1 files changed, 121 insertions, 0 deletions
diff --git a/lib/util/regress/closefrom/closefrom_test.c b/lib/util/regress/closefrom/closefrom_test.c
new file mode 100644
index 0000000..375bb51
--- /dev/null
+++ b/lib/util/regress/closefrom/closefrom_test.c
@@ -0,0 +1,121 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2022 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define SUDO_ERROR_WRAP 0
+
+#include "sudo_compat.h"
+#include "sudo_fatal.h"
+#include "sudo_util.h"
+
+sudo_dso_public int main(int argc, char *argv[]);
+
+/*
+ * Test that sudo_closefrom() works as expected.
+ */
+
+int
+main(int argc, char *argv[])
+{
+    int ch, fds[2], flag, maxfd, minfd, errors = 0, ntests = 0;
+    initprogname(argc > 0 ? argv[0] : "closefrom_test");
+
+    while ((ch = getopt(argc, argv, "v")) != -1) {
+	switch (ch) {
+	case 'v':
+	    /* ignore */
+	    break;
+	default:
+	    fprintf(stderr, "usage: %s [-v]\n", getprogname());
+	    return EXIT_FAILURE;
+	}
+    }
+    argc -= optind;
+    argv += optind;
+
+    /* We use pipe() because it doesn't rely on the filesystem. */
+    ntests++;
+    if (pipe(fds) == -1) {
+	sudo_warn("%s", "pipe");
+	errors++;
+	goto done;
+    }
+    maxfd = MAX(fds[0], fds[1]);
+    minfd = MIN(fds[0], fds[1]);
+
+    /* Close any fds greater than fds[0] and fds[1]. */
+    sudo_closefrom(maxfd + 1);
+
+    /* Verify that sudo_closefrom() didn't close fds[0] or fds[1]. */
+    ntests++;
+    if (fcntl(fds[0], F_GETFL, 0) == -1) {
+	sudo_warnx("fd %d closed prematurely", fds[0]);
+	errors++;
+	goto done;
+    }
+    ntests++;
+    if (fcntl(fds[1], F_GETFL, 0) == -1) {
+	sudo_warnx("fd %d closed prematurely", fds[1]);
+	errors++;
+	goto done;
+    }
+
+    /* Close fds[0], fds[1] and above. */
+    sudo_closefrom(minfd);
+
+    /* Verify that sudo_closefrom() closed both fds. */
+    ntests++;
+    flag = fcntl(fds[0], F_GETFD, 0);
+#ifdef __APPLE__
+    /* We only set the close-on-exec flag on macOS. */
+    if (flag == 1)
+	flag = -1;
+#endif
+    if (flag != -1) {
+	sudo_warnx("fd %d still open", fds[0]);
+	errors++;
+	goto done;
+    }
+    ntests++;
+    flag = fcntl(fds[1], F_GETFD, 0);
+#ifdef __APPLE__
+    /* We only set the close-on-exec flag on macOS. */
+    if (flag == 1)
+	flag = -1;
+#endif
+    if (flag != -1) {
+	sudo_warnx("fd %d still open", fds[1]);
+	errors++;
+	goto done;
+    }
+
+done:
+    if (ntests != 0) {
+	printf("%s: %d tests run, %d errors, %d%% success rate\n",
+	    getprogname(), ntests, errors, (ntests - errors) * 100 / ntests);
+    }
+    return errors;
+}