KASAN: slab-out-of-bounds Write in udf_adinicb_writepage

Status: fixed on 2024/02/26 06:24
Subsystems: udf
[Documentation on labels]
Reported-by: syzbot+a3db10baf0c0ee459854@syzkaller.appspotmail.com
Fix commit: 6f861765464f fs: Block writes to mounted block devices
First crash: 1247d, last: 955d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

  fs: Block writes to mounted block devices

  
▶ ▼ Discussions (8)
Title Replies (including bot) Last reply
[syzbot] [udf?] KASAN: slab-out-of-bounds Write in udf_adinicb_writepage 1 (3) 2024/02/21 18:21
[syzbot] Monthly udf report (Jan 2024) 0 (1) 2024/01/10 20:36
[syzbot] Monthly udf report (Dec 2023) 0 (1) 2023/12/11 09:40
[syzbot] Monthly udf report (Nov 2023) 0 (1) 2023/11/09 18:23
[syzbot] Monthly udf report (Oct 2023) 0 (1) 2023/10/09 09:23
[syzbot] Monthly udf report (Sep 2023) 0 (1) 2023/09/08 14:11
[syzbot] Monthly udf report (Aug 2023) 0 (1) 2023/08/07 12:43
[syzbot] Monthly udf report (Jun 2023) 0 (1) 2023/06/07 09:22
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 KASAN: slab-out-of-bounds Write in udf_adinicb_writepage 21 1 72d 72d 0/2 upstream: reported on 2026/06/07 21:52
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/01/20 08:46 20m retest repro upstream no crash log
2023/10/05 00:55 25m retest repro upstream report log
2023/09/15 17:57 16m retest repro upstream report log
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/02/14 06:55 7h00m bisect fix upstream OK (1) job log
2024/01/06 02:26 1h54m bisect fix upstream OK (0) job log log
2023/12/06 23:13 2h27m bisect fix upstream OK (0) job log log
2023/11/06 07:41 3h03m bisect fix upstream OK (0) job log log
2023/07/26 21:28 3h05m bisect fix upstream OK (0) job log log
2023/05/26 19:23 1h06m bisect fix upstream OK (0) job log log
2023/04/19 06:03 52m bisect fix upstream OK (0) job log log

Sample crash report:
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:391 [inline]
BUG: KASAN: slab-out-of-bounds in udf_adinicb_writepage+0x1e4/0x3f0 fs/udf/inode.c:196
Write of size 800 at addr ffff88801d399800 by task syz-executor314/8665

CPU: 1 PID: 8665 Comm: syz-executor314 Not tainted 6.3.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:319 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:430
 kasan_report+0x176/0x1b0 mm/kasan/report.c:536
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 memcpy_from_page include/linux/highmem.h:391 [inline]
 udf_adinicb_writepage+0x1e4/0x3f0 fs/udf/inode.c:196
 write_cache_pages+0x89e/0x12c0 mm/page-writeback.c:2473
 do_writepages+0x3a6/0x670 mm/page-writeback.c:2551
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 file_write_and_wait_range+0x20f/0x300 mm/filemap.c:781
 __generic_file_fsync+0x72/0x190 fs/libfs.c:1132
 generic_file_fsync+0x73/0xf0 fs/libfs.c:1173
 generic_write_sync include/linux/fs.h:2452 [inline]
 udf_file_write_iter+0x55b/0x660 fs/udf/file.c:126
 do_iter_write+0x6ea/0xc50 fs/read_write.c:861
 iter_file_splice_write+0x843/0xfe0 fs/splice.c:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0xe7/0x1c0 fs/splice.c:1022
 splice_direct_to_actor+0x4c4/0xbd0 fs/splice.c:977
 do_splice_direct+0x283/0x3d0 fs/splice.c:1065
 do_sendfile+0x620/0xff0 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc22ccad869
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc22cc512f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc22cd2c7c0 RCX: 00007fc22ccad869
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fc22ccf8e88 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 6573726168636f69
R13: 0030656c69662f2e R14: 0031656c69662f2e R15: 00007fc22cd2c7c8
 </TASK>

Allocated by task 8665:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc+0xb9/0x230 mm/slab_common.c:980
 udf_new_inode+0x2e7/0xd10
 udf_create+0x21/0xe0 fs/udf/namei.c:384
 lookup_open fs/namei.c:3416 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0x13df/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_creat fs/open.c:1440 [inline]
 __se_sys_creat fs/open.c:1434 [inline]
 __x64_sys_creat+0x123/0x160 fs/open.c:1434
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88801d399800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 allocated 336-byte region [ffff88801d399800, ffff88801d399950)

The buggy address belongs to the physical page:
page:ffffea000074e600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d398
head:ffffea000074e600 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441c80 ffffea00009f6a00 dead000000000002
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 341, tgid 341 (kworker/u4:0), ts 7858900157, free_ts 0
 prep_new_page mm/page_alloc.c:2552 [inline]
 get_page_from_freelist+0x3246/0x33c0 mm/page_alloc.c:4325
 __alloc_pages+0x255/0x670 mm/page_alloc.c:5591
 alloc_slab_page+0x6a/0x160 mm/slub.c:1851
 allocate_slab mm/slub.c:1998 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2051
 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3193
 __slab_alloc mm/slub.c:3292 [inline]
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3491
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1061
 kmalloc include/linux/slab.h:580 [inline]
 kzalloc include/linux/slab.h:720 [inline]
 alloc_bprm+0x57/0x710 fs/exec.c:1511
 kernel_execve+0x96/0xa10 fs/exec.c:1985
 call_usermodehelper_exec_async+0x233/0x370 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801d399800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801d399880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801d399900: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff88801d399980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801d399a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/20 05:10 upstream e8d018dd0257 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: slab-out-of-bounds Write in udf_adinicb_writepage
2023/08/30 10:15 upstream d68b4b6f307d b42ca3a7 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in udf_adinicb_writepage
2023/10/06 21:45 upstream 7de25c855b63 ea12a918 .config console log report info ci2-upstream-fs KASAN: slab-out-of-bounds Write in udf_adinicb_writepage
2023/06/13 21:37 upstream 15adb51c04cc d2ee9228 .config console log report info ci2-upstream-fs KASAN: slab-out-of-bounds Write in udf_adinicb_writepage
2023/03/20 03:28 upstream e8d018dd0257 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Write in udf_adinicb_writepage
* Struck through repros no longer work on HEAD.