Add personality test case

Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 142 insertions, 2 deletions

diff --git a/test/Makefile b/test/Makefile
index efdc3aa..a975999 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -19,7 +19,7 @@ all_targets += poll poll-cancel ring-leak fsync io_uring_setup io_uring_register
 		poll-many b5837bd5311d-test accept-test d77a67ed5f27-test \
 		connect 7ad0e4b2f83c-test submit-reuse fallocate open-close \
 		file-update statx accept-reuse poll-v-poll fadvise madvise \
-		short-read openat2 probe shared-wq
+		short-read openat2 probe shared-wq personality
 
 include ../Makefile.quiet
 
@@ -45,7 +45,8 @@ test_srcs := poll.c poll-cancel.c ring-leak.c fsync.c io_uring_setup.c \
 	b5837bd5311d-test.c accept-test.c d77a67ed5f27-test.c connect.c \
 	7ad0e4b2f83c-test.c submit-reuse.c fallocate.c open-close.c \
 	file-update.c statx.c accept-reuse.c poll-v-poll.c fadvise.c \
-	madvise.c short-read.c openat2.c probe.c shared-wq.c
+	madvise.c short-read.c openat2.c probe.c shared-wq.c \
+	personality.c
 
 test_objs := $(patsubst %.c,%.ol,$(test_srcs))
 
diff --git a/test/personality.c b/test/personality.c
new file mode 100644
index 0000000..c9001ac
--- /dev/null
+++ b/test/personality.c
@@ -0,0 +1,139 @@
+/*
+ * Description: test if personalities work
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+
+#define FNAME	"/tmp/.tmp.access"
+#define USE_UID	1000
+
+static int open_file(struct io_uring *ring, int cred_id)
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	int ret;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_openat(sqe, -1, FNAME, O_RDONLY, 0);
+
+	if (cred_id != -1) {
+		sqe->flags |= IOSQE_PERSONALITY;
+		sqe->personality = cred_id;
+	}
+
+	ret = io_uring_submit(ring);
+	if (ret != 1) {
+		fprintf(stderr, "submit got: %d\n", ret);
+		goto err;
+	}
+
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret < 0) {
+		fprintf(stderr, "wait completion %d\n", ret);
+		goto err;
+	}
+
+	ret = cqe->res;
+	io_uring_cqe_seen(ring, cqe);
+err:
+	return ret;
+}
+
+static int test_personality(struct io_uring *ring)
+{
+	int ret, cred_id;
+
+	ret = io_uring_register_personality(ring);
+	if (ret < 0) {
+		if (ret == -EINVAL) {
+			fprintf(stdout, "Personalities not supported, skipping\n");
+			goto out;
+		}
+		fprintf(stderr, "register_personality: %d\n", ret);
+		goto err;
+	}
+	cred_id = ret;
+
+	/* create file only owner can open */
+	ret = open(FNAME, O_RDONLY | O_CREAT, 0600);
+	if (ret < 0) {
+		perror("open");
+		goto err;
+	}
+	close(ret);
+
+	/* verify we can open it */
+	ret = open_file(ring, -1);
+	if (ret < 0) {
+		fprintf(stderr, "current open got: %d\n", ret);
+		goto err;
+	}
+
+	if (seteuid(USE_UID) < 0) {
+		fprintf(stdout, "Can't switch to UID %u, skipping\n", USE_UID);
+		goto out;
+	}
+
+	/* verify we can't open it with current credentials */
+	ret = open_file(ring, -1);
+	if (ret != -EACCES) {
+		fprintf(stderr, "open got: %d\n", ret);
+		goto err;
+	}
+
+	/* verify we can open with registered credentials */
+	ret = open_file(ring, cred_id);
+	if (ret < 0) {
+		fprintf(stderr, "credential open: %d\n", ret);
+		goto err;
+	}
+
+	if (seteuid(0))
+		perror("seteuid");
+
+	ret = io_uring_unregister_personality(ring, cred_id);
+	if (ret) {
+		fprintf(stderr, "register_personality: %d\n", ret);
+		goto err;
+	}
+
+out:
+	unlink(FNAME);
+	return 0;
+err:
+	unlink(FNAME);
+	return 1;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring ring;
+	int ret;
+
+	if (geteuid()) {
+		fprintf(stderr, "Not root, skipping\n");
+		return 0;
+	}
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		printf("ring setup failed\n");
+		return 1;
+
+	}
+
+	ret = test_personality(&ring);
+	if (ret) {
+		fprintf(stderr, "test_personality failed\n");
+		return ret;
+	}
+
+	return 0;
+}