[syzbot] KASAN: use-after-free Read in mas_next_nentry
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syzbot
Apr 27, 2022, 8:43:24 AM4/27/22
to linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
Hello,
syzbot found the following issue on:
HEAD commit: f02ac5c95dfd Add linux-next specific files for 20220427
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd8db2f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e9256c70f586da8a
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113b4252f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1174bcbaf00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7170d6...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:715 [inline]
BUG: KASAN: use-after-free in mas_next_nentry+0x997/0xaa0 lib/maple_tree.c:4546
Read of size 8 at addr ffff88807811e418 by task syz-executor361/3593
CPU: 1 PID: 3593 Comm: syz-executor361 Not tainted 5.18.0-rc4-next-20220427-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
mas_safe_min lib/maple_tree.c:715 [inline]
mas_next_nentry+0x997/0xaa0 lib/maple_tree.c:4546
mas_next_entry lib/maple_tree.c:4636 [inline]
mas_next+0x1eb/0xc40 lib/maple_tree.c:5723
userfaultfd_register fs/userfaultfd.c:1468 [inline]
userfaultfd_ioctl+0x2527/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4e5785d939
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffff7501a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000031 RCX: 00007f4e5785d939
RDX: 00000000200001c0 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007ffff7501b10 R08: 00007ffff7501a72 R09: 00007ffff7501a72
R10: 00007ffff7501a72 R11: 0000000000000246 R12: 00007ffff7501ae0
R13: 00007f4e578e14e0 R14: 0000000000000003 R15: 00007ffff7501a72
</TASK>
Allocated by task 3592:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
kmem_cache_alloc_bulk+0x39f/0x720 mm/slub.c:3728
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x1df/0x6b0 lib/maple_tree.c:1244
mas_node_count+0x101/0x130 lib/maple_tree.c:1303
mas_split lib/maple_tree.c:3406 [inline]
mas_commit_b_node lib/maple_tree.c:3508 [inline]
mas_wr_modify+0x2505/0x5ac0 lib/maple_tree.c:4251
mas_wr_store_entry.isra.0+0x66e/0x10f0 lib/maple_tree.c:4289
mas_store+0xac/0xf0 lib/maple_tree.c:5523
dup_mmap+0x845/0x1030 kernel/fork.c:687
dup_mm+0x91/0x370 kernel/fork.c:1516
copy_mm kernel/fork.c:1565 [inline]
copy_process+0x3b07/0x6fd0 kernel/fork.c:2226
kernel_clone+0xe7/0xab0 kernel/fork.c:2631
__do_sys_clone+0xc8/0x110 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 3593:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1727 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
slab_free mm/slub.c:3507 [inline]
kmem_cache_free_bulk mm/slub.c:3654 [inline]
kmem_cache_free_bulk+0x2c0/0xb60 mm/slub.c:3641
mt_free_bulk lib/maple_tree.c:157 [inline]
mas_destroy+0x394/0x5c0 lib/maple_tree.c:5685
mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5567
vma_mas_store mm/internal.h:482 [inline]
__vma_adjust+0x6ba/0x18f0 mm/mmap.c:811
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x443/0x530 mm/mmap.c:2259
split_vma+0x9f/0xe0 mm/mmap.c:2292
userfaultfd_register fs/userfaultfd.c:1444 [inline]
userfaultfd_ioctl+0x39f4/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88807811e400
which belongs to the cache maple_node of size 256
The buggy address is located 24 bytes inside of
256-byte region [ffff88807811e400, ffff88807811e500)
The buggy address belongs to the physical page:
page:ffffea0001e04780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7811e
head:ffffea0001e04780 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c4fdc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3286, tgid 3286 (dhcpcd-run-hook), ts 27966983290, free_ts 22717162691
prep_new_page mm/page_alloc.c:2431 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4172
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5393
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1797 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1942
new_slab mm/slub.c:2002 [inline]
___slab_alloc+0x985/0xd90 mm/slub.c:3002
kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244
mas_preallocate+0xfb/0x270 lib/maple_tree.c:5581
__vma_adjust+0x226/0x18f0 mm/mmap.c:742
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x443/0x530 mm/mmap.c:2259
do_mas_align_munmap+0x4f5/0xe80 mm/mmap.c:2375
do_mas_munmap+0x202/0x2c0 mm/mmap.c:2499
