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Date:   Tue, 5 Jul 2022 15:04:06 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+66d306fee539916084c2@...kaller.appspotmail.com>,
        andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        davem@...emloft.net, hawk@...nel.org, john.fastabend@...il.com,
        kafai@...com, kpsingh@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        netdev@...r.kernel.org, rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com, song@...nel.org
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in
 bpf_prog_ADDR_F

On 7/3/22 9:23 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    179a93f74b29 fprobe, samples: Add module parameter descrip..
> git tree:       bpf
> console output: https://syzkaller.appspot.com/x/log.txt?x=17bc8604080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=70e1a4d352a3c6ae
> dashboard link: https://syzkaller.appspot.com/bug?extid=66d306fee539916084c2
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.

Cc'ing Song, looks like UAF? Could potentially be related to the other triggered
warnings around the JIT from syzkaller recently.

> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+66d306fee539916084c2@...kaller.appspotmail.com
> 
> BUG: unable to handle page fault for address: ffffffffa0000a18
> #PF: supervisor instruction fetch in kernel mode
> #PF: error_code(0x0010) - not-present page
> PGD ba8f067 P4D ba8f067 PUD ba90063 PMD 1451e6067 PTE 0
> Oops: 0010 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 10814 Comm: syz-executor.2 Not tainted 5.19.0-rc2-syzkaller-00122-g179a93f74b29 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:bpf_prog_9d4bccaf8ccaf0dc_F+0x0/0xd
> Code: Unable to access opcode bytes at RIP 0xffffffffa00009ee.
> RSP: 0018:ffffc90003517250 EFLAGS: 00010046
> RAX: dffffc0000000000 RBX: ffffc90003563000 RCX: 0000000000000000
> RDX: 1ffff920006ac606 RSI: ffffc90003563048 RDI: 00000000ffff8880
> RBP: ffffc90003517258 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
> R13: ffff88802403bb00 R14: ffff88802fa60000 R15: 0000000000000001
> FS:  00007f63ca616700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffa00009ee CR3: 000000002f068000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
>   __bpf_prog_run include/linux/filter.h:628 [inline]
>   bpf_prog_run include/linux/filter.h:635 [inline]
>   __bpf_trace_run kernel/trace/bpf_trace.c:2046 [inline]
>   bpf_trace_run4+0x124/0x360 kernel/trace/bpf_trace.c:2085
>   __bpf_trace_sched_switch+0x115/0x160 include/trace/events/sched.h:222
>   __traceiter_sched_switch+0x68/0xb0 include/trace/events/sched.h:222
>   trace_sched_switch include/trace/events/sched.h:222 [inline]
>   __schedule+0x145b/0x4b30 kernel/sched/core.c:6425
>   preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6593
>   preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
>   __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
>   _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
>   spin_unlock include/linux/spinlock.h:389 [inline]
>   __cond_resched_lock+0x93/0xe0 kernel/sched/core.c:8270
>   __purge_vmap_area_lazy+0x976/0x1c50 mm/vmalloc.c:1728
>   _vm_unmap_aliases.part.0+0x3f0/0x500 mm/vmalloc.c:2125
>   _vm_unmap_aliases mm/vmalloc.c:2099 [inline]
>   vm_remove_mappings mm/vmalloc.c:2624 [inline]
>   __vunmap+0x6d5/0xd30 mm/vmalloc.c:2651
>   __vfree+0x3c/0xd0 mm/vmalloc.c:2713
>   vfree+0x5a/0x90 mm/vmalloc.c:2744
>   bpf_jit_binary_free kernel/bpf/core.c:1080 [inline]
>   bpf_jit_free+0x21a/0x2b0 kernel/bpf/core.c:1203
>   jit_subprogs kernel/bpf/verifier.c:13683 [inline]
>   fixup_call_args kernel/bpf/verifier.c:13712 [inline]
>   bpf_check+0x71ab/0xbbc0 kernel/bpf/verifier.c:15063
>   bpf_prog_load+0xfb2/0x2250 kernel/bpf/syscall.c:2575
>   __sys_bpf+0x11a1/0x5700 kernel/bpf/syscall.c:4917
>   __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
>   __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
>   __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5019
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x46/0xb0
> RIP: 0033:0x7f63c9489109
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f63ca616168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 00007f63c959c030 RCX: 00007f63c9489109
> RDX: 0000000000000070 RSI: 0000000020000440 RDI: 0000000000000005
> RBP: 00007f63c94e305d R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffde158863f R14: 00007f63ca616300 R15: 0000000000022000
>   </TASK>
> Modules linked in:
> CR2: ffffffffa0000a18
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:bpf_prog_9d4bccaf8ccaf0dc_F+0x0/0xd
> Code: Unable to access opcode bytes at RIP 0xffffffffa00009ee.
> RSP: 0018:ffffc90003517250 EFLAGS: 00010046
> 
> RAX: dffffc0000000000 RBX: ffffc90003563000 RCX: 0000000000000000
> RDX: 1ffff920006ac606 RSI: ffffc90003563048 RDI: 00000000ffff8880
> RBP: ffffc90003517258 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
> R13: ffff88802403bb00 R14: ffff88802fa60000 R15: 0000000000000001
> FS:  00007f63ca616700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffa00009ee CR3: 000000002f068000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 

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