Re: [syzbot] KASAN: use-after-free Read in create_worker_cb
Hello, syzbot has tested the proposed patch and the reproducer did not trigger any issue: Reported-and-tested-by: syzbot+099593561bbd1805b...@syzkaller.appspotmail.com Tested on: commit: 24996dbd io_uring: reg buffer overflow checks hardening git tree: git://git.kernel.dk/linux-block for-5.13/io_uring kernel config: https://syzkaller.appspot.com/x/.config?x=cbb3af9ca0d22f7a dashboard link: https://syzkaller.appspot.com/bug?extid=099593561bbd1805b839 compiler: Note: testing is done by a robot and is best-effort only.
Re: [syzbot] KASAN: use-after-free Read in create_worker_cb
On 3/29/21 1:54 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:93129492 Add linux-next specific files for 20210326
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=144509bad0
> kernel config: https://syzkaller.appspot.com/x/.config?x=4c9322cd4e3b7a16
> dashboard link: https://syzkaller.appspot.com/bug?extid=099593561bbd1805b839
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124ce00ed0
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1664d5aad0
>
> The issue was bisected to:
>
> commit 4d004099a668c41522242aa146a38cc4eb59cb1e
> Author: Peter Zijlstra
> Date: Fri Oct 2 09:04:21 2020 +
>
> lockdep: Fix lockdep recursion
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12f96b7cd0
> final oops: https://syzkaller.appspot.com/x/report.txt?x=11f96b7cd0
> console output: https://syzkaller.appspot.com/x/log.txt?x=16f96b7cd0
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+099593561bbd1805b...@syzkaller.appspotmail.com
> Fixes: 4d004099a668 ("lockdep: Fix lockdep recursion")
>
> ==
> BUG: KASAN: use-after-free in create_worker_cb+0xaa/0xc0 fs/io-wq.c:272
> Read of size 8 at addr 88801bf150e8 by task syz-executor364/8509
>
> CPU: 0 PID: 8509 Comm: syz-executor364 Not tainted
> 5.12.0-rc4-next-20210326-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
> __kasan_report mm/kasan/report.c:399 [inline]
> kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
> create_worker_cb+0xaa/0xc0 fs/io-wq.c:272
> task_work_run+0xdd/0x1a0 kernel/task_work.c:143
> exit_task_work include/linux/task_work.h:30 [inline]
> do_exit+0xbfc/0x2a60 kernel/exit.c:825
> do_group_exit+0x125/0x310 kernel/exit.c:922
> __do_sys_exit_group kernel/exit.c:933 [inline]
> __se_sys_exit_group kernel/exit.c:931 [inline]
> __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x447359
> Code: Unable to access opcode bytes at RIP 0x44732f.
> RSP: 002b:7ffdfb4e3ea8 EFLAGS: 0246 ORIG_RAX: 00e7
> RAX: ffda RBX: 004b8390 RCX: 00447359
> RDX: 003c RSI: 00e7 RDI:
> RBP: R08: ffc0 R09:
> R10: R11: 0246 R12: 004b8390
> R13: 0001 R14: R15: 0001
>
> Allocated by task 8509:
> kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
> kasan_set_track mm/kasan/common.c:46 [inline]
> set_alloc_info mm/kasan/common.c:428 [inline]
> kasan_kmalloc mm/kasan/common.c:507 [inline]
> kasan_kmalloc mm/kasan/common.c:466 [inline]
> __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516
> kmalloc_node include/linux/slab.h:574 [inline]
> kzalloc_node include/linux/slab.h:697 [inline]
> io_wq_create+0x6e4/0xca0 fs/io-wq.c:934
> io_init_wq_offload fs/io_uring.c:7938 [inline]
> io_uring_alloc_task_context+0x1bf/0x660 fs/io_uring.c:7957
> __io_uring_add_task_file+0x29a/0x3c0 fs/io_uring.c:8915
> io_uring_add_task_file fs/io_uring.c:8951 [inline]
> io_uring_install_fd fs/io_uring.c:9509 [inline]
> io_uring_create fs/io_uring.c:9656 [inline]
> io_uring_setup+0x20dd/0x2b00 fs/io_uring.c:9693
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> Freed by task 8509:
> kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
> kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
> kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
> kasan_slab_free mm/kasan/common.c:360 [inline]
> kasan_slab_free mm/kasan/common.c:325 [inline]
> __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
> kasan_slab_free include/linux/kasan.h:212 [inline]
> slab_free_hook mm/slub.c:1578 [inline]
> slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1603
> slab_free mm/slub.c:3163 [inline]
> kfree+0xe5/0x7f0 mm/slub.c:4230
