Merge "libselinux: use /proc/thread-self when available"

am: 02df2e3082

* commit '02df2e30820051a4b592071946521d5c9f7eb74b':
  libselinux: use /proc/thread-self when available

1 files changed, 26 insertions, 21 deletions

diff --git a/src/procattr.c b/src/procattr.c
index f350808..8569f82 100644
--- a/src/procattr.c
+++ b/src/procattr.c
@@ -15,27 +15,44 @@ static pid_t gettid(void)
 }
 #endif
 
-static int getprocattrcon(char ** context,
-			  pid_t pid, const char *attr)
+static int openattr(pid_t pid, const char *attr, int flags)
 {
-	char *path, *buf;
-	size_t size;
 	int fd, rc;
-	ssize_t ret;
+	char *path;
 	pid_t tid;
-	int errno_hold;
 
 	if (pid > 0)
 		rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr);
 	else {
+		rc = asprintf(&path, "/proc/thread-self/attr/%s", attr);
+		if (rc < 0)
+			return -1;
+		fd = open(path, flags | O_CLOEXEC);
+		if (fd >= 0 || errno != ENOENT)
+			goto out;
+		free(path);
 		tid = gettid();
 		rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr);
 	}
 	if (rc < 0)
 		return -1;
 
-	fd = open(path, O_RDONLY);
+	fd = open(path, flags | O_CLOEXEC);
+out:
 	free(path);
+	return fd;
+}
+
+static int getprocattrcon(char ** context,
+			  pid_t pid, const char *attr)
+{
+	char *buf;
+	size_t size;
+	int fd;
+	ssize_t ret;
+	int errno_hold;
+
+	fd = openattr(pid, attr, O_RDONLY);
 	if (fd < 0)
 		return -1;
 
@@ -76,23 +93,11 @@ static int getprocattrcon(char ** context,
 static int setprocattrcon(const char * context,
 			  pid_t pid, const char *attr)
 {
-	char *path;
-	int fd, rc;
-	pid_t tid;
+	int fd;
 	ssize_t ret;
 	int errno_hold;
 
-	if (pid > 0)
-		rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr);
-	else {
-		tid = gettid();
-		rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr);
-	}
-	if (rc < 0)
-		return -1;
-
-	fd = open(path, O_RDWR);
-	free(path);
+	fd = openattr(pid, attr, O_RDWR);
 	if (fd < 0)
 		return -1;
 	if (context)