Hello,
syzbot found the following issue on:
HEAD commit: a27512601c2d Merge 5.10.194 into android13-5.10-lts
git tree: android13-5.10-lts
console+strace:
https://syzkaller.appspot.com/x/log.txt?x=117c3bc5680000
kernel config:
https://syzkaller.appspot.com/x/.config?x=c1c2ce51f851d2f6
dashboard link:
https://syzkaller.appspot.com/bug?extid=09b752dc0e5d19163145
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=14718e91680000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=168876b1680000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/da4c10f4a7cd/disk-a2751260.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/4d65589a1227/vmlinux-a2751260.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/a8c5b14df758/bzImage-a2751260.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+09b752...@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 310 Comm: syz-executor384 Not tainted 5.10.194-syzkaller-00508-ga27512601c2d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:vfs_rename+0x103/0xda0 fs/namei.c:4376
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 e5 09 f4 ff 48 8b 03 48 89 44 24 48 4c 89 74 24 20 4d 8d 7e 30 4d 89 fe 49 c1 ee 03 <43> 80 3c 26 00 74 08 4c 89 ff e8 be 09 f4 ff 49 8b 07 48 89 44 24
RSP: 0018:ffffc90000b57ba0 EFLAGS: 00010202
RAX: ffff88811c4dc000 RBX: ffff88811c49a360 RCX: ffff88811e70e2c0
RDX: ffff88811e70e2c0 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90000b57cf0 R08: ffffffff81b3eaac R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c4de880 R14: 0000000000000008 R15: 0000000000000040
FS: 00007fb5681616c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb56811fd58 CR3: 000000011e256000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_renameat2+0x88d/0x1130 fs/namei.c:4605
__do_sys_rename fs/namei.c:4656 [inline]
__se_sys_rename fs/namei.c:4654 [inline]
__x64_sys_rename+0x86/0x90 fs/namei.c:4654
do_syscall_64+0x34/0x70
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb5681a1069
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb568161218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fb568231408 RCX: 00007fb5681a1069
RDX: 00007fb5681a1069 RSI: 0000000020000140 RDI: 0000000020000100
RBP: 00007fb568231400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb5681fe114
R13: 0030656c69662f2e R14: 00007fb5681f8045 R15: 00007fb5681fc110
Modules linked in:
---[ end trace b8aeb2cba33e1144 ]---
RIP: 0010:vfs_rename+0x103/0xda0 fs/namei.c:4376
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 e5 09 f4 ff 48 8b 03 48 89 44 24 48 4c 89 74 24 20 4d 8d 7e 30 4d 89 fe 49 c1 ee 03 <43> 80 3c 26 00 74 08 4c 89 ff e8 be 09 f4 ff 49 8b 07 48 89 44 24
RSP: 0018:ffffc90000b57ba0 EFLAGS: 00010202
RAX: ffff88811c4dc000 RBX: ffff88811c49a360 RCX: ffff88811e70e2c0
RDX: ffff88811e70e2c0 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90000b57cf0 R08: ffffffff81b3eaac R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c4de880 R14: 0000000000000008 R15: 0000000000000040
FS: 00007fb5681616c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb56811fd58 CR3: 000000011e256000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
8: 74 08 je 0x12
a: 48 89 df mov %rbx,%rdi
d: e8 e5 09 f4 ff call 0xfff409f7
12: 48 8b 03 mov (%rbx),%rax
15: 48 89 44 24 48 mov %rax,0x48(%rsp)
1a: 4c 89 74 24 20 mov %r14,0x20(%rsp)
1f: 4d 8d 7e 30 lea 0x30(%r14),%r15
23: 4d 89 fe mov %r15,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 26 00 cmpb $0x0,(%r14,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 be 09 f4 ff call 0xfff409f7
39: 49 8b 07 mov (%r15),%rax
3c: 48 rex.W
3d: 89 .byte 0x89
3e: 44 rex.R
3f: 24 .byte 0x24
---
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