From 046c93f8dbcdcebc0592cb489f7bb9ede067554b Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Mon, 2 Nov 2015 23:05:44 -0800 Subject: sd-daemon: fix potential LISTEN_FDS overflow in sd_listen_fds() --- src/libsystemd/sd-daemon/sd-daemon.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) (limited to 'src/libsystemd/sd-daemon/sd-daemon.c') diff --git a/src/libsystemd/sd-daemon/sd-daemon.c b/src/libsystemd/sd-daemon/sd-daemon.c index 27045e25d0..f0d5d00b2e 100644 --- a/src/libsystemd/sd-daemon/sd-daemon.c +++ b/src/libsystemd/sd-daemon/sd-daemon.c @@ -58,8 +58,7 @@ static void unsetenv_all(bool unset_environment) { _public_ int sd_listen_fds(int unset_environment) { const char *e; - unsigned n; - int r, fd; + int n, r, fd; pid_t pid; e = getenv("LISTEN_PID"); @@ -84,17 +83,23 @@ _public_ int sd_listen_fds(int unset_environment) { goto finish; } - r = safe_atou(e, &n); + r = safe_atoi(e, &n); if (r < 0) goto finish; - for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) n; fd ++) { + assert_cc(SD_LISTEN_FDS_START < INT_MAX); + if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START) { + r = -EINVAL; + goto finish; + } + + for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) { r = fd_cloexec(fd, true); if (r < 0) goto finish; } - r = (int) n; + r = n; finish: unsetenv_all(unset_environment); -- cgit v1.2.3-54-g00ecf