From: syzbot <syzbot+a67fc5321ffb4b311c98@syzkaller.appspotmail.com>
To: amir73il@gmail.com, brauner@kernel.org, jlayton@kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-unionfs@vger.kernel.org, miklos@szeredi.hu,
syzkaller-bugs@googlegroups.com, zohar@linux.ibm.com
Subject: Re: [syzbot] [overlayfs?] general protection fault in d_path
Date: Tue, 12 Sep 2023 15:10:53 -0700 [thread overview]
Message-ID: <0000000000005bd097060530b758@google.com> (raw)
In-Reply-To: <0000000000004f34d705ffbc2604@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: a747acc0b752 Merge tag 'linux-kselftest-next-6.6-rc2' of g..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11c82308680000
kernel config: https://syzkaller.appspot.com/x/.config?x=df91a3034fe3f122
dashboard link: https://syzkaller.appspot.com/bug?extid=a67fc5321ffb4b311c98
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1671b694680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ec94d8680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b28ecb88c714/disk-a747acc0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/03dd2cd5356f/vmlinux-a747acc0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/63365d9bf980/bzImage-a747acc0.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a67fc5321ffb4b311c98@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 5030 Comm: syz-executor173 Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:275 [inline]
RIP: 0010:get_fs_root_rcu fs/d_path.c:244 [inline]
RIP: 0010:d_path+0x2f0/0x6e0 fs/d_path.c:286
Code: 30 00 74 08 48 89 df e8 be 20 e1 ff 4c 8b 23 4d 8d 6c 24 48 49 81 c4 88 00 00 00 4c 89 eb 48 c1 eb 03 4c 89 ef e8 00 1e 00 00 <42> 0f b6 04 33 84 c0 0f 85 89 00 00 00 45 8b 7d 00 44 89 fe 83 e6
RSP: 0018:ffffc90003a7eee0 EFLAGS: 00010246
RAX: 7e73051ae5315e00 RBX: 0000000000000009 RCX: ffff88807da73b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003a7eff0 R08: ffffffff82068d08 R09: 1ffffffff1d34ccd
R10: dffffc0000000000 R11: fffffbfff1d34cce R12: 0000000000000088
R13: 0000000000000048 R14: dffffc0000000000 R15: ffff8880206d8000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f351862ebb8 CR3: 00000000276a7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
audit_log_d_path+0xd3/0x310 kernel/audit.c:2138
dump_common_audit_data security/lsm_audit.c:224 [inline]
common_lsm_audit+0x7cf/0x1a90 security/lsm_audit.c:458
smack_log+0x421/0x540 security/smack/smack_access.c:383
smk_tskacc+0x2ff/0x360 security/smack/smack_access.c:253
smack_inode_getattr+0x203/0x270 security/smack/smack_lsm.c:1271
security_inode_getattr+0xd3/0x120 security/security.c:2153
vfs_getattr+0x2a/0x3a0 fs/stat.c:206
ovl_getattr+0x1b1/0xf70 fs/overlayfs/inode.c:174
ima_check_last_writer security/integrity/ima/ima_main.c:171 [inline]
ima_file_free+0x26e/0x4b0 security/integrity/ima/ima_main.c:203
__fput+0x36a/0x910 fs/file_table.c:378
task_work_run+0x24a/0x300 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x68f/0x2290 kernel/exit.c:874
do_group_exit+0x206/0x2c0 kernel/exit.c:1024
get_signal+0x175d/0x1840 kernel/signal.c:2892
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f35185d8529
Code: Unable to access opcode bytes at 0x7f35185d84ff.
