mirror of
https://passt.top/passt
synced 2024-06-27 21:42:42 +00:00
passt: Address gcc 11 warnings
A mix of unchecked return values, a missing permission mask for open(2) with O_CREAT, and some false positives from -Wstringop-overflow and -Wmaybe-uninitialized. Reported-by: Martin Hauke <mardnh@gmx.de> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
parent
087b5f4dbb
commit
1a563a0cbd
14
Makefile
14
Makefile
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@ -15,6 +15,20 @@ CFLAGS += -DPAGE_SIZE=$(shell getconf PAGE_SIZE)
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CFLAGS += -DNETNS_RUN_DIR=\"/run/netns\"
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CFLAGS += -DPASST_AUDIT_ARCH=AUDIT_ARCH_$(shell uname -m | tr [a-z] [A-Z])
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# On gcc 11.2, with -O2 and -flto, tcp_hash() and siphash_20b(), if inlined,
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# seem to be hitting something similar to:
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78993
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# from the pointer arithmetic used from the tcp_tap_handler() path to get the
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# remote connection address.
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ifeq ($(shell $(CC) -dumpversion),11)
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ifneq (,$(filter -flto%,$(CFLAGS)))
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ifneq (,$(filter -O2,$(CFLAGS)))
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CFLAGS += -DTCP_HASH_NOINLINE
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CFLAGS += -DSIPHASH_20B_NOINLINE
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endif
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endif
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endif
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prefix ?= /usr/local
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all: passt pasta passt4netns qrap
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13
passt.c
13
passt.c
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@ -257,13 +257,16 @@ static void pid_file(struct ctx *c) {
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if (!*c->pid_file)
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return;
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pid_fd = open(c->pid_file, O_CREAT | O_WRONLY);
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pid_fd = open(c->pid_file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
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if (pid_fd < 0)
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return;
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n = snprintf(pid_buf, sizeof(pid_buf), "%i\n", getpid());
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write(pid_fd, pid_buf, n);
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if (write(pid_fd, pid_buf, n) < 0) {
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perror("PID file write");
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exit(EXIT_FAILURE);
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}
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close(pid_fd);
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}
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@ -365,8 +368,10 @@ int main(int argc, char **argv)
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else
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__setlogmask(LOG_UPTO(LOG_INFO));
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if (isatty(fileno(stdout)) && !c.foreground)
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daemon(0, 0);
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if (isatty(fileno(stdout)) && !c.foreground && daemon(0, 0)) {
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perror("daemon");
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exit(EXIT_FAILURE);
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}
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pid_file(&c);
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15
pasta.c
15
pasta.c
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@ -184,7 +184,8 @@ void pasta_start_ns(struct ctx *c)
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snprintf(proc_path, PATH_MAX, "/proc/%i/ns/net",
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pasta_child_pid);
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readlink(proc_path, pasta_child_ns, PATH_MAX);
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if (readlink(proc_path, pasta_child_ns, PATH_MAX) < 0)
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warn("Cannot read link to ns, won't clean up on exit");
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return;
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}
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@ -198,20 +199,24 @@ void pasta_start_ns(struct ctx *c)
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snprintf(buf, BUFSIZ, "%u %u %u", 0, euid, 1);
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fd = open("/proc/self/uid_map", O_WRONLY);
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write(fd, buf, strlen(buf));
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if (write(fd, buf, strlen(buf)) < 0)
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warn("Cannot set uid_map in namespace");
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close(fd);
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fd = open("/proc/self/setgroups", O_WRONLY);
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write(fd, "deny", sizeof("deny"));
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if (write(fd, "deny", sizeof("deny")))
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warn("Cannot write to setgroups in namespace");
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close(fd);
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fd = open("/proc/self/gid_map", O_WRONLY);
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write(fd, buf, strlen(buf));
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if (write(fd, buf, strlen(buf)) < 0)
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warn("Cannot set gid_map in namespace");
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close(fd);
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}
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fd = open("/proc/sys/net/ipv4/ping_group_range", O_WRONLY);
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write(fd, "0 0", strlen("0 0"));
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if (write(fd, "0 0", strlen("0 0")) < 0)
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warn("Cannot set ping_group_range, ICMP requests might fail");
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close(fd);
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shell = getenv("SHELL") ? getenv("SHELL") : "/bin/sh";
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35
pcap.c
35
pcap.c
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@ -23,6 +23,7 @@
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include <net/ethernet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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@ -87,8 +88,8 @@ void pcap(char *pkt, size_t len)
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h.tv_usec = tv.tv_usec;
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h.caplen = h.len = len;
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write(pcap_fd, &h, sizeof(h));
