base/debug/proc_maps_linux_unittest.cc - mojo - Git at Google

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "base/debug/proc_maps_linux.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/platform_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace base {
 namespace debug {

 TEST(ProcMapsTest, Empty) {
   std::vector<MappedMemoryRegion> regions;
   EXPECT_TRUE(ParseProcMaps("", &regions));
   EXPECT_EQ(0u, regions.size());
 }

 TEST(ProcMapsTest, NoSpaces) {
   static const char kNoSpaces[] =
       "00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kNoSpaces, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0x00400000u, regions[0].start);
   EXPECT_EQ(0x0040b000u, regions[0].end);
   EXPECT_EQ(0x00002200u, regions[0].offset);
   EXPECT_EQ("/bin/cat", regions[0].path);
 }

 TEST(ProcMapsTest, Spaces) {
   static const char kSpaces[] =
       "00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/space cat\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kSpaces, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0x00400000u, regions[0].start);
   EXPECT_EQ(0x0040b000u, regions[0].end);
   EXPECT_EQ(0x00002200u, regions[0].offset);
   EXPECT_EQ("/bin/space cat", regions[0].path);
 }

 TEST(ProcMapsTest, NoNewline) {
   static const char kNoSpaces[] =
       "00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_FALSE(ParseProcMaps(kNoSpaces, &regions));
 }

 TEST(ProcMapsTest, NoPath) {
   static const char kNoPath[] =
       "00400000-0040b000 rw-p 00000000 00:00 0 \n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kNoPath, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0x00400000u, regions[0].start);
   EXPECT_EQ(0x0040b000u, regions[0].end);
   EXPECT_EQ(0x00000000u, regions[0].offset);
   EXPECT_EQ("", regions[0].path);
 }

 TEST(ProcMapsTest, Heap) {
   static const char kHeap[] =
       "022ac000-022cd000 rw-p 00000000 00:00 0 [heap]\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kHeap, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0x022ac000u, regions[0].start);
   EXPECT_EQ(0x022cd000u, regions[0].end);
   EXPECT_EQ(0x00000000u, regions[0].offset);
   EXPECT_EQ("[heap]", regions[0].path);
 }

 #if defined(ARCH_CPU_32_BITS)
 TEST(ProcMapsTest, Stack32) {
   static const char kStack[] =
       "beb04000-beb25000 rw-p 00000000 00:00 0 [stack]\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kStack, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0xbeb04000u, regions[0].start);
   EXPECT_EQ(0xbeb25000u, regions[0].end);
   EXPECT_EQ(0x00000000u, regions[0].offset);
   EXPECT_EQ("[stack]", regions[0].path);
 }
 #elif defined(ARCH_CPU_64_BITS)
 TEST(ProcMapsTest, Stack64) {
   static const char kStack[] =
       "7fff69c5b000-7fff69c7d000 rw-p 00000000 00:00 0 [stack]\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kStack, &regions));
   ASSERT_EQ(1u, regions.size());

   EXPECT_EQ(0x7fff69c5b000u, regions[0].start);
   EXPECT_EQ(0x7fff69c7d000u, regions[0].end);
   EXPECT_EQ(0x00000000u, regions[0].offset);
   EXPECT_EQ("[stack]", regions[0].path);
 }
 #endif

 TEST(ProcMapsTest, Multiple) {
   static const char kMultiple[] =
       "00400000-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n"
       "0060a000-0060b000 r--p 0000a000 fc:00 794418 /bin/cat\n"
       "0060b000-0060c000 rw-p 0000b000 fc:00 794418 /bin/cat\n";

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(kMultiple, &regions));
   ASSERT_EQ(3u, regions.size());

   EXPECT_EQ(0x00400000u, regions[0].start);
   EXPECT_EQ(0x0040b000u, regions[0].end);
   EXPECT_EQ(0x00000000u, regions[0].offset);
   EXPECT_EQ("/bin/cat", regions[0].path);

