Date: Wed, 24 Apr 2024 19:38:35 +0800
From: Sam Sun <samsun1006219@...il.com>
To: linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org, djwong@...nel.org, 
	chandan.babu@...cle.com
Cc: syzkaller-bugs@...glegroups.com, xrivendell7@...il.com
Subject: [Linux kernel bug] KASAN: slab-out-of-bounds Read in xlog_cksum

Dear developers and maintainers,

We encountered a slab-out-of-bounds bug while using our modified
syzkaller. It was tested against the latest upstream kernel (6.9-rc5).
The kernel was compiled by clang 14.0.0, and kernel config and C repro
are attached to this email. Kernel crash log is listed below.
==================================================================
BUG: KASAN: slab-out-of-bounds in crc32c_intel_le_hw
arch/x86/crypto/crc32c-intel_glue.c:67 [inline]
BUG: KASAN: slab-out-of-bounds in crc32c_pcl_intel_update+0x129/0x280
arch/x86/crypto/crc32c-intel_glue.c:165
Read of size 8 at addr ffff88801ab45200 by task syz-executor207/8113

CPU: 0 PID: 8113 Comm: syz-executor207 Not tainted 6.9.0-rc5 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114
 print_address_description+0x7b/0x360 mm/kasan/report.c:377
 print_report+0xfd/0x1e0 mm/kasan/report.c:488
 kasan_report+0xce/0x100 mm/kasan/report.c:601
 crc32c_intel_le_hw arch/x86/crypto/crc32c-intel_glue.c:67 [inline]
 crc32c_pcl_intel_update+0x129/0x280 arch/x86/crypto/crc32c-intel_glue.c:165
 crc32c+0xdf/0x1b0 lib/libcrc32c.c:47
 xlog_cksum+0xe9/0x150 fs/xfs/xfs_log.c:1829
 xlog_recover_process+0x81/0x2e0 fs/xfs/xfs_log_recover.c:2864
 xlog_do_recovery_pass+0x97e/0xfa0 fs/xfs/xfs_log_recover.c:3192
 xlog_verify_tail+0x236/0x530 fs/xfs/xfs_log_recover.c:972
 xlog_verify_head+0x275/0x530 fs/xfs/xfs_log_recover.c:1104
 xlog_find_tail+0x92f/0xeb0 fs/xfs/xfs_log_recover.c:1319
 xlog_recover+0x9f/0x540 fs/xfs/xfs_log_recover.c:3384
 xfs_log_mount+0x27f/0x420 fs/xfs/xfs_log.c:718
 xfs_mountfs+0xd15/0x1fb0 fs/xfs/xfs_mount.c:823
 xfs_fs_fill_super+0x112e/0x13a0 fs/xfs/xfs_super.c:1730
 get_tree_bdev+0x403/0x550 fs/super.c:1614
 vfs_get_tree+0x90/0x2a0 fs/super.c:1779
 do_new_mount+0x2bb/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2c9/0x3b0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x67/0x6f
RIP: 0033:0x7f2eda11946e
Code: 48 c7 c0 ff ff ff ff eb aa e8 de 07 00 00 66 2e 0f 1f 84 00 00
00 00 00 0f 1f 40 00 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4e98faa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000555588012378 RCX: 00007f2eda11946e
RDX: 0000000020009600 RSI: 0000000020009640 RDI: 00007ffc4e98fac0
RBP: 00007ffc4e98fac0 R08: 00007ffc4e98fb00 R09: 00007ffc4e98fbff
R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000010012
R13: 00007ffc4e98fb00 R14: 0000000000000003 R15: 0000000000000000
 </TASK>