mmap_region+0x219/0x1c70 mm/mmap.c:2547
do_mmap+0x825/0xf60 mm/mmap.c:1471
vm_mmap_pgoff+0x1b7/0x290 mm/util.c:488
ksys_mmap_pgoff+0x40d/0x5a0 mm/mmap.c:1517
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1346 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1396
free_unref_page_prepare mm/page_alloc.c:3318 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3413
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3222 [inline]
__kmalloc+0x200/0x350 mm/slub.c:4415
kmalloc include/linux/slab.h:593 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_realpath_nofollow+0xc8/0xe0 security/tomoyo/realpath.c:309
tomoyo_find_next_domain+0x280/0x1f80 security/tomoyo/domain.c:727
tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline]
tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:91
security_bprm_check+0x45/0xa0 security/security.c:865
search_binary_handler fs/exec.c:1718 [inline]
exec_binprm fs/exec.c:1771 [inline]
bprm_execve fs/exec.c:1840 [inline]
bprm_execve+0x732/0x1970 fs/exec.c:1802
do_execveat_common+0x727/0x890 fs/exec.c:1945
do_execve fs/exec.c:2015 [inline]
__do_sys_execve fs/exec.c:2091 [inline]
__se_sys_execve fs/exec.c:2086 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:2086
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88807811e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807811e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807811e400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807811e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807811e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following issue on:
HEAD commit: f02ac5c95dfd Add linux-next specific files for 20220427
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd8db2f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e9256c70f586da8a
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113b4252f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1174bcbaf00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7170d6...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:715 [inline]
BUG: KASAN: use-after-free in mas_next_nentry+0x997/0xaa0 lib/maple_tree.c:4546
Read of size 8 at addr ffff88807811e418 by task syz-executor361/3593
CPU: 1 PID: 3593 Comm: syz-executor361 Not tainted 5.18.0-rc4-next-20220427-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
mas_safe_min lib/maple_tree.c:715 [inline]
mas_next_nentry+0x997/0xaa0 lib/maple_tree.c:4546
mas_next_entry lib/maple_tree.c:4636 [inline]
mas_next+0x1eb/0xc40 lib/maple_tree.c:5723
userfaultfd_register fs/userfaultfd.c:1468 [inline]
userfaultfd_ioctl+0x2527/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4e5785d939
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffff7501a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000031 RCX: 00007f4e5785d939
RDX: 00000000200001c0 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007ffff7501b10 R08: 00007ffff7501a72 R09: 00007ffff7501a72
R10: 00007ffff7501a72 R11: 0000000000000246 R12: 00007ffff7501ae0
R13: 00007f4e578e14e0 R14: 0000000000000003 R15: 00007ffff7501a72
</TASK>
Allocated by task 3592:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
kmem_cache_alloc_bulk+0x39f/0x720 mm/slub.c:3728
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x1df/0x6b0 lib/maple_tree.c:1244
mas_node_count+0x101/0x130 lib/maple_tree.c:1303
mas_split lib/maple_tree.c:3406 [inline]
mas_commit_b_node lib/maple_tree.c:3508 [inline]
mas_wr_modify+0x2505/0x5ac0 lib/maple_tree.c:4251
mas_wr_store_entry.isra.0+0x66e/0x10f0 lib/maple_tree.c:4289
mas_store+0xac/0xf0 lib/maple_tree.c:5523
dup_mmap+0x845/0x1030 kernel/fork.c:687
dup_mm+0x91/0x370 kernel/fork.c:1516
copy_mm kernel/fork.c:1565 [inline]
copy_process+0x3b07/0x6fd0 kernel/fork.c:2226
kernel_clone+0xe7/0xab0 kernel/fork.c:2631
__do_sys_clone+0xc8/0x110 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 3593:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1727 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
slab_free mm/slub.c:3507 [inline]
kmem_cache_free_bulk mm/slub.c:3654 [inline]
kmem_cache_free_bulk+0x2c0/0xb60 mm/slub.c:3641
mt_free_bulk lib/maple_tree.c:157 [inline]
mas_destroy+0x394/0x5c0 lib/maple_tree.c:5685
mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5567
vma_mas_store mm/internal.h:482 [inline]
__vma_adjust+0x6ba/0x18f0 mm/mmap.c:811
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x443/0x530 mm/mmap.c:2259