   EXPECT_EQ(0x0060a000u, regions[1].start);
   EXPECT_EQ(0x0060b000u, regions[1].end);
   EXPECT_EQ(0x0000a000u, regions[1].offset);
   EXPECT_EQ("/bin/cat", regions[1].path);

   EXPECT_EQ(0x0060b000u, regions[2].start);
   EXPECT_EQ(0x0060c000u, regions[2].end);
   EXPECT_EQ(0x0000b000u, regions[2].offset);
   EXPECT_EQ("/bin/cat", regions[2].path);
 }

 TEST(ProcMapsTest, Permissions) {
   static struct {
     const char* input;
     uint8 permissions;
   } kTestCases[] = {
     {"00400000-0040b000 ---s 00000000 fc:00 794418 /bin/cat\n", 0},
     {"00400000-0040b000 ---S 00000000 fc:00 794418 /bin/cat\n", 0},
     {"00400000-0040b000 r--s 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::READ},
     {"00400000-0040b000 -w-s 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::WRITE},
     {"00400000-0040b000 --xs 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::EXECUTE},
     {"00400000-0040b000 rwxs 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::READ | MappedMemoryRegion::WRITE |
          MappedMemoryRegion::EXECUTE},
     {"00400000-0040b000 ---p 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::PRIVATE},
     {"00400000-0040b000 r--p 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::READ | MappedMemoryRegion::PRIVATE},
     {"00400000-0040b000 -w-p 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::WRITE | MappedMemoryRegion::PRIVATE},
     {"00400000-0040b000 --xp 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::EXECUTE | MappedMemoryRegion::PRIVATE},
     {"00400000-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
      MappedMemoryRegion::READ | MappedMemoryRegion::WRITE |
          MappedMemoryRegion::EXECUTE | MappedMemoryRegion::PRIVATE},
   };

   for (size_t i = 0; i < arraysize(kTestCases); ++i) {
     SCOPED_TRACE(
         base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i].input));

     std::vector<MappedMemoryRegion> regions;
     EXPECT_TRUE(ParseProcMaps(kTestCases[i].input, &regions));
     EXPECT_EQ(1u, regions.size());
     if (regions.empty())
       continue;
     EXPECT_EQ(kTestCases[i].permissions, regions[0].permissions);
   }
 }

 #if defined(ADDRESS_SANITIZER)
 // AddressSanitizer may move local variables to a dedicated "fake stack" which
 // is outside the stack region listed in /proc/self/maps. We disable ASan
 // instrumentation for this function to force the variable to be local.
 __attribute__((no_sanitize_address))
 #endif
 void CheckProcMapsRegions(const std::vector<MappedMemoryRegion> &regions) {
   // We should be able to find both the current executable as well as the stack
   // mapped into memory. Use the address of |exe_path| as a way of finding the
   // stack.
   FilePath exe_path;
   EXPECT_TRUE(PathService::Get(FILE_EXE, &exe_path));
   uintptr_t address = reinterpret_cast<uintptr_t>(&exe_path);
   bool found_exe = false;
   bool found_stack = false;
   bool found_address = false;

   for (size_t i = 0; i < regions.size(); ++i) {
     if (regions[i].path == exe_path.value()) {
       // It's OK to find the executable mapped multiple times as there'll be
       // multiple sections (e.g., text, data).
       found_exe = true;
     }

