[syzbot] [erofs?] general protection fault in erofs_bread (2)
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syzbot
May 17, 2023, 1:35:41 PM5/17/23
to ch...@kernel.org, huy...@coolpad.com, jeff...@linux.alibaba.com, linux...@lists.ozlabs.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, xi...@kernel.org
Hello,
syzbot found the following issue on:
HEAD commit: f1fcbaa18b28 Linux 6.4-rc2
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=114aa029280000
kernel config: https://syzkaller.appspot.com/x/.config?x=6beb6ffe4f59ef2a
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dd834e280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167ef106280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4adf207e9d5e/disk-f1fcbaa1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e7cce92f611/vmlinux-f1fcbaa1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cfd911b80f89/bzImage-f1fcbaa1.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a2583fbaaf14/mount_2.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbb353...@syzkaller.appspotmail.com
erofs: (device loop0): EXPERIMENTAL global deduplication feature in use. Use at your own risk!
general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 0 PID: 4995 Comm: syz-executor235 Not tainted 6.4.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:erofs_bread+0x56/0x6d0 fs/erofs/data.c:38
Code: 48 c1 ea 03 80 3c 02 00 0f 85 15 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 ca 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 82 05 00 00
RSP: 0018:ffffc900034b7980 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc900034b7af8 RCX: 0000000000000000
RDX: 0000000000000019 RSI: ffffffff83c1ea5f RDI: 00000000000000ca
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000003f
R10: 000000000000000c R11: ffffffff81d50f12 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888019bd4000 R15: ffff888019bd4000
FS: 0000555555bf6300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc664ae0ca0 CR3: 0000000020cc6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
erofs_read_metadata+0xbb/0x490 fs/erofs/super.c:137
erofs_xattr_prefixes_init+0x3b1/0x590 fs/erofs/xattr.c:684
erofs_fc_fill_super+0x1734/0x2a80 fs/erofs/super.c:825
get_tree_bdev+0x44a/0x770 fs/super.c:1303
vfs_get_tree+0x8d/0x350 fs/super.c:1510
do_new_mount fs/namespace.c:3039 [inline]
path_mount+0x134b/0x1e40 fs/namespace.c:3369
do_mount fs/namespace.c:3382 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3568
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: 0033:0x7fc664b09e5a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd1310be98 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fc664b09e5a
RDX: 0000000020000180 RSI: 0000000020000140 RDI: 00007ffd1310bea0
RBP: 00007ffd1310bea0 R08: 00007ffd1310bee0 R09: 00000000000001d4
R10: 0000000001000801 R11: 0000000000000286 R12: 0000000000000005
R13: 0000555555bf62c0 R14: 00007ffd1310bee0 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:erofs_bread+0x56/0x6d0 fs/erofs/data.c:38
Code: 48 c1 ea 03 80 3c 02 00 0f 85 15 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 ca 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 82 05 00 00
RSP: 0018:ffffc900034b7980 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc900034b7af8 RCX: 0000000000000000
RDX: 0000000000000019 RSI: ffffffff83c1ea5f RDI: 00000000000000ca
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000003f
R10: 000000000000000c R11: ffffffff81d50f12 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888019bd4000 R15: ffff888019bd4000
FS: 0000555555bf6300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0e8fdab10 CR3: 0000000020cc6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c1 ea 03 shr $0x3,%rdx
4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
8: 0f 85 15 06 00 00 jne 0x623
e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
15: fc ff df
18: 4c 8b 23 mov (%rbx),%r12
1b: 49 8d bc 24 ca 00 00 lea 0xca(%r12),%rdi
22: 00
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 48 89 fa mov %rdi,%rdx
31: 83 e2 07 and $0x7,%edx
34: 38 d0 cmp %dl,%al
36: 7f 08 jg 0x40
38: 84 c0 test %al,%al
3a: 0f 85 82 05 00 00 jne 0x5c2
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: f1fcbaa18b28 Linux 6.4-rc2
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=114aa029280000
kernel config: https://syzkaller.appspot.com/x/.config?x=6beb6ffe4f59ef2a
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dd834e280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167ef106280000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4adf207e9d5e/disk-f1fcbaa1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e7cce92f611/vmlinux-f1fcbaa1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cfd911b80f89/bzImage-f1fcbaa1.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a2583fbaaf14/mount_2.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbb353...@syzkaller.appspotmail.com
erofs: (device loop0): EXPERIMENTAL global deduplication feature in use. Use at your own risk!
