syzbot


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

Status: upstream: reported C repro on 2022/09/26 17:49
Reported-by: syzbot+908340a8367281960537@syzkaller.appspotmail.com
First crash: 61d, last: 2h38m

Cause bisection: failed (bisect log)
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: slab-out-of-bounds Write in udf_write_aext C 1 29d 63d 0/1 upstream: reported C repro on 2022/09/25 01:59
linux-4.19 KASAN: slab-out-of-bounds Write in udf_write_aext C error 18 8d08h 391d 0/1 upstream: reported C repro on 2021/10/31 06:20

Sample crash report:
loop0: detected capacity change from 0 to 2048
==================================================================
BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x8bc/0x8f0 fs/udf/inode.c:2103
Write of size 4 at addr ffff8880777c63f8 by task syz-executor216/3611

CPU: 0 PID: 3611 Comm: syz-executor216 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 udf_write_aext+0x8bc/0x8f0 fs/udf/inode.c:2103
 udf_add_entry+0xd03/0x2ac0 fs/udf/namei.c:482
 udf_mkdir+0x145/0x650 fs/udf/namei.c:681
 vfs_mkdir+0x489/0x740 fs/namei.c:4013
 do_mkdirat+0x28c/0x310 fs/namei.c:4038
 __do_sys_mkdir fs/namei.c:4058 [inline]
 __se_sys_mkdir fs/namei.c:4056 [inline]
 __x64_sys_mkdir+0xf2/0x140 fs/namei.c:4056
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fef3beda479
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe952d4e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fef3beda479
RDX: 00007fef3be986e3 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007fef3be999b0 R08: 00007ffe952d4d10 R09: 0000000000000000
R10: 00007ffe952d4cf0 R11: 0000000000000246 R12: 00007fef3be99a40
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3611:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 ____kasan_kmalloc mm/kasan/common.c:516 [inline]
 ____kasan_kmalloc mm/kasan/common.c:475 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525
 kmalloc include/linux/slab.h:600 [inline]
 kmalloc_array include/linux/slab.h:639 [inline]
 kcalloc include/linux/slab.h:671 [inline]
 udf_process_sequence+0xe9/0x4470 fs/udf/super.c:1689
 udf_load_sequence fs/udf/super.c:1813 [inline]
 udf_check_anchor_block+0x44b/0x640 fs/udf/super.c:1852
 udf_scan_anchors+0x1b3/0x6d0 fs/udf/super.c:1885
 udf_find_anchor fs/udf/super.c:1941 [inline]
 udf_load_vrs+0x27b/0xbe0 fs/udf/super.c:2006
 udf_fill_super+0x859/0x1a40 fs/udf/super.c:2184
 mount_bdev+0x34d/0x410 fs/super.c:1400
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 3611:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:367 [inline]
 ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1759 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785
 slab_free mm/slub.c:3539 [inline]
 kfree+0xe2/0x580 mm/slub.c:4567
 udf_process_sequence+0x421/0x4470 fs/udf/super.c:1781
 udf_load_sequence fs/udf/super.c:1813 [inline]
 udf_check_anchor_block+0x44b/0x640 fs/udf/super.c:1852
 udf_scan_anchors+0x1b3/0x6d0 fs/udf/super.c:1885
 udf_find_anchor fs/udf/super.c:1941 [inline]
 udf_load_vrs+0x27b/0xbe0 fs/udf/super.c:2006
 udf_fill_super+0x859/0x1a40 fs/udf/super.c:2184
 mount_bdev+0x34d/0x410 fs/super.c:1400
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8880777c6000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 504 bytes to the right of
 512-byte region [ffff8880777c6000, ffff8880777c6200)

