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Kuniyuki Iwashima dfd9248c07 net: Fix load-tearing on sk->sk_stamp in sock_recv_cmsgs(). 
KCSAN found a data race in sock_recv_cmsgs() where the read access
to sk->sk_stamp needs READ_ONCE().

BUG: KCSAN: data-race in packet_recvmsg / packet_recvmsg

write (marked) to 0xffff88803c81f258 of 8 bytes by task 19171 on cpu 0:
 sock_write_timestamp include/net/sock.h:2670 [inline]
 sock_recv_cmsgs include/net/sock.h:2722 [inline]
 packet_recvmsg+0xb97/0xd00 net/packet/af_packet.c:3489
 sock_recvmsg_nosec net/socket.c:1019 [inline]
 sock_recvmsg+0x11a/0x130 net/socket.c:1040
 sock_read_iter+0x176/0x220 net/socket.c:1118
 call_read_iter include/linux/fs.h:1845 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x5e0/0x630 fs/read_write.c:470
 ksys_read+0x163/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x41/0x50 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

read to 0xffff88803c81f258 of 8 bytes by task 19183 on cpu 1:
 sock_recv_cmsgs include/net/sock.h:2721 [inline]
 packet_recvmsg+0xb64/0xd00 net/packet/af_packet.c:3489
 sock_recvmsg_nosec net/socket.c:1019 [inline]
 sock_recvmsg+0x11a/0x130 net/socket.c:1040
 sock_read_iter+0x176/0x220 net/socket.c:1118
 call_read_iter include/linux/fs.h:1845 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x5e0/0x630 fs/read_write.c:470
 ksys_read+0x163/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x41/0x50 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

value changed: 0xffffffffc4653600 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19183 Comm: syz-executor.5 Not tainted 6.3.0-rc7-02330-gca6270c12e20 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014

Fixes: 6c7c98bad4 ("sock: avoid dirtying sk_stamp, if possible")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230508175543.55756-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2023-05-09 20:09:49 -07:00
..
acpi Power management updates for 6.4-rc1 2023-04-25 18:44:10 -07:00
asm-generic Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
clocksource KVM: arm64: timers: Use CNTPOFF_EL2 to offset the physical timer 2023-03-30 19:01:09 +01:00
crypto This update includes the following changes: 2023-04-26 08:32:52 -07:00
drm - Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of 2023-04-27 19:42:02 -07:00
dt-bindings linux-watchdog 6.4-rc1 tag 2023-05-04 18:33:56 -07:00
keys
…
kunit kunit: increase KUNIT_LOG_SIZE to 2048 bytes 2023-03-29 18:55:41 -06:00
kvm s390: 2023-05-01 12:06:20 -07:00
linux linux/dim: Do nothing if no time delta between samples 2023-05-09 11:06:45 +02:00
math-emu
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media media: i2c: Drop unused sr030pc30 camera sensor driver 2023-04-15 09:56:49 +01:00
memory
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misc
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net net: Fix load-tearing on sk->sk_stamp in sock_recv_cmsgs(). 2023-05-09 20:09:49 -07:00
pcmcia
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ras
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rdma RDMA: Add ib_virt_dma_to_page() 2023-04-16 11:08:07 +03:00
rv
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scsi Driver core changes for 6.4-rc1 2023-04-27 11:53:57 -07:00
soc Nothing looks out of the ordinary in this batch of clk driver updates. There 2023-04-29 17:29:39 -07:00
sound ASoC: Updates for v6.4 2023-04-24 15:15:31 +02:00
target
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trace NFSD 6.4 Release Notes 2023-04-29 11:04:14 -07:00
uapi dmaengine updates for v6.4 2023-05-03 11:11:56 -07:00
ufs SCSI misc on 20230426 2023-04-26 15:39:25 -07:00
vdso
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video
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xen
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