general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 0 PID: 4995 Comm: syz-executor235 Not tainted 6.4.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:erofs_bread+0x56/0x6d0 fs/erofs/data.c:38
Code: 48 c1 ea 03 80 3c 02 00 0f 85 15 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 ca 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 82 05 00 00
RSP: 0018:ffffc900034b7980 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc900034b7af8 RCX: 0000000000000000
RDX: 0000000000000019 RSI: ffffffff83c1ea5f RDI: 00000000000000ca
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000003f
R10: 000000000000000c R11: ffffffff81d50f12 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888019bd4000 R15: ffff888019bd4000
FS: 0000555555bf6300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc664ae0ca0 CR3: 0000000020cc6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
erofs_read_metadata+0xbb/0x490 fs/erofs/super.c:137
erofs_xattr_prefixes_init+0x3b1/0x590 fs/erofs/xattr.c:684
erofs_fc_fill_super+0x1734/0x2a80 fs/erofs/super.c:825
get_tree_bdev+0x44a/0x770 fs/super.c:1303
vfs_get_tree+0x8d/0x350 fs/super.c:1510
do_new_mount fs/namespace.c:3039 [inline]
path_mount+0x134b/0x1e40 fs/namespace.c:3369
do_mount fs/namespace.c:3382 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3568
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: 0033:0x7fc664b09e5a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd1310be98 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fc664b09e5a
RDX: 0000000020000180 RSI: 0000000020000140 RDI: 00007ffd1310bea0
RBP: 00007ffd1310bea0 R08: 00007ffd1310bee0 R09: 00000000000001d4
R10: 0000000001000801 R11: 0000000000000286 R12: 0000000000000005
R13: 0000555555bf62c0 R14: 00007ffd1310bee0 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:erofs_bread+0x56/0x6d0 fs/erofs/data.c:38
Code: 48 c1 ea 03 80 3c 02 00 0f 85 15 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d bc 24 ca 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 82 05 00 00
RSP: 0018:ffffc900034b7980 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffc900034b7af8 RCX: 0000000000000000
RDX: 0000000000000019 RSI: ffffffff83c1ea5f RDI: 00000000000000ca
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000003f
R10: 000000000000000c R11: ffffffff81d50f12 R12: 0000000000000000
R13: 0000000000000001 R14: ffff888019bd4000 R15: ffff888019bd4000
FS: 0000555555bf6300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0e8fdab10 CR3: 0000000020cc6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c1 ea 03 shr $0x3,%rdx
4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
8: 0f 85 15 06 00 00 jne 0x623
e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
15: fc ff df
18: 4c 8b 23 mov (%rbx),%r12
1b: 49 8d bc 24 ca 00 00 lea 0xca(%r12),%rdi
22: 00
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 48 89 fa mov %rdi,%rdx
31: 83 e2 07 and $0x7,%edx
34: 38 d0 cmp %dl,%al
36: 7f 08 jg 0x40
38: 84 c0 test %al,%al
3a: 0f 85 82 05 00 00 jne 0x5c2
---
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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Gao Xiang
May 17, 2023, 2:15:21 PM5/17/23
to syzbot, ch...@kernel.org, huy...@coolpad.com, jeff...@linux.alibaba.com, linux...@lists.ozlabs.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, xi...@kernel.org
On 2023/5/18 10:35, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f1fcbaa18b28 Linux 6.4-rc2
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=114aa029280000
> kernel config: https://syzkaller.appspot.com/x/.config?x=6beb6ffe4f59ef2a
> dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dd834e280000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167ef106280000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/4adf207e9d5e/disk-f1fcbaa1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/9e7cce92f611/vmlinux-f1fcbaa1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/cfd911b80f89/bzImage-f1fcbaa1.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/a2583fbaaf14/mount_2.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+bbb353...@syzkaller.appspotmail.com
syzbot
May 17, 2023, 2:38:27 PM5/17/23
to ch...@kernel.org, hsia...@linux.alibaba.com, huy...@coolpad.com, jeff...@linux.alibaba.com, linux...@lists.ozlabs.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, xi...@kernel.org
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+bbb353...@syzkaller.appspotmail.com
Tested on:
commit: ae0bac79 erofs: avoid pcpubuf.c inclusion if CONFIG_ER..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git fixes
console output: https://syzkaller.appspot.com/x/log.txt?x=16793226280000
Note: testing is done by a robot and is best-effort only.
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+bbb353...@syzkaller.appspotmail.com
Tested on:
commit: ae0bac79 erofs: avoid pcpubuf.c inclusion if CONFIG_ER..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git fixes
console output: https://syzkaller.appspot.com/x/log.txt?x=16793226280000
kernel config: https://syzkaller.appspot.com/x/.config?x=6beb6ffe4f59ef2a
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Note: no patches were applied.
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Note: testing is done by a robot and is best-effort only.
syzbot
May 17, 2023, 8:06:26 PM5/17/23
to ch...@kernel.org, hsia...@linux.alibaba.com, huy...@coolpad.com, jeff...@linux.alibaba.com, linux...@lists.ozlabs.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, xi...@kernel.org
syzbot has bisected this issue to:
commit 6a318ccd7e083729cbcdbd174d7070f6b7d24130
Author: Jingbo Xu <jeff...@linux.alibaba.com>
Date: Fri Apr 7 22:28:08 2023 +0000
erofs: enable long extended attribute name prefixes
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=159afed9280000
start commit: f1fcbaa18b28 Linux 6.4-rc2
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=179afed9280000
console output: https://syzkaller.appspot.com/x/log.txt?x=139afed9280000
Fixes: 6a318ccd7e08 ("erofs: enable long extended attribute name prefixes")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 6a318ccd7e083729cbcdbd174d7070f6b7d24130
Author: Jingbo Xu <jeff...@linux.alibaba.com>
Date: Fri Apr 7 22:28:08 2023 +0000
erofs: enable long extended attribute name prefixes
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=159afed9280000
start commit: f1fcbaa18b28 Linux 6.4-rc2
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=179afed9280000
console output: https://syzkaller.appspot.com/x/log.txt?x=139afed9280000
kernel config: https://syzkaller.appspot.com/x/.config?x=6beb6ffe4f59ef2a
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb353775d51424087f2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dd834e280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167ef106280000
Reported-by: syzbot+bbb353...@syzkaller.appspotmail.com
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167ef106280000
Fixes: 6a318ccd7e08 ("erofs: enable long extended attribute name prefixes")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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