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KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key

Status: upstream: reported C repro on 2024/02/03 08:40
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+57028366b9825d8e8ad0@syzkaller.appspotmail.com
First crash: 246d, last: 13d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: slab-out-of-bounds Write in hfsplus_bnode_read (log)
Repro: C syz .config
  
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH next] hfsplus: fix oob in hfsplus_bnode_read_key 3 (3) 2024/02/07 06:23
[syzbot] [hfs?] KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key 1 (3) 2024/02/04 11:42
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key origin:upstream C error 10 125d 249d 0/3 upstream: reported C repro on 2024/01/30 17:02
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2024/09/18 19:45 20m retest repro linux-next report log
2024/07/10 13:58 20m retest repro linux-next report log
2024/04/27 18:03 18m retest repro linux-next report log
2024/02/17 02:50 22m retest repro linux-next error
2024/02/04 11:04 24m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master OK log

Sample crash report:
loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline]
BUG: KASAN: slab-out-of-bounds in hfsplus_bnode_read fs/hfsplus/bnode.c:32 [inline]
BUG: KASAN: slab-out-of-bounds in hfsplus_bnode_read_key+0x394/0x610 fs/hfsplus/bnode.c:70
Write of size 4026 at addr ffff888011f0d000 by task syz-executor616/5099

CPU: 0 UID: 0 PID: 5099 Comm: syz-executor616 Not tainted 6.11.0-syzkaller-08829-gaf9c191ac2a0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 memcpy_from_page include/linux/highmem.h:423 [inline]
 hfsplus_bnode_read fs/hfsplus/bnode.c:32 [inline]
 hfsplus_bnode_read_key+0x394/0x610 fs/hfsplus/bnode.c:70
 hfsplus_brec_insert+0x6ea/0xde0 fs/hfsplus/brec.c:141
 hfsplus_create_attr+0x4a2/0x640 fs/hfsplus/attributes.c:252
 __hfsplus_setxattr+0x6fe/0x22d0 fs/hfsplus/xattr.c:354
 hfsplus_setxattr+0xb0/0xe0 fs/hfsplus/xattr.c:432
 hfsplus_user_setxattr+0x40/0x60 fs/hfsplus/xattr_user.c:30
 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234
 vfs_setxattr+0x221/0x430 fs/xattr.c:321
 do_setxattr fs/xattr.c:629 [inline]
 path_setxattr+0x37e/0x4d0 fs/xattr.c:658
 __do_sys_setxattr fs/xattr.c:676 [inline]
 __se_sys_setxattr fs/xattr.c:672 [inline]
 __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:672
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9a4cb5cad9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff631e9e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9a4cb5cad9
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000020000080
RBP: 00007f9a4cbd05f0 R08: 0000000000000001 R09: 00005555773a14c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff631e9e40
R13: 00007fff631ea068 R14: 431bde82d7b634db R15: 00007f9a4cba503b
 </TASK>

Allocated by task 5099:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4265 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4277
 kmalloc_noprof include/linux/slab.h:882 [inline]
 hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
 hfsplus_create_attr+0x161/0x640 fs/hfsplus/attributes.c:216
 __hfsplus_setxattr+0x6fe/0x22d0 fs/hfsplus/xattr.c:354
 hfsplus_setxattr+0xb0/0xe0 fs/hfsplus/xattr.c:432
 hfsplus_user_setxattr+0x40/0x60 fs/hfsplus/xattr_user.c:30
 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234
 vfs_setxattr+0x221/0x430 fs/xattr.c:321
 do_setxattr fs/xattr.c:629 [inline]
 path_setxattr+0x37e/0x4d0 fs/xattr.c:658
 __do_sys_setxattr fs/xattr.c:676 [inline]
 __se_sys_setxattr fs/xattr.c:672 [inline]
 __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:672
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888011f0d000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes inside of
 allocated 536-byte region [ffff888011f0d000, ffff888011f0d218)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f0c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ac41dc0 ffffea0000480700 dead000000000003
raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ac41dc0 ffffea0000480700 dead000000000003
head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000002 ffffea000047c301 ffffffffffffffff 0000000000000000
head: ffff888000000004 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4806, tgid 4806 (rcS), ts 50650396795, free_ts 47648184661
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x120 mm/slub.c:2413
 allocate_slab+0x5a/0x2f0 mm/slub.c:2579
 new_slab mm/slub.c:2632 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819
 __slab_alloc+0x58/0xa0 mm/slub.c:3909
 __slab_alloc_node mm/slub.c:3962 [inline]
 slab_alloc_node mm/slub.c:4123 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x25a/0x400 mm/slub.c:4277
 kmalloc_noprof include/linux/slab.h:882 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 tomoyo_init_log+0x1b3d/0x2050 security/tomoyo/audit.c:275
 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089
 tomoyo_find_next_domain+0x403/0x1cf0 security/tomoyo/domain.c:752
 tomoyo_bprm_check_security+0x114/0x180 security/tomoyo/tomoyo.c:102
 security_bprm_check+0x86/0x250 security/security.c:1296
 search_binary_handler fs/exec.c:1740 [inline]
 exec_binprm fs/exec.c:1794 [inline]
 bprm_execve+0xa56/0x1770 fs/exec.c:1845
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1952
page last free pid 4598 tgid 4598 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638
 __slab_free+0x31b/0x3d0 mm/slub.c:4491
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:247 [inline]
 slab_post_alloc_hook mm/slub.c:4086 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4154
 shmem_alloc_inode+0x28/0x40 mm/shmem.c:4769
 alloc_inode fs/inode.c:263 [inline]
 new_inode_pseudo fs/inode.c:1110 [inline]
 new_inode+0x6e/0x310 fs/inode.c:1129
 __shmem_get_inode mm/shmem.c:2806 [inline]
 shmem_get_inode+0x34a/0xd70 mm/shmem.c:2877
 shmem_mknod+0x5f/0x1e0 mm/shmem.c:3573
 lookup_open fs/namei.c:3595 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0x1c03/0x3590 fs/namei.c:3930
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888011f0d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888011f0d180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888011f0d200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888011f0d280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888011f0d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/23 05:40 upstream af9c191ac2a0 6f888b75 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/02/03 00:56 linux-next 076d56d74f17 60bf9982 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/06/24 16:38 upstream f2661062f16b edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/04/09 23:17 upstream fe46a7dd189e 171ec371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/03/24 18:24 upstream fe46a7dd189e 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/04/11 03:33 linux-next 6ebf211bb11d 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/02/03 00:35 linux-next 076d56d74f17 60bf9982 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
* Struck through repros no longer work on HEAD.