diff options
Diffstat (limited to 'modules/pam_xauth/pam_xauth.c')
| -rw-r--r-- | modules/pam_xauth/pam_xauth.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/modules/pam_xauth/pam_xauth.c b/modules/pam_xauth/pam_xauth.c index c7ce55ab..2be43513 100644 --- a/modules/pam_xauth/pam_xauth.c +++ b/modules/pam_xauth/pam_xauth.c @@ -128,7 +128,6 @@ run_coprocess(pam_handle_t *pamh, const char *input, char **output, /* We're the child. */ size_t j; const char *args[10]; - int maxopened; /* Drop privileges. */ if (setgid(gid) == -1) { @@ -150,19 +149,26 @@ run_coprocess(pam_handle_t *pamh, const char *input, char **output, (unsigned long) geteuid ()); _exit (err); } - /* Initialize the argument list. */ - memset(args, 0, sizeof(args)); /* Set the pipe descriptors up as stdin and stdout, and close * everything else, including the original values for the * descriptors. */ - dup2(ipipe[0], STDIN_FILENO); - dup2(opipe[1], STDOUT_FILENO); - maxopened = (int)sysconf(_SC_OPEN_MAX); - for (i = 0; i < maxopened; i++) { - if ((i != STDIN_FILENO) && (i != STDOUT_FILENO)) { - close(i); - } + if (dup2(ipipe[0], STDIN_FILENO) != STDIN_FILENO) { + int err = errno; + pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", "stdin"); + _exit(err); } + if (dup2(opipe[1], STDOUT_FILENO) != STDOUT_FILENO) { + int err = errno; + pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", "stdout"); + _exit(err); + } + if (pam_modutil_sanitize_helper_fds(pamh, PAM_MODUTIL_IGNORE_FD, + PAM_MODUTIL_IGNORE_FD, + PAM_MODUTIL_NULL_FD) < 0) { + _exit(1); + } + /* Initialize the argument list. */ + memset(args, 0, sizeof(args)); /* Convert the varargs list into a regular array of strings. */ va_start(ap, command); args[0] = command; |