--- /dev/null
+/* $OpenBSD: explicit_bzero.c,v 1.7 2021/03/27 11:17:58 bcook Exp $ */
+/*
+ * Copyright (c) 2014 Google Inc.
+ *
+ * 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 <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define ASSERT_EQ(a, b) assert((a) == (b))
+#define ASSERT_NE(a, b) assert((a) != (b))
+#define ASSERT_GE(a, b) assert((a) >= (b))
+
+/* 128 bits of random data. */
+static const char secret[16] = {
+ 0xa0, 0x6c, 0x0c, 0x81, 0xba, 0xd8, 0x5b, 0x0c,
+ 0xb0, 0xd6, 0xd4, 0xe3, 0xeb, 0x52, 0x5f, 0x96,
+};
+
+enum {
+ SECRETCOUNT = 64,
+ SECRETBYTES = SECRETCOUNT * sizeof(secret)
+};
+
+/*
+ * As of glibc 2.34, when _GNU_SOURCE is defined, SIGSTKSZ is no longer
+ * constant on Linux. SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
+ */
+static char *altstack;
+#define ALTSTACK_SIZE (SIGSTKSZ + SECRETBYTES)
+
+static void
+setup_stack(void)
+{
+ const stack_t sigstk = {
+ .ss_sp = altstack = calloc(1, ALTSTACK_SIZE),
+ .ss_size = ALTSTACK_SIZE
+ };
+
+ ASSERT_NE(NULL, altstack);
+ ASSERT_EQ(0, sigaltstack(&sigstk, NULL));
+}
+
+static void
+cleanup_stack(void)
+{
+ free(altstack);
+}
+
+static void
+assert_on_stack(void)
+{
+ stack_t cursigstk;
+ ASSERT_EQ(0, sigaltstack(NULL, &cursigstk));
+ ASSERT_EQ(SS_ONSTACK, cursigstk.ss_flags & (SS_DISABLE|SS_ONSTACK));
+}
+
+static void
+call_on_stack(void (*fn)(int))
+{
+ /*
+ * This is a bit more complicated than strictly necessary, but
+ * it ensures we don't have any flaky test failures due to
+ * inherited signal masks/actions/etc.
+ *
+ * On systems where SA_ONSTACK is not supported, this could
+ * alternatively be implemented using makecontext() or
+ * pthread_attr_setstack().
+ */
+
+ const struct sigaction sigact = {
+ .sa_handler = fn,
+ .sa_flags = SA_ONSTACK,
+ };
+ struct sigaction oldsigact;
+ sigset_t sigset, oldsigset;
+
+ /* First, block all signals. */
+ ASSERT_EQ(0, sigemptyset(&sigset));
+ ASSERT_EQ(0, sigfillset(&sigset));
+ ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &sigset, &oldsigset));
+
+ /* Next setup the signal handler for SIGUSR1. */
+ ASSERT_EQ(0, sigaction(SIGUSR1, &sigact, &oldsigact));
+
+ /* Raise SIGUSR1 and momentarily unblock it to run the handler. */
+ ASSERT_EQ(0, raise(SIGUSR1));
+ ASSERT_EQ(0, sigdelset(&sigset, SIGUSR1));
+ ASSERT_EQ(-1, sigsuspend(&sigset));
+ ASSERT_EQ(EINTR, errno);
+
+ /* Restore the original signal action, stack, and mask. */
+ ASSERT_EQ(0, sigaction(SIGUSR1, &oldsigact, NULL));
+ ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &oldsigset, NULL));
+}
+
+static void
+populate_secret(char *buf, ssize_t len)
+{
+ int i, fds[2];
+ ASSERT_EQ(0, pipe(fds));
+
+ for (i = 0; i < SECRETCOUNT; i++)
+ ASSERT_EQ(sizeof(secret), write(fds[1], secret, sizeof(secret)));
+ ASSERT_EQ(0, close(fds[1]));
+
+ ASSERT_EQ(len, read(fds[0], buf, len));
+ ASSERT_EQ(0, close(fds[0]));
+}
+
+static int
+count_secrets(const char *buf)
+{
+ int res = 0;
+ size_t i;
+ for (i = 0; i < SECRETCOUNT; i++) {
+ if (memcmp(buf + i * sizeof(secret), secret,
+ sizeof(secret)) == 0)
+ res += 1;
+ }
+ return (res);
+}
+
+static char *
+test_without_bzero(void)
+{
+ char buf[SECRETBYTES];
+ char *res;
+ assert_on_stack();
+ populate_secret(buf, sizeof(buf));
