329 lines
12 KiB
C++
329 lines
12 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <stddef.h>
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#include <stdint.h>
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#include "base/debug/proc_maps_linux.h"
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#include "base/files/file_path.h"
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#include "base/macros.h"
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#include "base/path_service.h"
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#include "base/strings/stringprintf.h"
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#include "base/threading/platform_thread.h"
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#include "build/build_config.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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namespace debug {
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TEST(ProcMapsTest, Empty) {
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std::vector<MappedMemoryRegion> regions;
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EXPECT_TRUE(ParseProcMaps("", ®ions));
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EXPECT_EQ(0u, regions.size());
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}
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TEST(ProcMapsTest, NoSpaces) {
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static const char kNoSpaces[] =
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"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kNoSpaces, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0x00400000u, regions[0].start);
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EXPECT_EQ(0x0040b000u, regions[0].end);
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EXPECT_EQ(0x00002200u, regions[0].offset);
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EXPECT_EQ("/bin/cat", regions[0].path);
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}
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TEST(ProcMapsTest, Spaces) {
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static const char kSpaces[] =
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"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/space cat\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kSpaces, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0x00400000u, regions[0].start);
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EXPECT_EQ(0x0040b000u, regions[0].end);
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EXPECT_EQ(0x00002200u, regions[0].offset);
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EXPECT_EQ("/bin/space cat", regions[0].path);
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}
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TEST(ProcMapsTest, NoNewline) {
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static const char kNoSpaces[] =
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"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_FALSE(ParseProcMaps(kNoSpaces, ®ions));
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}
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TEST(ProcMapsTest, NoPath) {
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static const char kNoPath[] =
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"00400000-0040b000 rw-p 00000000 00:00 0 \n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kNoPath, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0x00400000u, regions[0].start);
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EXPECT_EQ(0x0040b000u, regions[0].end);
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EXPECT_EQ(0x00000000u, regions[0].offset);
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EXPECT_EQ("", regions[0].path);
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}
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TEST(ProcMapsTest, Heap) {
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static const char kHeap[] =
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"022ac000-022cd000 rw-p 00000000 00:00 0 [heap]\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kHeap, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0x022ac000u, regions[0].start);
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EXPECT_EQ(0x022cd000u, regions[0].end);
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EXPECT_EQ(0x00000000u, regions[0].offset);
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EXPECT_EQ("[heap]", regions[0].path);
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}
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#if defined(ARCH_CPU_32_BITS)
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TEST(ProcMapsTest, Stack32) {
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static const char kStack[] =
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"beb04000-beb25000 rw-p 00000000 00:00 0 [stack]\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kStack, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0xbeb04000u, regions[0].start);
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EXPECT_EQ(0xbeb25000u, regions[0].end);
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EXPECT_EQ(0x00000000u, regions[0].offset);
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EXPECT_EQ("[stack]", regions[0].path);
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}
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#elif defined(ARCH_CPU_64_BITS)
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TEST(ProcMapsTest, Stack64) {
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static const char kStack[] =
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"7fff69c5b000-7fff69c7d000 rw-p 00000000 00:00 0 [stack]\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kStack, ®ions));
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ASSERT_EQ(1u, regions.size());
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EXPECT_EQ(0x7fff69c5b000u, regions[0].start);
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EXPECT_EQ(0x7fff69c7d000u, regions[0].end);
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EXPECT_EQ(0x00000000u, regions[0].offset);
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EXPECT_EQ("[stack]", regions[0].path);
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}
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#endif
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TEST(ProcMapsTest, Multiple) {
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static const char kMultiple[] =
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"00400000-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n"
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"0060a000-0060b000 r--p 0000a000 fc:00 794418 /bin/cat\n"
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"0060b000-0060c000 rw-p 0000b000 fc:00 794418 /bin/cat\n";
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(kMultiple, ®ions));
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ASSERT_EQ(3u, regions.size());
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EXPECT_EQ(0x00400000u, regions[0].start);
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EXPECT_EQ(0x0040b000u, regions[0].end);
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EXPECT_EQ(0x00000000u, regions[0].offset);
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EXPECT_EQ("/bin/cat", regions[0].path);
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EXPECT_EQ(0x0060a000u, regions[1].start);
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EXPECT_EQ(0x0060b000u, regions[1].end);
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EXPECT_EQ(0x0000a000u, regions[1].offset);
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EXPECT_EQ("/bin/cat", regions[1].path);
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EXPECT_EQ(0x0060b000u, regions[2].start);
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EXPECT_EQ(0x0060c000u, regions[2].end);
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EXPECT_EQ(0x0000b000u, regions[2].offset);
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EXPECT_EQ("/bin/cat", regions[2].path);
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}
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TEST(ProcMapsTest, Permissions) {
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static struct {
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const char* input;
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uint8_t permissions;
