Linux 3.16 introduced a /proc/thread-self symlink that can be used to reference the proc files of the current thread without needing to use gettid(2). Use this symlink when it exists, falling back to using gettid(2) when it does not. This is generally beneficial, but was specifically motivated by https://github.com/systemd/systemd/issues/475. Signed-off-by: Stephen Smalley <sds@xxxxxxxxxxxxx> --- libselinux/src/procattr.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/libselinux/src/procattr.c b/libselinux/src/procattr.c index f990350..e444571 100644 --- a/libselinux/src/procattr.c +++ b/libselinux/src/procattr.c @@ -95,6 +95,12 @@ static int openattr(pid_t pid, const char *attr, int flags) 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; if (!tid) tid = gettid(); rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); @@ -103,6 +109,7 @@ static int openattr(pid_t pid, const char *attr, int flags) return -1; fd = open(path, flags | O_CLOEXEC); +out: free(path); return fd; } -- 2.1.0 _______________________________________________ Selinux mailing list Selinux@xxxxxxxxxxxxx To unsubscribe, send email to Selinux-leave@xxxxxxxxxxxxx. To get help, send an email containing "help" to Selinux-request@xxxxxxxxxxxxx.
