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| author | Alyssa Ross <hi@alyssa.is> | 2022-02-20 12:37:55 +0000 |
|---|---|---|
| committer | Alyssa Ross <hi@alyssa.is> | 2022-02-20 12:40:44 +0000 |
| commit | 3c461d5d189b2637e76223c21c7501aaf7085f0a (patch) | |
| tree | f62f82533fc06ec5bbf78f122290d974cfe341f5 /host | |
| parent | 0f81f151e66b32529e38d3a505d13d02103a015f (diff) | |
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host/start-vm: tap_open: check name length
Diffstat (limited to 'host')
| -rw-r--r-- | host/start-vm/net-util.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/host/start-vm/net-util.c b/host/start-vm/net-util.c index 1303762..cc6b950 100644 --- a/host/start-vm/net-util.c +++ b/host/start-vm/net-util.c @@ -2,6 +2,7 @@ // SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is> #include <err.h> +#include <errno.h> #include <fcntl.h> #include <net/if.h> #include <string.h> @@ -130,11 +131,16 @@ int tap_open(const char *name, int flags) struct ifreq ifr; int fd; - if ((fd = open("/dev/net/tun", O_RDWR)) == -1) - return -1; - strncpy(ifr.ifr_name, name, IFNAMSIZ); ifr.ifr_flags = IFF_TAP|flags; + + if (ifr.ifr_name[IFNAMSIZ - 1]) { + errno = ENAMETOOLONG; + return -1; + } + + if ((fd = open("/dev/net/tun", O_RDWR)) == -1) + return -1; if (!ioctl(fd, TUNSETIFF, &ifr)) return fd; |