linux-kernel - [PATCH v2 2/2] selftests: test ioctl(MEMFD_CHECK_IF

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Message-ID: <20230908175738.41895-3-mclapinski@google.com>
Date:   Fri,  8 Sep 2023 19:57:38 +0200
From:   Michal Clapinski <mclapinski@...gle.com>
To:     Jonathan Corbet <corbet@....net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>, Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, Yi Liu <yi.l.liu@...el.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Steve French <stfrench@...rosoft.com>,
        Simon Ser <contact@...rsion.fr>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Marc Dionne <marc.dionne@...istor.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        David Howells <dhowells@...hat.com>,
        Luca Vizzarro <Luca.Vizzarro@....com>,
        Jeff Xu <jeffxu@...gle.com>, Aleksa Sarai <cyphar@...har.com>,
        Kees Cook <keescook@...omium.org>,
        Daniel Verkamp <dverkamp@...omium.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Cc:     Michal Clapinski <mclapinski@...gle.com>
Subject: [PATCH v2 2/2] selftests: test ioctl(MEMFD_CHECK_IF_ORIGINAL)

Signed-off-by: Michal Clapinski <mclapinski@...gle.com>
---
 tools/testing/selftests/memfd/memfd_test.c | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
index 3df008677239..1a702af6e01a 100644
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -13,6 +13,7 @@
 #include <stdlib.h>
 #include <signal.h>
 #include <string.h>
+#include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
@@ -39,6 +40,10 @@
 
 #define MFD_NOEXEC_SEAL	0x0008U
 
+#ifndef MEMFD_CHECK_IF_ORIGINAL
+#define MEMFD_CHECK_IF_ORIGINAL _IOR(0xB8, 0, int)
+#endif
+
 /*
  * Default is not to test hugetlbfs
  */
@@ -1567,6 +1572,31 @@ static void test_share_fork(char *banner, char *b_suffix)
 	close(fd);
 }
 
+static void test_ioctl_check_original(void)
+{
+	int fd, fd2;
+
+	printf("%s IOCTL-CHECK-ORIGINAL\n", memfd_str);
+	fd = sys_memfd_create("kern_memfd_check_original", 0);
+	if (fd < 0) {
+		printf("memfd_create failed: %m\n");
+		abort();
+	}
+	if (ioctl(fd, MEMFD_CHECK_IF_ORIGINAL) != 1) {
+		printf("ioctl(MEMFD_CHECK_IF_ORIGINAL) failed\n");
+		abort();
+	}
+
+	fd2 = mfd_assert_reopen_fd(fd);
+	if (ioctl(fd2, MEMFD_CHECK_IF_ORIGINAL) != 0) {
+		printf("ioctl(MEMFD_CHECK_IF_ORIGINAL) failed\n");
+		abort();
+	}
+
+	close(fd);
+	close(fd2);
+}
+
 int main(int argc, char **argv)
 {
 	pid_t pid;
@@ -1609,6 +1639,8 @@ int main(int argc, char **argv)
 	test_share_open("SHARE-OPEN", "");
 	test_share_fork("SHARE-FORK", "");
 
+	test_ioctl_check_original();
+
 	/* Run test-suite in a multi-threaded environment with a shared
 	 * file-table. */
 	pid = spawn_idle_thread(CLONE_FILES | CLONE_FS | CLONE_VM);
-- 
2.42.0.283.g2d96d420d3-goog