syzbot


KASAN: slab-out-of-bounds Read in ntfs_check_attr_def

Status: upstream: reported C repro on 2024/04/25 14:13
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+977fab364b7723c33cc3@syzkaller.appspotmail.com
First crash: 57d, last: 57d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] KASAN: slab-out-of-bounds Read in ntfs_check_attr_def 0 (1) 2024/04/25 14:13
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/05/05 14:31 21m retest repro linux-next OK log

Sample crash report:
loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS sector size (4096) and media sector size (512).
==================================================================
BUG: KASAN: slab-out-of-bounds in ntfs_check_attr_def+0x2e4/0x690 fs/ntfs3/fsntfs.c:2712
Read of size 4 at addr ffff88802e910b20 by task syz-executor175/5088

CPU: 1 PID: 5088 Comm: syz-executor175 Not tainted 6.9.0-rc4-next-20240418-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 ntfs_check_attr_def+0x2e4/0x690 fs/ntfs3/fsntfs.c:2712
 ntfs_fill_super+0x38ff/0x42e0 fs/ntfs3/super.c:1452
 get_tree_bdev+0x3f7/0x570 fs/super.c:1615
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff236c2b8ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc7927a838 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc7927a840 RCX: 00007ff236c2b8ba
RDX: 000000002001f180 RSI: 000000002001f1c0 RDI: 00007ffc7927a840
RBP: 0000000000000004 R08: 00007ffc7927a880 R09: 000000000001f1ed
R10: 0000000000000005 R11: 0000000000000286 R12: 00007ffc7927a880
R13: 0000000000000003 R14: 0000000000200000 R15: 0000000000000001
 </TASK>

Allocated by task 5088:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4078 [inline]
 __kmalloc_noprof+0x200/0x400 mm/slub.c:4091
 kmalloc_noprof include/linux/slab.h:664 [inline]
 ntfs_fill_super+0x3898/0x42e0 fs/ntfs3/super.c:1440
 get_tree_bdev+0x3f7/0x570 fs/super.c:1615
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802e910a00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 76 bytes to the right of
 allocated 212-byte region [ffff88802e910a00, ffff88802e910ad4)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e910
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000040(head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffefff(slab)
raw: 00fff80000000040 ffff888015041b40 ffffea0000b48380 0000000000000002
raw: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000
head: 00fff80000000040 ffff888015041b40 ffffea0000b48380 0000000000000002
head: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000
head: 00fff80000000001 ffffea0000ba4401 ffffffffffffffff 0000000000000000
head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 133977591 (swapper/0), ts 1, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1476
 prep_new_page mm/page_alloc.c:1484 [inline]
 get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3446
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4704
 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:271 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2259
 allocate_slab+0x5a/0x2e0 mm/slub.c:2422
 new_slab mm/slub.c:2475 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3624
 __slab_alloc+0x58/0xa0 mm/slub.c:3714
 __slab_alloc_node mm/slub.c:3767 [inline]
 slab_alloc_node mm/slub.c:3945 [inline]
 __do_kmalloc_node mm/slub.c:4077 [inline]
 kmalloc_node_track_caller_noprof+0x286/0x440 mm/slub.c:4098
 __do_krealloc mm/slab_common.c:1190 [inline]
 krealloc_noprof+0x7d/0x120 mm/slab_common.c:1223
 add_sysfs_param+0xca/0x7f0 kernel/params.c:654
 kernel_add_sysfs_param+0xb4/0x130 kernel/params.c:817
 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856
 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990
 do_one_initcall+0x248/0x880 init/main.c:1263
 do_initcall_level+0x157/0x210 init/main.c:1325
 do_initcalls+0x3f/0x80 init/main.c:1341
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802e910a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802e910a80: 00 00 00 00 00 00 00 00 00 00 04 fc fc fc fc fc
>ffff88802e910b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88802e910b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802e910c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/21 14:24 linux-next 7b4f2bc91c15 af24b050 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ntfs_check_attr_def
2024/04/21 14:08 linux-next 7b4f2bc91c15 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ntfs_check_attr_def
* Struck through repros no longer work on HEAD.