https://github.com/torvalds/linux
Revision 1a62b18d51e5c5ecc0345c85bb9fef870ab721ed authored by Qian Cai on 19 April 2019, 00:49:55 UTC, committed by Linus Torvalds on 19 April 2019, 16:46:04 UTC
Commit 51dedad06b5f ("kasan, slab: make freelist stored without tags") calls kasan_reset_tag() for off-slab slab management object leading to freelist being stored non-tagged. However, cache_grow_begin() calls alloc_slabmgmt() which calls kmem_cache_alloc_node() assigns a tag for the address and stores it in the shadow address. As the result, it causes endless errors below during boot due to drain_freelist() -> slab_destroy() -> kasan_slab_free() which compares already untagged freelist against the stored tag in the shadow address. Since off-slab slab management object freelist is such a special case, just store it tagged. Non-off-slab management object freelist is still stored untagged which has not been assigned a tag and should not cause any other troubles with this inconsistency. BUG: KASAN: double-free or invalid-free in slab_destroy+0x84/0x88 Pointer tag: [ff], memory tag: [99] CPU: 0 PID: 1376 Comm: kworker/0:4 Tainted: G W 5.1.0-rc3+ #8 Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.0.6 07/10/2018 Workqueue: cgroup_destroy css_killed_work_fn Call trace: print_address_description+0x74/0x2a4 kasan_report_invalid_free+0x80/0xc0 __kasan_slab_free+0x204/0x208 kasan_slab_free+0xc/0x18 kmem_cache_free+0xe4/0x254 slab_destroy+0x84/0x88 drain_freelist+0xd0/0x104 __kmem_cache_shrink+0x1ac/0x224 __kmemcg_cache_deactivate+0x1c/0x28 memcg_deactivate_kmem_caches+0xa0/0xe8 memcg_offline_kmem+0x8c/0x3d4 mem_cgroup_css_offline+0x24c/0x290 css_killed_work_fn+0x154/0x618 process_one_work+0x9cc/0x183c worker_thread+0x9b0/0xe38 kthread+0x374/0x390 ret_from_fork+0x10/0x18 Allocated by task 1625: __kasan_kmalloc+0x168/0x240 kasan_slab_alloc+0x18/0x20 kmem_cache_alloc_node+0x1f8/0x3a0 cache_grow_begin+0x4fc/0xa24 cache_alloc_refill+0x2f8/0x3e8 kmem_cache_alloc+0x1bc/0x3bc sock_alloc_inode+0x58/0x334 alloc_inode+0xb8/0x164 new_inode_pseudo+0x20/0xec sock_alloc+0x74/0x284 __sock_create+0xb0/0x58c sock_create+0x98/0xb8 __sys_socket+0x60/0x138 __arm64_sys_socket+0xa4/0x110 el0_svc_handler+0x2c0/0x47c el0_svc+0x8/0xc Freed by task 1625: __kasan_slab_free+0x114/0x208 kasan_slab_free+0xc/0x18 kfree+0x1a8/0x1e0 single_release+0x7c/0x9c close_pdeo+0x13c/0x43c proc_reg_release+0xec/0x108 __fput+0x2f8/0x784 ____fput+0x1c/0x28 task_work_run+0xc0/0x1b0 do_notify_resume+0xb44/0x1278 work_pending+0x8/0x10 The buggy address belongs to the object at ffff809681b89e00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff809681b89e00, ffff809681b89e80) The buggy address belongs to the page: page:ffff7fe025a06e00 count:1 mapcount:0 mapping:01ff80082000fb00 