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From: Sam Hartman <hartmans@debian.org>
Date: Mon, 11 Sep 2023 14:00:42 -0600
Subject: _pam_limits_log_failure
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>
---
modules/pam_limits/pam_limits.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/modules/pam_limits/pam_limits.c b/modules/pam_limits/pam_limits.c
index f7487ba..3bcc48b 100644
--- a/modules/pam_limits/pam_limits.c
+++ b/modules/pam_limits/pam_limits.c
@@ -1270,9 +1270,19 @@ static int setup_limits(pam_handle_t *pamh,
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;
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