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KASAN: slab-out-of-bounds Read in hfsplus_bnode_read

Status: upstream: reported C repro on 2025/03/04 05:56
Reported-by: syzbot+4c6680758f5b535c27ee@syzkaller.appspotmail.com
First crash: 8d05h, last: 5d05h
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/03/04 upstream (ToT) 99fa936e8e4f C Failed due to an error; will retry later
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read origin:upstream C 50 10d 630d 0/3 upstream: reported C repro on 2023/06/20 20:03
linux-4.19 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read C error 2 836d 837d 0/1 upstream: reported C repro on 2022/11/26 10:26
linux-4.14 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read hfsplus C 3 738d 830d 0/1 upstream: reported C repro on 2022/12/03 05:45
upstream KASAN: slab-out-of-bounds Read in hfsplus_bnode_read hfs C error 119 7h56m 837d 0/28 upstream: reported C repro on 2022/11/26 08:07

Sample crash report:
loop0: detected capacity change from 0 to 1024
hfsplus: request for non-existent node 211 in B*Tree
hfsplus: request for non-existent node 211 in B*Tree
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_bnode_read+0x9c/0x270 fs/hfsplus/bnode.c:32
Read of size 8 at addr ffff0000c0c0dee0 by task syz-executor404/4297

CPU: 0 PID: 4297 Comm: syz-executor404 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 hfsplus_bnode_read+0x9c/0x270 fs/hfsplus/bnode.c:32
 hfsplus_bnode_dump+0x2ec/0x534
 hfsplus_brec_remove+0x3d0/0x4a4 fs/hfsplus/brec.c:229
 __hfsplus_delete_attr+0x1dc/0x3e4 fs/hfsplus/attributes.c:299
 hfsplus_delete_attr+0x234/0x2c8 fs/hfsplus/attributes.c:345
 __hfsplus_setxattr+0x3b8/0x1d3c fs/hfsplus/xattr.c:342
 hfsplus_setxattr+0xdc/0x12c fs/hfsplus/xattr.c:434
 hfsplus_trusted_setxattr+0x54/0x6c fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x1a8/0x344 fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x230/0x294 fs/xattr.c:617
 path_setxattr+0x17c/0x258 fs/xattr.c:636
 __do_sys_setxattr fs/xattr.c:652 [inline]
 __se_sys_setxattr fs/xattr.c:648 [inline]
 __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:648
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 4297:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xd8/0x1c4 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 __hfs_bnode_create+0xe4/0x6d4 fs/hfsplus/bnode.c:409
 hfsplus_bnode_find+0x1f8/0xc60 fs/hfsplus/bnode.c:486
 hfsplus_brec_find+0x134/0x4a0 fs/hfsplus/bfind.c:172
 hfsplus_find_attr+0x13c/0x1e0
 hfsplus_attr_exists+0x154/0x1c8 fs/hfsplus/attributes.c:182
 __hfsplus_setxattr+0x384/0x1d3c fs/hfsplus/xattr.c:336
 hfsplus_setxattr+0xdc/0x12c fs/hfsplus/xattr.c:434
 hfsplus_trusted_setxattr+0x54/0x6c fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x1a8/0x344 fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x230/0x294 fs/xattr.c:617
 path_setxattr+0x17c/0x258 fs/xattr.c:636
 __do_sys_setxattr fs/xattr.c:652 [inline]
 __se_sys_setxattr fs/xattr.c:648 [inline]
 __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:648
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000c0c0de00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 224 bytes inside of
 256-byte region [ffff0000c0c0de00, ffff0000c0c0df00)

