[v6.6] general protection fault in hfs_find_init
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syzbot
Aug 1, 2025, 2:56:33 PM8/1/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13916f82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93a71d...@syzkaller.appspotmail.com
loop6: detected capacity change from 0 to 64
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 8707 Comm: syz.6.591 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc90005237388 EFLAGS: 00010202
RAX: 1ffff92000a46e8f RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001c407000 RSI: 000000000000c0f5 RDI: ffffc90005237470
RBP: 0000000000000040 R08: ffffc90005237497 R09: 0000000000000000
R10: ffffc90005237460 R11: fffff52000a46e93 R12: ffff88806abc6630
R13: dffffc0000000000 R14: ffffc90005237460 R15: 0000000000000008
FS: 00007f50ac6926c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe109c63000 CR3: 00000000696bd000 CR4: 00000000003506e0
Call Trace:
<TASK>
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_get_block+0x51c/0xbd0 fs/hfs/extent.c:366
block_read_full_folio+0x42e/0xf40 fs/buffer.c:2406
filemap_read_folio+0x167/0x760 mm/filemap.c:2420
do_read_cache_folio+0x470/0x7e0 mm/filemap.c:3789
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
hfs_btree_open+0x56c/0x10c0 fs/hfs/btree.c:78
hfs_mdb_get+0x12dc/0x2010 fs/hfs/mdb.c:199
hfs_fill_super+0xd1d/0x1320 fs/hfs/super.c:406
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f50ab79030a
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:00007f50ac691e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f50ac691ef0 RCX: 00007f50ab79030a
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 00007f50ac691eb0
RBP: 0000200000000180 R08: 00007f50ac691ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000100
R13: 00007f50ac691eb0 R14: 00000000000002d9 R15: 0000200000000240
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc90005237388 EFLAGS: 00010202
RAX: 1ffff92000a46e8f RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001c407000 RSI: 000000000000c0f5 RDI: ffffc90005237470
RBP: 0000000000000040 R08: ffffc90005237497 R09: 0000000000000000
R10: ffffc90005237460 R11: fffff52000a46e93 R12: ffff88806abc6630
R13: dffffc0000000000 R14: ffffc90005237460 R15: 0000000000000008
FS: 00007f50ac6926c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559c40822950 CR3: 00000000696bd000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: 7e 18 jle 0x1a
2: 4c 89 f8 mov %r15,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
e: 74 08 je 0x18
10: 4c 89 ff mov %r15,%rdi
13: e8 c8 7c 87 ff call 0xff877ce0
18: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
1f: 48 8d 6b 40 lea 0x40(%rbx),%rbp
23: 49 89 ef mov %rbp,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 01 01 00 00 jne 0x138
37: 8b 45 00 mov 0x0(%rbp),%eax
3a: 8d 7c 00 04 lea 0x4(%rax,%rax,1),%edi
3e: be .byte 0xbe
3f: c0 .byte 0xc0
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13916f82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93a71d...@syzkaller.appspotmail.com
loop6: detected capacity change from 0 to 64
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 8707 Comm: syz.6.591 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc90005237388 EFLAGS: 00010202
RAX: 1ffff92000a46e8f RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001c407000 RSI: 000000000000c0f5 RDI: ffffc90005237470
RBP: 0000000000000040 R08: ffffc90005237497 R09: 0000000000000000
R10: ffffc90005237460 R11: fffff52000a46e93 R12: ffff88806abc6630
R13: dffffc0000000000 R14: ffffc90005237460 R15: 0000000000000008
FS: 00007f50ac6926c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe109c63000 CR3: 00000000696bd000 CR4: 00000000003506e0
Call Trace:
<TASK>
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_get_block+0x51c/0xbd0 fs/hfs/extent.c:366
block_read_full_folio+0x42e/0xf40 fs/buffer.c:2406
filemap_read_folio+0x167/0x760 mm/filemap.c:2420
do_read_cache_folio+0x470/0x7e0 mm/filemap.c:3789
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
hfs_btree_open+0x56c/0x10c0 fs/hfs/btree.c:78
hfs_mdb_get+0x12dc/0x2010 fs/hfs/mdb.c:199
hfs_fill_super+0xd1d/0x1320 fs/hfs/super.c:406
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f50ab79030a
