linux/mm
Wang Cheng 018160ad31 mm/mempolicy: fix uninit-value in mpol_rebind_policy()
mpol_set_nodemask()(mm/mempolicy.c) does not set up nodemask when
pol->mode is MPOL_LOCAL.  Check pol->mode before access
pol->w.cpuset_mems_allowed in mpol_rebind_policy()(mm/mempolicy.c).

BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:352 [inline]
BUG: KMSAN: uninit-value in mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368
 mpol_rebind_policy mm/mempolicy.c:352 [inline]
 mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368
 cpuset_change_task_nodemask kernel/cgroup/cpuset.c:1711 [inline]
 cpuset_attach+0x787/0x15e0 kernel/cgroup/cpuset.c:2278
 cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2515
 cgroup_migrate kernel/cgroup/cgroup.c:2771 [inline]
 cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2804
 __cgroup1_procs_write+0x5cc/0x7a0 kernel/cgroup/cgroup-v1.c:520
 cgroup1_tasks_write+0x94/0xb0 kernel/cgroup/cgroup-v1.c:539
 cgroup_file_write+0x4c2/0x9e0 kernel/cgroup/cgroup.c:3852
 kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x1318/0x2030 fs/read_write.c:590
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0xdb/0x120 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:524 [inline]
 slab_alloc_node mm/slub.c:3251 [inline]
 slab_alloc mm/slub.c:3259 [inline]
 kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3264
 mpol_new mm/mempolicy.c:293 [inline]
 do_set_mempolicy+0x421/0xb70 mm/mempolicy.c:853
 kernel_set_mempolicy mm/mempolicy.c:1504 [inline]
 __do_sys_set_mempolicy mm/mempolicy.c:1510 [inline]
 __se_sys_set_mempolicy+0x44c/0xb60 mm/mempolicy.c:1507
 __x64_sys_set_mempolicy+0xd8/0x110 mm/mempolicy.c:1507
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

KMSAN: uninit-value in mpol_rebind_task (2)
https://syzkaller.appspot.com/bug?id=d6eb90f952c2a5de9ea718a1b873c55cb13b59dc

This patch seems to fix below bug too.
KMSAN: uninit-value in mpol_rebind_mm (2)
https://syzkaller.appspot.com/bug?id=f2fecd0d7013f54ec4162f60743a2b28df40926b

The uninit-value is pol->w.cpuset_mems_allowed in mpol_rebind_policy().
When syzkaller reproducer runs to the beginning of mpol_new(),

	    mpol_new() mm/mempolicy.c
	  do_mbind() mm/mempolicy.c
	kernel_mbind() mm/mempolicy.c

`mode` is 1(MPOL_PREFERRED), nodes_empty(*nodes) is `true` and `flags`
is 0. Then

	mode = MPOL_LOCAL;
	...
	policy->mode = mode;
	policy->flags = flags;

will be executed. So in mpol_set_nodemask(),

	    mpol_set_nodemask() mm/mempolicy.c
	  do_mbind()
	kernel_mbind()

pol->mode is 4 (MPOL_LOCAL), that `nodemask` in `pol` is not initialized,
which will be accessed in mpol_rebind_policy().

