Linus Torvalds
eb66ae0308
mremap: properly flush TLB before releasing the page ...
Jann Horn points out that our TLB flushing was subtly wrong for the
mremap() case. What makes mremap() special is that we don't follow the
usual "add page to list of pages to be freed, then flush tlb, and then
free pages". No, mremap() obviously just _moves_ the page from one page
table location to another.
That matters, because mremap() thus doesn't directly control the
lifetime of the moved page with a freelist: instead, the lifetime of the
page is controlled by the page table locking, that serializes access to
the entry.
As a result, we need to flush the TLB not just before releasing the lock
for the source location (to avoid any concurrent accesses to the entry),
but also before we release the destination page table lock (to avoid the
TLB being flushed after somebody else has already done something to that
page).
This also makes the whole "need_flush" logic unnecessary, since we now
always end up flushing the TLB for every valid entry.
Reported-and-tested-by: Jann Horn <jannh@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-10-18 11:30:52 +02:00
kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN
2018-08-17 16:20:30 -07:00
blkcg: delay blkg destruction until after writeback has finished
2018-08-31 14:48:56 -06:00
virtio_balloon: fix deadlock on OOM
2017-11-14 23:57:38 +02:00
docs/mm: bootmem: add overview documentation
2018-08-02 12:17:27 -06:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm/cma: remove unsupported gfp_mask parameter from cma_alloc()
2018-08-17 16:20:32 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mm/cma: remove unsupported gfp_mask parameter from cma_alloc()
2018-08-17 16:20:32 -07:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep
2017-12-11 14:54:44 +01:00
vfs: implement readahead(2) using POSIX_FADV_WILLNEED
2018-08-30 20:01:32 +02:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm: use new return type vm_fault_t
2018-06-07 17:34:36 -07:00
mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'
2017-12-14 16:00:48 -08:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm: Change return type int to vm_fault_t for fault handlers
2018-08-23 18:48:44 -07:00
mm/gup_benchmark: fix unsigned comparison to zero in __gup_benchmark_ioctl
2018-10-05 16:32:04 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
libnvdimm-for-4.19_dax-memory-failure
2018-08-25 18:43:59 -07:00
mremap: properly flush TLB before releasing the page
2018-10-18 11:30:52 +02:00
hugetlb: take PMD sharing into account when flushing tlb/caches
2018-10-05 16:32:04 -07:00
mm: rename page_counter's count/limit into usage/max
2018-06-07 17:34:35 -07:00
mm/memory_failure: Remove unused trapno from memory_failure
2018-01-23 12:17:42 -06:00
mm: Allocate the mm_cpumask (mm->cpu_bitmap[]) dynamically based on nr_cpu_ids
2018-07-17 09:35:30 +02:00
mm: Change return type int to vm_fault_t for fault handlers
2018-08-23 18:48:44 -07:00
mm/interval_tree.c: use vma_pages() helper
2018-01-31 17:18:37 -08:00
mm: disable deferred struct page for 32-bit arches
2018-09-20 22:01:11 +02:00
mm: clarify CONFIG_PAGE_POISONING and usage
2018-08-22 10:52:44 -07:00
mm: Change return type int to vm_fault_t for fault handlers
2018-08-23 18:48:44 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak: always register debugfs file
2018-09-04 16:45:02 -07:00
include/linux/compiler*.h: make compiler-*.h mutually exclusive
2018-08-22 17:31:34 -07:00
mm/list_lru: introduce list_lru_shrink_walk_irq()
2018-08-17 16:20:32 -07:00
mm: docs: fix parameter names mismatch
2018-02-06 18:32:48 -08:00
mm: madvise(MADV_DODUMP): allow hugetlbfs pages
2018-10-05 16:32:05 -07:00
vfs: implement readahead(2) using POSIX_FADV_WILLNEED
2018-08-30 20:01:32 +02:00
mm/memblock.c: replace u64 with phys_addr_t where appropriate
2018-08-17 16:20:30 -07:00
mm: memcontrol: print proper OOM header when no eligible victim left
2018-09-04 16:45:02 -07:00
alloc_file(): switch to passing O_... flags instead of FMODE_... mode
2018-07-12 10:02:57 -04:00
libnvdimm-for-4.19_dax-memory-failure
2018-08-25 18:43:59 -07:00
mm/cow: don't bother write protecting already write-protected pages
2018-08-25 13:15:03 -07:00
mm/hugetlb: filter out hugetlb pages if HUGEPAGE migration is not supported.
2018-09-04 16:45:02 -07:00
mm: access zone->node via zone_to_nid() and zone_set_nid()
2018-08-22 10:52:45 -07:00
mm/mempool.c: add missing parameter description
2018-08-22 10:52:44 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Merge branch 'akpm'
2018-10-05 16:33:03 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dax: remove VM_MIXEDMAP for fsdax and device dax
2018-08-17 16:20:27 -07:00
mm: access zone->node via zone_to_nid() and zone_set_nid()
2018-08-22 10:52:45 -07:00
mm/mmap.c: don't clobber partially overlapping VMA with MAP_FIXED_NOREPLACE
2018-10-13 09:31:02 +02:00
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
mm, oom: distinguish blockable mode for mmu notifiers
2018-08-22 10:52:44 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings
2018-06-20 19:10:01 +02:00
mremap: properly flush TLB before releasing the page
2018-10-18 11:30:52 +02:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mm/memblock: add a name for memblock flags enumeration
2018-08-02 12:17:27 -06:00
mm: provide a fallback for PAGE_KERNEL_EXEC for architectures
2018-08-17 16:20:29 -07:00
mm, oom: fix missing tlb_finish_mmu() in __oom_reap_task_mm().
