linux-kernel - [syzbot] general protection fault in sync_file

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Message-ID: <0000000000007692c305cc2c1df8@google.com>
Date:   Fri, 17 Sep 2021 00:45:28 -0700
From:   syzbot <syzbot+0d2a4f11e03455f608de@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] general protection fault in sync_file_range

Hello,

syzbot found the following issue on:

HEAD commit:    0319b848b155 binfmt: a.out: Fix bogus semicolon
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=163986cd300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=faed7df0f442c217
dashboard link: https://syzkaller.appspot.com/bug?extid=0d2a4f11e03455f608de
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1

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+0d2a4f11e03455f608de@...kaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 12026 Comm: iou-wrk-12025 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:file_inode include/linux/fs.h:1350 [inline]
RIP: 0010:sync_file_range+0xc3/0x290 fs/sync.c:283
Code: 7f e8 c1 47 9f ff 4d 85 ed 0f 85 7f 01 00 00 e8 53 42 9f ff 49 8d 7c 24 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b7 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0000:ffffc9000256fb20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff81d6deed RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81e357a8
R10: ffffffff81d6dedf R11: 0000000000000008 R12: 0000000000000000
R13: 0000000000000000 R14: 7fffffffffffffff R15: 0000000000000000
FS:  00007f3dda997700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c02aa00000 CR3: 000000002522f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 io_sync_file_range fs/io_uring.c:4603 [inline]
 io_issue_sqe+0xdc5/0x6ba0 fs/io_uring.c:6575
 io_wq_submit_work+0x1d4/0x300 fs/io_uring.c:6707
 io_worker_handle_work+0xcb1/0x1950 fs/io-wq.c:560
 io_wqe_worker+0x2cc/0xbb0 fs/io-wq.c:609
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace d1a0c5dc7ddb668f ]---
RIP: 0010:file_inode include/linux/fs.h:1350 [inline]
RIP: 0010:sync_file_range+0xc3/0x290 fs/sync.c:283
Code: 7f e8 c1 47 9f ff 4d 85 ed 0f 85 7f 01 00 00 e8 53 42 9f ff 49 8d 7c 24 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b7 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0000:ffffc9000256fb20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff81d6deed RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81e357a8
R10: ffffffff81d6dedf R11: 0000000000000008 R12: 0000000000000000
R13: 0000000000000000 R14: 7fffffffffffffff R15: 0000000000000000
FS:  00007f3dda997700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000206d6100 CR3: 000000002522f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	7f e8                	jg     0xffffffea
   2:	c1 47 9f ff          	roll   $0xff,-0x61(%rdi)
   6:	4d 85 ed             	test   %r13,%r13
   9:	0f 85 7f 01 00 00    	jne    0x18e
   f:	e8 53 42 9f ff       	callq  0xff9f4267
  14:	49 8d 7c 24 20       	lea    0x20(%r12),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 b7 01 00 00    	jne    0x1eb
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	4d                   	rex.WRB
  3f:	8b                   	.byte 0x8b


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