     // Valgrind uses its own allocated stacks instead of the kernel-provided
     // stack without letting the kernel know via prctl(PR_SET_MM_START_STACK).
     // Depending on which kernel you're running it'll impact the output of
     // /proc/self/maps.
     //
     // Prior to version 3.4, the kernel completely ignores other stacks and
     // always prints out the vma lying within mm->start_stack as [stack] even
     // if the program was currently executing on a different stack.
     //
     // Starting in 3.4, the kernel will print out the vma containing the current
     // stack pointer as [stack:TID] as long as that vma does not lie within
     // mm->start_stack.
     //
     // Because this has gotten too complicated and brittle of a test, completely
     // ignore checking for the stack and address when running under Valgrind.
     // See http://crbug.com/431702 for more details.
     if (!RunningOnValgrind() && regions[i].path == "[stack]") {
       EXPECT_GE(address, regions[i].start);
       EXPECT_LT(address, regions[i].end);
       EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::READ);
       EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::WRITE);
       EXPECT_FALSE(regions[i].permissions & MappedMemoryRegion::EXECUTE);
       EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::PRIVATE);
       EXPECT_FALSE(found_stack) << "Found duplicate stacks";
       found_stack = true;
     }

     if (address >= regions[i].start && address < regions[i].end) {
       EXPECT_FALSE(found_address) << "Found same address in multiple regions";
       found_address = true;
     }
   }

   EXPECT_TRUE(found_exe);
   if (!RunningOnValgrind()) {
     EXPECT_TRUE(found_stack);
     EXPECT_TRUE(found_address);
   }
 }

 TEST(ProcMapsTest, ReadProcMaps) {
   std::string proc_maps;
   ASSERT_TRUE(ReadProcMaps(&proc_maps));

   std::vector<MappedMemoryRegion> regions;
   ASSERT_TRUE(ParseProcMaps(proc_maps, &regions));
   ASSERT_FALSE(regions.empty());

   CheckProcMapsRegions(regions);
 }

 TEST(ProcMapsTest, ReadProcMapsNonEmptyString) {
   std::string old_string("I forgot to clear the string");
   std::string proc_maps(old_string);
   ASSERT_TRUE(ReadProcMaps(&proc_maps));
   EXPECT_EQ(std::string::npos, proc_maps.find(old_string));
 }

 TEST(ProcMapsTest, MissingFields) {
   static const char* const kTestCases[] = {
     "00400000\n",                               // Missing end + beyond.
     "00400000-0040b000\n",                      // Missing perms + beyond.
     "00400000-0040b000 r-xp\n",                 // Missing offset + beyond.
     "00400000-0040b000 r-xp 00000000\n",        // Missing device + beyond.
     "00400000-0040b000 r-xp 00000000 fc:00\n",  // Missing inode + beyond.
     "00400000-0040b000 00000000 fc:00 794418 /bin/cat\n",  // Missing perms.
     "00400000-0040b000 r-xp fc:00 794418 /bin/cat\n",      // Missing offset.
     "00400000-0040b000 r-xp 00000000 fc:00 /bin/cat\n",    // Missing inode.
     "00400000 r-xp 00000000 fc:00 794418 /bin/cat\n",      // Missing end.
     "-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n",     // Missing start.
     "00400000-0040b000 r-xp 00000000 794418 /bin/cat\n",   // Missing device.
   };

   for (size_t i = 0; i < arraysize(kTestCases); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
     std::vector<MappedMemoryRegion> regions;
     EXPECT_FALSE(ParseProcMaps(kTestCases[i], &regions));
   }
 }

 TEST(ProcMapsTest, InvalidInput) {
   static const char* const kTestCases[] = {
     "thisisal-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
     "0040000d-linvalid rwxp 00000000 fc:00 794418 /bin/cat\n",
     "00400000-0040b000 inpu 00000000 fc:00 794418 /bin/cat\n",
     "00400000-0040b000 rwxp tforproc fc:00 794418 /bin/cat\n",
     "00400000-0040b000 rwxp 00000000 ma:ps 794418 /bin/cat\n",
     "00400000-0040b000 rwxp 00000000 fc:00 parse! /bin/cat\n",
   };

   for (size_t i = 0; i < arraysize(kTestCases); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
     std::vector<MappedMemoryRegion> regions;
     EXPECT_FALSE(ParseProcMaps(kTestCases[i], &regions));
   }
 }

