syzbot


BUG: unable to handle kernel

Status: upstream: reported C repro on 2019/10/25 23:52
Reported-by: syzbot+52f60d8337425a264f7e@syzkaller.appspotmail.com
First crash: 1696d, last: 1279d
Fix bisection the fix commit could be any of (bisect log):
  b98aebd29824 Linux 4.14.150
  56dfe6252c68 Linux 4.14.188
  
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel (3) mm C 2 2175d 2211d 0/27 closed as invalid on 2019/06/10 23:32
upstream BUG: unable to handle kernel (2) net syz 1 2273d 2273d 5/27 fixed on 2018/04/06 16:37
upstream BUG: unable to handle kernel 1 2478d 2478d 0/27 closed as invalid on 2017/09/03 08:49
Last patch testing requests (4)
Created Duration User Patch Repo Result
2023/02/06 04:32 9m retest repro linux-4.14.y report log
2023/02/06 03:32 9m retest repro linux-4.14.y report log
2022/09/15 14:29 10m retest repro linux-4.14.y report log
2022/09/15 13:29 11m retest repro linux-4.14.y report log
Fix bisection attempts (8)
Created Duration User Patch Repo Result
2020/07/11 02:11 30m bisect fix linux-4.14.y job log (2)
2020/06/11 01:44 23m bisect fix linux-4.14.y job log (0) log
2020/05/12 01:05 26m bisect fix linux-4.14.y job log (0) log
2020/04/12 00:39 23m bisect fix linux-4.14.y job log (0) log
2020/03/13 00:12 26m bisect fix linux-4.14.y job log (0) log
2020/02/11 23:38 23m bisect fix linux-4.14.y job log (0) log
2020/01/12 16:58 23m bisect fix linux-4.14.y job log (0) log
2019/12/13 16:00 23m bisect fix linux-4.14.y job log (0) log

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
kauditd_printk_skb: 10 callbacks suppressed
audit: type=1400 audit(1572043682.545:36): avc:  denied  { map } for  pid=6730 comm="syz-executor888" path="/root/syz-executor888363741" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: unable to handle kernel 
BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:347 [inline]
BUG: KASAN: null-ptr-deref in llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
NULL pointer dereference at           (null)
Read of size 63 at addr           (null) by task syz-executor888/6739
IP: memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54

PGD 9bc60067 
CPU: 0 PID: 6739 Comm: syz-executor888 Not tainted 4.14.150 #0
P4D 9bc60067 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
PUD 9207a067 
Call Trace:
PMD 0 
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
Oops: 0000 [#1] PREEMPT SMP KASAN
 kasan_report_error mm/kasan/report.c:349 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0x127/0x2af mm/kasan/report.c:393
Modules linked in:
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memcpy+0x24/0x50 mm/kasan/kasan.c:302
CPU: 1 PID: 6737 Comm: syz-executor888 Not tainted 4.14.150 #0
 memcpy include/linux/string.h:347 [inline]
 llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 sock_getsockopt+0xc0d/0x1840 net/core/sock.c:1276
task: ffff88808d2ae340 task.stack: ffff8880a7100000
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
RSP: 0018:ffff8880a7107bf8 EFLAGS: 00010246
RAX: ffff8880a7107d82 RBX: ffff8880a7107d70 RCX: 000000000000003f
 SYSC_getsockopt net/socket.c:1892 [inline]
 SyS_getsockopt+0x1bd/0x1e0 net/socket.c:1878
RDX: 000000000000003f RSI: 0000000000000000 RDI: ffff8880a7107d82
RBP: ffff8880a7107c18 R08: 1ffff11014e20fb0 R09: ffffed1014e20fb9
R10: ffffed1014e20fb8 R11: ffff8880a7107dc0 R12: 000000000000003f
R13: ffff8880a7107d82 R14: 0000000000000000 R15: ffff8880946e19c0
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
FS:  0000000001df2880(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
CR2: 0000000000000000 CR3: 0000000091656000 CR4: 00000000001406e0
RIP: 0033:0x4412b9
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
RSP: 002b:00007fff17f81598 EFLAGS: 00000246
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 ORIG_RAX: 0000000000000037
Call Trace:
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412b9
RDX: 000000000000001c RSI: 0000000000000001 RDI: 0000000000000003
 memcpy include/linux/string.h:347 [inline]
 llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
RBP: 00000000006cb018 R08: 0000000020000140 R09: 00000000004002c8
 sock_getsockopt+0xc0d/0x1840 net/core/sock.c:1276
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402030
R13: 00000000004020c0 R14: 0000000000000000 R15: 0000000000000000
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/10/25 22:51 linux-4.14.y b98aebd29824 04ca72cd .config console log report syz C ci2-linux-4-14
2020/12/15 15:04 linux-4.14.y 3f2ecb86cb90 97183ed7 .config console log report syz ci2-linux-4-14
* Struck through repros no longer work on HEAD.