Message-ID: <0000000000003c932e061057a423@google.com>
Date: Thu, 01 Feb 2024 12:14:23 -0800
From: syzbot <syzbot+a4caacbfba68b042e694@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [reiserfs?] KASAN: slab-out-of-bounds Read in
 reiserfs_xattr_get (2)

Hello,

syzbot found the following issue on:

HEAD commit:    0802e17d9aca Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1567a297e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f9616b7e180577ba
dashboard link: https://syzkaller.appspot.com/bug?extid=a4caacbfba68b042e694
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/e84e45f27a78/disk-0802e17d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a8b16d2fc3b1/vmlinux-0802e17d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4c7ac36b3de1/Image-0802e17d.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a4caacbfba68b042e694@...kaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in reiserfs_xattr_get+0xd0/0x96c fs/reiserfs/xattr.c:676
Read of size 8 at addr ffff00012166eb98 by task syz-executor.4/12688

CPU: 1 PID: 12688 Comm: syz-executor.4 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:475
 kasan_report+0xd8/0x138 mm/kasan/report.c:588
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 reiserfs_xattr_get+0xd0/0x96c fs/reiserfs/xattr.c:676
 reiserfs_get_acl+0x94/0x624 fs/reiserfs/xattr_acl.c:215
 __get_acl+0x26c/0x474 fs/posix_acl.c:160
 get_inode_acl+0x34/0x44 fs/posix_acl.c:185
 check_acl+0x40/0x184 fs/namei.c:310
 acl_permission_check fs/namei.c:355 [inline]
 generic_permission+0x2f8/0x498 fs/namei.c:408
 reiserfs_permission+0x74/0xa8 fs/reiserfs/xattr.c:958
 do_inode_permission fs/namei.c:462 [inline]
 inode_permission+0x1d0/0x3b4 fs/namei.c:529
 may_open+0x290/0x3bc fs/namei.c:3249
 do_open fs/namei.c:3620 [inline]
 path_openat+0x1e44/0x2888 fs/namei.c:3779
 do_filp_open+0x1bc/0x3cc fs/namei.c:3809
 do_sys_openat2+0x124/0x1b8 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Allocated by task 12732:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x7c mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xcc/0x1b8 mm/slab_common.c:1020
 kmalloc_array include/linux/slab.h:637 [inline]
 bitmap_alloc+0x34/0x44 lib/bitmap.c:712
 ptp_open+0xf0/0x3a8 drivers/ptp/ptp_chardev.c:116
 posix_clock_open+0x170/0x1f4 kernel/time/posix-clock.c:134
 chrdev_open+0x3c8/0x4dc fs/char_dev.c:414
 do_dentry_open+0x778/0x12b4 fs/open.c:948
 vfs_open+0x7c/0x90 fs/open.c:1082
 do_open fs/namei.c:3622 [inline]
 path_openat+0x1f6c/0x2888 fs/namei.c:3779
 do_filp_open+0x1bc/0x3cc fs/namei.c:3809
 do_sys_openat2+0x124/0x1b8 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1463
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Last potentially related work creation:
 kasan_save_stack+0x40/0x6c mm/kasan/common.c:45
 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502
 kvfree_call_rcu+0xac/0x674 kernel/rcu/tree.c:3400
 drop_sysctl_table+0x2c8/0x410 fs/proc/proc_sysctl.c:1508
 drop_sysctl_table+0x2d8/0x410 fs/proc/proc_sysctl.c:1511
 unregister_sysctl_table+0x48/0x68 fs/proc/proc_sysctl.c:1529
 unregister_net_sysctl_table+0x20/0x30 net/sysctl_net.c:185
 rds_tcp_exit_net+0x53c/0x5cc net/rds/tcp.c:640
 ops_exit_list net/core/net_namespace.c:170 [inline]
 cleanup_net+0x564/0x8d0 net/core/net_namespace.c:614
 process_one_work+0x694/0x1204 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:2781
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857

The buggy address belongs to the object at ffff00012166ea00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 152 bytes to the right of
 allocated 256-byte region [ffff00012166ea00, ffff00012166eb00)

The buggy address belongs to the physical page:
page:00000000727b44d9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16166e
head:00000000727b44d9 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000840 ffff0000c0001b40 fffffc000345d600 dead000000000004
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00012166ea80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff00012166eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff00012166eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff00012166ec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00012166ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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