general protection fault in bpf_prog_load

[syzbot]

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=17065179480000
kernel config: https://syzkaller.appspot.com/x/.config?x=904dc2f450eaad4a
dashboard link: https://syzkaller.appspot.com/bug?extid=d816006fc8166bf28540
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+d81600...@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: 10040 Comm: syz-executor.3 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:bpf_prog_load+0x828/0x21d0 kernel/bpf/syscall.c:2566
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 38 17 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 38 49 8d 7e 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 17 00 00 48 8b 4c 24 28 4d 89 6e 40 48 b8 00
RSP: 0018:ffffc90006f47b20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc90006d19000 RCX: ffffc90006f47e2c
RDX: 0000000000000008 RSI: ffffffff81939d53 RDI: 0000000000000040
RBP: ffffc90006f47cd8 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: ffffc90006f47de8
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000d
FS: 00007f491a0a6700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31c22000 CR3: 000000007cbc4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__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: 0033:0x7f491928c0c9
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:00007f491a0a6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f49193abf80 RCX: 00007f491928c0c9
RDX: 0000000000000023 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007f49192e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd511cbc9f R14: 00007f491a0a6300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bpf_prog_load+0x828/0x21d0 kernel/bpf/syscall.c:2566
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 38 17 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 38 49 8d 7e 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 17 00 00 48 8b 4c 24 28 4d 89 6e 40 48 b8 00
RSP: 0018:ffffc90006f47b20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc90006d19000 RCX: ffffc90006f47e2c
RDX: 0000000000000008 RSI: ffffffff81939d53 RDI: 0000000000000040
RBP: ffffc90006f47cd8 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: ffffc90006f47de8
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000d
FS: 00007f491a0a6700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31b31000 CR3: 000000007cbc4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 89 fa mov %rdi,%rdx
3: 48 c1 ea 03 shr $0x3,%rdx
7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
b: 0f 85 38 17 00 00 jne 0x1749
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 4c 8b 73 38 mov 0x38(%rbx),%r14
1f: 49 8d 7e 40 lea 0x40(%r14),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 1f 17 00 00 jne 0x1753
34: 48 8b 4c 24 28 mov 0x28(%rsp),%rcx
39: 4d 89 6e 40 mov %r13,0x40(%r14)
3d: 48 rex.W
3e: b8 .byte 0xb8


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.