diff options
Diffstat (limited to 'util/qemu-sockets.c')
| -rw-r--r-- | util/qemu-sockets.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index a76bb3c913..cf4b91f7f5 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -694,7 +694,7 @@ int unix_listen_opts(QemuOpts *opts, Error **errp) sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); if (sock < 0) { - error_setg_errno(errp, errno, "Failed to create socket"); + error_setg_errno(errp, errno, "Failed to create Unix socket"); return -1; } @@ -703,9 +703,15 @@ int unix_listen_opts(QemuOpts *opts, Error **errp) if (path && strlen(path)) { snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); } else { - char *tmpdir = getenv("TMPDIR"); - snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX", - tmpdir ? tmpdir : "/tmp"); + const char *tmpdir = getenv("TMPDIR"); + tmpdir = tmpdir ? tmpdir : "/tmp"; + if (snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX", + tmpdir) >= sizeof(un.sun_path)) { + error_setg_errno(errp, errno, + "TMPDIR environment variable (%s) too large", tmpdir); + goto err; + } + /* * This dummy fd usage silences the mktemp() unsecure warning. * Using mkstemp() doesn't make things more secure here @@ -713,13 +719,19 @@ int unix_listen_opts(QemuOpts *opts, Error **errp) * to unlink first and thus re-open the race window. The * worst case possible is bind() failing, i.e. a DoS attack. */ - fd = mkstemp(un.sun_path); close(fd); + fd = mkstemp(un.sun_path); + if (fd < 0) { + error_setg_errno(errp, errno, + "Failed to make a temporary socket name in %s", tmpdir); + goto err; + } + close(fd); qemu_opt_set(opts, "path", un.sun_path); } unlink(un.sun_path); if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { - error_setg_errno(errp, errno, "Failed to bind socket"); + error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path); goto err; } if (listen(sock, 1) < 0) { |