[syzbot] general protection fault in exfat_fill

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* [syzbot] general protection fault in exfat_fill_super
@ 2022-10-24  9:56 syzbot
       [not found] ` <CAKYAXd_sNEM1KE=Tom-htUsvw5h-iF+M+arzjP7uPYLEcJQ+tw@mail.gmail.com>
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2022-10-24  9:56 UTC (permalink / raw)
  To: linkinjeon, linux-fsdevel, linux-kernel, sj1557.seo,
	syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    4d48f589d294 Add linux-next specific files for 20221021
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fc516e880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2c4b7d600a5739a6
dashboard link: https://syzkaller.appspot.com/bug?extid=74fa8cb75d0a18df4790
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=1056a9b4880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14613b3c880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0c86bd0b39a0/disk-4d48f589.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/074059d37f1f/vmlinux-4d48f589.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6d392b37ac66/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+74fa8cb75d0a18df4790@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 4096
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3610 Comm: syz-executor183 Not tainted 6.1.0-rc1-next-20221021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
RIP: 0010:strcmp+0x35/0xb0 lib/string.c:281
Code: df 41 54 55 53 48 89 fb 48 83 ec 08 eb 08 40 84 ed 74 5d 4c 89 e6 48 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48
RSP: 0018:ffffc90003e3fbd8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff89e65300 RDI: 0000000000000000
RBP: ffffc90003e3fd38 R08: 0000000000000005 R09: 0000000000000100
R10: 0000000000000100 R11: 1ffffffff17b2629 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880766a6000 R15: 0000000000000100
FS:  0000555556f6b300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005d84c8 CR3: 0000000072c9f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 exfat_fill_super+0x16d0/0x2990 fs/exfat/super.c:659
 get_tree_bdev+0x440/0x760 fs/super.c:1324
 vfs_get_tree+0x89/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 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+0x63/0xcd
RIP: 0033:0x7fa8d401085a
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:00007ffdbcd10b08 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fa8d401085a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdbcd10b20
RBP: 00007ffdbcd10b20 R08: 00007ffdbcd10b60 R09: 0000555556f6b2c0
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffdbcd10b60 R14: 000000000000001d R15: 00000000200004b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strcmp+0x35/0xb0 lib/string.c:281
Code: df 41 54 55 53 48 89 fb 48 83 ec 08 eb 08 40 84 ed 74 5d 4c 89 e6 48 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48
RSP: 0018:ffffc90003e3fbd8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff89e65300 RDI: 0000000000000000
RBP: ffffc90003e3fd38 R08: 0000000000000005 R09: 0000000000000100
R10: 0000000000000100 R11: 1ffffffff17b2629 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880766a6000 R15: 0000000000000100
FS:  0000555556f6b300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005d84c8 CR3: 0000000072c9f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	df 41 54             	filds  0x54(%rcx)
   3:	55                   	push   %rbp
   4:	53                   	push   %rbx
   5:	48 89 fb             	mov    %rdi,%rbx
   8:	48 83 ec 08          	sub    $0x8,%rsp
   c:	eb 08                	jmp    0x16
   e:	40 84 ed             	test   %bpl,%bpl
  11:	74 5d                	je     0x70
  13:	4c 89 e6             	mov    %r12,%rsi
  16:	48 89 df             	mov    %rbx,%rdi
  19:	48 83 c3 01          	add    $0x1,%rbx
  1d:	48 89 f8             	mov    %rdi,%rax
  20:	48 89 fa             	mov    %rdi,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	38 d0                	cmp    %dl,%al
  31:	7f 04                	jg     0x37
  33:	84 c0                	test   %al,%al
  35:	75 50                	jne    0x87
  37:	0f b6 6b ff          	movzbl -0x1(%rbx),%ebp
  3b:	4c 8d 66 01          	lea    0x1(%rsi),%r12
  3f:	48                   	rex.W


---
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.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 2+ messages in thread