> io_wq_destroy+0x13e/0x2d0 fs/io-wq.c:1022
> io_wq_put fs/io-wq.c:1032 [inline]
> io_wq_put_and_exit+0x7a/0xa0 fs/io-wq.c:1038
> io_uring_clean_tctx+0xed/0x160 fs/io_uring.c:8988
> __io_uring_files_cancel+0x703/0x850 fs/io_uring.c:9053
> io_uring_files_cancel include/linux/io_uring.h:22 [inline]
> do_exit+0x299/0x2a60 kernel/exit.c:780
> do_group_exit+0x125/0x310 kernel/exit.c:922
> __do_sys_exit_group kernel/exit.c:933 [inline]
> __se_sys_exit_group kernel/exit.c:931 [inline]
> __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>
[syzbot] KASAN: use-after-free Read in create_worker_cb
Hello,
syzbot found the following issue on:
HEAD commit:93129492 Add linux-next specific files for 20210326
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=144509bad0
kernel config: https://syzkaller.appspot.com/x/.config?x=4c9322cd4e3b7a16
dashboard link: https://syzkaller.appspot.com/bug?extid=099593561bbd1805b839
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124ce00ed0
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1664d5aad0
The issue was bisected to:
commit 4d004099a668c41522242aa146a38cc4eb59cb1e
Author: Peter Zijlstra
Date: Fri Oct 2 09:04:21 2020 +
lockdep: Fix lockdep recursion
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12f96b7cd0
final oops: https://syzkaller.appspot.com/x/report.txt?x=11f96b7cd0
console output: https://syzkaller.appspot.com/x/log.txt?x=16f96b7cd0
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+099593561bbd1805b...@syzkaller.appspotmail.com
Fixes: 4d004099a668 ("lockdep: Fix lockdep recursion")
==
BUG: KASAN: use-after-free in create_worker_cb+0xaa/0xc0 fs/io-wq.c:272
Read of size 8 at addr 88801bf150e8 by task syz-executor364/8509
CPU: 0 PID: 8509 Comm: syz-executor364 Not tainted
5.12.0-rc4-next-20210326-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google
01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
create_worker_cb+0xaa/0xc0 fs/io-wq.c:272
task_work_run+0xdd/0x1a0 kernel/task_work.c:143
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
__do_sys_exit_group kernel/exit.c:933 [inline]
__se_sys_exit_group kernel/exit.c:931 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x447359
Code: Unable to access opcode bytes at RIP 0x44732f.
RSP: 002b:7ffdfb4e3ea8 EFLAGS: 0246 ORIG_RAX: 00e7
RAX: ffda RBX: 004b8390 RCX: 00447359
RDX: 003c RSI: 00e7 RDI:
RBP: R08: ffc0 R09:
R10: R11: 0246 R12: 004b8390
R13: 0001 R14: R15: 0001
Allocated by task 8509:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
kasan_kmalloc mm/kasan/common.c:507 [inline]
kasan_kmalloc mm/kasan/common.c:466 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516
kmalloc_node include/linux/slab.h:574 [inline]
kzalloc_node include/linux/slab.h:697 [inline]
io_wq_create+0x6e4/0xca0 fs/io-wq.c:934
io_init_wq_offload fs/io_uring.c:7938 [inline]
io_uring_alloc_task_context+0x1bf/0x660 fs/io_uring.c:7957
__io_uring_add_task_file+0x29a/0x3c0 fs/io_uring.c:8915
io_uring_add_task_file fs/io_uring.c:8951 [inline]
io_uring_install_fd fs/io_uring.c:9509 [inline]
io_uring_create fs/io_uring.c:9656 [inline]
io_uring_setup+0x20dd/0x2b00 fs/io_uring.c:9693
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 8509:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
kasan_slab_free mm/kasan/common.c:360 [inline]
kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:212 [inline]
slab_free_hook mm/slub.c:1578 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1603
slab_free mm/slub.c:3163 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4230
io_wq_destroy+0x13e/0x2d0 fs/io-wq.c:1022
io_wq_put fs/io-wq.c:1032 [inline]
io_wq_put_and_exit+0x7a/0xa0 fs/io-wq.c:1038
io_uring_clean_tctx+0xed/0x160 fs/io_uring.c:8988
__io_uring_files_cancel+0x703/0x850 fs/io_uring.c:9053
io_uring_files_cancel include/linux/io_uring.h:22 [inline]
do_exit+0x299/0x2a60 kernel/exit.c:780
do_group_exit+0x125/0x310 kernel/exit.c:922
__do_sys_exit_group kernel/exit.c:933 [inline]
__se_sys_exit_group kernel/exit.c:931 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at 88801bf15000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 232 bytes inside of
1024-byte region [88801bf15000,