 TEST(ProcMapsTest, ParseProcMapsEmptyString) {
   std::vector<MappedMemoryRegion> regions;
   EXPECT_TRUE(ParseProcMaps("", &regions));
   EXPECT_EQ(0ULL, regions.size());
 }

 // Testing a couple of remotely possible weird things in the input:
 // - Line ending with \r\n or \n\r.
 // - File name contains quotes.
 // - File name has whitespaces.
 TEST(ProcMapsTest, ParseProcMapsWeirdCorrectInput) {
   std::vector<MappedMemoryRegion> regions;
   const std::string kContents =
     "00400000-0040b000 r-xp 00000000 fc:00 2106562 "
       "               /bin/cat\r\n"
     "7f53b7dad000-7f53b7f62000 r-xp 00000000 fc:00 263011 "
       "       /lib/x86_64-linux-gnu/libc-2.15.so\n\r"
     "7f53b816d000-7f53b818f000 r-xp 00000000 fc:00 264284 "
       "        /lib/x86_64-linux-gnu/ld-2.15.so\n"
     "7fff9c7ff000-7fff9c800000 r-xp 00000000 00:00 0 "
       "               \"vd so\"\n"
     "ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 "
       "               [vsys call]\n";
   EXPECT_TRUE(ParseProcMaps(kContents, &regions));
   EXPECT_EQ(5ULL, regions.size());
   EXPECT_EQ("/bin/cat", regions[0].path);
   EXPECT_EQ("/lib/x86_64-linux-gnu/libc-2.15.so", regions[1].path);
   EXPECT_EQ("/lib/x86_64-linux-gnu/ld-2.15.so", regions[2].path);
   EXPECT_EQ("\"vd so\"", regions[3].path);
   EXPECT_EQ("[vsys call]", regions[4].path);
 }

 }  // namespace debug
 }  // namespace base
	// Copyright (c) 2013 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "base/debug/proc_maps_linux.h"
	#include "base/files/file_path.h"
	#include "base/path_service.h"
	#include "base/strings/stringprintf.h"
	#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
	#include "base/threading/platform_thread.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace base {
	namespace debug {

	TEST(ProcMapsTest, Empty) {
	std::vector<MappedMemoryRegion> regions;
	EXPECT_TRUE(ParseProcMaps("", &regions));
	EXPECT_EQ(0u, regions.size());
	}

	TEST(ProcMapsTest, NoSpaces) {
	static const char kNoSpaces[] =
	"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kNoSpaces, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0x00400000u, regions[0].start);
	EXPECT_EQ(0x0040b000u, regions[0].end);
	EXPECT_EQ(0x00002200u, regions[0].offset);
	EXPECT_EQ("/bin/cat", regions[0].path);
	}

	TEST(ProcMapsTest, Spaces) {
	static const char kSpaces[] =
	"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/space cat\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kSpaces, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0x00400000u, regions[0].start);
	EXPECT_EQ(0x0040b000u, regions[0].end);
	EXPECT_EQ(0x00002200u, regions[0].offset);
	EXPECT_EQ("/bin/space cat", regions[0].path);
	}

	TEST(ProcMapsTest, NoNewline) {
	static const char kNoSpaces[] =
	"00400000-0040b000 r-xp 00002200 fc:00 794418 /bin/cat";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_FALSE(ParseProcMaps(kNoSpaces, &regions));
	}

	TEST(ProcMapsTest, NoPath) {
	static const char kNoPath[] =
	"00400000-0040b000 rw-p 00000000 00:00 0 \n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kNoPath, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0x00400000u, regions[0].start);
	EXPECT_EQ(0x0040b000u, regions[0].end);
	EXPECT_EQ(0x00000000u, regions[0].offset);
	EXPECT_EQ("", regions[0].path);
	}

	TEST(ProcMapsTest, Heap) {
	static const char kHeap[] =
	"022ac000-022cd000 rw-p 00000000 00:00 0 [heap]\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kHeap, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0x022ac000u, regions[0].start);
	EXPECT_EQ(0x022cd000u, regions[0].end);
	EXPECT_EQ(0x00000000u, regions[0].offset);
	EXPECT_EQ("[heap]", regions[0].path);
	}

