Hello,
syzbot found the following issue on:
HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11369f1c480000
kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=8317cc9c082c19d576a0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
==================================================================
BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
Read of size 8 at addr ffff888075a278f0 by task syz-executor.3/5101
CPU: 1 PID: 5101 Comm: syz-executor.3 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xc0/0xf0 mm/kasan/report.c:517
__wake_up_common+0x637/0x650 kernel/sched/wait.c:100
__wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138
__wake_up kernel/sched/wait.c:160 [inline]
__wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246
wake_up_pollfree include/linux/wait.h:271 [inline]
signalfd_cleanup+0x46/0x60 fs/signalfd.c:38
__cleanup_sighand kernel/fork.c:1688 [inline]
__cleanup_sighand+0x76/0xb0 kernel/fork.c:1685
__exit_signal kernel/exit.c:209 [inline]
release_task+0xbfa/0x1870 kernel/exit.c:255
wait_task_zombie kernel/exit.c:1198 [inline]
wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425
do_wait_thread kernel/exit.c:1488 [inline]
do_wait+0x7cd/0xd90 kernel/exit.c:1605
kernel_wait4+0x150/0x260 kernel/exit.c:1768
__do_sys_wait4+0x13f/0x150 kernel/exit.c:1796
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f65a2089ca7
Code: 89 7c 24 10 48 89 4c 24 18 e8 f5 58 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 59 02 00 8b 44
RSP: 002b:00007ffefc1200b0 EFLAGS: 00000293
ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000000000054a RCX: 00007f65a2089ca7
RDX: 0000000040000001 RSI: 00007ffefc12013c RDI: 00000000ffffffff
RBP: 00007ffefc12013c R08: 0000000000000000 R09: 00007ffefc1ad080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000021b8d4 R14: 0000000000000009 R15: 00007ffefc1201a0
</TASK>
Allocated by task 14352:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 12659:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff888075a278c0
which belongs to the cache io_kiocb of size 216
The buggy address is located 48 bytes inside of
216-byte region [ffff888075a278c0, ffff888075a27998)
The buggy address belongs to the physical page:
page:ffffea0001d689c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75a27
memcg:ffff888028fe9e01
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff888146399500 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff888028fe9e01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 12466, tgid 12462 (syz-executor.3), ts 1668345481737, free_ts 1642794681828
prep_new_page mm/page_alloc.c:2549 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1451 [inline]
free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc_lru+0x20e/0x580 mm/slub.c:3483
alloc_inode_sb include/linux/fs.h:2692 [inline]
ext4_alloc_inode+0x28/0x680 fs/ext4/super.c:1321
alloc_inode+0x61/0x230 fs/inode.c:260
new_inode_pseudo fs/inode.c:1019 [inline]
new_inode+0x2b/0x280 fs/inode.c:1047
__ext4_new_inode+0x399/0x58c0 fs/ext4/ialloc.c:959
ext4_create+0x2da/0x4e0 fs/ext4/namei.c:2809
lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3414
open_last_lookups fs/namei.c:3482 [inline]
path_openat+0x97a/0x2b40 fs/namei.c:3712
do_filp_open+0x1ba/0x410 fs/namei.c:3742
do_sys_openat2+0x16d/0x4c0 fs/open.c:1311
Memory state around the buggy address:
ffff888075a27780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888075a27800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>ffff888075a27880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
^
ffff888075a27900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888075a27980: fb fb fb 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 [email protected].
