diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-3566.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-3566.patch | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-3566.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-3566.patch new file mode 100644 index 000000000..a7d91c7c2 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-3566.patch @@ -0,0 +1,127 @@ +From f49cd2f4d6170d27a2c61f1fecb03d8a70c91f57 Mon Sep 17 00:00:00 2001 +From: Kuniyuki Iwashima <kuniyu@amazon.com> +Date: Thu, 6 Oct 2022 11:53:49 -0700 +Subject: tcp: Fix data races around icsk->icsk_af_ops. + +setsockopt(IPV6_ADDRFORM) and tcp_v6_connect() change icsk->icsk_af_ops +under lock_sock(), but tcp_(get|set)sockopt() read it locklessly. To +avoid load/store tearing, we need to add READ_ONCE() and WRITE_ONCE() +for the reads and writes. + +Thanks to Eric Dumazet for providing the syzbot report: + +BUG: KCSAN: data-race in tcp_setsockopt / tcp_v6_connect + +write to 0xffff88813c624518 of 8 bytes by task 23936 on cpu 0: +tcp_v6_connect+0x5b3/0xce0 net/ipv6/tcp_ipv6.c:240 +__inet_stream_connect+0x159/0x6d0 net/ipv4/af_inet.c:660 +inet_stream_connect+0x44/0x70 net/ipv4/af_inet.c:724 +__sys_connect_file net/socket.c:1976 [inline] +__sys_connect+0x197/0x1b0 net/socket.c:1993 +__do_sys_connect net/socket.c:2003 [inline] +__se_sys_connect net/socket.c:2000 [inline] +__x64_sys_connect+0x3d/0x50 net/socket.c:2000 +do_syscall_x64 arch/x86/entry/common.c:50 [inline] +do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 +entry_SYSCALL_64_after_hwframe+0x63/0xcd + +read to 0xffff88813c624518 of 8 bytes by task 23937 on cpu 1: +tcp_setsockopt+0x147/0x1c80 net/ipv4/tcp.c:3789 +sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3585 +__sys_setsockopt+0x212/0x2b0 net/socket.c:2252 +__do_sys_setsockopt net/socket.c:2263 [inline] +__se_sys_setsockopt net/socket.c:2260 [inline] +__x64_sys_setsockopt+0x62/0x70 net/socket.c:2260 +do_syscall_x64 arch/x86/entry/common.c:50 [inline] +do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 +entry_SYSCALL_64_after_hwframe+0x63/0xcd + +value changed: 0xffffffff8539af68 -> 0xffffffff8539aff8 + +Reported by Kernel Concurrency Sanitizer on: +CPU: 1 PID: 23937 Comm: syz-executor.5 Not tainted +6.0.0-rc4-syzkaller-00331-g4ed9c1e971b1-dirty #0 + +Hardware name: Google Google Compute Engine/Google Compute Engine, +BIOS Google 08/26/2022 + +Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") +Reported-by: syzbot <syzkaller@googlegroups.com> +Reported-by: Eric Dumazet <edumazet@google.com> +Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> +Signed-off-by: Jakub Kicinski <kuba@kernel.org> +--- + net/ipv4/tcp.c | 10 ++++++---- + net/ipv6/ipv6_sockglue.c | 3 ++- + net/ipv6/tcp_ipv6.c | 6 ++++-- + 3 files changed, 12 insertions(+), 7 deletions(-) + +diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c +index f5c336f8b0c8..c86d27d653be 100644 +--- a/net/ipv4/tcp.c ++++ b/net/ipv4/tcp.c +@@ -3652,8 +3652,9 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, + const struct inet_connection_sock *icsk = inet_csk(sk); + + if (level != SOL_TCP) +- return icsk->icsk_af_ops->setsockopt(sk, level, optname, +- optval, optlen); ++ /* Paired with WRITE_ONCE() in do_ipv6_setsockopt() and tcp_v6_connect() */ ++ return READ_ONCE(icsk->icsk_af_ops)->setsockopt(sk, level, optname, ++ optval, optlen); + return do_tcp_setsockopt(sk, level, optname, optval, optlen); + } + EXPORT_SYMBOL(tcp_setsockopt); +@@ -4248,8 +4249,9 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, + struct inet_connection_sock *icsk = inet_csk(sk); + + if (level != SOL_TCP) +- return icsk->icsk_af_ops->getsockopt(sk, level, optname, +- optval, optlen); ++ /* Paired with WRITE_ONCE() in do_ipv6_setsockopt() and tcp_v6_connect() */ ++ return READ_ONCE(icsk->icsk_af_ops)->getsockopt(sk, level, optname, ++ optval, optlen); + return do_tcp_getsockopt(sk, level, optname, optval, optlen); + } + EXPORT_SYMBOL(tcp_getsockopt); +diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c +index e4bdb09c5586..cd4fd98fb68e 100644 +--- a/net/ipv6/ipv6_sockglue.c ++++ b/net/ipv6/ipv6_sockglue.c +@@ -474,7 +474,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, + sock_prot_inuse_add(net, &tcp_prot, 1); + local_bh_enable(); + sk->sk_prot = &tcp_prot; +- icsk->icsk_af_ops = &ipv4_specific; ++ /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ ++ WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific); + sk->sk_socket->ops = &inet_stream_ops; + sk->sk_family = PF_INET; + tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); +diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c +index b03dd02c9f13..7844f4dfbee1 100644 +--- a/net/ipv6/tcp_ipv6.c ++++ b/net/ipv6/tcp_ipv6.c +@@ -237,7 +237,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, + sin.sin_port = usin->sin6_port; + sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; + +- icsk->icsk_af_ops = &ipv6_mapped; ++ /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ ++ WRITE_ONCE(icsk->icsk_af_ops, &ipv6_mapped); + if (sk_is_mptcp(sk)) + mptcpv6_handle_mapped(sk, true); + sk->sk_backlog_rcv = tcp_v4_do_rcv; +@@ -249,7 +250,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, + + if (err) { + icsk->icsk_ext_hdr_len = exthdrlen; +- icsk->icsk_af_ops = &ipv6_specific; ++ /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */ ++ WRITE_ONCE(icsk->icsk_af_ops, &ipv6_specific); + if (sk_is_mptcp(sk)) + mptcpv6_handle_mapped(sk, false); + sk->sk_backlog_rcv = tcp_v6_do_rcv; +-- +2.34.1 + |