From 52af6106165bb6521e0dab433e647878a33e901c Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 10 Jun 2014 22:48:56 +0200
Subject: [PATCH] label: when clearing selinux context, don't mangle errno

(cherry picked from commit 874f1947e33922f08c578696af5b628a0f67fec2)
(cherry picked from commit 00d967b989929e176e940345bbf3ffa65832b15f)

Conflicts:
	src/tmpfiles/tmpfiles.c
---
 src/shared/label.c      |  4 ++++
 src/tmpfiles/tmpfiles.c | 13 +++++--------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/src/shared/label.c b/src/shared/label.c
index fde39f2..3a18e31 100644
--- a/src/shared/label.c
+++ b/src/shared/label.c
@@ -230,6 +230,8 @@ int label_socket_set(const char *label) {
 void label_context_clear(void) {
 
 #ifdef HAVE_SELINUX
+        PROTECT_ERRNO;
+
         if (!use_selinux())
                 return;
 
@@ -240,6 +242,8 @@ void label_context_clear(void) {
 void label_socket_clear(void) {
 
 #ifdef HAVE_SELINUX
+        PROTECT_ERRNO;
+
         if (!use_selinux())
                 return;
 
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index 4244656..be2115c 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -460,18 +460,19 @@ static int item_set_perms(Item *i, const char *path) {
 }
 
 static int write_one_file(Item *i, const char *path) {
-        int r, e, fd, flags;
+        int r, fd, flags;
         struct stat st;
 
+        assert(i);
+        assert(path);
+
         flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND :
                 i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC : 0;
 
         RUN_WITH_UMASK(0) {
                 label_context_set(path, S_IFREG);
                 fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, i->mode);
-                e = errno;
                 label_context_clear();
-                errno = e;
         }
 
         if (fd < 0) {
@@ -633,7 +634,7 @@ static int glob_item(Item *i, int (*action)(Item *, const char *)) {
 }
 
 static int create_item(Item *i) {
-        int r, e;
+        int r;
         struct stat st;
 
         assert(i);
@@ -728,9 +729,7 @@ static int create_item(Item *i) {
 
                 label_context_set(i->path, S_IFLNK);
                 r = symlink(i->argument, i->path);
-                e = errno;
                 label_context_clear();
-                errno = e;
 
                 if (r < 0 && errno != EEXIST) {
                         log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
@@ -772,9 +771,7 @@ static int create_item(Item *i) {
                 RUN_WITH_UMASK(0000) {
                         label_context_set(i->path, file_type);
                         r = mknod(i->path, i->mode | file_type, i->major_minor);
-                        e = errno;
                         label_context_clear();
-                        errno = e;
                 }
 
                 if (r < 0 && errno != EEXIST) {