wrapper out of asm-generic/system.h
2012-03-28 18:30:03 +01:00
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
burying unused conditionals
2013-02-14 09:21:15 -05:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
mm/mmu_gather: track page size with mmu gather and force flush if page size change
2016-07-26 16:19:19 -07:00
BUG: headers with BUG/BUG_ON etc. need linux/bug.h
2012-03-04 17:54:34 -05:00
include/asm-generic/topology.h: guard cpumask_of_node() macro argument
2020-06-03 08:16:42 +02:00
tracing,x86: Add a TSC trace_clock
2012-11-13 15:48:27 -05:00
exceptions: detritus removal
2016-09-27 21:15:14 -04:00
asm-generic: allow generic unaligned access if the arch supports it
2014-05-08 10:22:23 +02:00
We get rid of the general module prefix confusion with a binary config option,
2013-05-05 10:58:06 -07:00
x86, vmlinux.lds: Page-align end of ..page_aligned sections
2020-08-21 11:01:49 +02:00
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
Make asm/word-at-a-time.h available on all architectures
2015-07-08 16:41:55 -04:00
asm-generic: xor: mark static functions as __maybe_unused
2012-10-03 21:21:06 +02:00
ce93e0169b