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} kTestCases[] = {
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{"00400000-0040b000 ---s 00000000 fc:00 794418 /bin/cat\n", 0},
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{"00400000-0040b000 ---S 00000000 fc:00 794418 /bin/cat\n", 0},
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{"00400000-0040b000 r--s 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::READ},
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{"00400000-0040b000 -w-s 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::WRITE},
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{"00400000-0040b000 --xs 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::EXECUTE},
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{"00400000-0040b000 rwxs 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::READ | MappedMemoryRegion::WRITE |
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MappedMemoryRegion::EXECUTE},
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{"00400000-0040b000 ---p 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::PRIVATE},
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{"00400000-0040b000 r--p 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::READ | MappedMemoryRegion::PRIVATE},
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{"00400000-0040b000 -w-p 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::WRITE | MappedMemoryRegion::PRIVATE},
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{"00400000-0040b000 --xp 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::EXECUTE | MappedMemoryRegion::PRIVATE},
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{"00400000-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
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MappedMemoryRegion::READ | MappedMemoryRegion::WRITE |
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MappedMemoryRegion::EXECUTE | MappedMemoryRegion::PRIVATE},
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};
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for (size_t i = 0; i < arraysize(kTestCases); ++i) {
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SCOPED_TRACE(
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base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i].input));
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std::vector<MappedMemoryRegion> regions;
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EXPECT_TRUE(ParseProcMaps(kTestCases[i].input, ®ions));
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EXPECT_EQ(1u, regions.size());
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if (regions.empty())
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continue;
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EXPECT_EQ(kTestCases[i].permissions, regions[0].permissions);
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}
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}
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#if defined(ADDRESS_SANITIZER)
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// AddressSanitizer may move local variables to a dedicated "fake stack" which
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// is outside the stack region listed in /proc/self/maps. We disable ASan
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// instrumentation for this function to force the variable to be local.
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__attribute__((no_sanitize_address))
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#endif
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void CheckProcMapsRegions(const std::vector<MappedMemoryRegion> ®ions) {
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// We should be able to find both the current executable as well as the stack
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// mapped into memory. Use the address of |exe_path| as a way of finding the
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// stack.
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FilePath exe_path;
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EXPECT_TRUE(PathService::Get(FILE_EXE, &exe_path));
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uintptr_t address = reinterpret_cast<uintptr_t>(&exe_path);
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bool found_exe = false;
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bool found_stack = false;
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bool found_address = false;
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for (size_t i = 0; i < regions.size(); ++i) {
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if (regions[i].path == exe_path.value()) {
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// It's OK to find the executable mapped multiple times as there'll be
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// multiple sections (e.g., text, data).
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found_exe = true;
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}
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if (regions[i].path == "[stack]") {
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// On Android the test is run on a background thread, since [stack] is for
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// the main thread, we cannot test this.
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#if !defined(OS_ANDROID)
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EXPECT_GE(address, regions[i].start);
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EXPECT_LT(address, regions[i].end);
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#endif
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EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::READ);
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EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::WRITE);
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EXPECT_FALSE(regions[i].permissions & MappedMemoryRegion::EXECUTE);
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EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::PRIVATE);
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EXPECT_FALSE(found_stack) << "Found duplicate stacks";
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found_stack = true;
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}
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if (address >= regions[i].start && address < regions[i].end) {
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EXPECT_FALSE(found_address) << "Found same address in multiple regions";
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found_address = true;
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}
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}
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EXPECT_TRUE(found_exe);
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EXPECT_TRUE(found_stack);
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EXPECT_TRUE(found_address);
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}
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TEST(ProcMapsTest, ReadProcMaps) {
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std::string proc_maps;
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ASSERT_TRUE(ReadProcMaps(&proc_maps));
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std::vector<MappedMemoryRegion> regions;
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ASSERT_TRUE(ParseProcMaps(proc_maps, ®ions));
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ASSERT_FALSE(regions.empty());
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CheckProcMapsRegions(regions);
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}
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TEST(ProcMapsTest, ReadProcMapsNonEmptyString) {
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std::string old_string("I forgot to clear the string");
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std::string proc_maps(old_string);
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ASSERT_TRUE(ReadProcMaps(&proc_maps));
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EXPECT_EQ(std::string::npos, proc_maps.find(old_string));
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}
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TEST(ProcMapsTest, MissingFields) {
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static const char* const kTestCases[] = {
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"00400000\n", // Missing end + beyond.