Allocated by task 8113:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x30/0x70 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3966 [inline]
 __kmalloc_node+0x259/0x4f0 mm/slub.c:3973
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0x72/0x180 mm/util.c:634
 xlog_do_recovery_pass+0x16e/0xfa0
 xlog_verify_tail+0x236/0x530 fs/xfs/xfs_log_recover.c:972
 xlog_verify_head+0x275/0x530 fs/xfs/xfs_log_recover.c:1104
 xlog_find_tail+0x92f/0xeb0 fs/xfs/xfs_log_recover.c:1319
 xlog_recover+0x9f/0x540 fs/xfs/xfs_log_recover.c:3384
 xfs_log_mount+0x27f/0x420 fs/xfs/xfs_log.c:718
 xfs_mountfs+0xd15/0x1fb0 fs/xfs/xfs_mount.c:823
 xfs_fs_fill_super+0x112e/0x13a0 fs/xfs/xfs_super.c:1730
 get_tree_bdev+0x403/0x550 fs/super.c:1614
 vfs_get_tree+0x90/0x2a0 fs/super.c:1779
 do_new_mount+0x2bb/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2c9/0x3b0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x67/0x6f

The buggy address belongs to the object at ffff88801ab45000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes to the right of
 allocated 512-byte region [ffff88801ab45000, ffff88801ab45200)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ab44
head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000840 ffff888013441c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
head: 00fff80000000840 ffff888013441c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
head: 00fff80000000002 ffffea00006ad101 dead000000000122 00000000ffffffff
head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask
0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC),
pid 6481, tgid -1335316228 (systemd-udevd), ts 6481, free_ts
47750697502
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0x7d2/0x850 mm/page_alloc.c:3317
 __alloc_pages+0x25e/0x580 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x6b/0x1a0 mm/slub.c:2175
 allocate_slab+0x5d/0x200 mm/slub.c:2338
 new_slab mm/slub.c:2391 [inline]
 ___slab_alloc+0xa50/0xe90 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc_node+0x2dd/0x4f0 mm/slub.c:3973
 kmalloc_array_node include/linux/slab.h:726 [inline]
 kcalloc_node include/linux/slab.h:731 [inline]
 memcg_alloc_slab_cgroups+0x80/0x120 mm/memcontrol.c:3015
 account_slab mm/slub.c:2301 [inline]
 allocate_slab+0x99/0x200 mm/slub.c:2356
 new_slab mm/slub.c:2391 [inline]
 ___slab_alloc+0xa50/0xe90 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc+0x24c/0x350 mm/slub.c:3852
 anon_vma_chain_alloc mm/rmap.c:142 [inline]
 anon_vma_fork+0x1e7/0x4d0 mm/rmap.c:365
 dup_mmap+0xc26/0x1a40 kernel/fork.c:714
 dup_mm kernel/fork.c:1688 [inline]
 copy_mm+0x143/0x430 kernel/fork.c:1737
 copy_process+0x1810/0x3d70 kernel/fork.c:2390
 kernel_clone+0x228/0x6b0 kernel/fork.c:2797
page last free pid 5975 tgid 5975 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x72f/0x7c0 mm/page_alloc.c:2347
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
 discard_slab mm/slub.c:2437 [inline]
 __put_partials+0x1a3/0x1e0 mm/slub.c:2906
 put_cpu_partial+0x16a/0x240 mm/slub.c:2981
 __slab_free+0x2ba/0x3d0 mm/slub.c:4151
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x60/0xd0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmalloc_trace+0x16d/0x360 mm/slub.c:3992
 kmalloc include/linux/slab.h:628 [inline]
 kzalloc include/linux/slab.h:749 [inline]
 kernfs_fop_open+0x3da/0xd00 fs/kernfs/file.c:623
 do_dentry_open+0x8e7/0x1560 fs/open.c:955
 do_open fs/namei.c:3642 [inline]
 path_openat+0x285b/0x3200 fs/namei.c:3799
 do_filp_open+0x268/0x4f0 fs/namei.c:3826
 do_sys_openat2+0x12f/0x1c0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1432
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83

Memory state around the buggy address:
 ffff88801ab45100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801ab45180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801ab45200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801ab45280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801ab45300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
If you have any questions, please contact us.

Reported by Yue Sun <samsun1006219@...il.com>
Reported by xingwei lee <xrivendell7@...il.com>

Best Regards,
Yue

Download attachment "config" of type "application/octet-stream" (247888 bytes)

View attachment "xlog_cksum.c" of type "text/x-csrc" (188436 bytes)

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