1 files changed, 63 insertions, 0 deletions

diff --git a/tools/testing/selftests/efivarfs/open-unlink.c b/tools/testing/selftests/efivarfs/open-unlink.c
new file mode 100644
index 000000000000..8c0764407b3c
--- /dev/null
+++ b/tools/testing/selftests/efivarfs/open-unlink.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main(int argc, char **argv)
+{
+        const char *path;
+        char buf[5];
+        int fd, rc;
+
+        if (argc < 2) {
+                fprintf(stderr, "usage: %s <path>\n", argv[0]);
+                return EXIT_FAILURE;
+        }
+
+        path = argv[1];
+
+        /* attributes: EFI_VARIABLE_NON_VOLATILE |
+         *              EFI_VARIABLE_BOOTSERVICE_ACCESS |
+         *              EFI_VARIABLE_RUNTIME_ACCESS
+         */
+        *(uint32_t *)buf = 0x7;
+        buf[4] = 0;
+
+        /* create a test variable */
+        fd = open(path, O_WRONLY | O_CREAT);
+        if (fd < 0) {
+                perror("open(O_WRONLY)");
+                return EXIT_FAILURE;
+        }
+
+        rc = write(fd, buf, sizeof(buf));
+        if (rc != sizeof(buf)) {
+                perror("write");
+                return EXIT_FAILURE;
+        }
+
+        close(fd);
+
+        fd = open(path, O_RDONLY);
+        if (fd < 0) {
+                perror("open");
+                return EXIT_FAILURE;
+        }
+
+        if (unlink(path) < 0) {
+                perror("unlink");
+                return EXIT_FAILURE;
+        }
+
+        rc = read(fd, buf, sizeof(buf));
+        if (rc > 0) {
+                fprintf(stderr, "reading from an unlinked variable "
+                                "shouldn't be possible\n");
+                return EXIT_FAILURE;
+        }
+
+        return EXIT_SUCCESS;
+}