The buggy address belongs to the physical page:
page:00000000dde6fb63 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x100c0c
head:00000000dde6fb63 order:1 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc0003030380 dead000000000002 ffff0000c0002480
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c0c0dd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c0c0de00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000c0c0de80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff0000c0c0df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c0c0df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Unable to handle kernel paging request at virtual address ffff74f000008847
KASAN: maybe wild-memory-access in range [0xffffa78000044238-0xffffa7800004423f]
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ab074000
[ffff74f000008847] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4297 Comm: syz-executor404 Tainted: G    B              6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bytes_is_nonzero mm/kasan/generic.c:85 [inline]
pc : memory_is_nonzero mm/kasan/generic.c:102 [inline]
pc : memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
pc : memory_is_poisoned mm/kasan/generic.c:159 [inline]
pc : check_region_inline mm/kasan/generic.c:180 [inline]
pc : kasan_check_range+0x64/0x2a4 mm/kasan/generic.c:189
lr : memcpy+0x48/0x90 mm/kasan/shadow.c:65
sp : ffff800021186df0
x29: ffff800021186df0 x28: 0000000000000001 x27: 0000000040000000
x26: 1ffff00002a9d86b x25: 0000000000000fff x24: 0000000000001000
x23: 0000000000000001 x22: ffff800009084cf0 x21: ffff800021186f00
x20: ffffa7800004423f x19: 0000000000000001 x18: 1fffe0003679cb76
x17: 0000000000000000 x16: ffff80001226f180 x15: 0000000000000000
x14: 00000000000000ff x13: ffff0000d9d69bc0 x12: 0000000000000001
x11: 1ffff4f000008847 x10: 1ffff4f000008847 x9 : ffffffffffffffff
x8 : ffff74f000008847 x7 : 0000000000000001 x6 : 00000000000000ff
x5 : ffff800021186f22 x4 : ffff00016b0a100c x3 : ffff800009084cf0
x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffffa7800004423f
Call trace:
 bytes_is_nonzero mm/kasan/generic.c:84 [inline]
 memory_is_nonzero mm/kasan/generic.c:102 [inline]
 memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
 memory_is_poisoned mm/kasan/generic.c:159 [inline]
 check_region_inline mm/kasan/generic.c:180 [inline]
 kasan_check_range+0x64/0x2a4 mm/kasan/generic.c:189
 memcpy+0x48/0x90 mm/kasan/shadow.c:65
 memcpy_from_page include/linux/highmem.h:393 [inline]
 hfsplus_bnode_read+0x134/0x270 fs/hfsplus/bnode.c:32
 hfsplus_bnode_dump+0x2ec/0x534
 hfsplus_brec_remove+0x3d0/0x4a4 fs/hfsplus/brec.c:229
 __hfsplus_delete_attr+0x1dc/0x3e4 fs/hfsplus/attributes.c:299
 hfsplus_delete_attr+0x234/0x2c8 fs/hfsplus/attributes.c:345
 __hfsplus_setxattr+0x3b8/0x1d3c fs/hfsplus/xattr.c:342
 hfsplus_setxattr+0xdc/0x12c fs/hfsplus/xattr.c:434
 hfsplus_trusted_setxattr+0x54/0x6c fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x1a8/0x344 fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x230/0x294 fs/xattr.c:617
 path_setxattr+0x17c/0x258 fs/xattr.c:636
 __do_sys_setxattr fs/xattr.c:652 [inline]
 __se_sys_setxattr fs/xattr.c:648 [inline]
 __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:648
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 5400014c b4000b8c aa2a03e9 8b0b0129 (3940010a) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	5400014c 	b.gt	0x28
   4:	b4000b8c 	cbz	x12, 0x174
   8:	aa2a03e9 	mvn	x9, x10
   c:	8b0b0129 	add	x9, x9, x11
* 10:	3940010a 	ldrb	w10, [x8] <-- trapping instruction

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/04 10:20 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
2025/03/04 09:17 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
2025/03/04 08:05 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
2025/03/04 07:02 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
2025/03/07 06:26 linux-6.1.y 3a8358583626 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
2025/03/04 05:55 linux-6.1.y 3a8358583626 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in hfsplus_bnode_read
* Struck through repros no longer work on HEAD.