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write(pcap_fd, pkt, len);
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if (write(pcap_fd, &h, sizeof(h)) < 0 || write(pcap_fd, pkt, len) < 0)
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debug("Cannot log packet, length %u", len);
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}
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/**
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@ -98,6 +99,7 @@ void pcap(char *pkt, size_t len)
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void pcapm(struct msghdr *mh)
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{
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struct pcap_pkthdr h;
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struct iovec *iov;
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struct timeval tv;
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unsigned int i;
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@ -109,13 +111,19 @@ void pcapm(struct msghdr *mh)
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h.tv_usec = tv.tv_usec;
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for (i = 0; i < mh->msg_iovlen; i++) {
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struct iovec *iov = &mh->msg_iov[i];
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iov = &mh->msg_iov[i];
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h.caplen = h.len = iov->iov_len - 4;
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write(pcap_fd, &h, sizeof(h));
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write(pcap_fd, (char *)iov->iov_base + 4, iov->iov_len - 4);
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if (write(pcap_fd, &h, sizeof(h)) < 0)
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goto fail;
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if (write(pcap_fd, (char *)iov->iov_base + 4, iov->iov_len - 4))
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goto fail;
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}
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return;
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fail:
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debug("Cannot log packet, length %u", iov->iov_len - 4);
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}
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/**
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@ -125,6 +133,7 @@ void pcapm(struct msghdr *mh)
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void pcapmm(struct mmsghdr *mmh, unsigned int vlen)
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{
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struct pcap_pkthdr h;
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struct iovec *iov;
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struct timeval tv;
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unsigned int i, j;
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@ -139,15 +148,20 @@ void pcapmm(struct mmsghdr *mmh, unsigned int vlen)
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struct msghdr *mh = &mmh[i].msg_hdr;
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for (j = 0; j < mh->msg_iovlen; j++) {
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struct iovec *iov = &mh->msg_iov[j];
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iov = &mh->msg_iov[j];
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h.caplen = h.len = iov->iov_len - 4;
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write(pcap_fd, &h, sizeof(h));
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write(pcap_fd, (char *)iov->iov_base + 4,
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iov->iov_len - 4);
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if (write(pcap_fd, &h, sizeof(h)) < 0)
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goto fail;
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if (write(pcap_fd, (char *)iov->iov_base + 4,
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iov->iov_len - 4) < 0)
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goto fail;
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}
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}
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return;
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fail:
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debug("Cannot log packet, length %u", iov->iov_len - 4);
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}
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/**
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@ -194,5 +208,6 @@ void pcap_init(struct ctx *c, int index)
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info("Saving packet capture at %s", c->pcap);
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write(pcap_fd, &pcap_hdr, sizeof(pcap_hdr));
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if (write(pcap_fd, &pcap_hdr, sizeof(pcap_hdr)) < 0)
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warn("Cannot write PCAP header: %s", strerror(errno));
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}
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@ -146,6 +146,9 @@ uint32_t siphash_12b(const uint8_t *in, const uint64_t *k)
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*
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* Return: the 64-bit hash output
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*/
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#if SIPHASH_20B_NOINLINE
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__attribute__((__noinline__)) /* See comment in Makefile */
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#endif
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uint64_t siphash_20b(const uint8_t *in, const uint64_t *k)
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{
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uint32_t *in32 = (uint32_t *)in;
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36
tcp.c
36
tcp.c
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@ -311,6 +311,7 @@
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#include <sched.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits.h>
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#include <net/ethernet.h>
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@ -1103,6 +1104,9 @@ static int tcp_hash_match(struct tcp_tap_conn *conn, int af, void *addr,
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*
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* Return: hash value, already modulo size of the hash table
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*/
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#if TCP_HASH_NOINLINE
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__attribute__((__noinline__)) /* See comment in Makefile */
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#endif
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static unsigned int tcp_hash(struct ctx *c, int af, void *addr,
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in_port_t tap_port, in_port_t sock_port)
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{
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@ -1322,8 +1326,9 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
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for (i = 0; i < mh.msg_iovlen; i++) {
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struct iovec *iov = &mh.msg_iov[i];
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write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4);
