From f5fd689e40322a7b08a97eb2d26f192610728230 Mon Sep 17 00:00:00 2001
From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Tue, 18 Jan 2022 16:10:28 +0100
Subject: [PATCH 170/174] tests/linkat: reset errno before SELinux context
 manipulation

To avoid printing a stale error information in case of mismatch check
failure.

* tests/linkat.c: Include <errno.h>.
(main): Add "errno = 0" before update_secontext_field calls.
---
 tests/linkat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/linkat.c b/tests/linkat.c
index 1a869e3..c3e2ee4 100644
--- a/tests/linkat.c
+++ b/tests/linkat.c
@@ -10,6 +10,7 @@
 #include "tests.h"
 #include "scno.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -91,6 +92,7 @@ main(void)
 	free(sample_1_secontext);
 
 #ifdef PRINT_SECONTEXT_MISMATCH
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_USER, "system_u");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 
@@ -112,6 +114,7 @@ main(void)
 	free(sample_1_secontext);
 #endif
 
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_TYPE, "default_t");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 	sample_2_secontext = sample_1_secontext;
@@ -142,6 +145,7 @@ main(void)
 	int dfd_old = get_dir_fd(".");
 	char *cwd = get_fd_path(dfd_old);
 
+	errno = 0;
 	update_secontext_field(".", SECONTEXT_TYPE, "default_t");
 	char *dfd_old_secontext = SECONTEXT_FILE(".");
 
--- a/tests-m32/linkat.c
+++ b/tests-m32/linkat.c
@@ -10,6 +10,7 @@
 #include "tests.h"
 #include "scno.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -91,6 +92,7 @@ main(void)
 	free(sample_1_secontext);
 
 #ifdef PRINT_SECONTEXT_MISMATCH
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_USER, "system_u");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 
@@ -112,6 +114,7 @@ main(void)
 	free(sample_1_secontext);
 #endif
 
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_TYPE, "default_t");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 	sample_2_secontext = sample_1_secontext;
@@ -142,6 +145,7 @@ main(void)
 	int dfd_old = get_dir_fd(".");
 	char *cwd = get_fd_path(dfd_old);
 
+	errno = 0;
 	update_secontext_field(".", SECONTEXT_TYPE, "default_t");
 	char *dfd_old_secontext = SECONTEXT_FILE(".");
 
--- a/tests-mx32/linkat.c
+++ b/tests-mx32/linkat.c
@@ -10,6 +10,7 @@
 #include "tests.h"
 #include "scno.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -91,6 +92,7 @@ main(void)
 	free(sample_1_secontext);
 
 #ifdef PRINT_SECONTEXT_MISMATCH
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_USER, "system_u");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 
@@ -112,6 +114,7 @@ main(void)
 	free(sample_1_secontext);
 #endif
 
+	errno = 0;
 	update_secontext_field(sample_1, SECONTEXT_TYPE, "default_t");
 	sample_1_secontext = SECONTEXT_FILE(sample_1);
 	sample_2_secontext = sample_1_secontext;
@@ -142,6 +145,7 @@ main(void)
 	int dfd_old = get_dir_fd(".");
 	char *cwd = get_fd_path(dfd_old);
 
+	errno = 0;
 	update_secontext_field(".", SECONTEXT_TYPE, "default_t");
 	char *dfd_old_secontext = SECONTEXT_FILE(".");
 
-- 
2.1.4