[v6.1] BUG: unable to handle kernel paging request in open_xa_dir

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e4d90d63d385 Linux 6.1.119
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=138ed3e8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=393f8074c5fb7ad6
dashboard link: https://syzkaller.appspot.com/bug?extid=33ebeba6aa23f90003e0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3986cbf4f35a/disk-e4d90d63.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d2963d16cebb/vmlinux-e4d90d63.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a877a1a23701/Image-e4d90d63.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+33ebeb...@syzkaller.appspotmail.com

REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
Unable to handle kernel paging request at virtual address dfff80000000000d
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
[dfff80000000000d] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4323 Comm: syz-executor Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : d_really_is_negative include/linux/dcache.h:466 [inline]
pc : open_xa_root fs/reiserfs/xattr.c:124 [inline]
pc : open_xa_dir+0xf8/0x578 fs/reiserfs/xattr.c:152
lr : open_xa_dir+0x9c/0x578 fs/reiserfs/xattr.c:150
sp : ffff8000211971c0
x29: ffff800021197240 x28: 000000000000000d x27: dfff800000000000
x26: ffff700004232e38 x25: 0000000000000000 x24: 1fffe0001f1c90cf
x23: 0000000000000068 x22: ffff0000f4db22b0 x21: ffff8000211971e0
x20: 0000000000000002 x19: ffff0000f8e48678 x18: ffff800021197460
x17: 0000000000000000 x16: ffff800012272dc0 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: ffff700004232e3e
x11: 1ffff00004232e3c x10: 0000000000000001 x9 : 0000000000000001
x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff800008dd1b84
x5 : ffff800021197380 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff8000211971e0
Call trace:
d_really_is_negative include/linux/dcache.h:466 [inline]
open_xa_root fs/reiserfs/xattr.c:124 [inline]
open_xa_dir+0xf8/0x578 fs/reiserfs/xattr.c:152
reiserfs_for_each_xattr+0x16c/0x8d8 fs/reiserfs/xattr.c:252
reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364
reiserfs_evict_inode+0x1dc/0x3f0 fs/reiserfs/inode.c:53
evict+0x418/0x894 fs/inode.c:701
iput_final fs/inode.c:1830 [inline]
iput+0x7c0/0x8a4 fs/inode.c:1856
hook_sb_delete+0x688/0xa10 security/landlock/fs.c:1021
security_sb_delete+0x50/0x94 security/security.c:936
generic_shutdown_super+0xac/0x328 fs/super.c:487
kill_block_super+0x70/0xdc fs/super.c:1470
reiserfs_kill_sb+0x134/0x14c fs/reiserfs/super.c:570
deactivate_locked_super+0xac/0x124 fs/super.c:332
deactivate_super+0xf0/0x110 fs/super.c:363
cleanup_mnt+0x394/0x41c fs/namespace.c:1186
__cleanup_mnt+0x20/0x30 fs/namespace.c:1193
task_work_run+0x240/0x2f0 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x2080/0x2cb8 arch/arm64/kernel/signal.c:1132
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
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: 97ee8ddc f94002e8 9101a117 d343fefc (387b6b88)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 97ee8ddc bl 0xffffffffffba3770
4: f94002e8 ldr x8, [x23]
8: 9101a117 add x23, x8, #0x68
c: d343fefc lsr x28, x23, #3
* 10: 387b6b88 ldrb w8, [x28, x27] <-- trapping instruction


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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: e4d90d63d385 Linux 6.1.119
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=10844cdf980000

kernel config: https://syzkaller.appspot.com/x/.config?x=393f8074c5fb7ad6
dashboard link: https://syzkaller.appspot.com/bug?extid=33ebeba6aa23f90003e0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160838f8580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14844cdf980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3986cbf4f35a/disk-e4d90d63.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d2963d16cebb/vmlinux-e4d90d63.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a877a1a23701/Image-e4d90d63.gz.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/ec96b1ad256f/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+33ebeb...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address dfff80000000000d
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
[dfff80000000000d] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:

CPU: 1 PID: 4291 Comm: syz-executor425 Not tainted 6.1.119-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : d_really_is_negative include/linux/dcache.h:466 [inline]
pc : open_xa_root fs/reiserfs/xattr.c:124 [inline]
pc : open_xa_dir+0xf8/0x578 fs/reiserfs/xattr.c:152
lr : open_xa_dir+0x9c/0x578 fs/reiserfs/xattr.c:150

sp : ffff8000211571c0
x29: ffff800021157240 x28: 000000000000000d x27: dfff800000000000
x26: ffff70000422ae38 x25: 0000000000000000 x24: 1fffe0001b3234cf
x23: 0000000000000068 x22: ffff0000e1b48ed0 x21: ffff8000211571e0
x20: 0000000000000002 x19: ffff0000d991a678 x18: ffff800021157460

x17: 0000000000000000 x16: ffff800012272dc0 x15: 0000000000000000

x14: 0000000000000000 x13: 0000000000000000 x12: ffff70000422ae3e
x11: 1ffff0000422ae3c x10: 0000000000000001 x9 : 0000000000000001

x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff800008dd1b84

x5 : ffff800021157380 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff8000211571e0

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