100 lines
3.2 KiB
Diff
100 lines
3.2 KiB
Diff
From 3234488f2c52a021eec87df1990d256314c21bff Mon Sep 17 00:00:00 2001
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From: Josef Moellers <jmoellers@suse.de>
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Date: Wed, 14 Apr 2021 16:39:28 +0200
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Subject: [PATCH] pam_limits: "Unlimited" is not a valid value for
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RLIMIT_NOFILE.
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Replace it with a value obtained from /proc/sys/fs/nr_open
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* modules/pam_limits/limits.conf.5.xml: Document the replacement.
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* modules/pam_limits/pam_limits.c: Replace unlimited RLIMIT_NOFILE
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value with a value obtained from /proc/sys/fs/nr_open
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---
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modules/pam_limits/limits.conf.5.xml | 2 ++
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modules/pam_limits/pam_limits.c | 49 ++++++++++++++++++++++++++++
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2 files changed, 51 insertions(+)
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diff --git a/modules/pam_limits/limits.conf.5.xml b/modules/pam_limits/limits.conf.5.xml
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index cd64ac90..c5bd6768 100644
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--- a/modules/pam_limits/limits.conf.5.xml
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+++ b/modules/pam_limits/limits.conf.5.xml
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@@ -283,6 +283,8 @@
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<emphasis>unlimited</emphasis> or <emphasis>infinity</emphasis> indicating no limit,
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except for <emphasis remap='B'>priority</emphasis>, <emphasis remap='B'>nice</emphasis>,
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and <emphasis remap='B'>nonewprivs</emphasis>.
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+ If <emphasis remap='B'>nofile</emphasis> is to be set to one of these values,
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+ it will be set to the contents of /proc/sys/fs/nr_open instead (see setrlimit(3)).
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</para>
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<para>
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If a hard limit or soft limit of a resource is set to a valid value,
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diff --git a/modules/pam_limits/pam_limits.c b/modules/pam_limits/pam_limits.c
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index 10049973..7cc45d77 100644
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--- a/modules/pam_limits/pam_limits.c
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+++ b/modules/pam_limits/pam_limits.c
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@@ -487,6 +487,41 @@ static int init_limits(pam_handle_t *pamh, struct pam_limit_s *pl, int ctrl)
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return retval;
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}
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+/*
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+ * Read the contents of <pathname> and return it in *valuep
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+ * return 1 if conversion succeeds, result is in *valuep
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+ * return 0 if conversion fails, *valuep is untouched.
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+ */
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+static int
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+value_from_file(const char *pathname, rlim_t *valuep)
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+{
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+ char buf[128];
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+ FILE *fp;
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+ int retval;
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+
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+ retval = 0;
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+
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+ if ((fp = fopen(pathname, "r")) != NULL) {
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+ if (fgets(buf, sizeof(buf), fp) != NULL) {
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+ char *endptr;
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+ unsigned long long value;
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+
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+ errno = 0;
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+ value = strtoull(buf, &endptr, 10);
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+ if (endptr != buf &&
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+ (value != ULLONG_MAX || errno == 0) &&
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+ (unsigned long long) (rlim_t) value == value) {
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+ *valuep = (rlim_t) value;
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+ retval = 1;
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+ }
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+ }
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+
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+ fclose(fp);
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+ }
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+
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+ return retval;
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+}
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+
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static void
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process_limit (const pam_handle_t *pamh, int source, const char *lim_type,
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const char *lim_item, const char *lim_value,
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@@ -666,6 +701,20 @@ process_limit (const pam_handle_t *pamh, int source, const char *lim_type,
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rlimit_value = 20 - int_value;
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break;
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#endif
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+ case RLIMIT_NOFILE:
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+ /*
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+ * If nofile is to be set to "unlimited", try to set it to
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+ * the value in /proc/sys/fs/nr_open instead.
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+ */
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+ if (rlimit_value == RLIM_INFINITY) {
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+ if (!value_from_file("/proc/sys/fs/nr_open", &rlimit_value))
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+ pam_syslog(pamh, LOG_WARNING,
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+ "Cannot set \"nofile\" to a sensible value");
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+ else if (ctrl & PAM_DEBUG_ARG)
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+ pam_syslog(pamh, LOG_DEBUG, "Setting \"nofile\" limit to %llu",
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+ (unsigned long long) rlimit_value);
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+ }
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+ break;
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}
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if ( (limit_item != LIMIT_LOGIN)
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--
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2.33.1
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