From: syzbot <syzbot+3db80bbf66b88d68af9d@syzkaller.appspotmail.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
Date: Mon, 28 Sep 2020 00:36:15 -0700 [thread overview]
Message-ID: <000000000000b0bbc905b05ab8d5@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 7c7ec322 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17289773900000
kernel config: https://syzkaller.appspot.com/x/.config?x=240e2ebab67245c7
dashboard link: https://syzkaller.appspot.com/bug?extid=3db80bbf66b88d68af9d
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3db80bbf66b88d68af9d@syzkaller.appspotmail.com
REISERFS (device loop1): Using r5 hash to sort names
REISERFS (device loop1): using 3.5.x disk format
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD a7454067 P4D a7454067 PUD 93380067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9128 Comm: syz-executor.1 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90008bbf910 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff92001177f25 RCX: ffffc9000aad7000
RDX: 0000000000000000 RSI: ffff888085c9f330 RDI: ffff88804358f7e0
RBP: ffffffff889c4280 R08: 0000000000000001 R09: ffffffff8d461a7f
R10: 0000000000000000 R11: 000000000005f088 R12: ffff888085c9f330
R13: ffff88804358f7e0 R14: ffffc90008bbfaa0 R15: ffffc90008bbf948
FS: 00007f6bb6cc7700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a75b9000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lookup_slow+0x24c/0x480 fs/namei.c:1544
lookup_one_len+0x163/0x190 fs/namei.c:2562
reiserfs_lookup_privroot+0x92/0x280 fs/reiserfs/xattr.c:972
reiserfs_fill_super+0x211b/0x2df3 fs/reiserfs/super.c:2176
mount_bdev+0x32e/0x3f0 fs/super.c:1417
legacy_get_tree+0x105/0x220 fs/fs_context.c:592
vfs_get_tree+0x89/0x2f0 fs/super.c:1547
do_new_mount fs/namespace.c:2875 [inline]
path_mount+0x1387/0x20a0 fs/namespace.c:3192
do_mount fs/namespace.c:3205 [inline]
__do_sys_mount fs/namespace.c:3413 [inline]
__se_sys_mount fs/namespace.c:3390 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3390
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460bca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f6bb6cc6a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6bb6cc6b20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f6bb6cc6ae0
RBP: 00007f6bb6cc6ae0 R08: 00007f6bb6cc6b20 R09: 0000000020000000
R10: 0000000000a04850 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000040
Modules linked in:
CR2: 0000000000000000
---[ end trace 79d7e2c3db21cbd3 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90008bbf910 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff92001177f25 RCX: ffffc9000aad7000
RDX: 0000000000000000 RSI: ffff888085c9f330 RDI: ffff88804358f7e0
RBP: ffffffff889c4280 R08: 0000000000000001 R09: ffffffff8d461a7f
R10: 0000000000000000 R11: 000000000005f088 R12: ffff888085c9f330
R13: ffff88804358f7e0 R14: ffffc90008bbfaa0 R15: ffffc90008bbf948
FS: 00007f6bb6cc7700(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558411c291f8 CR3: 00000000a75b9000 CR4: 00000000001526e0
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@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
next reply other threads:[~2020-09-28 7:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 7:36 syzbot [this message]
2020-12-10 4:34 ` BUG: unable to handle kernel NULL pointer dereference in __lookup_slow syzbot
2021-01-09 7:20 ` syzbot
2021-01-11 11:14 ` Dmitry Vyukov
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=000000000000b0bbc905b05ab8d5@google.com \
--to=syzbot+3db80bbf66b88d68af9d@syzkaller.appspotmail.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=viro@zeniv.linux.org.uk \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.