	#if defined(ARCH_CPU_32_BITS)
	TEST(ProcMapsTest, Stack32) {
	static const char kStack[] =
	"beb04000-beb25000 rw-p 00000000 00:00 0 [stack]\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kStack, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0xbeb04000u, regions[0].start);
	EXPECT_EQ(0xbeb25000u, regions[0].end);
	EXPECT_EQ(0x00000000u, regions[0].offset);
	EXPECT_EQ("[stack]", regions[0].path);
	}
	#elif defined(ARCH_CPU_64_BITS)
	TEST(ProcMapsTest, Stack64) {
	static const char kStack[] =
	"7fff69c5b000-7fff69c7d000 rw-p 00000000 00:00 0 [stack]\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kStack, &regions));
	ASSERT_EQ(1u, regions.size());

	EXPECT_EQ(0x7fff69c5b000u, regions[0].start);
	EXPECT_EQ(0x7fff69c7d000u, regions[0].end);
	EXPECT_EQ(0x00000000u, regions[0].offset);
	EXPECT_EQ("[stack]", regions[0].path);
	}
	#endif

	TEST(ProcMapsTest, Multiple) {
	static const char kMultiple[] =
	"00400000-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n"
	"0060a000-0060b000 r--p 0000a000 fc:00 794418 /bin/cat\n"
	"0060b000-0060c000 rw-p 0000b000 fc:00 794418 /bin/cat\n";

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(kMultiple, &regions));
	ASSERT_EQ(3u, regions.size());

	EXPECT_EQ(0x00400000u, regions[0].start);
	EXPECT_EQ(0x0040b000u, regions[0].end);
	EXPECT_EQ(0x00000000u, regions[0].offset);
	EXPECT_EQ("/bin/cat", regions[0].path);

	EXPECT_EQ(0x0060a000u, regions[1].start);
	EXPECT_EQ(0x0060b000u, regions[1].end);
	EXPECT_EQ(0x0000a000u, regions[1].offset);
	EXPECT_EQ("/bin/cat", regions[1].path);

	EXPECT_EQ(0x0060b000u, regions[2].start);
	EXPECT_EQ(0x0060c000u, regions[2].end);
	EXPECT_EQ(0x0000b000u, regions[2].offset);
	EXPECT_EQ("/bin/cat", regions[2].path);
	}

	TEST(ProcMapsTest, Permissions) {
	static struct {
	const char* input;
	uint8 permissions;
	} kTestCases[] = {
	{"00400000-0040b000 ---s 00000000 fc:00 794418 /bin/cat\n", 0},
	{"00400000-0040b000 ---S 00000000 fc:00 794418 /bin/cat\n", 0},
	{"00400000-0040b000 r--s 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::READ},
	{"00400000-0040b000 -w-s 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::WRITE},
	{"00400000-0040b000 --xs 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::EXECUTE},
	{"00400000-0040b000 rwxs 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::READ \| MappedMemoryRegion::WRITE \|
	MappedMemoryRegion::EXECUTE},
	{"00400000-0040b000 ---p 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::PRIVATE},
	{"00400000-0040b000 r--p 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::READ \| MappedMemoryRegion::PRIVATE},
	{"00400000-0040b000 -w-p 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::WRITE \| MappedMemoryRegion::PRIVATE},
	{"00400000-0040b000 --xp 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::EXECUTE \| MappedMemoryRegion::PRIVATE},
	{"00400000-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
	MappedMemoryRegion::READ \| MappedMemoryRegion::WRITE \|
	MappedMemoryRegion::EXECUTE \| MappedMemoryRegion::PRIVATE},
	};

	for (size_t i = 0; i < arraysize(kTestCases); ++i) {
	SCOPED_TRACE(
	base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i].input));

	std::vector<MappedMemoryRegion> regions;
	EXPECT_TRUE(ParseProcMaps(kTestCases[i].input, &regions));
	EXPECT_EQ(1u, regions.size());
	if (regions.empty())
	continue;
	EXPECT_EQ(kTestCases[i].permissions, regions[0].permissions);
	}
	}

