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authorDaniel Borkmann <daniel@iogearbox.net>2018-08-16 21:49:06 +0200
committerAlexei Starovoitov <ast@kernel.org>2018-08-16 23:58:07 +0200
commit037b0b86ecf5646f8eae777d8b52ff8b401692ec (patch)
tree26a129f4af93fd475c7fd2374e066f953b0d1bf4 /net/ipv4/tcp_ulp.c
parentbpf: fix a rcu usage warning in bpf_prog_array_copy_core() (diff)
downloadlinux-037b0b86ecf5646f8eae777d8b52ff8b401692ec.tar.xz
linux-037b0b86ecf5646f8eae777d8b52ff8b401692ec.zip
tcp, ulp: add alias for all ulp modules
Lets not turn the TCP ULP lookup into an arbitrary module loader as we only intend to load ULP modules through this mechanism, not other unrelated kernel modules: [root@bar]# cat foo.c #include <sys/types.h> #include <sys/socket.h> #include <linux/tcp.h> #include <linux/in.h> int main(void) { int sock = socket(PF_INET, SOCK_STREAM, 0); setsockopt(sock, IPPROTO_TCP, TCP_ULP, "sctp", sizeof("sctp")); return 0; } [root@bar]# gcc foo.c -O2 -Wall [root@bar]# lsmod | grep sctp [root@bar]# ./a.out [root@bar]# lsmod | grep sctp sctp 1077248 4 libcrc32c 16384 3 nf_conntrack,nf_nat,sctp [root@bar]# Fix it by adding module alias to TCP ULP modules, so probing module via request_module() will be limited to tcp-ulp-[name]. The existing modules like kTLS will load fine given tcp-ulp-tls alias, but others will fail to load: [root@bar]# lsmod | grep sctp [root@bar]# ./a.out [root@bar]# lsmod | grep sctp [root@bar]# Sockmap is not affected from this since it's either built-in or not. Fixes: 734942cc4ea6 ("tcp: ULP infrastructure") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/ipv4/tcp_ulp.c')
-rw-r--r--net/ipv4/tcp_ulp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 622caa4039e0..7dd44b6156c7 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -51,7 +51,7 @@ static const struct tcp_ulp_ops *__tcp_ulp_find_autoload(const char *name)
#ifdef CONFIG_MODULES
if (!ulp && capable(CAP_NET_ADMIN)) {
rcu_read_unlock();
- request_module("%s", name);
+ request_module("tcp-ulp-%s", name);
rcu_read_lock();
ulp = tcp_ulp_find(name);
}