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"00400000-0040b000\n", // Missing perms + beyond.
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"00400000-0040b000 r-xp\n", // Missing offset + beyond.
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"00400000-0040b000 r-xp 00000000\n", // Missing device + beyond.
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"00400000-0040b000 r-xp 00000000 fc:00\n", // Missing inode + beyond.
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"00400000-0040b000 00000000 fc:00 794418 /bin/cat\n", // Missing perms.
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"00400000-0040b000 r-xp fc:00 794418 /bin/cat\n", // Missing offset.
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"00400000-0040b000 r-xp 00000000 fc:00 /bin/cat\n", // Missing inode.
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"00400000 r-xp 00000000 fc:00 794418 /bin/cat\n", // Missing end.
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"-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n", // Missing start.
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"00400000-0040b000 r-xp 00000000 794418 /bin/cat\n", // Missing device.
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};
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for (size_t i = 0; i < arraysize(kTestCases); ++i) {
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SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
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std::vector<MappedMemoryRegion> regions;
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EXPECT_FALSE(ParseProcMaps(kTestCases[i], ®ions));
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}
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}
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TEST(ProcMapsTest, InvalidInput) {
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static const char* const kTestCases[] = {
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"thisisal-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
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"0040000d-linvalid rwxp 00000000 fc:00 794418 /bin/cat\n",
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"00400000-0040b000 inpu 00000000 fc:00 794418 /bin/cat\n",
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"00400000-0040b000 rwxp tforproc fc:00 794418 /bin/cat\n",
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"00400000-0040b000 rwxp 00000000 ma:ps 794418 /bin/cat\n",
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"00400000-0040b000 rwxp 00000000 fc:00 parse! /bin/cat\n",
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};
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for (size_t i = 0; i < arraysize(kTestCases); ++i) {
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SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
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std::vector<MappedMemoryRegion> regions;
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EXPECT_FALSE(ParseProcMaps(kTestCases[i], ®ions));
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}
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}
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TEST(ProcMapsTest, ParseProcMapsEmptyString) {
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std::vector<MappedMemoryRegion> regions;
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EXPECT_TRUE(ParseProcMaps("", ®ions));
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EXPECT_EQ(0ULL, regions.size());
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}
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// Testing a couple of remotely possible weird things in the input:
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// - Line ending with \r\n or \n\r.
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// - File name contains quotes.
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// - File name has whitespaces.
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TEST(ProcMapsTest, ParseProcMapsWeirdCorrectInput) {
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std::vector<MappedMemoryRegion> regions;
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const std::string kContents =
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"00400000-0040b000 r-xp 00000000 fc:00 2106562 "
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" /bin/cat\r\n"
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"7f53b7dad000-7f53b7f62000 r-xp 00000000 fc:00 263011 "
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" /lib/x86_64-linux-gnu/libc-2.15.so\n\r"
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"7f53b816d000-7f53b818f000 r-xp 00000000 fc:00 264284 "
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" /lib/x86_64-linux-gnu/ld-2.15.so\n"
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"7fff9c7ff000-7fff9c800000 r-xp 00000000 00:00 0 "
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" \"vd so\"\n"
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"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 "
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" [vsys call]\n";
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EXPECT_TRUE(ParseProcMaps(kContents, ®ions));
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EXPECT_EQ(5ULL, regions.size());
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EXPECT_EQ("/bin/cat", regions[0].path);
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EXPECT_EQ("/lib/x86_64-linux-gnu/libc-2.15.so", regions[1].path);
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EXPECT_EQ("/lib/x86_64-linux-gnu/ld-2.15.so", regions[2].path);
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EXPECT_EQ("\"vd so\"", regions[3].path);
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EXPECT_EQ("[vsys call]", regions[4].path);
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}
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} // namespace debug
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} // namespace base
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