split_vma+0x9f/0xe0 mm/mmap.c:2292
userfaultfd_register fs/userfaultfd.c:1444 [inline]
userfaultfd_ioctl+0x39f4/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88807811e400
which belongs to the cache maple_node of size 256
The buggy address is located 24 bytes inside of
256-byte region [ffff88807811e400, ffff88807811e500)
The buggy address belongs to the physical page:
page:ffffea0001e04780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7811e
head:ffffea0001e04780 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c4fdc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3286, tgid 3286 (dhcpcd-run-hook), ts 27966983290, free_ts 22717162691
prep_new_page mm/page_alloc.c:2431 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4172
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5393
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1797 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1942
new_slab mm/slub.c:2002 [inline]
___slab_alloc+0x985/0xd90 mm/slub.c:3002
kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244
mas_preallocate+0xfb/0x270 lib/maple_tree.c:5581
__vma_adjust+0x226/0x18f0 mm/mmap.c:742
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x443/0x530 mm/mmap.c:2259
do_mas_align_munmap+0x4f5/0xe80 mm/mmap.c:2375
do_mas_munmap+0x202/0x2c0 mm/mmap.c:2499
mmap_region+0x219/0x1c70 mm/mmap.c:2547
do_mmap+0x825/0xf60 mm/mmap.c:1471
vm_mmap_pgoff+0x1b7/0x290 mm/util.c:488
ksys_mmap_pgoff+0x40d/0x5a0 mm/mmap.c:1517
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1346 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1396
free_unref_page_prepare mm/page_alloc.c:3318 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3413
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3222 [inline]
__kmalloc+0x200/0x350 mm/slub.c:4415
kmalloc include/linux/slab.h:593 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_realpath_nofollow+0xc8/0xe0 security/tomoyo/realpath.c:309
tomoyo_find_next_domain+0x280/0x1f80 security/tomoyo/domain.c:727
tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline]
tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:91
security_bprm_check+0x45/0xa0 security/security.c:865
search_binary_handler fs/exec.c:1718 [inline]
exec_binprm fs/exec.c:1771 [inline]
bprm_execve fs/exec.c:1840 [inline]
bprm_execve+0x732/0x1970 fs/exec.c:1802
do_execveat_common+0x727/0x890 fs/exec.c:1945
do_execve fs/exec.c:2015 [inline]
__do_sys_execve fs/exec.c:2091 [inline]
__se_sys_execve fs/exec.c:2086 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:2086
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88807811e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807811e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807811e400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807811e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807811e500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
Christian Brauner
Apr 27, 2022, 8:56:09 AM4/27/22
to syzbot, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk, Matthew Wilcox
[+Cc Willy]
Matthew Wilcox
Apr 27, 2022, 10:58:29 AM4/27/22
to Christian Brauner, syzbot, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk, Liam R. Howlett
On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> [+Cc Willy]
I read fsdevel. Not sure Liam does though.
> [+Cc Willy]
I read fsdevel. Not sure Liam does though.
Liam Howlett
Apr 27, 2022, 11:17:30 AM4/27/22
to Matthew Wilcox, Christian Brauner, syzbot, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
* Matthew Wilcox <wi...@infradead.org> [220427 10:58]:
Here is a patch that should fix the issue. I will ask AKPM to include
it for tomorrow.
> On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > [+Cc Willy]
>
> I read fsdevel. Not sure Liam does though.
I do not. Thank you for sending it along.
> > [+Cc Willy]
>
> I read fsdevel. Not sure Liam does though.
Here is a patch that should fix the issue. I will ask AKPM to include
it for tomorrow.
Dmitry Vyukov
Apr 27, 2022, 11:22:44 AM4/27/22
to Liam Howlett, Matthew Wilcox, Christian Brauner, syzbot, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
On Wed, 27 Apr 2022 at 17:17, Liam Howlett <liam.h...@oracle.com> wrote:
>
> * Matthew Wilcox <wi...@infradead.org> [220427 10:58]:
> > On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > > [+Cc Willy]
> >
> > I read fsdevel. Not sure Liam does though.
