KMSAN: uninit-value in xfrm_user_rcv_msg

KMSAN: uninit-value in xfrm_user_rcv_msg_compat
Status: upstream: reported on 2021/01/03 06:59
Reported-by: syzbot+f00248cacdd6d71ea79c@syzkaller.appspotmail.com
First crash: 106d, last: 7m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in xfrm_user_rcv_msg_compat	C	unreliable		613	11m	99d	0/22	upstream: reported C repro on 2021/01/05 12:42

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in xfrm_user_rcv_msg_compat+0x1c4a/0x1e90 net/xfrm/xfrm_compat.c:563
CPU: 1 PID: 30751 Comm: syz-executor.2 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 xfrm_user_rcv_msg_compat+0x1c4a/0x1e90 net/xfrm/xfrm_compat.c:563
 xfrm_user_rcv_msg+0x493/0xf40 net/xfrm/xfrm_user.c:2774
 netlink_rcv_skb+0x6fa/0x810 net/netlink/af_netlink.c:2502
 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2824
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x11d6/0x14a0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x1740/0x1840 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x714/0x830 net/socket.c:2433
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:351
 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:167
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:210
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fb2549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55ac5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----attrs@xfrm_user_rcv_msg_compat created at:
 xfrm_user_rcv_msg_compat+0xe9/0x1e90 net/xfrm/xfrm_compat.c:540
 xfrm_user_rcv_msg_compat+0xe9/0x1e90 net/xfrm/xfrm_compat.c:540
=====================================================
=====================================================
BUG: KMSAN: uninit-value in kmalloc_slab+0x289/0x290 mm/slab_common.c:707
CPU: 1 PID: 30751 Comm: syz-executor.2 Tainted: G    B   W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 kmalloc_slab+0x289/0x290 mm/slab_common.c:707
 __kmalloc_node+0xe0/0x1440 mm/slub.c:4111
 kmalloc_node include/linux/slab.h:577 [inline]
 kvmalloc_node+0x201/0x3d0 mm/util.c:587
 kvmalloc include/linux/mm.h:785 [inline]
 xfrm_user_rcv_msg_compat+0x848/0x1e90 net/xfrm/xfrm_compat.c:567
 xfrm_user_rcv_msg+0x493/0xf40 net/xfrm/xfrm_user.c:2774
 netlink_rcv_skb+0x6fa/0x810 net/netlink/af_netlink.c:2502
 xfrm_netlink_rcv+0xb2/0xf0 net/xfrm/xfrm_user.c:2824
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x11d6/0x14a0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x1740/0x1840 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x714/0x830 net/socket.c:2433
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:351
 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:167
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:210
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fb2549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55ac5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----attrs@xfrm_user_rcv_msg_compat created at:
 xfrm_user_rcv_msg_compat+0xe9/0x1e90 net/xfrm/xfrm_compat.c:540
 xfrm_user_rcv_msg_compat+0xe9/0x1e90 net/xfrm/xfrm_compat.c:540
=====================================================

Crashes (1986):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kmsan-gce-386	2021/04/15 06:01	https://github.com/google/kmsan.git master	4ebaab5f	fcdb12ba	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 22:59	https://github.com/google/kmsan.git master	4ebaab5f	fcdb12ba	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 20:39	https://github.com/google/kmsan.git master	4ebaab5f	3134b37f	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 20:39	https://github.com/google/kmsan.git master	4ebaab5f	3134b37f	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 18:56	https://github.com/google/kmsan.git master	4ebaab5f	3134b37f	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 14:17	https://github.com/google/kmsan.git master	4ebaab5f	3134b37f	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 09:57	https://github.com/google/kmsan.git master	4ebaab5f	3134b37f	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 06:20	https://github.com/google/kmsan.git master	4ebaab5f	a184b83e	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 03:38	https://github.com/google/kmsan.git master	4ebaab5f	a184b83e	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/14 00:51	https://github.com/google/kmsan.git master	4ebaab5f	a184b83e	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 23:14	https://github.com/google/kmsan.git master	4ebaab5f	a184b83e	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 11:16	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 09:35	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 08:23	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 01:42	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/13 01:34	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 16:32	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 14:57	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 13:32	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 12:29	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 08:13	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 07:12	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 04:40	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 03:31	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/12 01:57	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 21:16	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 20:01	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 17:31	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 16:01	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 14:47	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 13:39	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 12:27	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 09:55	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 09:54	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 02:30	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/11 01:18	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 23:54	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 20:50	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 18:20	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 15:29	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 11:02	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 06:42	https://github.com/google/kmsan.git master	4ebaab5f	6a81331a	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/10 04:37	https://github.com/google/kmsan.git master	4ebaab5f	6a81331a	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/04/09 19:31	https://github.com/google/kmsan.git master	4ebaab5f	6a81331a	.config	log	report	info	KMSAN: uninit-value in xfrm_user_rcv_msg_compat
ci-upstream-kmsan-gce-386	2021/01/17 11:15	https://github.com/google/kmsan.git master	73d62e81	65a7a854	.config	log	report	info
ci-upstream-kmsan-gce-386	2021/01/03 06:51	https://github.com/google/kmsan.git master	73d62e81	79264ae3	.config	log	report	info
ci-upstream-kmsan-gce-386	2020/12/30 00:56	https://github.com/google/kmsan.git master	73d62e81	80910769	.config	log	report	info
ci-upstream-kmsan-gce-386	2020/12/30 00:02	https://github.com/google/kmsan.git master	73d62e81	80910769	.config	log	report	info