2018-09-04 16:45:02 -07:00
notifier: Remove notifier header file wherever not used
2018-08-30 12:56:40 +02:00
mm, sched/numa: Remove remaining traces of NUMA rate-limiting
2018-10-09 08:30:51 +02:00
memcg: introduce memory.min
2018-06-07 17:34:36 -07:00
mm/page_ext.c: constify lookup_page_ext() argument
2018-08-17 16:20:28 -07:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
swap,blkcg: issue swap io with the appropriate context
2018-07-09 09:07:54 -06:00
mm, migrate: remove reason argument from new_page_t
2018-04-11 10:28:32 -07:00
mm: use octal not symbolic permissions
2018-06-15 07:55:25 +09:00
mm/page_poison.c: make early_page_poison_param() __init
2018-04-05 21:36:26 -07:00
mm, page_vma_mapped: Introduce pfn_in_hpage()
2018-01-22 12:15:57 -08:00
mm: kernel-doc: add missing parameter descriptions
2018-04-05 21:36:27 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
percpu: allow select gfp to be passed to underlying allocators
2018-02-18 05:33:01 -08:00
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
percpu: allow select gfp to be passed to underlying allocators
2018-02-18 05:33:01 -08:00
percpu: stop leaking bitmap metadata blocks
2018-10-07 14:50:12 -07:00
mm: do not lose dirty and accessed bits in pmdp_invalidate()
2018-01-31 17:18:38 -08:00
mm: docs: add blank lines to silence sphinx "Unexpected indentation" errors
2018-02-06 18:32:48 -08:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vfs: implement readahead(2) using POSIX_FADV_WILLNEED
2018-08-30 20:01:32 +02:00
mm: migration: fix migration of huge PMD shared pages
2018-10-05 16:32:04 -07:00
mm: fix RODATA_TEST failure "rodata_test: test data was not read only"
2017-10-03 17:54:24 -07:00
mm: shmem.c: Correctly annotate new inodes for lockdep
2018-09-20 22:01:11 +02:00
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
mm: introduce CONFIG_MEMCG_KMEM as combination of CONFIG_MEMCG && !CONFIG_SLOB
2018-08-17 16:20:30 -07:00
mm: introduce CONFIG_MEMCG_KMEM as combination of CONFIG_MEMCG && !CONFIG_SLOB
2018-08-17 16:20:30 -07:00
slab: __GFP_ZERO is incompatible with a constructor
2018-06-07 17:34:34 -07:00
notifier: Remove notifier header file wherever not used
2018-08-30 12:56:40 +02:00
mm/sparse: delete old sparse_init and enable new one
2018-08-17 16:20:32 -07:00
mm/sparse: delete old sparse_init and enable new one
2018-08-17 16:20:32 -07:00
mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS
2018-05-22 06:59:39 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mm, swap, get_swap_pages: use entry_size instead of cluster in parameter
2018-08-22 10:52:44 -07:00
treewide: kvzalloc() -> kvcalloc()
2018-06-12 16:19:22 -07:00
mm/swapfile.c: put_swap_page: share more between huge/normal code path
2018-08-22 10:52:44 -07:00
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
usercopy: Allow boot cmdline disabling of hardening
2018-07-04 08:04:52 -07:00
userfaultfd: prevent non-cooperative events vs mcopy_atomic races
2018-06-07 17:34:38 -07:00
mm/util.c: improve kvfree() kerneldoc
2018-09-04 16:45:02 -07:00
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
mm: provide a fallback for PAGE_KERNEL_EXEC for architectures
2018-08-17 16:20:29 -07:00
mm/vmpressure.c: convert to use match_string() helper
2018-06-07 17:34:36 -07:00
mm/vmscan.c: fix int overflow in callers of do_shrink_slab()
2018-10-05 16:32:05 -07:00
mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly
2018-10-05 16:32:05 -07:00
mm/list_lru: introduce list_lru_shrink_walk_irq()
2018-08-17 16:20:32 -07:00
z3fold: fix reclaim lock-ups
2018-05-11 17:28:45 -07:00
mm: docs: fix parameter names mismatch
2018-02-06 18:32:48 -08:00
mm/zpool.c: zpool_evictable: fix mismatch in parameter name and kernel-doc
2018-02-21 15:35:43 -08:00
mm/zsmalloc.c: make several functions and a struct static
2018-08-17 16:20:30 -07:00
zswap: re-check zswap_is_full() after do zswap_shrink()
2018-07-26 19:38:03 -07:00
eb66ae0308