syzbot


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

Status: fixed on 2023/06/08 14:41
Subsystems: bpf
[Documentation on labels]
Reported-by: syzbot+59af7bf76d795311da8c@syzkaller.appspotmail.com
Fix commit: 45435d8da71f bpf: Always use maximal size for copy_array()
First crash: 490d, last: 469d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 45435d8da71f9f3e6860e6e6ea9667b6ec17ec64
Author: Kees Cook <keescook@chromium.org>
Date: Fri Dec 23 18:28:44 2022 +0000

  bpf: Always use maximal size for copy_array()

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] KASAN: slab-out-of-bounds Write in copy_verifier_state 3 (7) 2023/02/07 10:27
Last patch testing requests (4)
Created Duration User Patch Repo Result
2022/12/23 18:10 18m v4bel@theori.io patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8395ae05cb5a2e31d36106e8c85efa11cda849b OK log
2022/12/23 16:32 19m v4bel@theori.io patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8395ae05cb5a2e31d36106e8c85efa11cda849b OK log
2022/12/23 15:54 0m v4bel@theori.io patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8395ae05cb5a2e31d36106e8c85efa11cda849be error OK
2022/12/20 19:57 18m sdf@google.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 041fae9c105a OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in copy_array kernel/bpf/verifier.c:1072 [inline]
BUG: KASAN: slab-out-of-bounds in copy_verifier_state+0x130/0xbe0 kernel/bpf/verifier.c:1250
Write of size 80 at addr ffff888022c71000 by task syz-executor186/5067

CPU: 0 PID: 5067 Comm: syz-executor186 Not tainted 6.1.0-syzkaller-10971-g041fae9c105a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:306
 print_report+0x107/0x220 mm/kasan/report.c:417
 kasan_report+0x139/0x170 mm/kasan/report.c:517
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 memcpy+0x3c/0x60 mm/kasan/shadow.c:66
 copy_array kernel/bpf/verifier.c:1072 [inline]
 copy_verifier_state+0x130/0xbe0 kernel/bpf/verifier.c:1250
 pop_stack kernel/bpf/verifier.c:1314 [inline]
 do_check+0x8e51/0x107b0 kernel/bpf/verifier.c:14031
 do_check_common+0x909/0x1800 kernel/bpf/verifier.c:16289
 do_check_main kernel/bpf/verifier.c:16352 [inline]
 bpf_check+0x107e2/0x16170 kernel/bpf/verifier.c:16936
 bpf_prog_load+0x1306/0x1be0 kernel/bpf/syscall.c:2619
 __sys_bpf+0x396/0x6d0 kernel/bpf/syscall.c:4979
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5081
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff1fb190c29
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeaae55678 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff1fb190c29
RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00007ff1fb154dd0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ff1fb154e60
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 5067:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 __kasan_krealloc+0xbf/0xf0 mm/kasan/common.c:439
 kasan_krealloc include/linux/kasan.h:231 [inline]
 __do_krealloc mm/slab_common.c:1361 [inline]
 krealloc+0xb2/0x110 mm/slab_common.c:1398
 push_jmp_history kernel/bpf/verifier.c:2592 [inline]
 is_state_visited kernel/bpf/verifier.c:13552 [inline]
 do_check+0x9433/0x107b0 kernel/bpf/verifier.c:13752
 do_check_common+0x909/0x1800 kernel/bpf/verifier.c:16289
 do_check_main kernel/bpf/verifier.c:16352 [inline]
 bpf_check+0x107e2/0x16170 kernel/bpf/verifier.c:16936
 bpf_prog_load+0x1306/0x1be0 kernel/bpf/syscall.c:2619
 __sys_bpf+0x396/0x6d0 kernel/bpf/syscall.c:4979
 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5081 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5081
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888022c71000
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff888022c71000, ffff888022c71060)

The buggy address belongs to the physical page:
page:ffffea00008b1c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22c71
ksm flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffff888012841780 ffffea0000a6d880 0000000000000003
raw: 0000000000000000 0000000080200020 00000001ffffffff 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 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 4437, tgid 4437 (udevd), ts 26581643327, free_ts 26581082061
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0xbd/0x190 mm/slub.c:1851
 allocate_slab+0x5e/0x3c0 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0x7f4/0xeb0 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+0x25b/0x340 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc+0x9e/0x190 mm/slab_common.c:981
 kmalloc include/linux/slab.h:584 [inline]
 kzalloc include/linux/slab.h:720 [inline]
 tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
 tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x5ae/0x5f0 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x280/0x680 security/tomoyo/file.c:822
 security_inode_getattr+0xc0/0x140 security/security.c:1375
 vfs_getattr fs/stat.c:161 [inline]
 vfs_statx+0x198/0x4b0 fs/stat.c:236
 vfs_fstatat fs/stat.c:270 [inline]
 __do_sys_newfstatat fs/stat.c:440 [inline]
 __se_sys_newfstatat+0x104/0x7b0 fs/stat.c:434
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 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:1446 [inline]
 free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464
 free_pipe_info+0x302/0x380 fs/pipe.c:851
 put_pipe_info fs/pipe.c:711 [inline]
 pipe_release+0x232/0x310 fs/pipe.c:734
 __fput+0x3ba/0x880 fs/file_table.c:320
 task_work_run+0x243/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888022c70f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888022c70f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888022c71000: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff888022c71080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888022c71100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================

Crashes (825):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/15 19:25 upstream 041fae9c105a 6f9c033e .config strace log report syz C ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/06 02:29 upstream 41c03ba9beea 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/06 01:21 upstream 41c03ba9beea 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 21:25 upstream 41c03ba9beea 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 20:07 upstream 41c03ba9beea 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 09:36 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 05:28 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 05:23 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 04:20 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/05 03:53 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 19:37 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 16:44 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 16:26 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 13:43 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 12:39 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 04:02 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 01:48 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/04 00:08 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 23:45 upstream 69b41ac87e4a 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 15:08 upstream 69b41ac87e4a ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 13:59 upstream 69b41ac87e4a ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 12:45 upstream 69b41ac87e4a ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 10:54 upstream 69b41ac87e4a ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/03 02:54 upstream 88603b6dc419 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 21:16 upstream 88603b6dc419 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 12:06 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 11:34 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 07:39 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 06:21 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 04:02 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/02 01:53 upstream 150aae354b81 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 22:51 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 21:48 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 18:44 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 17:16 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 14:14 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 13:25 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 12:06 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 07:33 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 05:08 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2023/01/01 04:50 upstream e4cf7c25bae5 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2022/12/31 19:35 upstream c8451c141e07 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2022/12/31 17:28 upstream c8451c141e07 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2022/12/31 15:04 upstream c8451c141e07 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2022/12/31 13:36 upstream c8451c141e07 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
2022/12/15 10:30 upstream 041fae9c105a 6f9c033e .config console log report info ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Write in copy_verifier_state
* Struck through repros no longer work on HEAD.