RSP: 002b:00007f3518599218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f3518662308 RCX: 00007f35185d8529
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f351866230c
RBP: 00007f3518662300 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f351862f064
R13: 0031656c69662f2e R14: 6e6f3d7865646e69 R15: 0079616c7265766f
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:275 [inline]
RIP: 0010:get_fs_root_rcu fs/d_path.c:244 [inline]
RIP: 0010:d_path+0x2f0/0x6e0 fs/d_path.c:286
Code: 30 00 74 08 48 89 df e8 be 20 e1 ff 4c 8b 23 4d 8d 6c 24 48 49 81 c4 88 00 00 00 4c 89 eb 48 c1 eb 03 4c 89 ef e8 00 1e 00 00 <42> 0f b6 04 33 84 c0 0f 85 89 00 00 00 45 8b 7d 00 44 89 fe 83 e6
RSP: 0018:ffffc90003a7eee0 EFLAGS: 00010246
RAX: 7e73051ae5315e00 RBX: 0000000000000009 RCX: ffff88807da73b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003a7eff0 R08: ffffffff82068d08 R09: 1ffffffff1d34ccd
R10: dffffc0000000000 R11: fffffbfff1d34cce R12: 0000000000000088
R13: 0000000000000048 R14: dffffc0000000000 R15: ffff8880206d8000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f351862ebb8 CR3: 000000007e769000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 30 00 xor %al,(%rax)
2: 74 08 je 0xc
4: 48 89 df mov %rbx,%rdi
7: e8 be 20 e1 ff call 0xffe120ca
c: 4c 8b 23 mov (%rbx),%r12
f: 4d 8d 6c 24 48 lea 0x48(%r12),%r13
14: 49 81 c4 88 00 00 00 add $0x88,%r12
1b: 4c 89 eb mov %r13,%rbx
1e: 48 c1 eb 03 shr $0x3,%rbx
22: 4c 89 ef mov %r13,%rdi
25: e8 00 1e 00 00 call 0x1e2a
* 2a: 42 0f b6 04 33 movzbl (%rbx,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 89 00 00 00 jne 0xc0
37: 45 8b 7d 00 mov 0x0(%r13),%r15d
3b: 44 89 fe mov %r15d,%esi
3e: 83 .byte 0x83
3f: e6 .byte 0xe6
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
next prev parent reply other threads:[~2023-09-12 22:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-05 12:00 [syzbot] [overlayfs?] general protection fault in d_path syzbot
2023-07-05 13:05 ` Christian Brauner
2023-07-05 13:39 ` Amir Goldstein
2023-07-05 13:41 ` Jeff Layton
2023-07-05 13:54 ` Amir Goldstein
2023-07-05 14:10 ` Jeff Layton
2023-09-12 22:10 ` syzbot [this message]
2023-09-13 7:09 ` Amir Goldstein
2023-09-13 9:06 ` [syzbot] [integrity] [overlayfs] " syzbot
2023-09-14 17:54 ` Mimi Zohar
2023-09-18 0:04 ` syzbot
2023-09-20 17:01 ` Stefan Berger
2023-09-20 20:37 ` Stefan Berger
2023-09-20 21:16 ` Jeff Layton
2023-09-20 22:09 ` Stefan Berger
2023-09-21 0:10 ` Stefan Berger
2023-09-21 0:52 ` Casey Schaufler
2023-09-21 10:32 ` Jeff Layton
2023-09-21 11:24 ` Mimi Zohar
2023-09-21 11:48 ` Christian Brauner
2023-09-21 14:29 ` Stefan Berger
2023-09-21 14:52 ` Mimi Zohar
2023-09-21 15:10 ` Jeff Layton
2023-09-21 15:18 ` Amir Goldstein
2023-09-21 15:19 ` Mimi Zohar
2023-09-21 15:39 ` Jeff Layton
2023-09-21 16:06 ` Mimi Zohar
2023-09-21 17:01 ` Amir Goldstein
2023-09-26 14:40 ` Mimi Zohar
2023-09-29 4:30 ` Amir Goldstein
2023-09-28 22:03 ` Stefan Berger
2023-09-29 4:25 ` Amir Goldstein
2023-09-29 12:39 ` Stefan Berger
2023-10-01 14:51 ` Amir Goldstein
2023-09-21 12:03 ` Amir Goldstein
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=0000000000005bd097060530b758@google.com \
--to=syzbot+a67fc5321ffb4b311c98@syzkaller.appspotmail.com \
--cc=amir73il@gmail.com \
--cc=brauner@kernel.org \
--cc=jlayton@kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-unionfs@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=syzkaller-bugs@googlegroups.com \
--cc=zohar@linux.ibm.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).