index:0xffff809681b8fe04 flags: 0x17ffffffc000200(slab) raw: 017ffffffc000200 ffff7fe025a06d08 ffff7fe022ef7b88 01ff80082000fb00 raw: ffff809681b8fe04 ffff809681b80000 00000001000000e0 0000000000000000 page dumped because: kasan: bad access detected page allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE) prep_new_page+0x4e0/0x5e0 get_page_from_freelist+0x4ce8/0x50d4 __alloc_pages_nodemask+0x738/0x38b8 cache_grow_begin+0xd8/0xa24 ____cache_alloc_node+0x14c/0x268 __kmalloc+0x1c8/0x3fc ftrace_free_mem+0x408/0x1284 ftrace_free_init_mem+0x20/0x28 kernel_init+0x24/0x548 ret_from_fork+0x10/0x18 Memory state around the buggy address: ffff809681b89c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff809681b89d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff809681b89e00: 99 99 99 99 99 99 99 99 fe fe fe fe fe fe fe fe ^ ffff809681b89f00: 43 43 43 43 43 fe fe fe fe fe fe fe fe fe fe fe ffff809681b8a000: 6d fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe Link: http://lkml.kernel.org/r/20190403022858.97584-1-cai@lca.pw Fixes: 51dedad06b5f ("kasan, slab: make freelist stored without tags") Signed-off-by: Qian Cai <cai@lca.pw> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 6d906f9
Tip revision: 1a62b18d51e5c5ecc0345c85bb9fef870ab721ed authored by Qian Cai on 19 April 2019, 00:49:55 UTC
slab: store tagged freelist for off-slab slabmgmt
slab: store tagged freelist for off-slab slabmgmt
Tip revision: 1a62b18
File | Mode | Size |
---|---|---|
kasan | ||
Kconfig | -rw-r--r-- | 24.6 KB |
Kconfig.debug | -rw-r--r-- | 4.3 KB |
Makefile | -rw-r--r-- | 3.5 KB |
backing-dev.c | -rw-r--r-- | 27.0 KB |
balloon_compaction.c | -rw-r--r-- | 5.5 KB |
cleancache.c | -rw-r--r-- | 9.9 KB |
cma.c | -rw-r--r-- | 14.1 KB |
cma.h | -rw-r--r-- | 573 bytes |
cma_debug.c | -rw-r--r-- | 4.5 KB |
compaction.c | -rw-r--r-- | 75.0 KB |
debug.c | -rw-r--r-- | 5.9 KB |
debug_page_ref.c | -rw-r--r-- | 1.4 KB |
dmapool.c | -rw-r--r-- | 13.9 KB |
early_ioremap.c | -rw-r--r-- | 6.8 KB |
fadvise.c | -rw-r--r-- | 5.3 KB |
failslab.c | -rw-r--r-- | 1.4 KB |
filemap.c | -rw-r--r-- | 95.4 KB |
frame_vector.c | -rw-r--r-- | 6.4 KB |
frontswap.c | -rw-r--r-- | 14.2 KB |
gup.c | -rw-r--r-- | 55.4 KB |
gup_benchmark.c | -rw-r--r-- | 2.7 KB |
highmem.c | -rw-r--r-- | 11.7 KB |
hmm.c | -rw-r--r-- | 33.2 KB |
huge_memory.c | -rw-r--r-- | 82.5 KB |
hugetlb.c | -rw-r--r-- | 133.2 KB |
hugetlb_cgroup.c | -rw-r--r-- | 10.9 KB |
hwpoison-inject.c | -rw-r--r-- | 3.2 KB |
init-mm.c | -rw-r--r-- | 1.2 KB |
internal.h | -rw-r--r-- | 17.3 KB |
interval_tree.c | -rw-r--r-- | 3.1 KB |
khugepaged.c | -rw-r--r-- | 48.1 KB |
kmemleak-test.c | -rw-r--r-- | 3.2 KB |
kmemleak.c | -rw-r--r-- | 60.5 KB |
ksm.c | -rw-r--r-- | 89.4 KB |
list_lru.c | -rw-r--r-- | 14.6 KB |
