Message-ID: <67627b39.050a0220.29fcd0.0087.GAE@google.com>
Date: Tue, 17 Dec 2024 23:35:21 -0800
From: syzbot <syzbot+a84181c81389771eb46a@...kaller.appspotmail.com>
To: hch@....de, kch@...dia.com, linux-kernel@...r.kernel.org, 
	linux-nvme@...ts.infradead.org, sagi@...mberg.me, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [nvme?] KASAN: slab-out-of-bounds Read in nvmet_root_discovery_nqn_show

Hello,

syzbot found the following issue on:

HEAD commit:    a0e3919a2df2 Merge tag 'usb-6.13-rc3' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=123cbcdf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=99a5586995ec03b2
dashboard link: https://syzkaller.appspot.com/bug?extid=a84181c81389771eb46a
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/669aa1e15c11/disk-a0e3919a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ee966f8b50ac/vmlinux-a0e3919a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e872e1d072f1/bzImage-a0e3919a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a84181c81389771eb46a@...kaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:646 [inline]
BUG: KASAN: slab-out-of-bounds in string+0x398/0x3d0 lib/vsprintf.c:728
Read of size 1 at addr ffff88814371a8a5 by task syz.0.6476/29206

CPU: 0 UID: 0 PID: 29206 Comm: syz.0.6476 Tainted: G     U             6.13.0-rc2-syzkaller-00333-ga0e3919a2df2 #0
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:489
 kasan_report+0xd9/0x110 mm/kasan/report.c:602
 string_nocheck lib/vsprintf.c:646 [inline]
 string+0x398/0x3d0 lib/vsprintf.c:728
 vsnprintf+0xc67/0x1870 lib/vsprintf.c:2848
 snprintf+0xc8/0x100 lib/vsprintf.c:2983
 nvmet_root_discovery_nqn_show+0x69/0x90 drivers/nvme/target/configfs.c:2250
 fill_read_buffer fs/configfs/file.c:68 [inline]
 configfs_read_iter+0x40d/0x690 fs/configfs/file.c:88
 __kernel_read+0x3f1/0xb50 fs/read_write.c:523
 integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:28
 ima_calc_file_hash_tfm+0x2c9/0x3e0 security/integrity/ima/ima_crypto.c:480
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline]
 ima_calc_file_hash+0x1ba/0x490 security/integrity/ima/ima_crypto.c:568
 ima_collect_measurement+0x8a7/0xa10 security/integrity/ima/ima_api.c:293
 process_measurement+0x1271/0x2370 security/integrity/ima/ima_main.c:372
 ima_file_check+0xc6/0x110 security/integrity/ima/ima_main.c:572
 security_file_post_open+0x8e/0x210 security/security.c:3121
 do_open fs/namei.c:3830 [inline]
 path_openat+0x1419/0x2d60 fs/namei.c:3987
 do_filp_open+0x20c/0x470 fs/namei.c:4014
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402
 do_sys_open fs/open.c:1417 [inline]
 __do_sys_openat fs/open.c:1433 [inline]
 __se_sys_openat fs/open.c:1428 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1428
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3dfbd85d19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f3dfcb03038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3dfbf76080 RCX: 00007f3dfbd85d19
RDX: 0000000000189002 RSI: 0000000020000100 RDI: ffffffffffffff9c
RBP: 00007f3dfbe01a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3dfbf76080 R15: 00007ffc48d63a98
 </TASK>

The buggy address belongs to the object at ffff88814371a880
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes to the right of
 allocated 37-byte region [ffff88814371a880, ffff88814371a8a5)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14371a
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000000 ffff88801ac418c0 ffffea00052a0a40 dead000000000004
raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 8577258261, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab mm/slub.c:2589 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2642
 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920
 __slab_alloc_node mm/slub.c:3995 [inline]
 slab_alloc_node mm/slub.c:4156 [inline]
 __kmalloc_cache_noprof+0xf6/0x420 mm/slub.c:4324
 kmalloc_noprof include/linux/slab.h:901 [inline]
 __kthread_create_on_node+0xcb/0x400 kernel/kthread.c:436
 kthread_create_on_node+0xc8/0x110 kernel/kthread.c:513
 init_rescuer+0x322/0x640 kernel/workqueue.c:5562
 __alloc_workqueue+0xc27/0x1810 kernel/workqueue.c:5731
 alloc_workqueue+0xd3/0x200 kernel/workqueue.c:5772
 nvmet_init+0xd2/0x220 drivers/nvme/target/core.c:1760
 do_one_initcall+0x128/0x630 init/main.c:1266
 do_initcall_level init/main.c:1328 [inline]
 do_initcalls init/main.c:1344 [inline]
 do_basic_setup init/main.c:1363 [inline]
 kernel_init_freeable+0x58f/0x8b0 init/main.c:1577
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88814371a780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff88814371a800: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88814371a880: 00 00 00 00 05 fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88814371a900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff88814371a980: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
==================================================================


---
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