CVE-2022-50265

In the Linux kernel, the following vulnerability has been resolved:

kcm: annotate data-races around kcm->rx_wait

kcm->rxpsock can be read locklessly in kcmrfree(). Annotate the read and writes accordingly.

syzbot reported:

BUG: KCSAN: data-race in kcmrcvstrparser / kcm_rfree

write to 0xffff88810784e3d0 of 1 bytes by task 1823 on cpu 1: reserverxkcm net/kcm/kcmsock.c:283 [inline] kcmrcvstrparser+0x250/0x3a0 net/kcm/kcmsock.c:363 _strprecv+0x64c/0xd20 net/strparser/strparser.c:301 strprecv+0x6d/0x80 net/strparser/strparser.c:335 tcpreadsock+0x13e/0x5a0 net/ipv4/tcp.c:1703 strpreadsock net/strparser/strparser.c:358 [inline] dostrpwork net/strparser/strparser.c:406 [inline] strpwork+0xe8/0x180 net/strparser/strparser.c:415 processonework+0x3d3/0x720 kernel/workqueue.c:2289 workerthread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 retfromfork+0x1f/0x30 arch/x86/entry/entry64.S:306

read to 0xffff88810784e3d0 of 1 bytes by task 17869 on cpu 0: kcmrfree+0x121/0x220 net/kcm/kcmsock.c:181 skbreleaseheadstate+0x8e/0x160 net/core/skbuff.c:841 skbreleaseall net/core/skbuff.c:852 [inline] __kfreeskb net/core/skbuff.c:868 [inline] kfreeskb_reason+0x5c/0x260 net/core/skbuff.c:891 kfreeskb include/linux/skbuff.h:1216 [inline] kcmrecvmsg+0x226/0x2b0 net/kcm/kcmsock.c:1161 ____sys_recvmsg+0x16c/0x2e0 ___sysrecvmsg net/socket.c:2743 [inline] dorecvmmsg+0x2f1/0x710 net/socket.c:2837 __sys_recvmmsg net/socket.c:2916 [inline] __dosysrecvmmsg net/socket.c:2939 [inline] __sesysrecvmmsg net/socket.c:2932 [inline] __x64sysrecvmmsg+0xde/0x160 net/socket.c:2932 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x2b/0x70 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17869 Comm: syz-executor.2 Not tainted 6.1.0-rc1-syzkaller-00010-gbb1a1146467a-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022