tests: add test case for fchown/fchmod with O_RDONLY.

Bug: https://bugs.gentoo.org/599706
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>
Signed-off-by: Mike Gilbert <floppym@gentoo.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/fchmod-0.c b/tests/fchmod-0.c
new file mode 100644
index 0000000..de0c237
--- /dev/null
+++ b/tests/fchmod-0.c
@@ -0,0 +1,35 @@
+/*
+ * https://bugs.gentoo.org/599706
+ *
+ */
+
+#include "headers.h"
+
+int main(int argc, char *argv[])
+{
+	if (argc < 2)
+		return -2;
+
+	int mode = 0;
+	sscanf(argv[1], "%i", &mode);
+	/* The sandbox catches this:
+	 *
+	 *   int fd = open(argv[2], O_RDWR);
+	 *
+	 * And it /should/ catch this:
+	 *
+	 *    int fd = open(argv[2], O_RDONLY);
+	 *
+	 * ...but the latter only works when /proc/self/fd/%i
+	 * is available.
+	 *
+	 */
+#ifdef SANDBOX_PROC_SELF_FD
+	int fd = open(argv[2], O_RDONLY);
+#else
+	int fd = open(argv[2], O_RDWR);
+#endif
+	int fchmod_result = fchmod(fd, (mode_t)mode);
+	close(fd);
+	return fchmod_result;
+}