KASAN: use-after-free Write in vm_area_free
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syzbot
Oct 13, 2022, 3:55:41 AM10/13/22
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 43eb03f7ce81 Merge 5.15.72 into android13-5.15-lts
git tree: android13-5.15-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=12d2f7cc880000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1f5e2a41a2f89af
dashboard link: https://syzkaller.appspot.com/bug?extid=7895926003edc3fd4e01
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10632d34880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1163f294880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e6914a80f72e/disk-43eb03f7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0b71dce9a71/vmlinux-43eb03f7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+789592...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline]
BUG: KASAN: use-after-free in anon_vma_name_put include/linux/mm_inline.h:343 [inline]
BUG: KASAN: use-after-free in free_anon_vma_name include/linux/mm_inline.h:374 [inline]
BUG: KASAN: use-after-free in vm_area_free+0x7e/0x230 kernel/fork.c:400
Write of size 4 at addr ffff88811f742870 by task syz-executor129/452
CPU: 1 PID: 452 Comm: syz-executor129 Not tainted 5.15.72-syzkaller-04310-g43eb03f7ce81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_address_description+0x87/0x3d0 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:435 [inline]
kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452
kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
__refcount_sub_and_test include/linux/refcount.h:272 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
kref_put include/linux/kref.h:64 [inline]
anon_vma_name_put include/linux/mm_inline.h:343 [inline]
free_anon_vma_name include/linux/mm_inline.h:374 [inline]
vm_area_free+0x7e/0x230 kernel/fork.c:400
dup_mmap+0xbcd/0xea0 kernel/fork.c:671
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f7dee2b0d69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff67ee7718 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7dee2b0d69
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000001000
RBP: 00007fff67ee7730 R08: 0000000000000000 R09: 0000000000000015
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fff67ee7750 R14: 00007fff67ee7740 R15: 00007fff67ee7724
</TASK>
Allocated by task 445:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:244 [inline]
slab_post_alloc_hook mm/slab.h:550 [inline]
slab_alloc_node mm/slub.c:3236 [inline]
slab_alloc mm/slub.c:3244 [inline]
kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249
vm_area_dup+0x26/0x1d0 kernel/fork.c:367
dup_mmap+0x6b8/0xea0 kernel/fork.c:591
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Freed by task 451:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:220 [inline]
slab_free_hook mm/slub.c:1721 [inline]
slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747
slab_free mm/slub.c:3515 [inline]
kmem_cache_free+0x11a/0x2e0 mm/slub.c:3531
____vm_area_free kernel/fork.c:386 [inline]
vm_area_free+0x1ae/0x230 kernel/fork.c:412
remove_vma mm/mmap.c:190 [inline]
exit_mmap+0x5dd/0x7a0 mm/mmap.c:3205
__mmput+0x95/0x300 kernel/fork.c:1162
mmput+0x50/0x60 kernel/fork.c:1184
exit_mm+0x50d/0x760 kernel/exit.c:504
do_exit+0x63c/0x24d0 kernel/exit.c:815
__do_sys_exit kernel/exit.c:894 [inline]
__se_sys_exit kernel/exit.c:892 [inline]
__ia32_sys_exit+0x0/0x40 kernel/exit.c:892
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff88811f742818
which belongs to the cache vm_area_struct of size 232
The buggy address is located 88 bytes inside of
232-byte region [ffff88811f742818, ffff88811f742900)
The buggy address belongs to the page:
page:ffffea00047dd080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f742
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100274d80
raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 445, ts 24758360952, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495
prep_new_page mm/page_alloc.c:2501 [inline]
get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281
__alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548
allocate_slab+0x62/0x580 mm/slub.c:1928
new_slab mm/slub.c:1991 [inline]
___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024
__slab_alloc+0x4a/0x90 mm/slub.c:3111
slab_alloc_node mm/slub.c:3202 [inline]
slab_alloc mm/slub.c:3244 [inline]
kmem_cache_alloc+0x205/0x2f0 mm/slub.c:3249
vm_area_dup+0x26/0x1d0 kernel/fork.c:367
dup_mmap+0x6b8/0xea0 kernel/fork.c:591
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing
Memory state around the buggy address:
ffff88811f742700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811f742780: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>ffff88811f742800: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811f742880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811f742900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
---
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: 43eb03f7ce81 Merge 5.15.72 into android13-5.15-lts