	#if defined(ADDRESS_SANITIZER)
	// AddressSanitizer may move local variables to a dedicated "fake stack" which
	// is outside the stack region listed in /proc/self/maps. We disable ASan
	// instrumentation for this function to force the variable to be local.
	__attribute__((no_sanitize_address))
	#endif
	void CheckProcMapsRegions(const std::vector<MappedMemoryRegion> &regions) {
	// We should be able to find both the current executable as well as the stack
	// mapped into memory. Use the address of \|exe_path\| as a way of finding the
	// stack.
	FilePath exe_path;
	EXPECT_TRUE(PathService::Get(FILE_EXE, &exe_path));
	uintptr_t address = reinterpret_cast<uintptr_t>(&exe_path);
	bool found_exe = false;
	bool found_stack = false;
	bool found_address = false;

	for (size_t i = 0; i < regions.size(); ++i) {
	if (regions[i].path == exe_path.value()) {
	// It's OK to find the executable mapped multiple times as there'll be
	// multiple sections (e.g., text, data).
	found_exe = true;
	}

	// Valgrind uses its own allocated stacks instead of the kernel-provided
	// stack without letting the kernel know via prctl(PR_SET_MM_START_STACK).
	// Depending on which kernel you're running it'll impact the output of
	// /proc/self/maps.
	//
	// Prior to version 3.4, the kernel completely ignores other stacks and
	// always prints out the vma lying within mm->start_stack as [stack] even
	// if the program was currently executing on a different stack.
	//
	// Starting in 3.4, the kernel will print out the vma containing the current
	// stack pointer as [stack:TID] as long as that vma does not lie within
	// mm->start_stack.
	//
	// Because this has gotten too complicated and brittle of a test, completely
	// ignore checking for the stack and address when running under Valgrind.
	// See http://crbug.com/431702 for more details.
	if (!RunningOnValgrind() && regions[i].path == "[stack]") {
	EXPECT_GE(address, regions[i].start);
	EXPECT_LT(address, regions[i].end);
	EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::READ);
	EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::WRITE);
	EXPECT_FALSE(regions[i].permissions & MappedMemoryRegion::EXECUTE);
	EXPECT_TRUE(regions[i].permissions & MappedMemoryRegion::PRIVATE);
	EXPECT_FALSE(found_stack) << "Found duplicate stacks";
	found_stack = true;
	}

	if (address >= regions[i].start && address < regions[i].end) {
	EXPECT_FALSE(found_address) << "Found same address in multiple regions";
	found_address = true;
	}
	}

	EXPECT_TRUE(found_exe);
	if (!RunningOnValgrind()) {
	EXPECT_TRUE(found_stack);
	EXPECT_TRUE(found_address);
	}
	}

	TEST(ProcMapsTest, ReadProcMaps) {
	std::string proc_maps;
	ASSERT_TRUE(ReadProcMaps(&proc_maps));

	std::vector<MappedMemoryRegion> regions;
	ASSERT_TRUE(ParseProcMaps(proc_maps, &regions));
	ASSERT_FALSE(regions.empty());

	CheckProcMapsRegions(regions);
	}

	TEST(ProcMapsTest, ReadProcMapsNonEmptyString) {
	std::string old_string("I forgot to clear the string");
	std::string proc_maps(old_string);
	ASSERT_TRUE(ReadProcMaps(&proc_maps));
	EXPECT_EQ(std::string::npos, proc_maps.find(old_string));
	}

