Konstantin Khlebnikov 1e426fe282 mm: use down_read_killable for locking mmap_sem in access_remote_vm ... This function is used by ptrace and proc files like /proc/pid/cmdline and /proc/pid/environ. Access_remote_vm never returns error codes, all errors are ignored and only size of successfully read data is returned. So, if current task was killed we'll simply return 0 (bytes read). Mmap_sem could be locked for a long time or forever if something goes wrong. Using a killable lock permits cleanup of stuck tasks and simplifies investigation. Link: http://lkml.kernel.org/r/156007494202.3335.16782303099589302087.stgit@buzz Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: Michal Koutný <mkoutny@suse.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Kirill Tkhai <ktkhai@virtuozzo.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Roman Gushchin <guro@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-07-12 11:05:47 -07:00
..
kasan	mm/kasan: change kasan_check_{read,write} to return boolean	2019-07-12 11:05:42 -07:00
backing-dev.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
balloon_compaction.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
cleancache.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482	2019-06-19 17:09:52 +02:00
cma_debug.c	mm/cma_debug.c: fix the break condition in cma_maxchunk_get()	2019-05-14 09:47:45 -07:00
cma.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 98	2019-05-24 17:37:54 +02:00
cma.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
compaction.c	mm, compaction: make sure we isolate a valid PFN	2019-06-01 15:51:32 -07:00
debug_page_ref.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
debug.c	mm: update references to page _refcount	2019-05-14 19:52:47 -07:00
dmapool.c	mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options	2019-07-12 11:05:46 -07:00
early_ioremap.c	mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep	2017-12-11 14:54:44 +01:00
fadvise.c	vfs: implement readahead(2) using POSIX_FADV_WILLNEED	2018-08-30 20:01:32 +02:00
failslab.c	mm/failslab.c: by default, do not fail allocations with direct reclaim only	2019-07-12 11:05:43 -07:00
filemap.c	mm/filemap.c: correct the comment about VM_FAULT_RETRY	2019-07-12 11:05:43 -07:00
frame_vector.c	mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'	2017-12-14 16:00:48 -08:00
frontswap.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482	2019-06-19 17:09:52 +02:00
gup_benchmark.c	mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM	2019-05-14 09:47:45 -07:00
gup.c	mm/gup.c: mark undo_dev_pagemap as __maybe_unused	2019-07-12 11:05:45 -07:00
highmem.c	mm: convert totalram_pages and totalhigh_pages variables to atomic	2018-12-28 12:11:47 -08:00
hmm.c	mm/devm_memremap_pages: fix final page put race	2019-06-13 17:34:56 -10:00
huge_memory.c	Revert "mm: page cache: store only head pages in i_pages"	2019-07-05 19:55:18 -07:00
hugetlb_cgroup.c	mm: rename page_counter's count/limit into usage/max	2018-06-07 17:34:35 -07:00
hugetlb.c	mm: hugetlb: soft-offline: dissolve_free_huge_page() return zero on !PageHuge	2019-06-29 16:43:45 +08:00
hwpoison-inject.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
init-mm.c	mm: Allocate the mm_cpumask (mm->cpu_bitmap[]) dynamically based on nr_cpu_ids	2018-07-17 09:35:30 +02:00
internal.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
interval_tree.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248	2019-06-19 17:09:08 +02:00
Kconfig	mm: move the powerpc hugepd code to mm/gup.c	2019-07-12 11:05:45 -07:00
Kconfig.debug	mm, debug_pagealloc: use a page type instead of page_ext flag	2019-07-12 11:05:43 -07:00
khugepaged.c	Revert "mm: page cache: store only head pages in i_pages"	2019-07-05 19:55:18 -07:00
kmemleak-test.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333	2019-06-05 17:37:06 +02:00
kmemleak.c	mm/kmemleak.c: change error at _write when kmemleak is disabled	2019-07-12 11:05:42 -07:00
ksm.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482	2019-06-19 17:09:52 +02:00
list_lru.c	mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages	2019-07-12 11:05:44 -07:00
maccess.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
madvise.c	mm/mmu_notifier: use correct mmu_notifier events for each invalidation	2019-05-14 09:47:49 -07:00
Makefile	mm: consolidate the get_user_pages* implementations	2019-07-12 11:05:45 -07:00
memblock.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
memcontrol.c	mm: memcg/slab: reparent memcg kmem_caches on cgroup removal	2019-07-12 11:05:44 -07:00
memfd.c	Revert "mm: page cache: store only head pages in i_pages"	2019-07-05 19:55:18 -07:00
memory_hotplug.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
memory-failure.c	Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2019-07-08 21:48:15 -07:00
memory.c	mm: use down_read_killable for locking mmap_sem in access_remote_vm	2019-07-12 11:05:47 -07:00
mempolicy.c	mm/mempolicy.c: fix an incorrect rebind node in mpol_rebind_nodemask	2019-06-29 16:43:44 +08:00
mempool.c	docs/core-api/mm: fix return value descriptions in mm/	2019-03-05 21:07:20 -08:00
memtest.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
migrate.c	Revert "mm: page cache: store only head pages in i_pages"	2019-07-05 19:55:18 -07:00