The buggy address belongs to the physical page:
page:ffffea0001ddf100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x777c4
head:ffffea0001ddf100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888011841c80
raw: 0000000000000000 0000000080100010 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 2972, tgid 2972 (udevadm), ts 11705893480, free_ts 9906278250
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x84f/0xe80 mm/slub.c:3036
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 kmem_cache_alloc_trace+0x323/0x3e0 mm/slub.c:3287
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 kernfs_fop_open+0x31a/0xec0 fs/kernfs/file.c:666
 do_dentry_open+0x6cc/0x13f0 fs/open.c:882
 do_open fs/namei.c:3557 [inline]
 path_openat+0x1c92/0x28f0 fs/namei.c:3691
 do_filp_open+0x1b6/0x400 fs/namei.c:3718
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
 free_contig_range+0xb1/0x180 mm/page_alloc.c:9457
 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x2945/0x29d6 mm/debug_vm_pgtable.c:1354
 do_one_initcall+0xfe/0x650 init/main.c:1296
 do_initcall_level init/main.c:1369 [inline]
 do_initcalls init/main.c:1385 [inline]
 do_basic_setup init/main.c:1404 [inline]
 kernel_init_freeable+0x6b1/0x73a init/main.c:1623
 kernel_init+0x1a/0x1d0 init/main.c:1512
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff8880777c6280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880777c6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880777c6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8880777c6400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880777c6480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (258):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/10/18 09:36 upstream 55be6084c8e0 754863b4 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/10/09 20:27 upstream a6afa4199d3d aea5da89 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-root 2022/10/09 08:06 upstream a6afa4199d3d aea5da89 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-root 2022/10/06 18:52 upstream 833477fce7a1 131b38ac .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/10/03 12:23 upstream a962b54e162c feb56351 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/10/01 16:50 upstream ffb4d94b4314 feb56351 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-root 2022/09/26 14:13 upstream f76349cf4145 d59ba983 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-linux-next-kasan-gce-root 2022/11/17 05:54 linux-next 15f3bff12cf6 3a127a31 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-linux-next-kasan-gce-root 2022/11/04 21:37 linux-next 0cdb3579f1ee 6d752409 .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-linux-next-kasan-gce-root 2022/10/31 17:37 linux-next 4d48f589d294 2a71366b .config log report syz C KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/27 00:05 upstream 644e9524388a f4470a7b .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/26 20:01 upstream 644e9524388a f4470a7b .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/26 13:39 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/26 12:25 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/24 18:00 upstream 4312098baf37 ff68ff8f .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/24 14:32 upstream 4312098baf37 ff68ff8f .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/24 02:35 upstream eb7081409f94 52fdf57a .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/23 21:56 upstream eb7081409f94 52fdf57a .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/23 19:40 upstream eb7081409f94 52fdf57a .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/22 08:58 upstream eb7081409f94 1c576c23 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/22 05:39 upstream eb7081409f94 1c576c23 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 22:57 upstream eb7081409f94 1c576c23 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 21:09 upstream eb7081409f94 1c576c23 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 16:04 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 14:23 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 13:20 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-selinux-root 2022/11/21 11:29 upstream 77c51ba552a1 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 10:01 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 07:07 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 05:33 upstream eb7081409f94 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 02:06 upstream 77c51ba552a1 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/21 00:41 upstream 77c51ba552a1 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/20 21:37 upstream 77c51ba552a1 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/20 20:07 upstream 77c51ba552a1 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/20 13:16 upstream fe24a97cf254 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/20 08:37 upstream fe24a97cf254 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/20 02:41 upstream fe24a97cf254 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/19 20:33 upstream fe24a97cf254 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/19 14:01 upstream ab290eaddc4c 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/19 10:38 upstream ab290eaddc4c 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/19 05:06 upstream ab290eaddc4c 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/19 00:22 upstream ab290eaddc4c 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/18 17:14 upstream 84368d882b96 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/18 09:42 upstream 84368d882b96 5bb70014 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/17 23:10 upstream 81ac25651a62 4ba8ab94 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/17 17:40 upstream cc675d22e422 4ba8ab94 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/17 15:41 upstream cc675d22e422 4ba8ab94 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/17 04:43 upstream 59d0d52c30d4 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/16 20:47 upstream 59d0d52c30d4 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/16 19:24 upstream 59d0d52c30d4 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/16 16:11 upstream 81e7cfa3a9eb 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/16 05:09 upstream 81e7cfa3a9eb 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/16 00:15 upstream 81e7cfa3a9eb 3a127a31 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/15 06:09 upstream e01d50cbd6ee 97de9cfc .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 19:51 upstream 094226ad94f4 943f4cb8 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 13:26 upstream 094226ad94f4 943f4cb8 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 13:13 upstream 094226ad94f4 943f4cb8 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 09:57 upstream 094226ad94f4 7ba4d859 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 03:03 upstream af7a05689189 7ba4d859 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci2-upstream-fs 2022/11/14 00:12 upstream af7a05689189 7ba4d859 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-root 2022/11/09 16:57 upstream f141df371335 5fa28208 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-kasan-gce-smack-root 2022/10/27 14:17 upstream 98555239e4c3 86777b7f .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
ci-upstream-linux-next-kasan-gce-root 2022/11/22 22:05 linux-next 15f3bff12cf6 9da37ae8 .config log report info KASAN: slab-out-of-bounds Write in udf_write_aext
* Struck through repros no longer work on HEAD.