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot has found a reproducer for the following issue on:
HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10a992a1480000
kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=8317cc9c082c19d576a0
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=11f672ee480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1357774a480000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
==================================================================
BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
Read of size 8 at addr ffff88801d1508f0 by task syz-executor378/5077
CPU: 0 PID: 5077 Comm: syz-executor378 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xc0/0xf0 mm/kasan/report.c:517
__wake_up_common+0x637/0x650 kernel/sched/wait.c:100
__wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138
__wake_up kernel/sched/wait.c:160 [inline]
__wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246
wake_up_pollfree include/linux/wait.h:271 [inline]
signalfd_cleanup+0x46/0x60 fs/signalfd.c:38
__cleanup_sighand kernel/fork.c:1688 [inline]
__cleanup_sighand+0x76/0xb0 kernel/fork.c:1685
__exit_signal kernel/exit.c:209 [inline]
release_task+0xbfa/0x1870 kernel/exit.c:255
wait_task_zombie kernel/exit.c:1198 [inline]
wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425
do_wait_thread kernel/exit.c:1488 [inline]
do_wait+0x7cd/0xd90 kernel/exit.c:1605
kernel_wait4+0x150/0x260 kernel/exit.c:1768
__do_sys_wait4+0x13f/0x150 kernel/exit.c:1796
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7facd1d06656
Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24
RSP: 002b:00007ffc250fbf98 EFLAGS: 00000246
ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00007ffc250fc050 RCX: 00007facd1d06656
RDX: 0000000040000001 RSI: 00007ffc250fbfcc RDI: 00000000ffffffff
RBP: 00007ffc250fbfcc R08: 000000000000003d R09: 00007ffc251bb080
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240
R13: 0000000000000002 R14: 00007ffc250fc020 R15: 00007ffc250fc010
</TASK>
Allocated by task 5081:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 33:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
worker_thread+0x669/0x1090 kernel/workqueue.c:2440
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to the object at ffff88801d1508c0
which belongs to the cache io_kiocb of size 216
The buggy address is located 48 bytes inside of
216-byte region [ffff88801d1508c0, ffff88801d150998)
The buggy address belongs to the physical page:
page:ffffea0000745400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d150
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff88801beb7780 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 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 5081, tgid 5079 (syz-executor378), ts 61182579448, free_ts 52418879084
prep_new_page mm/page_alloc.c:2549 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
__io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
io_alloc_req_refill io_uring/io_uring.h:348 [inline]
io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
__do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1451 [inline]
free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
__folio_put_small mm/swap.c:106 [inline]
__folio_put+0xc5/0x140 mm/swap.c:129
folio_put include/linux/mm.h:1203 [inline]
put_page include/linux/mm.h:1272 [inline]
anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138
pipe_buf_release include/linux/pipe_fs_i.h:183 [inline]
pipe_read+0x614/0x1110 fs/pipe.c:324
call_read_iter include/linux/fs.h:1846 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x7fa/0x930 fs/read_write.c:470
ksys_read+0x1ec/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Memory state around the buggy address:
ffff88801d150780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d150800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
>ffff88801d150880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
^
ffff88801d150900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d150980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Over to the io_uring maintainers and list, based on the reproducer...:
r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0)
r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0)
pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff})
write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc)
syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0)
io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0)
On Thu, Jan 12, 2023 at 02:40:39PM -0800, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=10a992a1480000
> kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
> dashboard link: https://syzkaller.appspot.com/bug?extid=8317cc9c082c19d576a0
> 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=11f672ee480000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1357774a480000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
>
> ==================================================================
> BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
> Read of size 8 at addr ffff88801d1508f0 by task syz-executor378/5077
>
> CPU: 0 PID: 5077 Comm: syz-executor378 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
> print_address_description mm/kasan/report.c:306 [inline]
> print_report+0x15e/0x45d mm/kasan/report.c:417
> kasan_report+0xc0/0xf0 mm/kasan/report.c:517
> __wake_up_common+0x637/0x650 kernel/sched/wait.c:100
> __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138
> __wake_up kernel/sched/wait.c:160 [inline]
> __wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246
> wake_up_pollfree include/linux/wait.h:271 [inline]
> signalfd_cleanup+0x46/0x60 fs/signalfd.c:38
> __cleanup_sighand kernel/fork.c:1688 [inline]
> __cleanup_sighand+0x76/0xb0 kernel/fork.c:1685
> __exit_signal kernel/exit.c:209 [inline]
> release_task+0xbfa/0x1870 kernel/exit.c:255
> wait_task_zombie kernel/exit.c:1198 [inline]
> wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425
> do_wait_thread kernel/exit.c:1488 [inline]