+ res = memmem(altstack, ALTSTACK_SIZE, buf, sizeof(buf));
+ ASSERT_NE(NULL, res);
+ return (res);
+}
+
+static char *
+test_with_bzero(void)
+{
+ char buf[SECRETBYTES];
+ char *res;
+ assert_on_stack();
+ populate_secret(buf, sizeof(buf));
+ res = memmem(altstack, ALTSTACK_SIZE, buf, sizeof(buf));
+ ASSERT_NE(NULL, res);
+ explicit_bzero(buf, sizeof(buf));
+ return (res);
+}
+
+static void
+do_test_without_bzero(int signo)
+{
+ char *buf = test_without_bzero();
+ ASSERT_GE(count_secrets(buf), 1);
+}
+
+static void
+do_test_with_bzero(int signo)
+{
+ char *buf = test_with_bzero();
+ ASSERT_EQ(count_secrets(buf), 0);
+}
+
+int
+main(int argc, char **argv)
+{
+ setup_stack();
+
+ /*
+ * Solaris and OS X clobber the signal stack after returning to the
+ * normal stack, so we need to inspect altstack while we're still
+ * running on it. Unfortunately, this means we risk clobbering the
+ * buffer ourselves.
+ *
+ * To minimize this risk, test_with{,out}_bzero() are responsible for
+ * locating the offset of their buf variable within altstack, and
+ * and returning that address. Then we can simply memcmp() repeatedly
+ * to count how many instances of secret we found.
+ */
+
+ /*
+ * First, test that if we *don't* call explicit_bzero, that we
+ * *are* able to find at least one instance of the secret data still
+ * on the stack. This sanity checks that call_on_stack() and
+ * populate_secret() work as intended.
+ */
+ memset(altstack, 0, ALTSTACK_SIZE);
+ call_on_stack(do_test_without_bzero);
+
+ /*
+ * Now test with a call to explicit_bzero() and check that we
+ * *don't* find any instances of the secret data.
+ */
+ memset(altstack, 0, ALTSTACK_SIZE);
+ call_on_stack(do_test_with_bzero);
+
+ cleanup_stack();
+
+ return (0);
+}
--- /dev/null
+/* $OpenBSD: strtonumtest.c,v 1.1 2004/08/03 20:38:36 otto Exp $ */
+/*
+ * Copyright (c) 2004 Otto Moerbeek <otto@drijf.net>
+ *
+ * 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 <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int fail;
+
+static void
+test(const char *p, long long lb, long long ub, int ok)
+{
+ long long val;
+ const char *q;
+
+ val = strtonum(p, lb, ub, &q);
+ if (ok && q != NULL) {
+ fprintf(stderr, "%s [%lld-%lld] ", p, lb, ub);
+ fprintf(stderr, "NUMBER NOT ACCEPTED %s\n", q);
+ fail = 1;
+ } else if (!ok && q == NULL) {
+ fprintf(stderr, "%s [%lld-%lld] %lld ", p, lb, ub, val);
+ fprintf(stderr, "NUMBER ACCEPTED\n");
+ fail = 1;
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ test("1", 0, 10, 1);
+ test("0", -2, 5, 1);
+ test("0", 2, 5, 0);
+ test("0", 2, LLONG_MAX, 0);
+ test("-2", 0, LLONG_MAX, 0);
+ test("0", -5, LLONG_MAX, 1);
+ test("-3", -3, LLONG_MAX, 1);
+ test("-9223372036854775808", LLONG_MIN, LLONG_MAX, 1);
+ test("9223372036854775807", LLONG_MIN, LLONG_MAX, 1);
+ test("-9223372036854775809", LLONG_MIN, LLONG_MAX, 0);
+ test("9223372036854775808", LLONG_MIN, LLONG_MAX, 0);
+ test("1000000000000000000000000", LLONG_MIN, LLONG_MAX, 0);
+ test("-1000000000000000000000000", LLONG_MIN, LLONG_MAX, 0);
+ test("-2", 10, -1, 0);
+ test("-2", -10, -1, 1);
+ test("-20", -10, -1, 0);
+ test("20", -10, -1, 0);
+
+ return (fail);
+}
+
projects / thirdparty / libbsd.git / commitdiff