>
> I do not. Thank you for sending it along.
>
> Here is a patch that should fix the issue. I will ask AKPM to include
> it for tomorrow.
Please add the reported tag:
>
> * Matthew Wilcox <wi...@infradead.org> [220427 10:58]:
> > On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > > [+Cc Willy]
> >
> > I read fsdevel. Not sure Liam does though.
>
> I do not. Thank you for sending it along.
>
> Here is a patch that should fix the issue. I will ask AKPM to include
> it for tomorrow.
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bug...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20220427151715.544aa2om5o7pp77n%40revolver.
syzbot
Apr 28, 2022, 1:34:15 AM4/28/22
to syzkall...@googlegroups.com, wanji...@vivo.com
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in mas_next_nentry
==================================================================
BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:715 [inline]
BUG: KASAN: use-after-free in mas_next_nentry+0x8fb/0xa20 lib/maple_tree.c:4549
Read of size 8 at addr ffff88801afb3018 by task syz-executor.0/4018
CPU: 1 PID: 4018 Comm: syz-executor.0 Not tainted 5.18.0-rc4-next-20220427-syzkaller-dirty #0
mas_next_entry lib/maple_tree.c:4639 [inline]
mas_next+0x1eb/0xc40 lib/maple_tree.c:5726
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a4fd74168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9a4ed9bf60 RCX: 00007f9a4ec890e9
RDX: 0000000020000040 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007f9a4ece308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0129a09f R14: 00007f9a4fd74300 R15: 0000000000022000
</TASK>
Allocated by task 3890:
mas_node_count+0x101/0x130 lib/maple_tree.c:1303
mas_expected_entries+0x10b/0x1b0 lib/maple_tree.c:5640
dup_mmap+0x493/0x1030 kernel/fork.c:613
mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5570
vma_mas_store mm/internal.h:482 [inline]
__vma_adjust+0x7a9/0x18f0 mm/mmap.c:836
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x295/0x530 mm/mmap.c:2262
split_vma+0x9f/0xe0 mm/mmap.c:2292
userfaultfd_register fs/userfaultfd.c:1449 [inline]
userfaultfd_ioctl+0x39b5/0x40f0 fs/userfaultfd.c:1993
The buggy address belongs to the physical page:
page:ffffea00006bec80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1afb2
head:ffffea00006bec80 order:1 compound_mapcount:0 compound_pincount:0
split_vma+0x9f/0xe0 mm/mmap.c:2292
mprotect_fixup+0x702/0x950 mm/mprotect.c:575
do_mprotect_pkey+0x635/0xab0 mm/mprotect.c:734
__do_sys_mprotect mm/mprotect.c:761 [inline]
__se_sys_mprotect mm/mprotect.c:758 [inline]
__x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:758
kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
vfs_fstatat+0x73/0xb0 fs/stat.c:254
__do_sys_newfstatat+0x91/0x110 fs/stat.c:425
ffff88801afb2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801afb3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801afb3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801afb3100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: f02ac5c9 Add linux-next specific files for 20220427
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=125f05aaf00000
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in mas_next_nentry
==================================================================
BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:715 [inline]
Read of size 8 at addr ffff88801afb3018 by task syz-executor.0/4018
CPU: 1 PID: 4018 Comm: syz-executor.0 Not tainted 5.18.0-rc4-next-20220427-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
mas_safe_min lib/maple_tree.c:715 [inline]
mas_next_nentry+0x8fb/0xa20 lib/maple_tree.c:4549
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
mas_safe_min lib/maple_tree.c:715 [inline]
mas_next_entry lib/maple_tree.c:4639 [inline]
mas_next+0x1eb/0xc40 lib/maple_tree.c:5726
userfaultfd_register fs/userfaultfd.c:1468 [inline]
userfaultfd_ioctl+0x2527/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9a4ec890e9
userfaultfd_ioctl+0x2527/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a4fd74168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9a4ed9bf60 RCX: 00007f9a4ec890e9
RDX: 0000000020000040 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007f9a4ece308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0129a09f R14: 00007f9a4fd74300 R15: 0000000000022000
</TASK>
Allocated by task 3890:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
kmem_cache_alloc_bulk+0x39f/0x720 mm/slub.c:3728
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
kmem_cache_alloc_bulk+0x39f/0x720 mm/slub.c:3728
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_node_count+0x101/0x130 lib/maple_tree.c:1303
mas_expected_entries+0x10b/0x1b0 lib/maple_tree.c:5640
dup_mmap+0x493/0x1030 kernel/fork.c:613
dup_mm+0x91/0x370 kernel/fork.c:1516
copy_mm kernel/fork.c:1565 [inline]
copy_process+0x3b07/0x6fd0 kernel/fork.c:2226
kernel_clone+0xe7/0xab0 kernel/fork.c:2631
__do_sys_clone+0xc8/0x110 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 4018:
copy_mm kernel/fork.c:1565 [inline]