Link: https://lkml.kernel.org/r/20220512123428.fq3wofedp6oiotd4@ppc.localdomain
Signed-off-by: Wang Cheng <wanngchenng@gmail.com>
Reported-by: <syzbot+217f792c92599518a2ab@syzkaller.appspotmail.com>
Tested-by: <syzbot+217f792c92599518a2ab@syzkaller.appspotmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-05-19 14:08:54 -07:00
..
damon mm/damon/reclaim: use resource_size function on resource object 2022-05-13 07:20:18 -07:00
kasan kasan: give better names to shadow values 2022-05-13 07:20:19 -07:00
kfence kfence: enable check kfence canary on panic via boot param 2022-05-13 07:20:06 -07:00
backing-dev.c remove congestion tracking framework 2022-03-22 15:57:01 -07:00
balloon_compaction.c mm/balloon_compaction: make balloon page compaction callbacks static 2022-03-28 16:52:57 -04:00
bootmem_info.c bootmem: Use page->index instead of page->freelist 2022-01-06 12:27:03 +01:00
cma_debug.c
cma_sysfs.c
cma.c mm/cma: provide option to opt out from exposing pages on activation failure 2022-03-22 15:57:09 -07:00
cma.h mm/cma: provide option to opt out from exposing pages on activation failure 2022-03-22 15:57:09 -07:00
compaction.c mm, compaction: fast_find_migrateblock() should return pfn in the target zone 2022-05-13 16:48:57 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE 2022-05-09 18:20:45 -07:00
debug.c mm: unexport page_init_poison 2022-03-24 19:06:45 -07:00
dmapool.c mm/dmapool.c: revert "make dma pool to use kmalloc_node" 2022-01-15 16:30:28 +02:00
early_ioremap.c mm/early_ioremap: declare early_memremap_pgprot_adjust() 2022-03-22 15:57:11 -07:00
fadvise.c remove inode_congested() 2022-03-22 15:57:01 -07:00
failslab.c
filemap.c mm: teach core mm about pte markers 2022-05-13 07:20:09 -07:00
folio-compat.c mm/rmap: Convert rmap_walk() to take a folio 2022-03-21 13:01:35 -04:00
frontswap.c frontswap: remove support for multiple ops 2022-01-22 08:33:38 +02:00
gup_test.c
gup_test.h
gup.c mm/gup: fix comments to pin_user_pages_*() 2022-05-09 18:20:47 -07:00
highmem.c highmem: fix checks in __kmap_local_sched_{in,out} 2022-04-08 14:20:36 -10:00
hmm.c mm: teach core mm about pte markers 2022-05-13 07:20:09 -07:00
huge_memory.c mm: khugepaged: make khugepaged_enter() void function 2022-05-19 14:08:49 -07:00
hugetlb_cgroup.c hugetlb: add hugetlb.*.numa_stat file 2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl 2022-05-13 16:48:56 -07:00
hugetlb_vmemmap.h mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 2022-04-28 23:16:15 -07:00
hugetlb.c mm/hugetlb: handle uffd-wp during fork() 2022-05-13 07:20:11 -07:00
hwpoison-inject.c mm/hwpoison: disable hwpoison filter during removing 2022-05-13 07:20:19 -07:00
init-mm.c kernel/fork: Initialize mm's PASID 2022-02-14 19:51:47 +01:00
internal.h mm/memory-failure.c: move clear_hwpoisoned_pages 2022-05-13 07:20:19 -07:00
interval_tree.c
io-mapping.c
ioremap.c mm: move ioremap_page_range to vmalloc.c 2021-09-08 11:50:24 -07:00
Kconfig mm: Kconfig: simplify zswap configuration 2022-05-19 14:08:53 -07:00
Kconfig.debug mm: page table check 2022-01-15 16:30:28 +02:00
khugepaged.c mm: khugepaged: introduce khugepaged_enter_vma() helper 2022-05-19 14:08:50 -07:00
kmemleak.c mm: kmemleak: take a full lowmem check in kmemleak_*_phys() 2022-04-15 14:49:56 -07:00
ksm.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
list_lru.c mm/list_lru.c: revert "mm/list_lru: optimize memcg_reparent_list_lru_node()" 2022-04-08 14:20:36 -10:00
maccess.c asm-generic updates for 5.18 2022-03-23 18:03:08 -07:00
