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Message-ID: <202404252107.3c18eed2-lkp@intel.com>
Date: Thu, 25 Apr 2024 21:50:03 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Stas Sergeev <stsp2@...dex.ru>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Stefan Metzmacher
	<metze@...ba.org>, Eric Biederman <ebiederm@...ssion.com>, Alexander Viro
	<viro@...iv.linux.org.uk>, Andy Lutomirski <luto@...nel.org>, "Christian
 Brauner" <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Jeff Layton
	<jlayton@...nel.org>, Chuck Lever <chuck.lever@...cle.com>, Alexander Aring
	<alex.aring@...il.com>, Paolo Bonzini <pbonzini@...hat.com>, Christian
 Göttsche <cgzones@...glemail.com>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Stas Sergeev
	<stsp2@...dex.ru>, David Laight <David.Laight@...lab.com>,
	<linux-api@...r.kernel.org>, <oliver.sang@...el.com>
Subject: Re: [PATCH 2/2] openat2: add OA2_INHERIT_CRED flag



Hello,

kernel test robot noticed "BUG:KASAN:wild-memory-access_in_terminate_walk" on:

commit: 97bb54b42b1d6150e9ae11a7bf7833ed9f8c471d ("[PATCH 2/2] openat2: add OA2_INHERIT_CRED flag")
url: https://github.com/intel-lab-lkp/linux/commits/Stas-Sergeev/fs-reorganize-path_openat/20240424-185527
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 9d1ddab261f3e2af7c384dc02238784ce0cf9f98
patch link: https://lore.kernel.org/all/20240424105248.189032-3-stsp2@yandex.ru/
patch subject: [PATCH 2/2] openat2: add OA2_INHERIT_CRED flag

in testcase: boot

compiler: clang-17
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+---------------------------------------------------------------------------------------+------------+------------+
|                                                                                       | 831d3c6cc6 | 97bb54b42b |
+---------------------------------------------------------------------------------------+------------+------------+
| BUG:KASAN:wild-memory-access_in_terminate_walk                                        | 0          | 12         |
| canonical_address#:#[##]                                                              | 0          | 12         |
| RIP:terminate_walk                                                                    | 0          | 12         |
| Kernel_panic-not_syncing:Fatal_exception                                              | 0          | 12         |
+---------------------------------------------------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202404252107.3c18eed2-lkp@intel.com