copy_process+0x3b07/0x6fd0 kernel/fork.c:2226
kernel_clone+0xe7/0xab0 kernel/fork.c:2631
__do_sys_clone+0xc8/0x110 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1727 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
slab_free mm/slub.c:3507 [inline]
kmem_cache_free_bulk mm/slub.c:3654 [inline]
kmem_cache_free_bulk+0x2c0/0xb60 mm/slub.c:3641
mt_free_bulk lib/maple_tree.c:157 [inline]
mas_destroy+0x394/0x5c0 lib/maple_tree.c:5688
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1727 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
slab_free mm/slub.c:3507 [inline]
kmem_cache_free_bulk mm/slub.c:3654 [inline]
kmem_cache_free_bulk+0x2c0/0xb60 mm/slub.c:3641
mt_free_bulk lib/maple_tree.c:157 [inline]
mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5570
vma_mas_store mm/internal.h:482 [inline]
__vma_adjust+0x7a9/0x18f0 mm/mmap.c:836
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x295/0x530 mm/mmap.c:2262
split_vma+0x9f/0xe0 mm/mmap.c:2292
userfaultfd_register fs/userfaultfd.c:1449 [inline]
userfaultfd_ioctl+0x39b5/0x40f0 fs/userfaultfd.c:1993
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88801afb3000
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
which belongs to the cache maple_node of size 256
The buggy address is located 24 bytes inside of
256-byte region [ffff88801afb3000, ffff88801afb3100)
The buggy address is located 24 bytes inside of
The buggy address belongs to the physical page:
head:ffffea00006bec80 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001d50b00 dead000000000004 ffff888010c4fdc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3820, tgid 3820 (sed), ts 62265865121, free_ts 61979482596
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
prep_new_page mm/page_alloc.c:2431 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4172
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5393
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1797 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1942
new_slab mm/slub.c:2002 [inline]
___slab_alloc+0x985/0xd90 mm/slub.c:3002
kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244
mas_preallocate+0xfb/0x270 lib/maple_tree.c:5584
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4172
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5393
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1797 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1942
new_slab mm/slub.c:2002 [inline]
___slab_alloc+0x985/0xd90 mm/slub.c:3002
kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704
mt_alloc_bulk lib/maple_tree.c:151 [inline]
mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244
__vma_adjust+0x226/0x18f0 mm/mmap.c:742
vma_adjust include/linux/mm.h:2654 [inline]
__split_vma+0x295/0x530 mm/mmap.c:2262
vma_adjust include/linux/mm.h:2654 [inline]
split_vma+0x9f/0xe0 mm/mmap.c:2292
mprotect_fixup+0x702/0x950 mm/mprotect.c:575
do_mprotect_pkey+0x635/0xab0 mm/mprotect.c:734
__do_sys_mprotect mm/mprotect.c:761 [inline]
__se_sys_mprotect mm/mprotect.c:758 [inline]
__x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:758
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1346 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1396
free_unref_page_prepare mm/page_alloc.c:3318 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3413
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3222 [inline]
__kmem_cache_alloc_lru mm/slub.c:3229 [inline]
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1346 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1396
free_unref_page_prepare mm/page_alloc.c:3318 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3413
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3222 [inline]
kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
vfs_fstatat+0x73/0xb0 fs/stat.c:254
__do_sys_newfstatat+0x91/0x110 fs/stat.c:425
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff88801afb2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801afb2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801afb3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801afb3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801afb3100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: f02ac5c9 Add linux-next specific files for 20220427
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=125f05aaf00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e9256c70f586da8a
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=1269caf8f00000
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Dan Carpenter
Apr 28, 2022, 2:24:01 AM4/28/22
to Dmitry Vyukov, Liam Howlett, Matthew Wilcox, Christian Brauner, syzbot, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
On Wed, Apr 27, 2022 at 05:22:31PM +0200, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Wed, 27 Apr 2022 at 17:17, Liam Howlett <liam.h...@oracle.com> wrote:
> >
> > * Matthew Wilcox <wi...@infradead.org> [220427 10:58]:
> > > On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > > > [+Cc Willy]
> > >
> > > I read fsdevel. Not sure Liam does though.