madvise.c mm: submit multipage reads for SWP_FS_OPS swap-space 2022-05-09 18:20:49 -07:00
Makefile mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 2022-04-28 23:16:15 -07:00
mapping_dirty_helpers.c mm: move tlb_flush_pending inline helpers to mm_inline.h 2022-01-15 16:30:27 +02:00
memblock.c memblock: test suite and a small cleanup 2022-03-27 13:36:06 -07:00
memcontrol.c zswap: memcg accounting 2022-05-19 14:08:53 -07:00
memfd.c memfd: fix F_SEAL_WRITE after shmem huge page allocated 2022-03-05 11:08:32 -08:00
memory_hotplug.c mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl 2022-05-13 16:48:56 -07:00
memory-failure.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
memory.c mm/swap: avoid calling swp_swap_info when try to check SWP_STABLE_WRITES 2022-05-19 14:08:51 -07:00
mempolicy.c mm/mempolicy: fix uninit-value in mpol_rebind_policy() 2022-05-19 14:08:54 -07:00
mempool.c mm: remove spurious blkdev.h includes 2021-10-18 06:17:01 -06:00
memremap.c mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages 2022-05-09 18:20:44 -07:00
memtest.c
migrate_device.c mm: remember exclusively mapped anonymous pages with PG_anon_exclusive 2022-05-09 18:20:44 -07:00
migrate.c mm/migrate: convert move_to_new_page() into move_to_new_folio() 2022-05-13 07:20:17 -07:00
mincore.c mm: teach core mm about pte markers 2022-05-13 07:20:09 -07:00
mlock.c mm/munlock: protect the per-CPU pagevec by a local_lock_t 2022-04-01 11:46:09 -07:00
mm_init.c
mmap_lock.c mm: mmap_lock: fix disabling preemption directly 2021-07-23 17:43:28 -07:00
mmap.c mm: mmap: register suitable readonly file vmas for khugepaged 2022-05-19 14:08:50 -07:00
mmu_gather.c mm/mmu_gather: limit free batch count and add schedule point in tlb_batch_pages_flush 2022-04-28 23:16:12 -07:00
mmu_notifier.c mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove() 2022-04-21 20:01:10 -07:00
mmzone.c Folio changes for 5.18 2022-03-22 17:03:12 -07:00
mprotect.c mm/hugetlb: handle UFFDIO_WRITEPROTECT 2022-05-13 07:20:11 -07:00
mremap.c mm: hugetlb: considering PMD sharing when flushing cache/TLBs 2022-05-13 07:20:07 -07:00
msync.c
nommu.c no-MMU: expose vmalloc_huge() for alloc_large_system_hash() 2022-04-25 10:11:49 -07:00
oom_kill.c oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup 2022-04-21 20:01:10 -07:00
page_alloc.c mm/memory-failure.c: simplify num_poisoned_pages_dec 2022-05-13 07:20:19 -07:00
page_counter.c mm/page_counter: remove an incorrect call to propagate_protected_usage() 2022-01-15 16:30:27 +02:00
page_ext.c mm: use for_each_online_node and node_online instead of open coding 2022-04-29 14:36:58 -07:00
page_idle.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
page_io.c MM: handle THP in swap_*page_fs() - count_vm_events() 2022-05-09 18:20:49 -07:00
page_isolation.c mm: page_isolation: enable arbitrary range page isolation. 2022-05-13 07:20:13 -07:00
page_owner.c mm/page_owner: use strscpy() instead of strlcpy() 2022-05-13 07:20:19 -07:00
page_poison.c
page_reporting.c mm/page_reporting: allow driver to specify reporting order 2021-06-29 10:53:47 -07:00
page_reporting.h mm/page_reporting: export reporting order as module parameter 2021-06-29 10:53:47 -07:00
page_table_check.c mm: page_table_check: move pxx_user_accessible_page into x86 2022-05-13 07:20:17 -07:00
page_vma_mapped.c mm: pvmw: add support for walking devmap pages 2022-04-28 23:16:10 -07:00
page-writeback.c mm: rework calculation of bdi_min_ratio in bdi_set_min_ratio 2022-04-28 23:15:57 -07:00