[ 2.555857][ T16] BUG: KASAN: wild-memory-access in terminate_walk (include/linux/instrumented.h:? include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[    2.556181][   T16] Write of size 4 at addr aaaaaaaaaaaaaaaa by task kdevtmpfs/16
[    2.556181][   T16]
[    2.556181][   T16] CPU: 0 PID: 16 Comm: kdevtmpfs Tainted: G                T  6.9.0-rc5-00038-g97bb54b42b1d #1 c90cc2d91176f38ca16e85ead0a72934082854cd
[    2.556181][   T16] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[    2.556181][   T16] Call Trace:
[    2.556181][   T16]  <TASK>
[ 2.556181][ T16] dump_stack_lvl (lib/dump_stack.c:116) 
[ 2.556181][ T16] print_report (mm/kasan/report.c:?) 
[ 2.556181][ T16] ? kasan_report (mm/kasan/report.c:214 mm/kasan/report.c:590) 
[ 2.556181][ T16] ? terminate_walk (include/linux/instrumented.h:? include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.556181][ T16] kasan_report (mm/kasan/report.c:603) 
[ 2.556181][ T16] ? terminate_walk (include/linux/instrumented.h:? include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.556181][ T16] kasan_check_range (mm/kasan/generic.c:?) 
[ 2.556181][ T16] terminate_walk (include/linux/instrumented.h:? include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.556181][ T16] path_lookupat (fs/namei.c:2515) 
[ 2.556181][ T16] filename_lookup (fs/namei.c:2526) 
[ 2.556181][ T16] kern_path (fs/namei.c:2634) 
[ 2.556181][ T16] init_mount (fs/init.c:22) 
[ 2.556181][ T16] devtmpfs_setup (drivers/base/devtmpfs.c:419) 
[ 2.556181][ T16] devtmpfsd (drivers/base/devtmpfs.c:436) 
[ 2.556181][ T16] kthread (kernel/kthread.c:390) 
[ 2.556181][ T16] ? vclkdev_alloc (drivers/base/devtmpfs.c:435) 
[ 2.556181][ T16] ? kthread_unuse_mm (kernel/kthread.c:341) 
[ 2.556181][ T16] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 2.556181][ T16] ? kthread_unuse_mm (kernel/kthread.c:341) 
[ 2.556181][ T16] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) 
[    2.556181][   T16]  </TASK>
[    2.556181][   T16] ==================================================================
[    2.556184][   T16] Disabling lock debugging due to kernel taint
[    2.556901][   T16] general protection fault, probably for non-canonical address 0xaaaaaaaaaaaaaaaa: 0000 [#1] KASAN PTI
[    2.558131][   T16] CPU: 0 PID: 16 Comm: kdevtmpfs Tainted: G    B           T  6.9.0-rc5-00038-g97bb54b42b1d #1 c90cc2d91176f38ca16e85ead0a72934082854cd
[    2.559653][   T16] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 2.560181][ T16] RIP: 0010:terminate_walk (arch/x86/include/asm/atomic.h:103 include/linux/atomic/atomic-arch-fallback.h:949 include/linux/atomic/atomic-instrumented.h:401 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.560181][ T16] Code: 03 43 80 3c 2e 00 74 08 4c 89 ff e8 01 61 f4 ff 49 8b 1f 48 85 db 74 41 48 89 df be 04 00 00 00 e8 dc 61 f4 ff b8 ff ff ff ff <0f> c1 03 83 f8 01 75 25 43 80 3c 2e 00 74 08 4c 89 ff e8 d0 60 f4
All code
========
   0:	03 43 80             	add    -0x80(%rbx),%eax
   3:	3c 2e                	cmp    $0x2e,%al
   5:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   9:	89 ff                	mov    %edi,%edi
   b:	e8 01 61 f4 ff       	call   0xfffffffffff46111
  10:	49 8b 1f             	mov    (%r15),%rbx
  13:	48 85 db             	test   %rbx,%rbx
  16:	74 41                	je     0x59
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 dc 61 f4 ff       	call   0xfffffffffff46201
  25:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
  2a:*	0f c1 03             	xadd   %eax,(%rbx)		<-- trapping instruction
  2d:	83 f8 01             	cmp    $0x1,%eax
  30:	75 25                	jne    0x57
  32:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
  37:	74 08                	je     0x41
  39:	4c 89 ff             	mov    %r15,%rdi
  3c:	e8                   	.byte 0xe8
  3d:	d0 60 f4             	shlb   -0xc(%rax)