> >
> > I do not. Thank you for sending it along.
> >
> > Here is a patch that should fix the issue. I will ask AKPM to include
> > it for tomorrow.
>
> Please add the reported tag:
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7170d6...@syzkaller.appspotmail.com
>
And a Fixes tag as well.
> On Wed, 27 Apr 2022 at 17:17, Liam Howlett <liam.h...@oracle.com> wrote:
> >
> > * Matthew Wilcox <wi...@infradead.org> [220427 10:58]:
> > > On Wed, Apr 27, 2022 at 02:55:58PM +0200, Christian Brauner wrote:
> > > > [+Cc Willy]
> > >
> > > I read fsdevel. Not sure Liam does though.
> >
> > I do not. Thank you for sending it along.
> >
> > Here is a patch that should fix the issue. I will ask AKPM to include
> > it for tomorrow.
>
> Please add the reported tag:
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7170d6...@syzkaller.appspotmail.com
>
regards,
dan carpenter
syzbot
Jan 25, 2023, 5:04:19 PM1/25/23
to Liam.H...@oracle.com, bra...@kernel.org, dan.ca...@oracle.com, dvy...@google.com, liam.h...@oracle.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, torv...@linux-foundation.org, vi...@zeniv.linux.org.uk, wanji...@vivo.com, wi...@infradead.org
syzbot suspects this issue was fixed by commit:
commit 59f2f4b8a757412fce372f6d0767bdb55da127a8
Author: Liam Howlett <liam.h...@oracle.com>
Date: Mon Nov 7 20:11:42 2022 +0000
fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=129e8afe480000
start commit: b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11bfb2a9880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b1d319880000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 59f2f4b8a757412fce372f6d0767bdb55da127a8
Author: Liam Howlett <liam.h...@oracle.com>
Date: Mon Nov 7 20:11:42 2022 +0000
fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=129e8afe480000
start commit: b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11bfb2a9880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b1d319880000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
Liam R. Howlett
Jan 26, 2023, 8:14:33 AM1/26/23
to syzbot, bra...@kernel.org, dan.ca...@oracle.com, dvy...@google.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, torv...@linux-foundation.org, vi...@zeniv.linux.org.uk, wanji...@vivo.com, wi...@infradead.org
syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
* syzbot <syzbot+7170d6...@syzkaller.appspotmail.com> [230125 17:04]:
Dmitry Vyukov
Jan 27, 2023, 2:09:21 AM1/27/23
to Liam R. Howlett, syzbot, bra...@kernel.org, dan.ca...@oracle.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, torv...@linux-foundation.org, vi...@zeniv.linux.org.uk, wanji...@vivo.com, wi...@infradead.org
On Thu, 26 Jan 2023 at 14:14, Liam R. Howlett <Liam.H...@oracle.com> wrote:
>
> syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
>
> * syzbot <syzbot+7170d6...@syzkaller.appspotmail.com> [230125 17:04]:
> > syzbot suspects this issue was fixed by commit:
syzbot needs the hash to parse the command:
>
> syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
>
> * syzbot <syzbot+7170d6...@syzkaller.appspotmail.com> [230125 17:04]:
> > syzbot suspects this issue was fixed by commit:
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