syzbot


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

Status: upstream: reported C repro on 2024/04/05 06:55
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+b71011ec0a23f4d15625@syzkaller.appspotmail.com
First crash: 53d, last: 39d
Cause bisection: introduced by (bisect log) [merge commit]:
commit 1fa6ffad12753ea49e05f8ee1bc7e40684bdaca7
Author: Jakub Kicinski <kuba@kernel.org>
Date: Sat Aug 26 01:35:08 2023 +0000

  Merge tag 'wireless-next-2023-08-25' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next

Crash: lost connection to test machine (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[PATCH] net/socket: the length value of the input socket option parameter is too small 11 (11) 2024/04/09 18:27
[PATCH] Bluetooth: fix oob in sco_sock_setsockopt 2 (2) 2024/04/09 14:13
[syzbot] [bluetooth?] KASAN: slab-out-of-bounds Read in sco_sock_setsockopt 1 (3) 2024/04/06 13:41
Last patch testing requests (5)
Created Duration User Patch Repo Result
2024/05/03 08:23 3h21m retest repro linux-next OK log
2024/05/03 00:50 25m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2024/05/03 00:50 23m retest repro upstream OK log
2024/05/03 00:50 26m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2024/04/05 10:20 38m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in sco_sock_setsockopt+0xc0b/0xf90 net/bluetooth/sco.c:893
Read of size 4 at addr ffff8880296aeb83 by task syz-executor142/5061

CPU: 0 PID: 5061 Comm: syz-executor142 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #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
 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 copy_from_sockptr include/linux/sockptr.h:55 [inline]
 sco_sock_setsockopt+0xc0b/0xf90 net/bluetooth/sco.c:893
 do_sock_setsockopt+0x3af/0x720 net/socket.c:2311
 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fe1069a9d89
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:00007ffdb5d99c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe1069a9d89
RDX: 0000000000000010 RSI: 0000000000000112 RDI: 0000000000000007
RBP: 0000000000000006 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000555584ea7338
R13: 000000000000000e R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 5061:
 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:3966 [inline]
 __kmalloc+0x233/0x4a0 mm/slub.c:3979
 kmalloc include/linux/slab.h:632 [inline]
 __cgroup_bpf_run_filter_setsockopt+0xd2f/0x1040 kernel/bpf/cgroup.c:1869
 do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293
 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

The buggy address belongs to the object at ffff8880296aeb80
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 1 bytes to the right of
 allocated 2-byte region [ffff8880296aeb80, ffff8880296aeb82)

The buggy address belongs to the physical page:
page:ffffea0000a5ab80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x296ae
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888014c41280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080800080 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 18614896584, free_ts 17708736389
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2175
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2391
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmalloc_trace+0x269/0x360 mm/slub.c:3992
 kmalloc include/linux/slab.h:628 [inline]
 kzalloc include/linux/slab.h:749 [inline]
 add_sysfs_param+0x541/0x7f0 kernel/params.c:646
 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+0x238/0x830 init/main.c:1241
 do_initcall_level+0x157/0x210 init/main.c:1303
 do_initcalls+0x3f/0x80 init/main.c:1319
 kernel_init_freeable+0x435/0x5d0 init/main.c:1550
 kernel_init+0x1d/0x2a0 init/main.c:1439
page last free pid 57 tgid 57 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1140 [inline]
 free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
 vfree+0x186/0x2e0 mm/vmalloc.c:2914
 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:2835
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

Memory state around the buggy address:
 ffff8880296aea80: 00 fc fc fc 00 fc fc fc fa fc fc fc 07 fc fc fc
 ffff8880296aeb00: 07 fc fc fc fa fc fc fc 00 fc fc fc 00 fc fc fc
>ffff8880296aeb80: 02 fc fc fc 04 fc fc fc 04 fc fc fc fa fc fc fc
                   ^
 ffff8880296aec00: fa fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc
 ffff8880296aec80: 00 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
==================================================================

Crashes (28):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/05 01:48 upstream fe46a7dd189e 0ee3535e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 01:32 linux-next 2b3d5988ae2c 0ee3535e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 18:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 18ea8213 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 17:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 18ea8213 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/13 09:09 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/09 09:48 upstream fe46a7dd189e 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/07 17:32 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/07 05:11 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/07 04:57 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 07:30 upstream fe46a7dd189e 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 06:02 upstream fe46a7dd189e 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 01:13 upstream fe46a7dd189e 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/04 10:06 upstream fe46a7dd189e 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 01:00 linux-next 2b3d5988ae2c 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/05 00:48 linux-next 2b3d5988ae2c 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/18 12:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/18 12:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/17 10:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/16 08:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/16 08:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/16 08:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/15 23:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b 0d592ce4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/15 18:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/14 06:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/14 06:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5d2afe8745b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/10 11:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fec50db7033e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/10 11:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fec50db7033e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
2024/04/06 10:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in sco_sock_setsockopt
* Struck through repros no longer work on HEAD.