[parent not found: <CAKYAXd_sNEM1KE=Tom-htUsvw5h-iF+M+arzjP7uPYLEcJQ+tw@mail.gmail.com>]

* Re: [syzbot] general protection fault in exfat_fill_super
       [not found] ` <CAKYAXd_sNEM1KE=Tom-htUsvw5h-iF+M+arzjP7uPYLEcJQ+tw@mail.gmail.com>
@ 2022-12-01 13:27   ` Dmitry Vyukov
  0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Vyukov @ 2022-12-01 13:27 UTC (permalink / raw)
  To: Namjae Jeon; +Cc: syzbot, sj1557.seo, syzkaller-bugs, linux-fsdevel, LKML

On Wed, 30 Nov 2022 at 16:17, Namjae Jeon <linkinjeon@kernel.org> wrote:
>
> Hello,
>
> I have tried to reproduce this issue using syzkaller and your
> testcase(C reproducer)
>
> root@syzkaller:~# ./repro
> [ 4278.566005] loop0: detected capacity change from 0 to 4096
> [ 4278.570538] exfat: Bad value for 'iocharset
>
> But I can't see kernel oops or KASAN logs.
> Could you pleaes confirm that you can still reproduce this ?

Hi Namjae,

This was reported by a robot, it won't understand such a request.
But you can see all the info it has about the bug on the dashboard
page (when it happened, how many times, on what commits, etc):
https://syzkaller.appspot.com/bug?extid=74fa8cb75d0a18df4790

I am assuming you used the provided kernel commit and config. If you
can't reproduce it, but need it for debugging/testing, you can ask
syzbot to test your patches.

