syzbot


KASAN: use-after-free Write in pcrypt_aead_enc

Status: auto-closed as invalid on 2021/08/07 07:13
Reported-by: syzbot+f0c426bf1ad62725f6e3@syzkaller.appspotmail.com
First crash: 443d, last: 441d

Sample crash report:
EXT4-fs (loop5): mounted filesystem without journal. Opts: journal_dev=0x0000000000000000,,errors=continue
NILFS (loop4): invalid segment: Checksum error in segment payload
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
==================================================================
BUG: KASAN: use-after-free in pcrypt_aead_enc+0xc4/0xf0 crypto/pcrypt.c:142
Write of size 4 at addr ffff8880a2ed0db0 by task kworker/0:3/8965

CPU: 0 PID: 8965 Comm: kworker/0:3 Not tainted 4.14.229-syzkaller #0
NILFS (loop4): unable to fall back to spare super block
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_parallel_worker
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_store4_noabort+0x68/0x70 mm/kasan/report.c:434
 pcrypt_aead_enc+0xc4/0xf0 crypto/pcrypt.c:142
 padata_parallel_worker+0x202/0x2e0 kernel/padata.c:87
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 21998:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tls_push_record+0xfa/0x1270 net/tls/tls_sw.c:250
 tls_push_pending_closed_record net/tls/tls_main.c:205 [inline]
 tls_push_pending_closed_record+0xbc/0xf0 net/tls/tls_main.c:198
 tls_complete_pending_work include/net/tls.h:159 [inline]
 tls_sw_sendpage+0x7f8/0xb50 net/tls/tls_sw.c:563
 inet_sendpage+0x155/0x590 net/ipv4/af_inet.c:779
 kernel_sendpage net/socket.c:3407 [inline]
 sock_sendpage+0xdf/0x140 net/socket.c:871
 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x326/0x7a0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0xc1/0x110 fs/splice.c:832
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x27c/0x730 fs/splice.c:973
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x47f/0xb30 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1502 [inline]
 SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 21998:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 tls_push_record+0xc3b/0x1270 net/tls/tls_sw.c:293
 tls_push_pending_closed_record net/tls/tls_main.c:205 [inline]
 tls_push_pending_closed_record+0xbc/0xf0 net/tls/tls_main.c:198
 tls_complete_pending_work include/net/tls.h:159 [inline]
 tls_sw_sendpage+0x7f8/0xb50 net/tls/tls_sw.c:563
 inet_sendpage+0x155/0x590 net/ipv4/af_inet.c:779
 kernel_sendpage net/socket.c:3407 [inline]
 sock_sendpage+0xdf/0x140 net/socket.c:871
 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x326/0x7a0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0xc1/0x110 fs/splice.c:832
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x27c/0x730 fs/splice.c:973
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x47f/0xb30 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1502 [inline]
 SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880a2ed0d40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 112 bytes inside of
 512-byte region [ffff8880a2ed0d40, ffff8880a2ed0f40)
The buggy address belongs to the page:
page:ffffea00028bb400 count:1 mapcount:0 mapping:ffff8880a2ed00c0 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880a2ed00c0 0000000000000000 0000000100000006
raw: ffffea0002c2e6a0 ffffea000282eba0 ffff88813fe80940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a2ed0c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a2ed0d00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880a2ed0d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8880a2ed0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a2ed0e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2021/04/09 07:12 linux-4.14.y 0cc244011f40 6a81331a .config log report info KASAN: use-after-free Write in pcrypt_aead_enc
ci2-linux-4-14 2021/04/07 21:40 linux-4.14.y 0cc244011f40 6a81331a .config log report info KASAN: use-after-free Write in pcrypt_aead_enc