linux-kernel - Re: [syzbot] [tomoyo?] general protection fault in tomoyo_gc

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Message-ID: <67656003.050a0220.1333dc.00dc.GAE@google.com>
Date: Fri, 20 Dec 2024 04:16:03 -0800
From: syzbot <syzbot+bf6351831bc4f9148d98@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [tomoyo?] general protection fault in tomoyo_gc_thread

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in tomoyo_init_request_info

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 UID: 0 PID: 6698 Comm: syz.2.57 Not tainted 6.13.0-rc3-syzkaller-g8faabc041a00-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:tomoyo_init_request_info+0x6f/0x370 security/tomoyo/util.c:1028
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 98 02 00 00 48 8d 7d 50 48 89 6b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 5d 02 00 00 48 8d 7b 4b 44 0f b6 6d
RSP: 0018:ffffc90003eef790 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffc90003eef808 RCX: 0000000000000000
RDX: 000000000000000a RSI: ffffffff8452e107 RDI: 0000000000000050
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90003eef808 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000048000 R14: ffff8880760cf040 R15: 0000000000000004
FS:  00007f79ac9fe6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000001dea8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tomoyo_check_open_permission+0x27a/0x3c0 security/tomoyo/file.c:769
 tomoyo_file_open+0x6b/0x90 security/tomoyo/tomoyo.c:334
 security_file_open+0x84/0x1e0 security/security.c:3105
 do_dentry_open+0x57e/0x1ea0 fs/open.c:928
 vfs_open+0x82/0x3f0 fs/open.c:1075
 do_open fs/namei.c:3828 [inline]
 path_openat+0x1e6a/0x2d60 fs/namei.c:3987
 do_filp_open+0x20c/0x470 fs/namei.c:4014
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_openat fs/open.c:1433 [inline]
 __se_sys_openat fs/open.c:1428 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1428
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f79ad785d19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f79ac9fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f79ad975fa0 RCX: 00007f79ad785d19
RDX: 0000000000040000 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f79ad801a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f79ad975fa0 R15: 00007ffe8d39dad8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:tomoyo_init_request_info+0x6f/0x370 security/tomoyo/util.c:1028
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 98 02 00 00 48 8d 7d 50 48 89 6b 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 5d 02 00 00 48 8d 7b 4b 44 0f b6 6d
RSP: 0018:ffffc90003eef790 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffc90003eef808 RCX: 0000000000000000
RDX: 000000000000000a RSI: ffffffff8452e107 RDI: 0000000000000050
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90003eef808 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000048000 R14: ffff8880760cf040 R15: 0000000000000004
FS:  00007f79ac9fe6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c006f48000 CR3: 000000001dea8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 89 fa             	mov    %rdi,%rdx
   3:	48 c1 ea 03          	shr    $0x3,%rdx
   7:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   b:	0f 85 98 02 00 00    	jne    0x2a9
  11:	48 8d 7d 50          	lea    0x50(%rbp),%rdi
  15:	48 89 6b 10          	mov    %rbp,0x10(%rbx)
  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:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 06                	je     0x38
  32:	0f 8e 5d 02 00 00    	jle    0x295
  38:	48 8d 7b 4b          	lea    0x4b(%rbx),%rdi
  3c:	44                   	rex.R
  3d:	0f                   	.byte 0xf
  3e:	b6 6d                	mov    $0x6d,%dh


Tested on:

commit:         8faabc04 Merge tag 'net-6.13-rc4' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13f200c4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c22efbd20f8da769
dashboard link: https://syzkaller.appspot.com/bug?extid=bf6351831bc4f9148d98
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=170dcf30580000