diff options
| author | Eric Dumazet <edumazet@google.com> | 2021-10-26 14:30:14 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-10-27 18:20:21 -0700 |
| commit | 9dfc685e0262d4c5e44e13302f89841fa75173ca (patch) | |
| tree | b716e98f2f7a26e6104749addaba28b34bb2680d /net/ipv6 | |
| parent | b859a360d88d5ad239d46978c78fe2b63dd9efe5 (diff) | |
inet: remove races in inet{6}_getname()
syzbot reported data-races in inet_getname() multiple times,
it is time we fix this instead of pretending applications
should not trigger them.
getsockname() and getpeername() are not really considered fast path.
v2: added the missing BPF_CGROUP_RUN_SA_PROG() declaration
needed when CONFIG_CGROUP_BPF=n, as reported by
kernel test robot <lkp@intel.com>
syzbot typical report:
BUG: KCSAN: data-race in __inet_hash_connect / inet_getname
write to 0xffff888136d66cf8 of 2 bytes by task 14374 on cpu 1:
__inet_hash_connect+0x7ec/0x950 net/ipv4/inet_hashtables.c:831
inet_hash_connect+0x85/0x90 net/ipv4/inet_hashtables.c:853
tcp_v4_connect+0x782/0xbb0 net/ipv4/tcp_ipv4.c:275
__inet_stream_connect+0x156/0x6e0 net/ipv4/af_inet.c:664
inet_stream_connect+0x44/0x70 net/ipv4/af_inet.c:728
__sys_connect_file net/socket.c:1896 [inline]
__sys_connect+0x254/0x290 net/socket.c:1913
__do_sys_connect net/socket.c:1923 [inline]
__se_sys_connect net/socket.c:1920 [inline]
__x64_sys_connect+0x3d/0x50 net/socket.c:1920
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
read to 0xffff888136d66cf8 of 2 bytes by task 14408 on cpu 0:
inet_getname+0x11f/0x170 net/ipv4/af_inet.c:790
__sys_getsockname+0x11d/0x1b0 net/socket.c:1946
__do_sys_getsockname net/socket.c:1961 [inline]
__se_sys_getsockname net/socket.c:1958 [inline]
__x64_sys_getsockname+0x3e/0x50 net/socket.c:1958
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
value changed: 0x0000 -> 0xdee0
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14408 Comm: syz-executor.3 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Link: https://lore.kernel.org/r/20211026213014.3026708-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/af_inet6.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index b5878bb8e419..0c4da163535a 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -521,31 +521,32 @@ int inet6_getname(struct socket *sock, struct sockaddr *uaddr, sin->sin6_family = AF_INET6; sin->sin6_flowinfo = 0; sin->sin6_scope_id = 0; + lock_sock(sk); if (peer) { - if (!inet->inet_dport) - return -ENOTCONN; - if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && - peer == 1) + if (!inet->inet_dport || + (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && + peer == 1)) { + release_sock(sk); return -ENOTCONN; + } sin->sin6_port = inet->inet_dport; sin->sin6_addr = sk->sk_v6_daddr; if (np->sndflow) sin->sin6_flowinfo = np->flow_label; - BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, - CGROUP_INET6_GETPEERNAME, - NULL); + BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, + CGROUP_INET6_GETPEERNAME); } else { if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) sin->sin6_addr = np->saddr; else sin->sin6_addr = sk->sk_v6_rcv_saddr; sin->sin6_port = inet->inet_sport; - BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, - CGROUP_INET6_GETSOCKNAME, - NULL); + BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, + CGROUP_INET6_GETSOCKNAME); } sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, sk->sk_bound_dev_if); + release_sock(sk); return sizeof(*sin); } EXPORT_SYMBOL(inet6_getname); |