No need for the explicit fcntl() call, request the behaviour when opening the descriptor. One fcntl() call setting FD_CLOEXEC remains in extensions/libxt_bpf.c, the indirect syscall seems not to support passing the flag directly. Reported-by: Gaurav Gupta <g.gupta@xxxxxxxxxxx> Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1104 Signed-off-by: Phil Sutter <phil@xxxxxx> --- extensions/libxt_set.h | 8 +------- libiptc/libiptc.c | 8 +------- libxtables/xtables.c | 15 ++------------- 3 files changed, 4 insertions(+), 27 deletions(-) diff --git a/extensions/libxt_set.h b/extensions/libxt_set.h index 597bf7ebe575a..685bfab955597 100644 --- a/extensions/libxt_set.h +++ b/extensions/libxt_set.h @@ -10,7 +10,7 @@ static int get_version(unsigned *version) { - int res, sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); + int res, sockfd = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW); struct ip_set_req_version req_version; socklen_t size = sizeof(req_version); @@ -18,12 +18,6 @@ get_version(unsigned *version) xtables_error(OTHER_PROBLEM, "Can't open socket to ipset.\n"); - if (fcntl(sockfd, F_SETFD, FD_CLOEXEC) == -1) { - xtables_error(OTHER_PROBLEM, - "Could not set close on exec: %s\n", - strerror(errno)); - } - req_version.op = IP_SET_OP_VERSION; res = getsockopt(sockfd, SOL_IP, SO_IP_SET, &req_version, &size); if (res != 0) diff --git a/libiptc/libiptc.c b/libiptc/libiptc.c index 29ff356f2324e..e475063367c26 100644 --- a/libiptc/libiptc.c +++ b/libiptc/libiptc.c @@ -1318,16 +1318,10 @@ TC_INIT(const char *tablename) return NULL; } - sockfd = socket(TC_AF, SOCK_RAW, IPPROTO_RAW); + sockfd = socket(TC_AF, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW); if (sockfd < 0) return NULL; - if (fcntl(sockfd, F_SETFD, FD_CLOEXEC) == -1) { - fprintf(stderr, "Could not set close on exec: %s\n", - strerror(errno)); - abort(); - } - s = sizeof(info); strcpy(info.name, tablename); diff --git a/libxtables/xtables.c b/libxtables/xtables.c index e3e444acbbaa2..ba9ceaeb3da41 100644 --- a/libxtables/xtables.c +++ b/libxtables/xtables.c @@ -481,14 +481,9 @@ static char *get_modprobe(void) char *ret; int count; - procfile = open(PROC_SYS_MODPROBE, O_RDONLY); + procfile = open(PROC_SYS_MODPROBE, O_RDONLY | O_CLOEXEC); if (procfile < 0) return NULL; - if (fcntl(procfile, F_SETFD, FD_CLOEXEC) == -1) { - fprintf(stderr, "Could not set close on exec: %s\n", - strerror(errno)); - exit(1); - } ret = malloc(PATH_MAX); if (ret) { @@ -1023,7 +1018,7 @@ int xtables_compatible_revision(const char *name, uint8_t revision, int opt) socklen_t s = sizeof(rev); int max_rev, sockfd; - sockfd = socket(afinfo->family, SOCK_RAW, IPPROTO_RAW); + sockfd = socket(afinfo->family, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW); if (sockfd < 0) { if (errno == EPERM) { /* revision 0 is always supported. */ @@ -1039,12 +1034,6 @@ int xtables_compatible_revision(const char *name, uint8_t revision, int opt) exit(1); } - if (fcntl(sockfd, F_SETFD, FD_CLOEXEC) == -1) { - fprintf(stderr, "Could not set close on exec: %s\n", - strerror(errno)); - exit(1); - } - xtables_load_ko(xtables_modprobe_program, true); strncpy(rev.name, name, XT_EXTENSION_MAXNAMELEN - 1); -- 2.40.0
