nss: only read logging config from environment variables

log_parse_environment() uses should_parse_proc_cmdline() to determine whether
it should parse settings from the kernel command line. But the checks that
should_parse_proc_cmdline() apply to the whole process, and we could get a positive
answer also when log_parse_environment() was called from one of the nss modules.
In case of nss-modules, we don't want to look at the kernel command line.

log_parse_environment_variables() that only looks at the environment variables
is split out and used in the nss modules.

Fixes #22020.

(cherry picked from commit a7d15a24659770b0fa9f4cd26fc7bbb17765cbb7)

5 files changed, 14 insertions, 9 deletions

diff --git a/src/basic/log.c b/src/basic/log.c
index fb183ea9e7..1d68b49963 100644
--- a/src/basic/log.c
+++ b/src/basic/log.c
@@ -1189,14 +1189,9 @@ static bool should_parse_proc_cmdline(void) {
         return getpid_cached() == p;
 }
 
-void log_parse_environment(void) {
+void log_parse_environment_variables(void) {
         const char *e;
 
-        /* Do not call from library code. */
-
-        if (should_parse_proc_cmdline())
-                (void) proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
-
         e = getenv("SYSTEMD_LOG_TARGET");
         if (e && log_set_target_from_string(e) < 0)
                 log_warning("Failed to parse log target '%s'. Ignoring.", e);
@@ -1222,6 +1217,15 @@ void log_parse_environment(void) {
                 log_warning("Failed to parse log tid '%s'. Ignoring.", e);
 }
 
+void log_parse_environment(void) {
+        /* Do not call from library code. */
+
+        if (should_parse_proc_cmdline())
+                (void) proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
+
+        log_parse_environment_variables();
+}
+
 LogTarget log_get_target(void) {
         return log_target;
 }
diff --git a/src/basic/log.h b/src/basic/log.h
index 8bfae8e0e5..3dbd01a75d 100644
--- a/src/basic/log.h
+++ b/src/basic/log.h
@@ -69,6 +69,7 @@ int log_open(void);
 void log_close(void);
 void log_forget_fds(void);
 
+void log_parse_environment_variables(void);
 void log_parse_environment(void);
 
 int log_dispatch_internal(
diff --git a/src/nss-mymachines/nss-mymachines.c b/src/nss-mymachines/nss-mymachines.c
index 781fd48d72..c64e79bdff 100644
--- a/src/nss-mymachines/nss-mymachines.c
+++ b/src/nss-mymachines/nss-mymachines.c
@@ -24,7 +24,7 @@
 
 static void setup_logging_once(void) {
         static pthread_once_t once = PTHREAD_ONCE_INIT;
-        assert_se(pthread_once(&once, log_parse_environment) == 0);
+        assert_se(pthread_once(&once, log_parse_environment_variables) == 0);
 }
 
 #define NSS_ENTRYPOINT_BEGIN                    \
diff --git a/src/nss-resolve/nss-resolve.c b/src/nss-resolve/nss-resolve.c
index 4f54973202..dd2e5206e2 100644
--- a/src/nss-resolve/nss-resolve.c
+++ b/src/nss-resolve/nss-resolve.c
@@ -22,7 +22,7 @@
 static JsonDispatchFlags json_dispatch_flags = 0;
 
 static void setup_logging(void) {
-        log_parse_environment();
+        log_parse_environment_variables();
 
         if (DEBUG_LOGGING)
                 json_dispatch_flags = JSON_LOG;
diff --git a/src/nss-systemd/nss-systemd.c b/src/nss-systemd/nss-systemd.c
index c6c00c40e6..e87f1d31b3 100644
--- a/src/nss-systemd/nss-systemd.c
+++ b/src/nss-systemd/nss-systemd.c
@@ -118,7 +118,7 @@ static GetentData getsgent_data = {
 
 static void setup_logging_once(void) {
         static pthread_once_t once = PTHREAD_ONCE_INIT;
-        assert_se(pthread_once(&once, log_parse_environment) == 0);
+        assert_se(pthread_once(&once, log_parse_environment_variables) == 0);
 }
 
 #define NSS_ENTRYPOINT_BEGIN                    \