From: syzbot <syzbot+a4c6e533af740abd3922@syzkaller.appspotmail.com>
To: andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org,
john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org,
kuba@kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, songliubraving@fb.com,
syzkaller-bugs@googlegroups.com, yhs@fb.com
Subject: BUG: unable to handle kernel NULL pointer dereference in bpf_prog_ADDR_L
Date: Sun, 05 Jul 2020 23:21:24 -0700 [thread overview]
Message-ID: <00000000000059437305a9bfe2a2@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: cb8e59cc Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1446cfd3100000
kernel config: https://syzkaller.appspot.com/x/.config?x=a16ddbc78955e3a9
dashboard link: https://syzkaller.appspot.com/bug?extid=a4c6e533af740abd3922
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a4c6e533af740abd3922@syzkaller.appspotmail.com
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 85748067 P4D 85748067 PUD 61918067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4768 Comm: syz-executor.0 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_prog_6df1c5236f32720a_L+0x1f/0xa18
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 7f 28 <48> 8b 7f 00 8b bf 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc90001ee7ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc900022ea000
RDX: 0000000000000230 RSI: ffffc90000cb8038 RDI: 0000000000000000
RBP: ffffc90001ee7ae8 R08: ffff88805dc5e200 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000cb8000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88805dc5e200
FS: 00007fc83e30f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008c0f4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
bpf_prog_run_xdp include/linux/filter.h:734 [inline]
bpf_test_run+0x226/0xc70 net/bpf/test_run.c:47
bpf_prog_test_run_xdp+0x2ca/0x510 net/bpf/test_run.c:507
bpf_prog_test_run kernel/bpf/syscall.c:2998 [inline]
__do_sys_bpf+0x28ce/0x4a80 kernel/bpf/syscall.c:4138
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45cb29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc83e30ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000004dade0 RCX: 000000000045cb29
RDX: 0000000000000040 RSI: 0000000020000040 RDI: 000000000000000a
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000005d R14: 00000000004c32db R15: 00007fc83e30f6d4
Modules linked in:
CR2: 0000000000000000
---[ end trace 6c5d2c7e681a670d ]---
RIP: 0010:bpf_prog_6df1c5236f32720a_L+0x1f/0xa18
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 7f 28 <48> 8b 7f 00 8b bf 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc90001ee7ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc900022ea000
RDX: 0000000000000230 RSI: ffffc90000cb8038 RDI: 0000000000000000
RBP: ffffc90001ee7ae8 R08: ffff88805dc5e200 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000cb8000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88805dc5e200
FS: 00007fc83e30f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008c0f4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
---
This bug 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@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
reply other threads:[~2020-07-06 6:21 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=00000000000059437305a9bfe2a2@google.com \
--to=syzbot+a4c6e533af740abd3922@syzkaller.appspotmail.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=hawk@kernel.org \
--cc=john.fastabend@gmail.com \
--cc=kafai@fb.com \
--cc=kpsingh@chromium.org \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=songliubraving@fb.com \
--cc=syzkaller-bugs@googlegroups.com \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).