Hello,
syzbot found the following issue on:
HEAD commit: 80bd9028feca Add linux-next specific files for 20230131
git tree: linux-next
console output:
https://syzkaller.appspot.com/x/log.txt?x=151e8395480000
kernel config:
https://syzkaller.appspot.com/x/.config?x=904dc2f450eaad4a
dashboard link:
https://syzkaller.appspot.com/bug?extid=d4a3562dda559c6135ba
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [
and...@kernel.org a...@kernel.org b...@vger.kernel.org dan...@iogearbox.net da...@davemloft.net hao...@google.com ha...@kernel.org john.fa...@gmail.com jo...@kernel.org kps...@kernel.org ku...@kernel.org linux-...@vger.kernel.org marti...@linux.dev net...@vger.kernel.org s...@google.com so...@kernel.org y...@fb.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/924618188238/disk-80bd9028.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/7a03cf86e545/vmlinux-80bd9028.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/568e80043a41/bzImage-80bd9028.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+d4a356...@syzkaller.appspotmail.com
BUG: kernel NULL pointer dereference, address: 0000000000000470
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 4a9e8067 P4D 4a9e8067 PUD 5285b067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 23526 Comm: syz-executor.5 Not tainted 6.2.0-rc6-next-20230131-syzkaller-09515-g80bd9028feca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:memset_erms+0xd/0x20 arch/x86/lib/memset_64.S:66
Code: 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 66 0f 1f 00 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 66 0f 1f
RSP: 0018:ffffc90008d0fac8 EFLAGS: 00010246
RAX: 0000000000000800 RBX: ffffc90008d0fe28 RCX: 0000000000000010
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000470
RBP: ffffc90008d0fe18 R08: 0000000000000004 R09: 0000000000000470
R10: 000000000005f366 R11: 0000000000000000 R12: 0000000000000470
R13: ffffc90008ced000 R14: 0000000000000010 R15: ffff888054cd6000
FS: 00007fa734bfd700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000470 CR3: 000000007cdab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
bpf_obj_name_cpy+0x3b/0x1a0 kernel/bpf/syscall.c:961
bpf_prog_load+0x1686/0x21d0 kernel/bpf/syscall.c:2611
__sys_bpf+0x1435/0x5100 kernel/bpf/syscall.c:4977
__do_sys_bpf kernel/bpf/syscall.c:5081 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5079 [inline]
__x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5079
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: 0033:0x7fa73e48c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa734bfd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa73e5ac120 RCX: 00007fa73e48c0c9
RDX: 0000000000000080 RSI: 0000000020000900 RDI: 0000000000000005
RBP: 00007fa73e4e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffacc80d0f R14: 00007fa734bfd300 R15: 0000000000022000
</TASK>
Modules linked in:
CR2: 0000000000000470
---[ end trace 0000000000000000 ]---
RIP: 0010:memset_erms+0xd/0x20 arch/x86/lib/memset_64.S:66
Code: 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 66 0f 1f 00 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 66 0f 1f
RSP: 0018:ffffc90008d0fac8 EFLAGS: 00010246
RAX: 0000000000000800 RBX: ffffc90008d0fe28 RCX: 0000000000000010
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000470
RBP: ffffc90008d0fe18 R08: 0000000000000004 R09: 0000000000000470
R10: 000000000005f366 R11: 0000000000000000 R12: 0000000000000470
R13: ffffc90008ced000 R14: 0000000000000010 R15: ffff888054cd6000
FS: 00007fa734bfd700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000470 CR3: 000000007cdab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 48 0f af c6 imul %rsi,%rax
4: f3 48 ab rep stos %rax,%es:(%rdi)
7: 89 d1 mov %edx,%ecx
9: f3 aa rep stos %al,%es:(%rdi)
b: 4c 89 c8 mov %r9,%rax
e: c3 retq
f: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
16: 00 00 00 00
1a: 66 90 xchg %ax,%ax
1c: 66 0f 1f 00 nopw (%rax)
20: 49 89 f9 mov %rdi,%r9
23: 40 88 f0 mov %sil,%al
26: 48 89 d1 mov %rdx,%rcx
* 29: f3 aa rep stos %al,%es:(%rdi) <-- trapping instruction
2b: 4c 89 c8 mov %r9,%rax
2e: c3 retq
2f: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
36: 00 00 00 00
3a: 66 90 xchg %ax,%ax
3c: 66 data16
3d: 0f .byte 0xf
3e: 1f (bad)
---
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