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Add guard pages to test stacks

Browse Source 
Bug: b:340659332
Change-Id: I4c2c82a1868d7a4f4a062a4e7a64258deedfb794
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/5542248
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Joshua Peraza 2024-05-16 09:08:18 -07:00 committed by Crashpad LUCI CQ
parent aef8303371
commit 0e043ccf70
1 changed files with 15 additions and 7 deletions
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22
snapshot/linux/process_reader_linux_test.cc
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@ -52,6 +52,7 @@
#include "util/misc/address_sanitizer.h"
#include "util/misc/from_pointer_cast.h"
#include "util/misc/memory_sanitizer.h"
#include "util/posix/scoped_mmap.h"
#include "util/synchronization/semaphore.h"
#if BUILDFLAG(IS_ANDROID)
@ -180,14 +181,21 @@ class TestThreadPool {
<< ErrnoMessage("pthread_attr_init");
if (stack_size > 0) {
void* stack_ptr;
errno = posix_memalign(&stack_ptr, getpagesize(), stack_size);
ASSERT_EQ(errno, 0) << ErrnoMessage("posix_memalign");
const size_t page_size = getpagesize();
DCHECK_EQ(stack_size % page_size, 0u);
size_t stack_alloc_size = 2 * page_size + stack_size;
thread->stack.reset(reinterpret_cast<char*>(stack_ptr));
ASSERT_TRUE(thread->stack.ResetMmap(nullptr,
stack_alloc_size,
PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1,
0));
char* stack_ptr = thread->stack.addr_as<char*>() + page_size;
ASSERT_EQ(mprotect(stack_ptr, stack_size, PROT_READ | PROT_WRITE), 0)
<< "mprotect";
ASSERT_EQ(pthread_attr_setstack(&attr, thread->stack.get(), stack_size),
0)
ASSERT_EQ(pthread_attr_setstack(&attr, stack_ptr, stack_size), 0)
<< ErrnoMessage("pthread_attr_setstack");
thread->expectation.max_stack_size = stack_size;
}
@ -238,7 +246,7 @@ class TestThreadPool {
pthread_t pthread;
ThreadExpectation expectation;
std::unique_ptr<char[], base::FreeDeleter> stack;
ScopedMmap stack;
Semaphore ready_semaphore;
Semaphore exit_semaphore;
pid_t tid;