maccess.c | -rw-r--r-- | 3.1 KB |
madvise.c | -rw-r--r-- | 22.9 KB |
memblock.c | -rw-r--r-- | 54.9 KB |
memcontrol.c | -rw-r--r-- | 170.3 KB |
memfd.c | -rw-r--r-- | 7.8 KB |
memory-failure.c | -rw-r--r-- | 52.1 KB |
memory.c | -rw-r--r-- | 124.5 KB |
memory_hotplug.c | -rw-r--r-- | 48.7 KB |
mempolicy.c | -rw-r--r-- | 72.4 KB |
mempool.c | -rw-r--r-- | 15.8 KB |
memtest.c | -rw-r--r-- | 2.8 KB |
migrate.c | -rw-r--r-- | 76.8 KB |
mincore.c | -rw-r--r-- | 6.7 KB |
mlock.c | -rw-r--r-- | 22.6 KB |
mm_init.c | -rw-r--r-- | 4.8 KB |
mmap.c | -rw-r--r-- | 99.9 KB |
mmu_context.c | -rw-r--r-- | 1.3 KB |
mmu_gather.c | -rw-r--r-- | 6.3 KB |
mmu_notifier.c | -rw-r--r-- | 11.5 KB |
mmzone.c | -rw-r--r-- | 2.4 KB |
mprotect.c | -rw-r--r-- | 15.6 KB |
mremap.c | -rw-r--r-- | 19.3 KB |
msync.c | -rw-r--r-- | 2.6 KB |
nommu.c | -rw-r--r-- | 47.6 KB |
oom_kill.c | -rw-r--r-- | 30.3 KB |
page-writeback.c | -rw-r--r-- | 84.4 KB |
page_alloc.c | -rw-r--r-- | 232.7 KB |
page_counter.c | -rw-r--r-- | 6.6 KB |
page_ext.c | -rw-r--r-- | 11.0 KB |
page_idle.c | -rw-r--r-- | 5.5 KB |
page_io.c | -rw-r--r-- | 10.5 KB |
page_isolation.c | -rw-r--r-- | 9.3 KB |
page_owner.c | -rw-r--r-- | 15.1 KB |
page_poison.c | -rw-r--r-- | 3.0 KB |
page_vma_mapped.c | -rw-r--r-- | 7.6 KB |
pagewalk.c | -rw-r--r-- | 8.7 KB |
percpu-internal.h | -rw-r--r-- | 5.9 KB |
percpu-km.c | -rw-r--r-- | 3.0 KB |
percpu-stats.c | -rw-r--r-- | 5.7 KB |
percpu-vm.c | -rw-r--r-- | 10.3 KB |
percpu.c | -rw-r--r-- | 85.7 KB |
pgtable-generic.c | -rw-r--r-- | 5.3 KB |
process_vm_access.c | -rw-r--r-- | 10.0 KB |
quicklist.c | -rw-r--r-- | 2.4 KB |
readahead.c | -rw-r--r-- | 16.5 KB |
rmap.c | -rw-r--r-- | 53.7 KB |
rodata_test.c | -rw-r--r-- | 1.4 KB |
shmem.c | -rw-r--r-- | 104.8 KB |
slab.c | -rw-r--r-- | 111.2 KB |
slab.h | -rw-r--r-- | 14.6 KB |
slab_common.c | -rw-r--r-- | 39.1 KB |
slob.c | -rw-r--r-- | 16.2 KB |
slub.c | -rw-r--r-- | 143.1 KB |
sparse-vmemmap.c | -rw-r--r-- | 6.6 KB |
sparse.c | -rw-r--r-- | 21.4 KB |
swap.c | -rw-r--r-- | 28.6 KB |
swap_cgroup.c | -rw-r--r-- | 5.2 KB |
swap_slots.c | -rw-r--r-- | 9.4 KB |
swap_state.c | -rw-r--r-- | 22.4 KB |
swapfile.c | -rw-r--r-- | 91.6 KB |
truncate.c | -rw-r--r-- | 26.4 KB |
usercopy.c | -rw-r--r-- | 9.5 KB |
userfaultfd.c | -rw-r--r-- | 16.0 KB |
util.c | -rw-r--r-- | 20.0 KB |
vmacache.c | -rw-r--r-- | 2.7 KB |
vmalloc.c | -rw-r--r-- | 70.9 KB |
vmpressure.c | -rw-r--r-- | 13.9 KB |
vmscan.c | -rw-r--r-- | 122.8 KB |
vmstat.c | -rw-r--r-- | 51.6 KB |
workingset.c | -rw-r--r-- | 19.1 KB |
z3fold.c | -rw-r--r-- | 30.6 KB |
zbud.c | -rw-r--r-- | 18.2 KB |
zpool.c | -rw-r--r-- | 10.7 KB |
zsmalloc.c | -rw-r--r-- | 60.4 KB |
zswap.c | -rw-r--r-- | 34.7 KB |
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