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Clean up some code
This commit is contained in:
Justine Tunney
parent
531bfbd61f
commit
ed161b240e
17 changed files with 107 additions and 182 deletions
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@ -1,163 +0,0 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/fmt/fmt.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/log/log.h"
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#include "libc/mem/gc.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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noasan signed char ReadShadow(signed char *s) {
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return *s;
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}
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void SetUp(void) {
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if (!IsAsan()) exit(0);
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}
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TEST(asan, test) {
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char *p;
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p = gc(malloc(3));
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EXPECT_TRUE(__asan_is_valid(0, 0));
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EXPECT_TRUE(__asan_is_valid(p, 3));
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EXPECT_FALSE(__asan_is_valid(p, 4));
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EXPECT_TRUE(__asan_is_valid(p + 1, 2));
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EXPECT_FALSE(__asan_is_valid(p + 1, 3));
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p = gc(malloc(8 + 3));
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EXPECT_TRUE(__asan_is_valid(p, 8 + 3));
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EXPECT_FALSE(__asan_is_valid(p, 8 + 4));
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EXPECT_TRUE(__asan_is_valid(p + 1, 8 + 2));
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EXPECT_FALSE(__asan_is_valid(p + 1, 8 + 3));
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p = gc(malloc(64 + 3));
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EXPECT_TRUE(__asan_is_valid(p, 64 + 3));
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EXPECT_FALSE(__asan_is_valid(p, 64 + 4));
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EXPECT_TRUE(__asan_is_valid(p + 1, 64 + 2));
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EXPECT_FALSE(__asan_is_valid(p + 1, 64 + 3));
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EXPECT_FALSE(__asan_is_valid(p - 1, 64));
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}
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TEST(asan, test2) {
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char *p;
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p = gc(memalign(16, 64));
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// asan design precludes this kind of poisoning
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__asan_poison(p + 1, 1, kAsanProtected);
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EXPECT_TRUE(__asan_is_valid(p, 2));
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EXPECT_TRUE(__asan_is_valid(p + 1, 2));
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// but we can do this
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__asan_poison(p + 7, 1, kAsanProtected);
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EXPECT_TRUE(__asan_is_valid(p + 6, 1));
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EXPECT_FALSE(__asan_is_valid(p + 7, 1));
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EXPECT_TRUE(__asan_is_valid(p + 8, 1));
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EXPECT_FALSE(__asan_is_valid(p + 6, 2));
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EXPECT_FALSE(__asan_is_valid(p + 7, 2));
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EXPECT_FALSE(__asan_is_valid(p + 6, 3));
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__asan_unpoison(p + 7, 1);
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EXPECT_TRUE(__asan_is_valid(p + 6, 3));
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}
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TEST(asan, testEmptySize_isAlwaysValid) {
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EXPECT_TRUE(__asan_is_valid(0, 0));
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EXPECT_TRUE(__asan_is_valid((void *)(intptr_t)-2, 0));
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EXPECT_TRUE(__asan_is_valid((void *)(intptr_t)9999, 0));
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}
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TEST(asan, testBigSize_worksFine) {
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char *p;
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p = malloc(64 * 1024);
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EXPECT_TRUE(__asan_is_valid(p, 64 * 1024));
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EXPECT_FALSE(__asan_is_valid(p - 1, 64 * 1024));
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EXPECT_FALSE(__asan_is_valid(p + 1, 64 * 1024));
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EXPECT_TRUE(__asan_is_valid(p + 1, 64 * 1024 - 1));
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free(p);
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}
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TEST(asan, testUnmappedShadowMemory_doesntSegfault) {
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EXPECT_FALSE(__asan_is_valid(0, 1));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)-1, 1));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)-2, 1));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)9999, 1));
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EXPECT_FALSE(__asan_is_valid(0, 7));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)-1, 7));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)-2, 7));
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EXPECT_FALSE(__asan_is_valid((void *)(intptr_t)9999, 7));
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}
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TEST(asan, str) {
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char *p;
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int i, j, n, N = 64;
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struct AsanFault f;
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ASSERT_EQ(kAsanNullPage, __asan_check_str(0).kind);
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p = malloc(N);
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for (i = 0; i < N / 2; ++i) {
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for (n = 1; n < N / 2; ++n) {
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__asan_poison(p, i, kAsanProtected);
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__asan_unpoison(p + i, n);
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__asan_poison(p + i + n, N - i - n, kAsanProtected);
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for (j = 0; j < n; ++j) {
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p[i + j + 0] = j < n - 1;
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}
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// test valid string
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f = __asan_check_str(p + i);
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ASSERT_EQ(0, f.kind);
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ASSERT_EQ(0, f.shadow);
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// test pointer underrun
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f = __asan_check_str(p + i - 1);
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if (!i) {
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ASSERT_EQ(kAsanHeapUnderrun, f.kind);
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} else if (!((intptr_t)(p + i) & 7)) {
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ASSERT_EQ(kAsanProtected, f.kind);
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}
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// test missing nul terminator
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p[i + n - 1] = 1;
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f = __asan_check_str(p + i);
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if (i + n == N) {
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ASSERT_EQ(kAsanHeapOverrun, f.kind);
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} else if (i + n + 8 <= N) {
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ASSERT_EQ(kAsanProtected, f.kind);
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} else {
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ASSERT_EQ(kAsanHeapOverrun, f.kind);
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}
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}
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}
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__asan_unpoison(p, N);
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free(p);
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}
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BENCH(asan, bench) {
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char *p;
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size_t n, m;
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m = 4 * 1024 * 1024;
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p = gc(malloc(m));
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EZBENCH_N("__asan_check", 0, EXPROPRIATE(__asan_check(p, 0).kind));
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for (n = 2; n <= m; n *= 2) {
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EZBENCH_N("__asan_check", n, EXPROPRIATE(__asan_check(p, n).kind));
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}
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memset(p, 1, m);
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for (n = m; n >= 2; n /= 2) {
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EZBENCH_N("__asan_check_str", n,
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(p[n - 1] = 0, EXPROPRIATE(__asan_check_str(p).kind)));
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}
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}
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