> Thanks!
>
> 2022-10-24 18:56 GMT+09:00, syzbot
> <syzbot+74fa8cb75d0a18df4790@syzkaller.appspotmail.com>:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    4d48f589d294 Add linux-next specific files for 20221021
> > git tree:       linux-next
> > console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fc516e880000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=2c4b7d600a5739a6
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=74fa8cb75d0a18df4790
> > 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=1056a9b4880000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14613b3c880000
> >
> > Downloadable assets:
> > disk image:
> > https://storage.googleapis.com/syzbot-assets/0c86bd0b39a0/disk-4d48f589.raw.xz
> > vmlinux:
> > https://storage.googleapis.com/syzbot-assets/074059d37f1f/vmlinux-4d48f589.xz
> > mounted in repro:
> > https://storage.googleapis.com/syzbot-assets/6d392b37ac66/mount_0.gz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the
> > commit:
> > Reported-by: syzbot+74fa8cb75d0a18df4790@syzkaller.appspotmail.com
> >
> > loop0: detected capacity change from 0 to 4096
> > general protection fault, probably for non-canonical address
> > 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
> > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> > CPU: 0 PID: 3610 Comm: syz-executor183 Not tainted
> > 6.1.0-rc1-next-20221021-syzkaller #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 10/11/2022
> > RIP: 0010:strcmp+0x35/0xb0 lib/string.c:281
> > Code: df 41 54 55 53 48 89 fb 48 83 ec 08 eb 08 40 84 ed 74 5d 4c 89 e6 48
> > 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38
> > d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48
> > RSP: 0018:ffffc90003e3fbd8 EFLAGS: 00010246
> > RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
> > RDX: 0000000000000000 RSI: ffffffff89e65300 RDI: 0000000000000000
> > RBP: ffffc90003e3fd38 R08: 0000000000000005 R09: 0000000000000100
> > R10: 0000000000000100 R11: 1ffffffff17b2629 R12: 0000000000000000
> > R13: dffffc0000000000 R14: ffff8880766a6000 R15: 0000000000000100
> > FS:  0000555556f6b300(0000) GS:ffff8880b9a00000(0000)
> > knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00000000005d84c8 CR3: 0000000072c9f000 CR4: 00000000003506f0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> >  <TASK>
> >  exfat_fill_super+0x16d0/0x2990 fs/exfat/super.c:659
> >  get_tree_bdev+0x440/0x760 fs/super.c:1324
> >  vfs_get_tree+0x89/0x2f0 fs/super.c:1531
> >  do_new_mount fs/namespace.c:3040 [inline]
> >  path_mount+0x1326/0x1e20 fs/namespace.c:3370
> >  do_mount fs/namespace.c:3383 [inline]
> >  __do_sys_mount fs/namespace.c:3591 [inline]
> >  __se_sys_mount fs/namespace.c:3568 [inline]
> >  __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
> >  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+0x63/0xcd
> > RIP: 0033:0x7fa8d401085a
> > 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:00007ffdbcd10b08 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
> > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fa8d401085a
> > RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdbcd10b20
> > RBP: 00007ffdbcd10b20 R08: 00007ffdbcd10b60 R09: 0000555556f6b2c0
> > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
> > R13: 00007ffdbcd10b60 R14: 000000000000001d R15: 00000000200004b8
> >  </TASK>
> > Modules linked in:
> > ---[ end trace 0000000000000000 ]---
> > RIP: 0010:strcmp+0x35/0xb0 lib/string.c:281
> > Code: df 41 54 55 53 48 89 fb 48 83 ec 08 eb 08 40 84 ed 74 5d 4c 89 e6 48
> > 89 df 48 83 c3 01 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38
> > d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48
> > RSP: 0018:ffffc90003e3fbd8 EFLAGS: 00010246
> > RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
> > RDX: 0000000000000000 RSI: ffffffff89e65300 RDI: 0000000000000000
> > RBP: ffffc90003e3fd38 R08: 0000000000000005 R09: 0000000000000100
> > R10: 0000000000000100 R11: 1ffffffff17b2629 R12: 0000000000000000
> > R13: dffffc0000000000 R14: ffff8880766a6000 R15: 0000000000000100
> > FS:  0000555556f6b300(0000) GS:ffff8880b9a00000(0000)
> > knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00000000005d84c8 CR3: 0000000072c9f000 CR4: 00000000003506f0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > ----------------
> > Code disassembly (best guess):
> >    0: df 41 54                filds  0x54(%rcx)
> >    3: 55                      push   %rbp
> >    4: 53                      push   %rbx
> >    5: 48 89 fb                mov    %rdi,%rbx
> >    8: 48 83 ec 08             sub    $0x8,%rsp
> >    c: eb 08                   jmp    0x16
> >    e: 40 84 ed                test   %bpl,%bpl
> >   11: 74 5d                   je     0x70
> >   13: 4c 89 e6                mov    %r12,%rsi
> >   16: 48 89 df                mov    %rbx,%rdi
> >   19: 48 83 c3 01             add    $0x1,%rbx
> >   1d: 48 89 f8                mov    %rdi,%rax
> >   20: 48 89 fa                mov    %rdi,%rdx
> >   23: 48 c1 e8 03             shr    $0x3,%rax
> >   27: 83 e2 07                and    $0x7,%edx
> > * 2a: 42 0f b6 04 28          movzbl (%rax,%r13,1),%eax <-- trapping
> > instruction
> >   2f: 38 d0                   cmp    %dl,%al
> >   31: 7f 04                   jg     0x37
> >   33: 84 c0                   test   %al,%al
> >   35: 75 50                   jne    0x87
> >   37: 0f b6 6b ff             movzbl -0x1(%rbx),%ebp
> >   3b: 4c 8d 66 01             lea    0x1(%rsi),%r12
> >   3f: 48                      rex.W
> >
> >
> > ---
> > 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.
> > syzbot can test patches for this issue, for details see:
> > https://goo.gl/tpsmEJ#testing-patches
> >
>
> --
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^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2022-12-01 13:28 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2022-10-24  9:56 [syzbot] general protection fault in exfat_fill_super syzbot
     [not found] ` <CAKYAXd_sNEM1KE=Tom-htUsvw5h-iF+M+arzjP7uPYLEcJQ+tw@mail.gmail.com>
2022-12-01 13:27   ` Dmitry Vyukov

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