> do_wait+0x7cd/0xd90 kernel/exit.c:1605
> kernel_wait4+0x150/0x260 kernel/exit.c:1768
> __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7facd1d06656
> Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24
> RSP: 002b:00007ffc250fbf98 EFLAGS: 00000246
> ORIG_RAX: 000000000000003d
> RAX: ffffffffffffffda RBX: 00007ffc250fc050 RCX: 00007facd1d06656
> RDX: 0000000040000001 RSI: 00007ffc250fbfcc RDI: 00000000ffffffff
> RBP: 00007ffc250fbfcc R08: 000000000000003d R09: 00007ffc251bb080
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240
> R13: 0000000000000002 R14: 00007ffc250fc020 R15: 00007ffc250fc010
> </TASK>
>
> Allocated by task 5081:
> kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
> kasan_set_track+0x25/0x30 mm/kasan/common.c:52
> __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325
> kasan_slab_alloc include/linux/kasan.h:186 [inline]
> slab_post_alloc_hook mm/slab.h:769 [inline]
> kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033
> __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
> io_alloc_req_refill io_uring/io_uring.h:348 [inline]
> io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
> __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Freed by task 33:
> kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
> kasan_set_track+0x25/0x30 mm/kasan/common.c:52
> kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
> ____kasan_slab_free mm/kasan/common.c:236 [inline]
> ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
> kasan_slab_free include/linux/kasan.h:162 [inline]
> slab_free_hook mm/slub.c:1781 [inline]
> slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
> slab_free mm/slub.c:3787 [inline]
> kmem_cache_free+0xec/0x4e0 mm/slub.c:3809
> io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737
> io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967
> process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293
> worker_thread+0x669/0x1090 kernel/workqueue.c:2440
> kthread+0x2e8/0x3a0 kernel/kthread.c:376
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>
> The buggy address belongs to the object at ffff88801d1508c0
> which belongs to the cache io_kiocb of size 216
> The buggy address is located 48 bytes inside of
> 216-byte region [ffff88801d1508c0, ffff88801d150998)
>
> The buggy address belongs to the physical page:
> page:ffffea0000745400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d150
> flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
> raw: 00fff00000000200 ffff88801beb7780 dead000000000122 0000000000000000
> raw: 0000000000000000 00000000800c000c 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 5081, tgid 5079 (syz-executor378), ts 61182579448, free_ts 52418879084
> prep_new_page mm/page_alloc.c:2549 [inline]
> get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
> __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
> alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
> alloc_slab_page mm/slub.c:1851 [inline]
> allocate_slab+0x25f/0x350 mm/slub.c:1998
> new_slab mm/slub.c:2051 [inline]
> ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
> __kmem_cache_alloc_bulk mm/slub.c:3951 [inline]
> kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026
> __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062
> io_alloc_req_refill io_uring/io_uring.h:348 [inline]
> io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407
> __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> page last free stack trace:
> reset_page_owner include/linux/page_owner.h:24 [inline]
> free_pages_prepare mm/page_alloc.c:1451 [inline]
> free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
> free_unref_page_prepare mm/page_alloc.c:3387 [inline]
> free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
> __folio_put_small mm/swap.c:106 [inline]
> __folio_put+0xc5/0x140 mm/swap.c:129
> folio_put include/linux/mm.h:1203 [inline]
> put_page include/linux/mm.h:1272 [inline]
> anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138
> pipe_buf_release include/linux/pipe_fs_i.h:183 [inline]
> pipe_read+0x614/0x1110 fs/pipe.c:324
> call_read_iter include/linux/fs.h:1846 [inline]
> new_sync_read fs/read_write.c:389 [inline]
> vfs_read+0x7fa/0x930 fs/read_write.c:470
> ksys_read+0x1ec/0x250 fs/read_write.c:613
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Memory state around the buggy address:
> ffff88801d150780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88801d150800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
> >ffff88801d150880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
> ^
> ffff88801d150900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88801d150980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================
>
> --
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On 1/12/23 7:12 PM, Eric Biggers wrote:
> Over to the io_uring maintainers and list, based on the reproducer...:
>
> r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0)
> r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0)
> pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff})
> write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc)
> syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0)
> io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0)
This was a buggy patch in a branch, already updated and can be discarded.
--
Jens Axboe
On Thu, Jan 12, 2023 at 07:17:25PM -0700, Jens Axboe wrote:
> On 1/12/23 7:12 PM, Eric Biggers wrote:
> > Over to the io_uring maintainers and list, based on the reproducer...:
> >
> > r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0)
> > r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0)
> > pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff})
> > write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc)
> > syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0)
> > io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0)
>
> This was a buggy patch in a branch, already updated and can be discarded.
>
Then let's do:
#syz invalid