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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/public/common/chrome_debug_urls.h"
#include "base/debug/alias.h"
#include "base/debug/asan_invalid_access.h"
#include "base/debug/dump_without_crashing.h"
#include "base/logging.h"
#include "base/process/process.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "third_party/blink/common/crash_helpers.h"
#include "third_party/blink/common/rust_crash/src/lib.rs.h"
#include "url/gurl.h"
#if BUILDFLAG(IS_WIN)
#include "base/debug/invalid_access_win.h"
#include "base/process/kill.h"
#elif BUILDFLAG(IS_POSIX)
#include <signal.h>
#elif BUILDFLAG(IS_FUCHSIA)
#include <zircon/syscalls.h>
#endif
namespace blink {
bool IsRendererDebugURL(const GURL& url) {
if (!url.is_valid())
return false;
if (url.SchemeIs(url::kJavaScriptScheme))
return true;
if (!url.SchemeIs("chrome"))
return false;
if (url == kChromeUICheckCrashURL || url == kChromeUIBadCastCrashURL ||
url == kChromeUICrashURL || url == kChromeUIDumpURL ||
url == kChromeUIKillURL || url == kChromeUIHangURL ||
url == kChromeUIShorthangURL || url == kChromeUIMemoryExhaustURL ||
url == kChromeUICrashRustURL) {
return true;
}
#if defined(ADDRESS_SANITIZER)
if (url == kChromeUICrashHeapOverflowURL ||
url == kChromeUICrashHeapUnderflowURL ||
url == kChromeUICrashUseAfterFreeURL ||
url == kChromeUICrashRustOverflowURL) {
return true;
}
#endif // defined(ADDRESS_SANITIZER)
#if BUILDFLAG(IS_WIN)
if (url == kChromeUICfgViolationCrashURL)
return true;
if (url == kChromeUIHeapCorruptionCrashURL)
return true;
#endif
#if DCHECK_IS_ON()
if (url == kChromeUICrashDcheckURL)
return true;
#endif
#if BUILDFLAG(IS_WIN) && defined(ADDRESS_SANITIZER)
if (url == kChromeUICrashCorruptHeapBlockURL ||
url == kChromeUICrashCorruptHeapURL) {
return true;
}
#endif
return false;
}
namespace {
// The following methods are outside of the anonymous namespace to ensure that
// the corresponding symbols get emitted even on symbol_level 1.
NOINLINE void ExhaustMemory() {
volatile void* ptr = nullptr;
do {
ptr = malloc(0x10000000);
base::debug::Alias(&ptr);
} while (ptr);
}
#if defined(ADDRESS_SANITIZER)
NOINLINE void MaybeTriggerAsanError(const GURL& url) {
// NOTE(rogerm): We intentionally perform an invalid heap access here in
// order to trigger an Address Sanitizer (ASAN) error report.
if (url == kChromeUICrashHeapOverflowURL) {
LOG(ERROR) << "Intentionally causing ASAN heap overflow"
<< " because user navigated to " << url.spec();
base::debug::AsanHeapOverflow();
} else if (url == kChromeUICrashHeapUnderflowURL) {
LOG(ERROR) << "Intentionally causing ASAN heap underflow"
<< " because user navigated to " << url.spec();
base::debug::AsanHeapUnderflow();
} else if (url == kChromeUICrashUseAfterFreeURL) {
LOG(ERROR) << "Intentionally causing ASAN heap use-after-free"
<< " because user navigated to " << url.spec();
base::debug::AsanHeapUseAfterFree();
#if BUILDFLAG(IS_WIN)
} else if (url == kChromeUICrashCorruptHeapBlockURL) {
LOG(ERROR) << "Intentionally causing ASAN corrupt heap block"
<< " because user navigated to " << url.spec();
base::debug::AsanCorruptHeapBlock();
} else if (url == kChromeUICrashCorruptHeapURL) {
LOG(ERROR) << "Intentionally causing ASAN corrupt heap"
<< " because user navigated to " << url.spec();
base::debug::AsanCorruptHeap();
#endif // BUILDFLAG(IS_WIN)
} else if (url == kChromeUICrashRustOverflowURL) {
// Ensure that ASAN works even in Rust code.
