Re: [PATCH 6/6] tap, tcp, util: Add some missing SOCK_CLOEXEC flags

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Nov 07, 2024 at 07:43:31PM +0100, Stefano Brivio wrote:
> I have no idea why, but these are reported by clang-tidy (19.2.1) on
> Alpine (x86) only:
> 
> /home/sbrivio/passt/tap.c:1139:38: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
>  1139 |         int fd = socket(AF_UNIX, SOCK_STREAM, 0);
>       |                                             ^
>       |                                              | SOCK_CLOEXEC
> /home/sbrivio/passt/tap.c:1158:51: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
>  1158 |                 ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
>       |                                                                 ^
>       |                                                                  | SOCK_CLOEXEC
> /home/sbrivio/passt/tcp.c:1413:44: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
>  1413 |         s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);
>       |                                                   ^
>       |                                                    | SOCK_CLOEXEC
> /home/sbrivio/passt/util.c:188:38: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
>   188 |         if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
>       |                                             ^
>       |                                              | SOCK_CLOEXEC
> 
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  tap.c  | 5 +++--
>  tcp.c  | 2 +-
>  util.c | 3 ++-
>  3 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/tap.c b/tap.c
> index a3ba958..14d9b3d 100644
> --- a/tap.c
> +++ b/tap.c
> @@ -1136,7 +1136,7 @@ void tap_handler_pasta(struct ctx *c, uint32_t events,
>   */
>  int tap_sock_unix_open(char *sock_path)
>  {
> -	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
> +	int fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
>  	struct sockaddr_un addr = {
>  		.sun_family = AF_UNIX,
>  	};
> @@ -1155,7 +1155,8 @@ int tap_sock_unix_open(char *sock_path)
>  					UNIX_SOCK_PATH, i))
>  			die_perror("Can't build UNIX domain socket path");
>  
> -		ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
> +		ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
> +			    0);
>  		if (ex < 0)
>  			die_perror("Failed to check for UNIX domain conflicts");
>  
> diff --git a/tcp.c b/tcp.c
> index a3d48fa..6a98dfa 100644
> --- a/tcp.c
> +++ b/tcp.c
> @@ -1410,7 +1410,7 @@ static int tcp_conn_new_sock(const struct ctx *c, sa_family_t af)
>  {
>  	int s;
>  
> -	s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);
> +	s = socket(af, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP);
>  
>  	if (s > FD_REF_MAX) {
>  		close(s);
> diff --git a/util.c b/util.c
> index dddef93..3448f30 100644
> --- a/util.c
> +++ b/util.c
> @@ -183,7 +183,8 @@ void sock_probe_mem(struct ctx *c)
>  	int v = INT_MAX / 2, s;
>  	socklen_t sl;
>  
> -	if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
> +	s = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
> +	if (s < 0) {
>  		c->low_wmem = c->low_rmem = 1;
>  		return;
>  	}

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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