syzbot


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

Status: upstream: reported C repro on 2024/04/02 17:54
Subsystems: nfs
[Documentation on labels]
Reported-by: syzbot+4139435cb1b34cf759c2@syzkaller.appspotmail.com
Fix commit: fs: Annotate struct file_handle with __counted_by() and use struct_size()
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb]
First crash: 19d, last: 16d
Discussions (3)
Title Replies (including bot) Last reply
Re: [linux-next:master] [fs] 1b43c46297: kernel_BUG_at_mm/usercopy.c 3 (3) 2024/04/05 10:26
[PATCH next] fs: fix oob in do_handle_open 4 (4) 2024/04/03 12:59
[syzbot] [nfs?] KASAN: slab-out-of-bounds Write in do_handle_open 0 (1) 2024/04/02 17:54

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in instrument_copy_from_user_before include/linux/instrumented.h:129 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x7b/0xe0 lib/usercopy.c:22
Write of size 24 at addr ffff888028569608 by task syz-executor278/5097

CPU: 1 PID: 5097 Comm: syz-executor278 Not tainted 6.9.0-rc2-next-20240403-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
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_copy_from_user_before include/linux/instrumented.h:129 [inline]
 _copy_from_user+0x7b/0xe0 lib/usercopy.c:22
 copy_from_user include/linux/uaccess.h:183 [inline]
 handle_to_path fs/fhandle.c:203 [inline]
 do_handle_open+0x204/0x660 fs/fhandle.c:226
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7fc55f7ec2a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffbed0af38 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007fffbed0b118 RCX: 00007fc55f7ec2a9
RDX: 0000000000002000 RSI: 00000000200019c0 RDI: 00000000ffffffff
RBP: 00007fc55f85f610 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffbed0b108 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 5097:
 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:4069 [inline]
 __kmalloc_noprof+0x200/0x410 mm/slub.c:4082
 kmalloc_noprof include/linux/slab.h:664 [inline]
 handle_to_path fs/fhandle.c:195 [inline]
 do_handle_open+0x162/0x660 fs/fhandle.c:226
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

The buggy address belongs to the object at ffff888028569600
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 allocated 24-byte region [ffff888028569600, ffff888028569618)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28569
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffefff(slab)
raw: 00fff80000000000 ffff888015041500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080400040 00000001ffffefff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid -1535921372 (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:1490
 prep_new_page mm/page_alloc.c:1498 [inline]
 get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712
 __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:2249
 allocate_slab+0x5a/0x2e0 mm/slub.c:2412
 new_slab mm/slub.c:2465 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3615
 __slab_alloc+0x58/0xa0 mm/slub.c:3705
 __slab_alloc_node mm/slub.c:3758 [inline]
 slab_alloc_node mm/slub.c:3936 [inline]
 __do_kmalloc_node mm/slub.c:4068 [inline]
 __kmalloc_noprof+0x25e/0x410 mm/slub.c:4082
 kmalloc_noprof include/linux/slab.h:664 [inline]
 kzalloc_noprof include/linux/slab.h:775 [inline]
 kobject_get_path+0xb8/0x230 lib/kobject.c:161
 kobject_uevent_env+0x2a5/0x8e0 lib/kobject_uevent.c:530
 kernel_add_sysfs_param+0x10a/0x130 kernel/params.c:821
 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:1258
 do_initcall_level+0x157/0x210 init/main.c:1320
 do_initcalls+0x3f/0x80 init/main.c:1336
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888028569500: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888028569580: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff888028569600: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
                            ^
 ffff888028569680: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888028569700: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================

Crashes (643):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/04 00:02 linux-next 727900b675b7 fed899ed .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 18:33 linux-next 727900b675b7 fed899ed .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/02 18:17 linux-next c0b832517f62 6baf5069 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/02 07:35 linux-next c0b832517f62 6baf5069 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 11:35 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 10:53 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 09:37 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 09:34 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 08:33 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 08:26 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 07:18 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 06:17 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 05:49 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 04:48 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 03:46 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 03:17 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 02:06 linux-next 727900b675b7 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/04 00:39 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 23:54 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 22:42 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 21:51 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 21:49 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 20:41 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 20:08 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 18:49 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 17:57 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 16:46 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 16:24 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 15:20 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 14:10 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 13:42 linux-next 727900b675b7 fed899ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 11:05 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 10:55 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 09:48 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 09:30 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 08:25 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 07:37 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 06:16 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 05:27 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 04:24 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 04:23 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 03:16 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 02:09 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 01:21 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/03 00:16 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
2024/04/02 23:15 linux-next c0b832517f62 7925100d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in do_handle_open
* Struck through repros no longer work on HEAD.