LOG(ERROR) << "Intentionally causing ASAN heap overflow in Rust"
<< " because user navigated to " << url.spec();
crash_in_rust_with_overflow();
}
}
#endif // ADDRESS_SANITIZER
} // namespace
void HandleChromeDebugURL(const GURL& url) {
DCHECK(IsRendererDebugURL(url) && !url.SchemeIs("javascript"));
if (url == kChromeUIBadCastCrashURL) {
LOG(ERROR) << "Intentionally crashing (with bad cast)"
<< " because user navigated to " << url.spec();
internal::BadCastCrashIntentionally();
} else if (url == kChromeUICrashURL) {
LOG(ERROR) << "Intentionally crashing (with null pointer dereference)"
<< " because user navigated to " << url.spec();
internal::CrashIntentionally();
} else if (url == kChromeUICrashRustURL) {
// Cause a typical crash in Rust code, so we can test that call stack
// collection and symbol mangling work across the language boundary.
crash_in_rust();
} else if (url == kChromeUIDumpURL) {
// This URL will only correctly create a crash dump file if content is
// hosted in a process that has correctly called
// base::debug::SetDumpWithoutCrashingFunction. Refer to the documentation
// of base::debug::DumpWithoutCrashing for more details.
base::debug::DumpWithoutCrashing();
} else if (url == kChromeUIKillURL) {
LOG(ERROR) << "Intentionally terminating current process because user"
" navigated to "
<< url.spec();
// Simulate termination such that the base::GetTerminationStatus() API will
// return TERMINATION_STATUS_PROCESS_WAS_KILLED.
#if BUILDFLAG(IS_WIN)
base::Process::TerminateCurrentProcessImmediately(
base::win::kProcessKilledExitCode);
#elif BUILDFLAG(IS_POSIX)
PCHECK(kill(base::Process::Current().Pid(), SIGTERM) == 0);
#elif BUILDFLAG(IS_FUCHSIA)
zx_process_exit(ZX_TASK_RETCODE_SYSCALL_KILL);
#else
#error Unsupported platform
#endif
} else if (url == kChromeUIHangURL) {
LOG(ERROR) << "Intentionally hanging ourselves with sleep infinite loop"
<< " because user navigated to " << url.spec();
for (;;) {
base::PlatformThread::Sleep(base::Seconds(1));
}
} else if (url == kChromeUIShorthangURL) {
LOG(ERROR) << "Intentionally sleeping renderer for 20 seconds"
<< " because user navigated to " << url.spec();
base::PlatformThread::Sleep(base::Seconds(20));
} else if (url == kChromeUIMemoryExhaustURL) {
LOG(ERROR)
<< "Intentionally exhausting renderer memory because user navigated to "
<< url.spec();
ExhaustMemory();
} else if (url == kChromeUICheckCrashURL) {
LOG(ERROR) << "Intentionally causing CHECK because user navigated to "
<< url.spec();
CHECK(false);
}
#if BUILDFLAG(IS_WIN)
if (url == kChromeUICfgViolationCrashURL) {
LOG(ERROR) << "Intentionally causing cfg crash because user navigated to "
<< url.spec();
base::debug::win::TerminateWithControlFlowViolation();
}
if (url == kChromeUIHeapCorruptionCrashURL) {
LOG(ERROR)
<< "Intentionally causing heap corruption because user navigated to "
<< url.spec();
base::debug::win::TerminateWithHeapCorruption();
}
#endif
#if DCHECK_IS_ON()
if (url == kChromeUICrashDcheckURL) {
LOG(ERROR) << "Intentionally causing DCHECK because user navigated to "
<< url.spec();
DCHECK(false) << "Intentional DCHECK.";
}
#endif
#if defined(ADDRESS_SANITIZER)
MaybeTriggerAsanError(url);
#endif // ADDRESS_SANITIZER
}
} // namespace blink
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