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92 lines
2.3 KiB
92 lines
2.3 KiB
diff --git a/tests/explicit_bzero.c b/tests/explicit_bzero.c
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index 34c60baa8a..9c0e917829 100644
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--- a/tests/explicit_bzero.c
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+++ b/tests/explicit_bzero.c
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@@ -1,4 +1,4 @@
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-/* $OpenBSD: explicit_bzero.c,v 1.6 2014/07/11 01:10:35 matthew Exp $ */
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+/* $OpenBSD: explicit_bzero.c,v 1.7 2021/03/27 11:17:58 bcook Exp $ */
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/*
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* Copyright (c) 2014 Google Inc.
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*
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@@ -18,6 +18,7 @@
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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+#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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@@ -36,19 +37,33 @@ enum {
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SECRETBYTES = SECRETCOUNT * sizeof(secret)
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};
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-static char altstack[SIGSTKSZ + SECRETBYTES];
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+/*
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+ * As of glibc 2.34, when _GNU_SOURCE is defined, SIGSTKSZ is no longer
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+ * constant on Linux. SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
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+ */
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+static char *altstack;
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+#define ALTSTACK_SIZE (SIGSTKSZ + SECRETBYTES)
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static void
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setup_stack(void)
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{
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+ altstack = calloc(1, ALTSTACK_SIZE);
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+ ASSERT_NE(NULL, altstack);
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+
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const stack_t sigstk = {
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.ss_sp = altstack,
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- .ss_size = sizeof(altstack),
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+ .ss_size = ALTSTACK_SIZE
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};
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ASSERT_EQ(0, sigaltstack(&sigstk, NULL));
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}
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+static void
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+cleanup_stack(void)
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+{
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+ free(altstack);
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+}
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+
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static void
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assert_on_stack(void)
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{
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@@ -129,7 +144,7 @@ test_without_bzero()
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char buf[SECRETBYTES];
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assert_on_stack();
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populate_secret(buf, sizeof(buf));
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- char *res = memmem(altstack, sizeof(altstack), buf, sizeof(buf));
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+ char *res = memmem(altstack, ALTSTACK_SIZE, buf, sizeof(buf));
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ASSERT_NE(NULL, res);
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return (res);
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}
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@@ -140,7 +155,7 @@ test_with_bzero()
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char buf[SECRETBYTES];
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assert_on_stack();
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populate_secret(buf, sizeof(buf));
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- char *res = memmem(altstack, sizeof(altstack), buf, sizeof(buf));
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+ char *res = memmem(altstack, ALTSTACK_SIZE, buf, sizeof(buf));
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ASSERT_NE(NULL, res);
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explicit_bzero(buf, sizeof(buf));
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return (res);
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@@ -183,15 +198,17 @@ main()
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* on the stack. This sanity checks that call_on_stack() and
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* populate_secret() work as intended.
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*/
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- memset(altstack, 0, sizeof(altstack));
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+ memset(altstack, 0, ALTSTACK_SIZE);
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call_on_stack(do_test_without_bzero);
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/*
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* Now test with a call to explicit_bzero() and check that we
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* *don't* find any instances of the secret data.
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*/
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- memset(altstack, 0, sizeof(altstack));
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+ memset(altstack, 0, ALTSTACK_SIZE);
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call_on_stack(do_test_with_bzero);
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+ cleanup_stack();
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+
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return (0);
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}
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