	TEST(ProcMapsTest, MissingFields) {
	static const char* const kTestCases[] = {
	"00400000\n", // Missing end + beyond.
	"00400000-0040b000\n", // Missing perms + beyond.
	"00400000-0040b000 r-xp\n", // Missing offset + beyond.
	"00400000-0040b000 r-xp 00000000\n", // Missing device + beyond.
	"00400000-0040b000 r-xp 00000000 fc:00\n", // Missing inode + beyond.
	"00400000-0040b000 00000000 fc:00 794418 /bin/cat\n", // Missing perms.
	"00400000-0040b000 r-xp fc:00 794418 /bin/cat\n", // Missing offset.
	"00400000-0040b000 r-xp 00000000 fc:00 /bin/cat\n", // Missing inode.
	"00400000 r-xp 00000000 fc:00 794418 /bin/cat\n", // Missing end.
	"-0040b000 r-xp 00000000 fc:00 794418 /bin/cat\n", // Missing start.
	"00400000-0040b000 r-xp 00000000 794418 /bin/cat\n", // Missing device.
	};

	for (size_t i = 0; i < arraysize(kTestCases); ++i) {
	SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
	std::vector<MappedMemoryRegion> regions;
	EXPECT_FALSE(ParseProcMaps(kTestCases[i], &regions));
	}
	}

	TEST(ProcMapsTest, InvalidInput) {
	static const char* const kTestCases[] = {
	"thisisal-0040b000 rwxp 00000000 fc:00 794418 /bin/cat\n",
	"0040000d-linvalid rwxp 00000000 fc:00 794418 /bin/cat\n",
	"00400000-0040b000 inpu 00000000 fc:00 794418 /bin/cat\n",
	"00400000-0040b000 rwxp tforproc fc:00 794418 /bin/cat\n",
	"00400000-0040b000 rwxp 00000000 ma:ps 794418 /bin/cat\n",
	"00400000-0040b000 rwxp 00000000 fc:00 parse! /bin/cat\n",
	};

	for (size_t i = 0; i < arraysize(kTestCases); ++i) {
	SCOPED_TRACE(base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i]));
	std::vector<MappedMemoryRegion> regions;
	EXPECT_FALSE(ParseProcMaps(kTestCases[i], &regions));
	}
	}

	TEST(ProcMapsTest, ParseProcMapsEmptyString) {
	std::vector<MappedMemoryRegion> regions;
	EXPECT_TRUE(ParseProcMaps("", &regions));
	EXPECT_EQ(0ULL, regions.size());
	}

	// Testing a couple of remotely possible weird things in the input:
	// - Line ending with \r\n or \n\r.
	// - File name contains quotes.
	// - File name has whitespaces.
	TEST(ProcMapsTest, ParseProcMapsWeirdCorrectInput) {
	std::vector<MappedMemoryRegion> regions;
	const std::string kContents =
	"00400000-0040b000 r-xp 00000000 fc:00 2106562 "
	" /bin/cat\r\n"
	"7f53b7dad000-7f53b7f62000 r-xp 00000000 fc:00 263011 "
	" /lib/x86_64-linux-gnu/libc-2.15.so\n\r"
	"7f53b816d000-7f53b818f000 r-xp 00000000 fc:00 264284 "
	" /lib/x86_64-linux-gnu/ld-2.15.so\n"
	"7fff9c7ff000-7fff9c800000 r-xp 00000000 00:00 0 "
	" \"vd so\"\n"
	"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 "
	" [vsys call]\n";
	EXPECT_TRUE(ParseProcMaps(kContents, &regions));
	EXPECT_EQ(5ULL, regions.size());
	EXPECT_EQ("/bin/cat", regions[0].path);
	EXPECT_EQ("/lib/x86_64-linux-gnu/libc-2.15.so", regions[1].path);
	EXPECT_EQ("/lib/x86_64-linux-gnu/ld-2.15.so", regions[2].path);
	EXPECT_EQ("\"vd so\"", regions[3].path);
	EXPECT_EQ("[vsys call]", regions[4].path);
	}

	} // namespace debug
	} // namespace base