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:00007f50ac691e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f50ac691ef0 RCX: 00007f50ab79030a
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 00007f50ac691eb0
RBP: 0000200000000180 R08: 00007f50ac691ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000100
R13: 00007f50ac691eb0 R14: 00000000000002d9 R15: 0000200000000240
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc90005237388 EFLAGS: 00010202
RAX: 1ffff92000a46e8f RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001c407000 RSI: 000000000000c0f5 RDI: ffffc90005237470
RBP: 0000000000000040 R08: ffffc90005237497 R09: 0000000000000000
R10: ffffc90005237460 R11: fffff52000a46e93 R12: ffff88806abc6630
R13: dffffc0000000000 R14: ffffc90005237460 R15: 0000000000000008
FS: 00007f50ac6926c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559c40822950 CR3: 00000000696bd000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: 7e 18 jle 0x1a
2: 4c 89 f8 mov %r15,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
e: 74 08 je 0x18
10: 4c 89 ff mov %r15,%rdi
13: e8 c8 7c 87 ff call 0xff877ce0
18: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
1f: 48 8d 6b 40 lea 0x40(%rbx),%rbp
23: 49 89 ef mov %rbp,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 01 01 00 00 jne 0x138
37: 8b 45 00 mov 0x0(%rbp),%eax
3a: 8d 7c 00 04 lea 0x4(%rax,%rax,1),%edi
3e: be .byte 0xbe
3f: c0 .byte 0xc0
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Aug 2, 2025, 7:07:34 AM8/2/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=114bb2a2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16080aa2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/58d8871dc567/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93a71d...@syzkaller.appspotmail.com
syz.0.17[5946]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 64
RAX: 1ffff9200065ae8f RBX: 0000000000000000 RCX: ffff888026720000
RDX: 0000000000000000 RSI: ffffc900032d7460 RDI: ffffc900032d7470
RBP: 0000000000000040 R08: ffffc900032d7497 R09: 0000000000000000
R10: ffffc900032d7460 R11: fffff5200065ae93 R12: ffff88802bef6630
R13: dffffc0000000000 R14: ffffc900032d7460 R15: 0000000000000008
FS: 0000555589313500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
RAX: ffffffffffffffda RBX: 00007ffe2df1b6a0 RCX: 00007f3c3bd9030a
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 00007ffe2df1b660
RBP: 0000200000000180 R08: 00007ffe2df1b6a0 R09: 0000000000000000
RAX: 1ffff9200065ae8f RBX: 0000000000000000 RCX: ffff888026720000
RDX: 0000000000000000 RSI: ffffc900032d7460 RDI: ffffc900032d7470
RBP: 0000000000000040 R08: ffffc900032d7497 R09: 0000000000000000
R10: ffffc900032d7460 R11: fffff5200065ae93 R12: ffff88802bef6630
R13: dffffc0000000000 R14: ffffc900032d7460 R15: 0000000000000008
FS: 0000555589313500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=114e22a2580000
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16080aa2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+93a71d...@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 64
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 5946 Comm: syz.0.17 Not tainted 6.6.101-syzkaller #0
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc900032d7388 EFLAGS: 00010202
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RAX: 1ffff9200065ae8f RBX: 0000000000000000 RCX: ffff888026720000
RDX: 0000000000000000 RSI: ffffc900032d7460 RDI: ffffc900032d7470
RBP: 0000000000000040 R08: ffffc900032d7497 R09: 0000000000000000
R10: ffffc900032d7460 R11: fffff5200065ae93 R12: ffff88802bef6630
R13: dffffc0000000000 R14: ffffc900032d7460 R15: 0000000000000008
FS: 0000555589313500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c3bd71fa0 CR3: 0000000075ea6000 CR4: 00000000003506e0
Call Trace:
<TASK>
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_get_block+0x51c/0xbd0 fs/hfs/extent.c:366
block_read_full_folio+0x42e/0xf40 fs/buffer.c:2406
filemap_read_folio+0x167/0x760 mm/filemap.c:2420
do_read_cache_folio+0x470/0x7e0 mm/filemap.c:3789
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
hfs_btree_open+0x56c/0x10c0 fs/hfs/btree.c:78
hfs_mdb_get+0x12dc/0x2010 fs/hfs/mdb.c:199
hfs_fill_super+0xd1d/0x1320 fs/hfs/super.c:406
