File: 040_pam_limits_log_failure

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Patch for Debian bug #180310

Generate some (low-severity) log information whenever setrlimit() fails,
for debugging purposes.

Authors: Sam Hartman <hartmans@debian.org>

Upstream status: submitted in <20070830171918.GB30563@dario.dodds.net>

Index: pam.deb/modules/pam_limits/pam_limits.c
===================================================================
--- pam.deb.orig/modules/pam_limits/pam_limits.c
+++ pam.deb/modules/pam_limits/pam_limits.c
@@ -732,9 +732,19 @@
         if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max)
             pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max;
 	res = setrlimit(i, &pl->limits[i].limit);
-	if (res != 0)
-	  pam_syslog(pamh, LOG_ERR, "Could not set limit for '%s': %m",
-		     rlimit2str(i));
+	if (res != 0 && (i != RLIMIT_NOFILE
+	                    || pl->limits[i].limit.rlim_cur != RLIM_INFINITY))
+	{
+		int save_errno = errno;
+		pam_syslog(pamh, LOG_DEBUG,
+		           "Could not set limit for '%s' to soft=%d, hard=%d:"
+		           " %m; uid=%lu,euid=%lu", rlimit2str(i),
+		           pl->limits[i].limit.rlim_cur,
+		           pl->limits[i].limit.rlim_max,
+		           (unsigned long) getuid(),
+		           (unsigned long) geteuid());
+		errno = save_errno;
+	}
 	if (res == -1 && errno == EPERM)
 	    continue;
 	status |= res;