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if (write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4) < 0)
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debug("tap write: %s", strerror(errno));
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}
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}
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tcp6_l2_flags_buf_used = 0;
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@ -1338,8 +1343,9 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
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for (i = 0; i < mh.msg_iovlen; i++) {
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struct iovec *iov = &mh.msg_iov[i];
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write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4);
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if (write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4) < 0)
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debug("tap write: %s", strerror(errno));
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}
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}
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tcp4_l2_flags_buf_used = 0;
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@ -1392,8 +1398,9 @@ static void tcp_l2_buf_flush(struct ctx *c)
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for (i = 0; i < mh.msg_iovlen; i++) {
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struct iovec *iov = &mh.msg_iov[i];
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write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4);
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if (write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4) < 0)
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debug("tap write: %s", strerror(errno));
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}
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}
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tcp6_l2_buf_used = tcp6_l2_buf_bytes = 0;
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@ -1413,8 +1420,9 @@ v4:
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for (i = 0; i < mh.msg_iovlen; i++) {
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struct iovec *iov = &mh.msg_iov[i];
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write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4);
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if (write(c->fd_tap, (char *)iov->iov_base + 4,
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iov->iov_len - 4) < 0)
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debug("tap write: %s", strerror(errno));
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}
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}
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tcp4_l2_buf_used = tcp4_l2_buf_bytes = 0;
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@ -1628,14 +1636,16 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
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iov = tcp4_l2_flags_iov_tap + tcp4_l2_flags_buf_used;
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p = b4 = tcp4_l2_flags_buf + tcp4_l2_flags_buf_used++;
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th = &b4->th;
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/* gcc 11.2 would complain on data = (char *)(th + 1); */
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data = b4->opts;
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} else {
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iov = tcp6_l2_flags_iov_tap + tcp6_l2_flags_buf_used;
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p = b6 = tcp6_l2_flags_buf + tcp6_l2_flags_buf_used++;
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th = &b6->th;
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data = b6->opts;
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}
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data = (char *)(th + 1);
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if (flags & SYN) {
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uint16_t mss;
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@ -3538,7 +3548,11 @@ int tcp_sock_init(struct ctx *c, struct timespec *now)
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in_port_t port;
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int i;
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getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret), GRND_RANDOM);
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if (getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret),
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GRND_RANDOM) < 0) {
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perror("TCP initial sequence getrandom");
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exit(EXIT_FAILURE);
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}
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for (port = 0; port < USHRT_MAX; port++) {
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if (!bitmap_isset(c->tcp.port_to_tap, port))
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8
udp.c
8
udp.c
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@ -536,8 +536,8 @@ static void udp_sock_handler_splice(struct ctx *c, union epoll_ref ref,
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uint32_t events, struct timespec *now)
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{
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struct msghdr *mh = &udp_splice_mmh_recv[0].msg_hdr;
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in_port_t src, dst = ref.udp.port, send_dst = 0;
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struct sockaddr_storage *sa_s = mh->msg_name;
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in_port_t src, dst = ref.udp.port, send_dst;
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int s, v6 = ref.udp.v6, n, i;
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if (!(events & EPOLLIN))
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@ -721,7 +721,8 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
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if (c->mode == MODE_PASTA) {
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ip_len += sizeof(struct ethhdr);
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write(c->fd_tap, &b->eh, ip_len);
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if (write(c->fd_tap, &b->eh, ip_len) < 0)
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debug("tap write: %s", strerror(errno));
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pcap((char *)&b->eh, ip_len);
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continue;
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}
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@ -791,7 +792,8 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
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if (c->mode == MODE_PASTA) {
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ip_len += sizeof(struct ethhdr);
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write(c->fd_tap, &b->eh, ip_len);
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if (write(c->fd_tap, &b->eh, ip_len) < 0)
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debug("tap write: %s", strerror(errno));
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pcap((char *)&b->eh, ip_len);
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continue;
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}
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