git tree: android13-5.15-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=12d2f7cc880000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1f5e2a41a2f89af
dashboard link: https://syzkaller.appspot.com/bug?extid=7895926003edc3fd4e01
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10632d34880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1163f294880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e6914a80f72e/disk-43eb03f7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0b71dce9a71/vmlinux-43eb03f7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+789592...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline]
BUG: KASAN: use-after-free in anon_vma_name_put include/linux/mm_inline.h:343 [inline]
BUG: KASAN: use-after-free in free_anon_vma_name include/linux/mm_inline.h:374 [inline]
BUG: KASAN: use-after-free in vm_area_free+0x7e/0x230 kernel/fork.c:400
Write of size 4 at addr ffff88811f742870 by task syz-executor129/452
CPU: 1 PID: 452 Comm: syz-executor129 Not tainted 5.15.72-syzkaller-04310-g43eb03f7ce81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_address_description+0x87/0x3d0 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:435 [inline]
kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452
kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline]
__refcount_sub_and_test include/linux/refcount.h:272 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
kref_put include/linux/kref.h:64 [inline]
anon_vma_name_put include/linux/mm_inline.h:343 [inline]
free_anon_vma_name include/linux/mm_inline.h:374 [inline]
vm_area_free+0x7e/0x230 kernel/fork.c:400
dup_mmap+0xbcd/0xea0 kernel/fork.c:671
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f7dee2b0d69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff67ee7718 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7dee2b0d69
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000001000
RBP: 00007fff67ee7730 R08: 0000000000000000 R09: 0000000000000015
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fff67ee7750 R14: 00007fff67ee7740 R15: 00007fff67ee7724
</TASK>
Allocated by task 445:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:244 [inline]
slab_post_alloc_hook mm/slab.h:550 [inline]
slab_alloc_node mm/slub.c:3236 [inline]
slab_alloc mm/slub.c:3244 [inline]
kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249
vm_area_dup+0x26/0x1d0 kernel/fork.c:367
dup_mmap+0x6b8/0xea0 kernel/fork.c:591
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Freed by task 451:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:220 [inline]
slab_free_hook mm/slub.c:1721 [inline]
slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747
slab_free mm/slub.c:3515 [inline]
kmem_cache_free+0x11a/0x2e0 mm/slub.c:3531
____vm_area_free kernel/fork.c:386 [inline]
vm_area_free+0x1ae/0x230 kernel/fork.c:412
remove_vma mm/mmap.c:190 [inline]
exit_mmap+0x5dd/0x7a0 mm/mmap.c:3205
__mmput+0x95/0x300 kernel/fork.c:1162
mmput+0x50/0x60 kernel/fork.c:1184
exit_mm+0x50d/0x760 kernel/exit.c:504
do_exit+0x63c/0x24d0 kernel/exit.c:815
__do_sys_exit kernel/exit.c:894 [inline]
__se_sys_exit kernel/exit.c:892 [inline]
__ia32_sys_exit+0x0/0x40 kernel/exit.c:892
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff88811f742818
which belongs to the cache vm_area_struct of size 232
The buggy address is located 88 bytes inside of
232-byte region [ffff88811f742818, ffff88811f742900)
The buggy address belongs to the page:
page:ffffea00047dd080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f742
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100274d80
raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 445, ts 24758360952, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495
prep_new_page mm/page_alloc.c:2501 [inline]
get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281
__alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548
allocate_slab+0x62/0x580 mm/slub.c:1928
new_slab mm/slub.c:1991 [inline]
___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024
__slab_alloc+0x4a/0x90 mm/slub.c:3111
slab_alloc_node mm/slub.c:3202 [inline]
slab_alloc mm/slub.c:3244 [inline]
kmem_cache_alloc+0x205/0x2f0 mm/slub.c:3249
vm_area_dup+0x26/0x1d0 kernel/fork.c:367
dup_mmap+0x6b8/0xea0 kernel/fork.c:591
dup_mm+0x91/0x330 kernel/fork.c:1502
copy_mm+0x108/0x1b0 kernel/fork.c:1554
copy_process+0x1295/0x3250 kernel/fork.c:2245
kernel_clone+0x22d/0x990 kernel/fork.c:2646
__do_sys_clone kernel/fork.c:2772 [inline]
__se_sys_clone kernel/fork.c:2756 [inline]
__x64_sys_clone+0x289/0x310 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing
Memory state around the buggy address:
ffff88811f742700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811f742780: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>ffff88811f742800: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811f742880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811f742900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
---
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
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