WARNING in current_check_refer_path

[Mickaël Salaün]

Hello,

Thanks for the report.  Could you please provide a reproducer?

Regards,
 Mickaël


On Sun, Apr 28, 2024 at 10:47:02AM +0800, Ubisectech Sirius wrote:
> Hello.
> We are Ubisectech Sirius Team, the vulnerability lab of China ValiantSec. Recently, our team has discovered a issue in Linux kernel 6.7. Attached to the email were a PoC file of the issue.
> 
> Stack dump:
> 
> loop3: detected capacity change from 0 to 1024
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 30368 at security/landlock/fs.c:598 get_mode_access security/landlock/fs.c:598 [inline]
> WARNING: CPU: 0 PID: 30368 at security/landlock/fs.c:598 get_mode_access security/landlock/fs.c:578 [inline]
> WARNING: CPU: 0 PID: 30368 at security/landlock/fs.c:598 current_check_refer_path+0x955/0xa60 security/landlock/fs.c:758
> Modules linked in:
> CPU: 0 PID: 30368 Comm: syz-executor.3 Not tainted 6.7.0 #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> RIP: 0010:get_mode_access security/landlock/fs.c:598 [inline]
> RIP: 0010:get_mode_access security/landlock/fs.c:578 [inline]
> RIP: 0010:current_check_refer_path+0x955/0xa60 security/landlock/fs.c:758
> Code: e9 76 fb ff ff 41 bc fe ff ff ff e9 6b fb ff ff e8 00 99 77 fd 90 0f 0b 90 41 bc f3 ff ff ff e9 57 fb ff ff e8 ec 98 77 fd 90 <0f> 0b 90 31 db e9 86 f9 ff ff bb 00 08 00 00 e9 7c f9 ff ff 41 ba
> RSP: 0018:ffffc90001fb7ba0 EFLAGS: 00010212
> RAX: 0000000000000bc5 RBX: ffff88805feeb7b0 RCX: ffffc90006e15000
> RDX: 0000000000040000 RSI: ffffffff84125d64 RDI: 0000000000000003
> RBP: ffff8880123c5608 R08: 0000000000000003 R09: 000000000000c000
> R10: 000000000000f000 R11: 0000000000000000 R12: ffff88805d32fc00
> R13: ffff8880123c5608 R14: 0000000000000000 R15: 0000000000000001
> FS:  00007fd70c4d8640(0000) GS:ffff88802c600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2c136000 CR3: 000000005b2a0000 CR4: 0000000000750ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>  <TASK>
>  security_path_rename+0x124/0x230 security/security.c:1828
>  do_renameat2+0x9f6/0xd30 fs/namei.c:4983
>  __do_sys_rename fs/namei.c:5042 [inline]
>  __se_sys_rename fs/namei.c:5040 [inline]
>  __x64_sys_rename+0x81/0xa0 fs/namei.c:5040
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0x43/0x120 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x6f/0x77
> RIP: 0033:0x7fd70b6900ed
> Code: c3 e8 97 2b 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fd70c4d8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
> RAX: ffffffffffffffda RBX: 00007fd70b7cbf80 RCX: 00007fd70b6900ed
> RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000100
> RBP: 00007fd70b6f14a6 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 000000000000000b R14: 00007fd70b7cbf80 R15: 00007fd70c4b8000
>  </TASK>
> 
> Thank you for taking the time to read this email and we look forward to working with you further.
> 
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