syzbot


KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern

Status: upstream: reported on 2024/05/06 08:26
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+bbafcc77279b6c156e52@syzkaller.appspotmail.com
First crash: 327d, last: 27d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern 0 (1) 2024/05/06 08:26

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 cmsghdr_from_user_compat_to_kern+0x568/0x10d0 net/compat.c:154
 ____sys_sendmsg+0x22c/0xda0 net/socket.c:2535
 __sys_sendmsg_sock+0x42/0x60 net/socket.c:2639
 io_sendmsg+0x36a/0xe30 io_uring/net.c:544
 io_issue_sqe+0x394/0x1fb0 io_uring/io_uring.c:1737
 io_queue_sqe io_uring/io_uring.c:1947 [inline]
 io_submit_sqe io_uring/io_uring.c:2204 [inline]
 io_submit_sqes+0x11c3/0x2ff0 io_uring/io_uring.c:2321
 __do_sys_io_uring_enter io_uring/io_uring.c:3372 [inline]
 __se_sys_io_uring_enter+0x41d/0x4da0 io_uring/io_uring.c:3307
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3307
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was stored to memory at:
 io_sendmsg+0x694/0xe30 io_uring/net.c:542
 io_issue_sqe+0x394/0x1fb0 io_uring/io_uring.c:1737
 io_queue_sqe io_uring/io_uring.c:1947 [inline]
 io_submit_sqe io_uring/io_uring.c:2204 [inline]
 io_submit_sqes+0x11c3/0x2ff0 io_uring/io_uring.c:2321
 __do_sys_io_uring_enter io_uring/io_uring.c:3372 [inline]
 __se_sys_io_uring_enter+0x41d/0x4da0 io_uring/io_uring.c:3307
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3307
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 __alloc_frozen_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4762
 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2270
 alloc_frozen_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2341
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x23a/0x1110 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0x1287/0x3540 mm/slub.c:3826
 __kmem_cache_alloc_bulk mm/slub.c:5045 [inline]
 kmem_cache_alloc_bulk_noprof+0x486/0x1330 mm/slub.c:5117
 __io_alloc_req_refill+0x84/0x5b0 io_uring/io_uring.c:965
 io_alloc_req io_uring/io_uring.h:435 [inline]
 io_submit_sqes+0x90f/0x2ff0 io_uring/io_uring.c:2310
 __do_sys_io_uring_enter io_uring/io_uring.c:3372 [inline]
 __se_sys_io_uring_enter+0x41d/0x4da0 io_uring/io_uring.c:3307
 __ia32_sys_io_uring_enter+0x11d/0x1a0 io_uring/io_uring.c:3307
 ia32_sys_call+0xd59/0x4180 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 7079 Comm: syz.3.431 Not tainted 6.14.0-rc4-syzkaller-00199-g76544811c850 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================

Crashes (2352):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/01 00:55 upstream 76544811c850 1e7a43e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/28 22:48 upstream 76544811c850 1e7a43e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/28 09:18 upstream 1e15510b71c9 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/28 08:01 upstream 1e15510b71c9 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/28 08:01 upstream 1e15510b71c9 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/27 22:38 upstream dd83757f6e68 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/27 21:35 upstream dd83757f6e68 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/27 20:01 upstream dd83757f6e68 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/27 09:50 upstream 5394eea10651 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/27 06:55 upstream 5394eea10651 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/26 15:39 upstream ac9c34d1e45a d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/26 15:20 upstream ac9c34d1e45a d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/26 04:09 upstream 2a1944bff549 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/26 01:15 upstream 2a1944bff549 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 16:50 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 13:01 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 12:02 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 10:05 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 09:05 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/25 08:11 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/24 09:58 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/24 06:34 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/24 05:29 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 21:19 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 21:13 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 18:40 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 17:29 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 16:23 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 16:12 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 07:29 upstream 5cf80612d3f7 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/23 04:06 upstream 5cf80612d3f7 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/22 14:15 upstream ff202c5028a1 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/22 09:21 upstream ff202c5028a1 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/22 06:55 upstream ff202c5028a1 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/22 06:26 upstream ff202c5028a1 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 23:57 upstream 334426094588 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 22:14 upstream 334426094588 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 13:15 upstream 27eddbf34490 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 11:15 upstream 27eddbf34490 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 11:15 upstream 27eddbf34490 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 10:05 upstream 27eddbf34490 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2025/02/21 07:46 upstream 27eddbf34490 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
2024/05/05 05:13 upstream 7367539ad4b0 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in cmsghdr_from_user_compat_to_kern
* Struck through repros no longer work on HEAD.