Test for uname26 exploit CVE-2012-0957

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+/*
+ * Copyright (c) 2017 Richard Palethorpe <[email protected]>
+ * Copyright (c) 2012, Kees Cook <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Check that memory after the string terminator in all the utsname fields has
+ * been zeroed. cve-2012-0957 leaked kernel memory through the release field
+ * when the UNAME26 personality was set.
+ *
+ * Thanks to Kees Cook for the original proof of concept:
+ * http://www.securityfocus.com/bid/55855/info
+ */
+
+#include <string.h>
+#include <sys/utsname.h>
+#include <sys/personality.h>
+#include "tst_test.h"
+
+#define UNAME26 0x0020000
+
+static int check_field(char *bytes, size_t length, char *field)
+{
+	size_t i = strlen(bytes) + 1;
+
+	for (; i < length; i++) {
+		if (bytes[i]) {
+			tst_res(TFAIL, "Bytes leaked in %s!", field);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+
+static void try_leak_bytes(void)
+{
+	struct utsname buf;
+
+	if (uname(&buf))
+		tst_brk(TBROK | TERRNO, "Call to uname failed");
+
+#define CHECK_FIELD(field_name) \
+	(check_field(buf.field_name, ARRAY_SIZE(buf.field_name), #field_name))
+
+	if (!(CHECK_FIELD(release) |
+	    CHECK_FIELD(sysname) |
+	    CHECK_FIELD(nodename) |
+	    CHECK_FIELD(version) |
+	    CHECK_FIELD(machine) |
+#ifdef _GNU_SOURCE
+	    CHECK_FIELD(domainname) |
+#endif
+		    0)) {
+		tst_res(TPASS, "All fields zeroed after string terminator");
+	}
+#undef CHECK_FIELD
+}
+
+static void run(unsigned int test_nr)
+{
+	if (!test_nr) {
+		tst_res(TINFO, "Calling uname with default personality");
+		try_leak_bytes();
+	} else {
+		if (personality(PER_LINUX | UNAME26) < 0)
+			tst_brk(TCONF | TERRNO,
+				"Could not change personality to UNAME26");
+		tst_res(TINFO, "Calling uname with UNAME26 personality");
+		try_leak_bytes();
+	}
+}
+
+static struct tst_test test = {
+	.tid = "cve-2012-0957",
+	.test = run,
+	.tcnt = 2,
+};