Code starting with the faulting instruction
===========================================
   0:	0f c1 03             	xadd   %eax,(%rbx)
   3:	83 f8 01             	cmp    $0x1,%eax
   6:	75 25                	jne    0x2d
   8:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
   d:	74 08                	je     0x17
   f:	4c 89 ff             	mov    %r15,%rdi
  12:	e8                   	.byte 0xe8
  13:	d0 60 f4             	shlb   -0xc(%rax)
[    2.560181][   T16] RSP: 0000:ffffc9000010fc40 EFLAGS: 00010246
[    2.560181][   T16] RAX: 00000000ffffffff RBX: aaaaaaaaaaaaaaaa RCX: ffffffff811e4a0f
[    2.560181][   T16] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8792adc0
[    2.560181][   T16] RBP: 0000000000000011 R08: ffffffff8792adc7 R09: 1ffffffff0f255b8
[    2.560181][   T16] R10: dffffc0000000000 R11: fffffbfff0f255b9 R12: 1ffff92000021fc4
[    2.560181][   T16] R13: dffffc0000000000 R14: 1ffff92000021fc1 R15: ffffc9000010fe08
[    2.560181][   T16] FS:  0000000000000000(0000) GS:ffffffff878dc000(0000) knlGS:0000000000000000
[    2.560181][   T16] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.560181][   T16] CR2: ffff88843ffff000 CR3: 000000000789c000 CR4: 00000000000406f0
[    2.560181][   T16] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.560181][   T16] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    2.560181][   T16] Call Trace:
[    2.560181][   T16]  <TASK>
[ 2.560181][ T16] ? __die_body (arch/x86/kernel/dumpstack.c:421) 
[ 2.560181][ T16] ? die_addr (arch/x86/kernel/dumpstack.c:?) 
[ 2.560181][ T16] ? exc_general_protection (arch/x86/kernel/traps.c:?) 
[ 2.560181][ T16] ? end_report (arch/x86/include/asm/current.h:49 mm/kasan/report.c:240) 
[ 2.560181][ T16] ? asm_exc_general_protection (arch/x86/include/asm/idtentry.h:617) 
[ 2.560181][ T16] ? add_taint (arch/x86/include/asm/bitops.h:60 include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) 
[ 2.560181][ T16] ? terminate_walk (arch/x86/include/asm/atomic.h:103 include/linux/atomic/atomic-arch-fallback.h:949 include/linux/atomic/atomic-instrumented.h:401 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.560181][ T16] path_lookupat (fs/namei.c:2515) 
[ 2.560181][ T16] filename_lookup (fs/namei.c:2526) 
[ 2.560181][ T16] kern_path (fs/namei.c:2634) 
[ 2.560181][ T16] init_mount (fs/init.c:22) 
[ 2.560181][ T16] devtmpfs_setup (drivers/base/devtmpfs.c:419) 
[ 2.560181][ T16] devtmpfsd (drivers/base/devtmpfs.c:436) 
[ 2.560181][ T16] kthread (kernel/kthread.c:390) 
[ 2.560181][ T16] ? vclkdev_alloc (drivers/base/devtmpfs.c:435) 
[ 2.560181][ T16] ? kthread_unuse_mm (kernel/kthread.c:341) 
[ 2.560181][ T16] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 2.560181][ T16] ? kthread_unuse_mm (kernel/kthread.c:341) 
[ 2.560181][ T16] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) 
[    2.560181][   T16]  </TASK>
[    2.560181][   T16] Modules linked in:
[    2.560183][   T16] ---[ end trace 0000000000000000 ]---
[ 2.560820][ T16] RIP: 0010:terminate_walk (arch/x86/include/asm/atomic.h:103 include/linux/atomic/atomic-arch-fallback.h:949 include/linux/atomic/atomic-instrumented.h:401 include/linux/refcount.h:264 include/linux/refcount.h:307 include/linux/refcount.h:325 fs/namei.c:702) 
[ 2.561462][ T16] Code: 03 43 80 3c 2e 00 74 08 4c 89 ff e8 01 61 f4 ff 49 8b 1f 48 85 db 74 41 48 89 df be 04 00 00 00 e8 dc 61 f4 ff b8 ff ff ff ff <0f> c1 03 83 f8 01 75 25 43 80 3c 2e 00 74 08 4c 89 ff e8 d0 60 f4
All code
========
   0:	03 43 80             	add    -0x80(%rbx),%eax
   3:	3c 2e                	cmp    $0x2e,%al
   5:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   9:	89 ff                	mov    %edi,%edi
   b:	e8 01 61 f4 ff       	call   0xfffffffffff46111
  10:	49 8b 1f             	mov    (%r15),%rbx
  13:	48 85 db             	test   %rbx,%rbx
  16:	74 41                	je     0x59
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 dc 61 f4 ff       	call   0xfffffffffff46201
  25:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
  2a:*	0f c1 03             	xadd   %eax,(%rbx)		<-- trapping instruction
  2d:	83 f8 01             	cmp    $0x1,%eax
  30:	75 25                	jne    0x57
  32:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
  37:	74 08                	je     0x41
  39:	4c 89 ff             	mov    %r15,%rdi
  3c:	e8                   	.byte 0xe8
  3d:	d0 60 f4             	shlb   -0xc(%rax)

Code starting with the faulting instruction
===========================================
   0:	0f c1 03             	xadd   %eax,(%rbx)
   3:	83 f8 01             	cmp    $0x1,%eax
   6:	75 25                	jne    0x2d
   8:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
   d:	74 08                	je     0x17
   f:	4c 89 ff             	mov    %r15,%rdi
  12:	e8                   	.byte 0xe8
  13:	d0 60 f4             	shlb   -0xc(%rax)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240425/202404252107.3c18eed2-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki


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