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3c3bd9030a
<TASK>
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_get_block+0x51c/0xbd0 fs/hfs/extent.c:366
block_read_full_folio+0x42e/0xf40 fs/buffer.c:2406
filemap_read_folio+0x167/0x760 mm/filemap.c:2420
do_read_cache_folio+0x470/0x7e0 mm/filemap.c:3789
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
hfs_btree_open+0x56c/0x10c0 fs/hfs/btree.c:78
hfs_mdb_get+0x12dc/0x2010 fs/hfs/mdb.c:199
hfs_fill_super+0xd1d/0x1320 fs/hfs/super.c:406
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
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:00007ffe2df1b618 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe2df1b6a0 RCX: 00007f3c3bd9030a
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 00007ffe2df1b660
RBP: 0000200000000180 R08: 00007ffe2df1b6a0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000100
R13: 00007ffe2df1b660 R14: 00000000000002d9 R15: 0000200000000240
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RSP: 0018:ffffc900032d7388 EFLAGS: 00010202
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6a/0x1d0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 7c 87 ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 01 01 00 00 8b 45 00 8d 7c 00 04 be c0
RAX: 1ffff9200065ae8f RBX: 0000000000000000 RCX: ffff888026720000
RDX: 0000000000000000 RSI: ffffc900032d7460 RDI: ffffc900032d7470
RBP: 0000000000000040 R08: ffffc900032d7497 R09: 0000000000000000
R10: ffffc900032d7460 R11: fffff5200065ae93 R12: ffff88802bef6630
R13: dffffc0000000000 R14: ffffc900032d7460 R15: 0000000000000008
FS: 0000555589313500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c3bd71fa0 CR3: 0000000075ea6000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: 7e 18 jle 0x1a
2: 4c 89 f8 mov %r15,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
e: 74 08 je 0x18
10: 4c 89 ff mov %r15,%rdi
13: e8 c8 7c 87 ff call 0xff877ce0
18: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
1f: 48 8d 6b 40 lea 0x40(%rbx),%rbp
23: 49 89 ef mov %rbp,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 01 01 00 00 jne 0x138
37: 8b 45 00 mov 0x0(%rbp),%eax
3a: 8d 7c 00 04 lea 0x4(%rax,%rax,1),%edi
3e: be .byte 0xbe
3f: c0 .byte 0xc0
---
If you want syzbot to run the reproducer, reply with:
Code disassembly (best guess):
0: 7e 18 jle 0x1a
2: 4c 89 f8 mov %r15,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
e: 74 08 je 0x18
10: 4c 89 ff mov %r15,%rdi
13: e8 c8 7c 87 ff call 0xff877ce0
18: 49 c7 07 00 00 00 00 movq $0x0,(%r15)
1f: 48 8d 6b 40 lea 0x40(%rbx),%rbp
23: 49 89 ef mov %rbp,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 01 01 00 00 jne 0x138
37: 8b 45 00 mov 0x0(%rbp),%eax
3a: 8d 7c 00 04 lea 0x4(%rax,%rax,1),%edi
3e: be .byte 0xbe
3f: c0 .byte 0xc0
---
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Sep 14, 2025, 9:49:04 PM9/14/25
to syzkaller...@googlegroups.com
syzbot suspects this issue was fixed by commit:
commit 4f032979b63ad52e08aadf0faeac34ed35133ec0
Author: Viacheslav Dubeyko <sl...@dubeyko.com>
Date: Thu Jul 10 21:36:57 2025 +0000
hfs: fix general protection fault in hfs_find_init()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17a67934580000
start commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
#syz fix: hfs: fix general protection fault in hfs_find_init()
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 4f032979b63ad52e08aadf0faeac34ed35133ec0
Author: Viacheslav Dubeyko <sl...@dubeyko.com>
Date: Thu Jul 10 21:36:57 2025 +0000
hfs: fix general protection fault in hfs_find_init()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17a67934580000
start commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
dashboard link: https://syzkaller.appspot.com/bug?extid=93a71d3cfb4c83a1d545
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=114e22a2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16080aa2580000
If the result looks correct, please mark the issue as fixed by replying with:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16080aa2580000
#syz fix: hfs: fix general protection fault in hfs_find_init()
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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