pagewalk.c mm: pagewalk: fix walk for hugepage tables 2021-06-29 10:53:49 -07:00
percpu-internal.h percpu: improve percpu_alloc_percpu event trace 2022-05-13 07:20:18 -07:00
percpu-km.c percpu: flush tlb in pcpu_reclaim_populated() 2021-07-04 18:30:17 +00:00
percpu-stats.c mm: use vmalloc_array and vcalloc for array allocations 2022-03-08 09:30:46 -05:00
percpu-vm.c percpu: flush tlb in pcpu_reclaim_populated() 2021-07-04 18:30:17 +00:00
percpu.c percpu: improve percpu_alloc_percpu event trace 2022-05-13 07:20:18 -07:00
pgalloc-track.h mm: fix typos in comments 2021-05-07 00:26:35 -07:00
pgtable-generic.c mm: avoid unnecessary flush on change_huge_pmd() 2022-05-13 07:20:05 -07:00
process_vm_access.c
ptdump.c mm: sparsemem: use page table lock to protect kernel pmd operations 2022-03-22 15:57:08 -07:00
readahead.c readahead: Update comments 2022-04-01 14:40:42 -04:00
rmap.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
rodata_test.c
secretmem.c mm/secretmem: fix panic when growing a memfd_secret 2022-04-15 14:49:54 -07:00
shmem.c mm: mmap: register suitable readonly file vmas for khugepaged 2022-05-19 14:08:50 -07:00
shuffle.c
shuffle.h mm/shuffle: fix section mismatch warning 2021-05-22 15:09:07 -10:00
slab_common.c mm: make minimum slab alignment a runtime property 2022-05-13 07:20:07 -07:00
slab.c mm: make minimum slab alignment a runtime property 2022-05-13 07:20:07 -07:00
slab.h mm, kfence: support kmem_dump_obj() for KFENCE objects 2022-04-15 14:49:55 -07:00
slob.c mm: make minimum slab alignment a runtime property 2022-05-13 07:20:07 -07:00
slub.c mm, kfence: support kmem_dump_obj() for KFENCE objects 2022-04-15 14:49:55 -07:00
sparse-vmemmap.c mm/sparse-vmemmap: improve memory savings for compound devmaps 2022-04-28 23:16:16 -07:00
sparse.c mm/memory-failure.c: move clear_hwpoisoned_pages 2022-05-13 07:20:19 -07:00
swap_cgroup.c mm: use vmalloc_array and vcalloc for array allocations 2022-03-08 09:30:46 -05:00
swap_slots.c mm/swap: remove buggy cache->nr check in refill_swap_slots_cache 2022-05-19 14:08:51 -07:00
swap_state.c mm/swap: use helper macro __ATTR_RW 2022-05-19 14:08:50 -07:00
swap.c mm/swap: fix the comment of get_kernel_pages 2022-05-19 14:08:52 -07:00
swap.h swap: convert add_to_swap() to take a folio 2022-05-13 07:20:15 -07:00
swapfile.c mm/swap: fix comment about swap extent 2022-05-19 14:08:52 -07:00
truncate.c Filesystem folio changes for 5.18 2022-03-22 18:26:56 -07:00
usercopy.c Merge branch 'akpm' (patches from Andrew) 2022-03-22 16:11:53 -07:00
userfaultfd.c mm/uffd: enable write protection for shmem & hugetlbfs 2022-05-13 07:20:11 -07:00
util.c mm: create new mm/swap.h header file 2022-05-09 18:20:47 -07:00
vmacache.c
vmalloc.c mm/vmalloc: use raw_cpu_ptr() for vmap_block_queue access 2022-05-13 07:20:18 -07:00
vmpressure.c mm/vmpressure: fix data-race with memcg->socket_pressure 2021-11-06 13:30:40 -07:00
vmscan.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
vmstat.c mm: zswap: add basic meminfo and vmstat coverage 2022-05-19 14:08:53 -07:00
workingset.c memcg: sync flush only if periodic flush is delayed 2022-04-21 20:01:09 -07:00
z3fold.c mm/z3fold: remove unneeded PAGE_HEADLESS check in free_handle() 2022-04-28 23:16:06 -07:00
zbud.c mm/zbud: add kerneldoc fields for zbud_pool 2021-07-01 11:06:03 -07:00
zpool.c zpool: remove the list of pools_head 2022-01-15 16:30:31 +02:00
zsmalloc.c zsmalloc: replace get_cpu_var with local_lock 2022-01-22 08:33:37 +02:00
zswap.c zswap: memcg accounting 2022-05-19 14:08:53 -07:00