mincore.c	mm/mincore.c: fix race between swapoff and mincore	2019-07-12 11:05:43 -07:00
mlock.c	mm/mlock.c: change count_mm_mlocked_page_nr return type	2019-06-13 17:34:56 -10:00
mm_init.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
mmap.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
mmu_context.c
mmu_gather.c	mm: mmu_gather: remove __tlb_reset_range() for force flush	2019-06-13 17:34:56 -10:00
mmu_notifier.c	mm/mmu_notifier: use hlist_add_head_rcu()	2019-07-12 11:05:46 -07:00
mmzone.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mprotect.c	mm/mprotect.c: fix compilation warning because of unused 'mm' variable	2019-05-14 09:47:51 -07:00
mremap.c	mm/mmu_notifier: contextual information for event triggering invalidation	2019-05-14 09:47:49 -07:00
msync.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
nommu.c	mm: use down_read_killable for locking mmap_sem in access_remote_vm	2019-07-12 11:05:47 -07:00
oom_kill.c	mm/oom_kill.c: fix uninitialized oc->constraint	2019-06-29 16:43:45 +08:00
page_alloc.c	mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options	2019-07-12 11:05:46 -07:00
page_counter.c	memcg: introduce memory.min	2018-06-07 17:34:36 -07:00
page_ext.c	mm, debug_pagealloc: use a page type instead of page_ext flag	2019-07-12 11:05:43 -07:00
page_idle.c	mm/page_idle.c: fix oops because end_pfn is larger than max_pfn	2019-06-29 16:43:45 +08:00
page_io.c	mm, swap: use rbtree for swap_extent	2019-07-12 11:05:43 -07:00
page_isolation.c	mm/page_isolation.c: change the prototype of undo_isolate_page_range()	2019-07-12 11:05:43 -07:00
page_owner.c	mm/page_owner: Simplify stack trace handling	2019-04-29 12:37:50 +02:00
page_poison.c	page_poison: play nicely with KASAN	2019-03-05 21:07:13 -08:00
page_vma_mapped.c	mm/rmap: map_pte() was not handling private ZONE_DEVICE page properly	2018-10-31 08:54:11 -07:00
page-writeback.c	mm: remove the account_page_dirtied export	2019-07-12 11:05:42 -07:00
pagewalk.c	mm: kernel-doc: add missing parameter descriptions	2018-04-05 21:36:27 -07:00
percpu-internal.h	percpu: convert chunk hints to be based on pcpu_block_md	2019-03-13 12:25:31 -07:00
percpu-km.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
percpu-stats.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
percpu-vm.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
percpu.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
pgtable-generic.c	x86/mm: Page size aware flush_tlb_mm_range()	2018-10-09 16:51:11 +02:00
process_vm_access.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
quicklist.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
readahead.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
rmap.c	mm/rmap.c: use the pra.mapcount to do the check	2019-05-14 09:47:49 -07:00
rodata_test.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
shmem.c	Revert "mm: page cache: store only head pages in i_pages"	2019-07-05 19:55:18 -07:00
shuffle.c	mm: maintain randomization of page free lists	2019-05-14 19:52:48 -07:00
shuffle.h	mm: maintain randomization of page free lists	2019-05-14 19:52:48 -07:00
slab_common.c	mm, memcg: add a memcg_slabinfo debugfs file	2019-07-12 11:05:44 -07:00
slab.c	mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options	2019-07-12 11:05:46 -07:00
slab.h	mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options	2019-07-12 11:05:46 -07:00
slob.c	mm/slab: refactor common ksize KASAN logic into slab_common.c	2019-07-12 11:05:42 -07:00
slub.c	mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options	2019-07-12 11:05:46 -07:00
sparse-vmemmap.c	mm: remove include/linux/bootmem.h	2018-10-31 08:54:16 -07:00
sparse.c	mm/sparse.c: clean up obsolete code comment	2019-05-14 09:47:48 -07:00
swap_cgroup.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
swap_slots.c	mm, swap, get_swap_pages: use entry_size instead of cluster in parameter	2018-08-22 10:52:44 -07:00
swap_state.c	mm/swap_state.c: simplify total_swapcache_pages() with get_swap_device()	2019-07-12 11:05:43 -07:00
swap.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
swapfile.c	mm, swap: use rbtree for swap_extent	2019-07-12 11:05:43 -07:00
truncate.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
usercopy.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
userfaultfd.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499	2019-06-19 17:09:53 +02:00
util.c	mm: consolidate the get_user_pages* implementations	2019-07-12 11:05:45 -07:00
vmacache.c	mm: get rid of vmacache_flush_all() entirely	2018-09-13 15:18:04 -10:00
vmalloc.c	mm/vmalloc.c: spelling> s/informaion/information/	2019-07-12 11:05:46 -07:00
vmpressure.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
vmscan.c	mm: vmscan: correct some vmscan counters for THP swapout	2019-07-12 11:05:46 -07:00
vmstat.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
workingset.c	mm: memcontrol: make cgroup stats and events query API explicitly local	2019-05-14 19:52:53 -07:00
z3fold.c	mm/z3fold.c: lock z3fold page before __SetPageMovable()	2019-07-12 11:05:40 -07:00
zbud.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
zpool.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
zsmalloc.c	mm/zsmalloc.c: fix fall-through annotation	2018-10-26 16:26:35 -07:00
zswap.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00