linux/mm
Peter Xu ba841078cd mm/mempolicy: Allow lookup_node() to handle fatal signal
lookup_node() uses gup to pin the page and get node information.  It
checks against ret>=0 assuming the page will be filled in.  However it's
also possible that gup will return zero, for example, when the thread is
quickly killed with a fatal signal.  Teach lookup_node() to gracefully
return an error -EFAULT if it happens.

Meanwhile, initialize "page" to NULL to avoid potential risk of
exploiting the pointer.

Fixes: 4426e945df ("mm/gup: allow VM_FAULT_RETRY for multiple times")
Reported-by: syzbot+693dc11fcb53120b5559@syzkaller.appspotmail.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-07 19:34:31 -07:00
..
kasan kasan: unset panic_on_warn before calling panic() 2020-04-07 10:43:44 -07:00
backing-dev.c memcg: fix a crash in wb_workfn when a device disappears 2020-01-31 10:30:36 -08:00
balloon_compaction.c
cleancache.c
cma_debug.c mm/cma_debug.c: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops 2019-12-01 12:59:09 -08:00
cma.c mm/cma.c: switch to bitmap_zalloc() for cma bitmap allocation 2019-12-01 12:59:09 -08:00
cma.h
compaction.c mm/compaction: add missing annotation for compact_lock_irqsave 2020-04-07 10:43:41 -07:00
debug_page_ref.c
debug.c mm: dump_page(): additional diagnostics for huge pinned pages 2020-04-02 09:35:27 -07:00
dmapool.c mm/dmapool.c: micro-optimisation remove unnecessary branch 2020-04-07 10:43:42 -07:00
early_ioremap.c mm/early_ioremap.c: use %pa to print resource_size_t variables 2020-01-31 10:30:38 -08:00
fadvise.c
failslab.c
filemap.c mm: huge tmpfs: try to split_huge_page() when punching hole 2020-04-07 10:43:41 -07:00
frame_vector.c
frontswap.c
gup_benchmark.c mm/gup_benchmark: support pin_user_pages() and related calls 2020-04-02 09:35:27 -07:00
gup.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
highmem.c mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions 2019-12-10 10:12:55 +01:00
hmm.c mm/hmm: return error for non-vma snapshots 2020-03-30 16:58:36 -03:00
huge_memory.c userfaultfd: wp: support swap and page migration 2020-04-07 10:43:39 -07:00
hugetlb_cgroup.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
hugetlb.c mm/hugetlb: add missing annotation for gather_surplus_pages() 2020-04-07 10:43:41 -07:00
hwpoison-inject.c mm/hwpoison-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops 2019-12-01 12:59:09 -08:00
init-mm.c
internal.h mm: add function __putback_isolated_page 2020-04-07 10:43:38 -07:00
interval_tree.c
Kconfig mm/zswap: allow setting default status, compressor and allocator in Kconfig 2020-04-07 10:43:41 -07:00
Kconfig.debug mm: add generic ptdump 2020-02-04 03:05:25 +00:00
khugepaged.c khugepaged: skip collapse if uffd-wp detected 2020-04-07 10:43:39 -07:00
kmemleak-test.c
kmemleak.c mm/kmemleak.c: use address-of operator on section symbols 2020-04-02 09:35:26 -07:00
ksm.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
list_lru.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
maccess.c uaccess: Add strict non-pagefault kernel-space read function 2019-11-02 12:39:12 -07:00
madvise.c mm: do not allow MADV_PAGEOUT for CoW pages 2020-03-21 18:56:06 -07:00
Makefile mm: introduce Reported pages 2020-04-07 10:43:38 -07:00
mapping_dirty_helpers.c mm/mapping_dirty_helpers: update huge page-table entry callbacks 2020-04-02 09:35:29 -07:00
memblock.c mm/memblock.c: remove redundant assignment to variable max_addr 2020-04-02 09:35:32 -07:00
memcontrol.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
memfd.c
memory_hotplug.c mm/memory_hotplug.c: use __pfn_to_section() instead of open-coding 2020-04-07 10:43:41 -07:00
memory-failure.c mm: code cleanup for MADV_FREE 2020-04-07 10:43:38 -07:00
memory.c mm: fix ambiguous comments for better code readability 2020-04-07 10:43:41 -07:00
mempolicy.c mm/mempolicy: Allow lookup_node() to handle fatal signal 2020-04-07 19:34:31 -07:00
mempool.c
memremap.c memremap: add an owner field to struct dev_pagemap 2020-03-26 14:33:37 -03:00
memtest.c
migrate.c userfaultfd: wp: support swap and page migration 2020-04-07 10:43:39 -07:00
mincore.c mm: pagewalk: add 'depth' parameter to pte_hole 2020-02-04 03:05:25 +00:00
mlock.c
mm_init.c mm/mm_init.c: clean code. Use BUILD_BUG_ON when comparing compile time constant 2020-04-07 10:43:41 -07:00
