Add a regression test for executing memfd files

test/src/apps/execve/execve_memfd.c

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <assert.h>
+#include "../test.h"
+
+#define EXECUTABLE_PATH "/test/execve/hello"
+#define MFD_NAME "test_memfd_execve"
+
+FN_TEST(memfd_noexec_seal)
+{
+	int memfd = TEST_SUCC(
+		memfd_create(MFD_NAME, MFD_CLOEXEC | MFD_NOEXEC_SEAL));
+
+	TEST_RES(fcntl(memfd, F_GET_SEALS), _ret == F_SEAL_EXEC);
+
+	struct stat st;
+	TEST_RES(fstat(memfd, &st), (st.st_mode & 0777) == 0666);
+	TEST_ERRNO(fchmod(memfd, 0777), EPERM);
+
+	TEST_SUCC(close(memfd));
+}
+END_TEST()
+
+FN_TEST(execveat_memfd)
+{
+	int hello_fd = TEST_SUCC(open(EXECUTABLE_PATH, O_RDONLY));
+	int memfd = TEST_SUCC(
+		memfd_create(MFD_NAME, MFD_CLOEXEC | MFD_ALLOW_SEALING));
+
+	char buffer[65536];
+	ssize_t bytes_read;
+	while ((bytes_read =
+			TEST_SUCC(read(hello_fd, buffer, sizeof(buffer))))) {
+		TEST_RES(write(memfd, buffer, bytes_read), _ret == bytes_read);
+	}
+	TEST_SUCC(close(hello_fd));
+
+	TEST_SUCC(fcntl(memfd, F_ADD_SEALS, F_SEAL_EXEC));
+	TEST_RES(fcntl(memfd, F_GET_SEALS),
+		 _ret == (F_SEAL_EXEC | F_SEAL_SHRINK | F_SEAL_GROW |
+			  F_SEAL_WRITE | F_SEAL_FUTURE_WRITE));
+
+	pid_t pid = TEST_SUCC(fork());
+	if (pid == 0) {
+		struct stat st;
+		CHECK_WITH(fstat(memfd, &st),
+			   _ret >= 0 && (st.st_mode & 0777) == 0777);
+		CHECK_WITH(fchmod(memfd, 0666), _ret < 0 && errno == EPERM);
+
+		char *const argv[] = { "memfd_hello", NULL };
+		char *const envp[] = { "PATH=/bin:/usr/bin", NULL };
+		CHECK(execveat(memfd, "", argv, envp, AT_EMPTY_PATH));
+
+		exit(EXIT_FAILURE);
+	}
+
+	int status = 0;
+	TEST_RES(wait4(pid, &status, 0, NULL),
+		 _ret == pid && WIFEXITED(status) &&
+			 WEXITSTATUS(status) == EXIT_SUCCESS);
+}
+END_TEST()

test/src/apps/execve/hello.c

@@ -4,7 +4,7 @@
 
 int main(int argc, char *argv[], char *envp[])
 {
-	printf("Hello world from hello.c(execved in execve.c)!\n");
+	printf("Hello world from hello.c!\n");
 	printf("argc = %d\n", argc);
 	for (int i = 0; i < argc; i++) {
 		printf("%s\n", argv[i]);

test/src/apps/scripts/process.sh

@@ -18,6 +18,7 @@ clone3/clone_process
 cpu_affinity/cpu_affinity
 execve/execve
 execve/execve_mt_parent
+execve/execve_memfd
 exit/exit_code
 exit/exit_procfs
 eventfd2/eventfd2