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

Status: auto-obsoleted due to no activity on 2025/07/15 10:00
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+57028366b9825d8e8ad0@syzkaller.appspotmail.com
First crash: 920d, last: 553d
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
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ 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 Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key 21 syz, C error 11 631d 923d 0/3 auto-obsoleted due to no activity on 2025/06/14 02:52
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2025/07/15 09:34 25m retest repro linux-next OK log
2025/05/15 13:27 25m retest repro upstream OK log
2025/05/06 07:29 39m retest repro linux-next error
2025/05/05 16:01 20m retest repro upstream OK log
2025/02/24 17:35 11m retest repro linux-next error
2025/02/24 15:34 19m retest repro upstream report log
2025/02/18 13:04 1h04m retest repro upstream report log
2024/12/16 14:55 13m retest repro upstream report log
2024/12/16 14:51 12m retest repro linux-next error
2024/11/24 18:25 23m retest repro upstream report log
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:
loop4: 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 2838 at addr ffff888058ac0800 by task syz.4.493/10976

CPU: 0 UID: 0 PID: 10976 Comm: syz.4.493 Not tainted 6.13.0-rc7-syzkaller-00191-gfda5e3f28400 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 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_initxattrs+0x158/0x220 fs/hfsplus/xattr_security.c:59
 security_inode_init_security+0x29c/0x480 security/security.c:1847
 hfsplus_fill_super+0x143a/0x1be0 fs/hfsplus/super.c:568
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3511
 do_mount fs/namespace.c:3851 [inline]
 __do_sys_mount fs/namespace.c:4061 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4038
 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: 0033:0x7f5c0e9874ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f5c0f7afe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5c0f7afef0 RCX: 00007f5c0e9874ca
RDX: 00000000200001c0 RSI: 0000000020000080 RDI: 00007f5c0f7afeb0
RBP: 00000000200001c0 R08: 00007f5c0f7afef0 R09: 0000000000000080
R10: 0000000000000080 R11: 0000000000000246 R12: 0000000020000080
R13: 00007f5c0f7afeb0 R14: 00000000000006ab R15: 0000000020000000
 </TASK>

Allocated by task 10976:
 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:260 [inline]
 __do_kmalloc_node mm/slub.c:4298 [inline]
 __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4310
 kmalloc_noprof include/linux/slab.h:905 [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_initxattrs+0x158/0x220 fs/hfsplus/xattr_security.c:59
 security_inode_init_security+0x29c/0x480 security/security.c:1847
 hfsplus_fill_super+0x143a/0x1be0 fs/hfsplus/super.c:568
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3511
 do_mount fs/namespace.c:3851 [inline]
 __do_sys_mount fs/namespace.c:4061 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4038
 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 ffff888058ac0800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes inside of
 allocated 536-byte region [ffff888058ac0800, ffff888058ac0a18)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58ac0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ac41dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea000162b001 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 8984, tgid 8984 (syz-executor), ts 248483551060, free_ts 248438982706
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558
 prep_new_page mm/page_alloc.c:1566 [inline]
 get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753
 alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269
 alloc_slab_page+0x6a/0x110 mm/slub.c:2423
 allocate_slab+0x5a/0x2b0 mm/slub.c:2589
 new_slab mm/slub.c:2642 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830
 __slab_alloc+0x58/0xa0 mm/slub.c:3920
 __slab_alloc_node mm/slub.c:3995 [inline]
 slab_alloc_node mm/slub.c:4156 [inline]
 __do_kmalloc_node mm/slub.c:4297 [inline]
 __kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4310
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 ieee802_11_parse_elems_full+0xdb/0x2880 net/mac80211/parse.c:958
 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2384 [inline]
 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2391 [inline]
 ieee80211_inform_bss+0x15f/0x1080 net/mac80211/scan.c:79
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0xec1/0x2070 net/wireless/scan.c:2334
 cfg80211_inform_bss_data+0x3ce/0x5e80 net/wireless/scan.c:3189
 cfg80211_inform_bss_frame_data+0x3bb/0x720 net/wireless/scan.c:3284
 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x526/0x9c0 net/mac80211/scan.c:340
page last free pid 5193 tgid 5193 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xd2c/0x1000 mm/page_alloc.c:2659
 discard_slab mm/slub.c:2688 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3157
 put_cpu_partial+0x17c/0x250 mm/slub.c:3232
 __slab_free+0x290/0x380 mm/slub.c:4483
 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:250 [inline]
 slab_post_alloc_hook mm/slub.c:4119 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
 getname_flags+0xb7/0x540 fs/namei.c:139
 do_readlinkat+0xd8/0x3a0 fs/stat.c:561
 __do_sys_readlink fs/stat.c:599 [inline]
 __se_sys_readlink fs/stat.c:596 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:596
 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:
 ffff888058ac0900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888058ac0980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888058ac0a00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff888058ac0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888058ac0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/19 08:19 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/11/10 18:23 upstream de2f378f2b77 6b856513 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-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
2025/02/04 03:03 upstream 0de63bb7d919 8f267cef .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2025/01/02 23:42 upstream 0bc21e701a6f d3ccff63 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
2024/10/21 16:54 upstream 42f7652d3eb5 14517542 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
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
2024/04/11 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 00:56 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
2024/02/03 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
2024/12/02 14:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7b1d1d4cfac0 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key
* Struck through repros no longer work on HEAD.