mmap.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
mmu_context.c
mmu_gather.c asm-generic/tlb: provide MMU_GATHER_TABLE_FREE 2020-02-04 03:05:26 +00:00
mmu_notifier.c mm/mmu_notifier: silence PROVE_RCU_LIST warnings 2020-03-21 18:56:06 -07:00
mmzone.c
mprotect.c userfaultfd: wp: support swap and page migration 2020-04-07 10:43:39 -07:00
mremap.c mm/mremap: add MREMAP_DONTUNMAP to mremap() 2020-04-02 09:35:30 -07:00
msync.c
nommu.c x86/mm: split vmalloc_sync_all() 2020-03-21 18:56:06 -07:00
oom_kill.c mm, oom: dump stack of victim when reaping failed 2020-01-31 10:30:38 -08:00
page_alloc.c mm: introduce Reported pages 2020-04-07 10:43:38 -07:00
page_counter.c mm, memcg: prevent memory.min load/store tearing 2020-04-02 09:35:29 -07:00
page_ext.c mm/page_ext.c: drop pfn_present() check when onlining 2020-04-07 10:43:40 -07:00
page_idle.c
page_io.c fs: Enable bmap() function to properly return errors 2020-02-03 08:05:37 -05:00
page_isolation.c mm: add function __putback_isolated_page 2020-04-07 10:43:38 -07:00
page_owner.c
page_poison.c
page_reporting.c mm/page_reporting: add budget limit on how many pages can be reported per pass 2020-04-07 10:43:39 -07:00
page_reporting.h mm: introduce Reported pages 2020-04-07 10:43:38 -07:00
page_vma_mapped.c mm/page_vma_mapped.c: explicitly compare pfn for normal, hugetlbfs and THP page 2020-01-31 10:30:38 -08:00
page-writeback.c mm/gup/writeback: add callbacks for inaccessible pages 2020-04-02 09:35:27 -07:00
pagewalk.c x86: mm: avoid allocating struct mm_struct on the stack 2020-02-04 03:05:25 +00:00
percpu-internal.h
percpu-km.c
percpu-stats.c percpu: update copyright emails to dennis@kernel.org 2020-04-01 10:09:12 -07:00
percpu-vm.c
percpu.c percpu: update copyright emails to dennis@kernel.org 2020-04-01 10:09:12 -07:00
pgtable-generic.c asm-generic/mm: stub out p{4,u}d_clear_bad() if __PAGETABLE_P{4,U}D_FOLDED 2019-12-01 06:29:19 -08:00
process_vm_access.c mm: docs: Fix a comment in process_vm_rw_core 2020-03-25 10:04:01 -05:00
ptdump.c x86: mm: avoid allocating struct mm_struct on the stack 2020-02-04 03:05:25 +00:00
readahead.c
rmap.c mm: prevent a warning when casting void* -> enum 2020-04-07 10:43:41 -07:00
rodata_test.c
shmem.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
shuffle.c mm: adjust shuffle code to allow for future coalescing 2020-04-07 10:43:38 -07:00
shuffle.h mm: adjust shuffle code to allow for future coalescing 2020-04-07 10:43:38 -07:00
slab_common.c proc: faster open/read/close with "permanent" files 2020-04-07 10:43:42 -07:00
slab.c mm, debug_pagealloc: don't rely on static keys too early 2020-01-13 18:19:02 -08:00
slab.h mm: kmem: rename (__)memcg_kmem_(un)charge_memcg() to __memcg_kmem_(un)charge() 2020-04-02 09:35:28 -07:00
slob.c
slub.c mm/slub: add missing annotation for put_map() 2020-04-07 10:43:41 -07:00
sparse-vmemmap.c
sparse.c mm/sparse.c: move subsection_map related functions together 2020-04-07 10:43:40 -07:00
swap_cgroup.c
swap_slots.c mm/swap_slots.c: assign|reset cache slot by value directly 2020-04-02 09:35:27 -07:00
swap_state.c mm/swap_state.c: use the same way to count page in [add_to|delete_from]_swap_cache 2020-04-02 09:35:28 -07:00
swap.c mm: huge tmpfs: try to split_huge_page() when punching hole 2020-04-07 10:43:41 -07:00
swapfile.c proc: faster open/read/close with "permanent" files 2020-04-07 10:43:42 -07:00
truncate.c
usercopy.c
userfaultfd.c userfaultfd: wp: support write protection for userfault vma range 2020-04-07 10:43:39 -07:00
util.c mm/mmap.c: rb_parent is not necessary in __vma_link_list() 2019-12-01 06:29:19 -08:00
vmacache.c
vmalloc.c mm/vmalloc: fix a typo in comment 2020-04-07 10:43:38 -07:00
vmpressure.c mm: vmpressure: use mem_cgroup_is_root API 2020-04-02 09:35:31 -07:00
vmscan.c mm: code cleanup for MADV_FREE 2020-04-07 10:43:38 -07:00
vmstat.c mm, thp: track fallbacks due to failed memcg charges separately 2020-04-07 10:43:38 -07:00
workingset.c mm: vmscan: detect file thrashing at the reclaim root 2019-12-01 12:59:07 -08:00
z3fold.c mm/z3fold.c: do not include rwlock.h directly 2020-03-06 07:06:09 -06:00
zbud.c
zpool.c
zsmalloc.c mm: use fallthrough; 2020-04-07 10:43:41 -07:00
zswap.c mm/zswap: allow setting default status, compressor and allocator in Kconfig 2020-04-07 10:43:41 -07:00