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posix: DCHECK for (addr + len) overflow in ScopedMmap::ResetAddrLen()

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This also enhances ScopedMmapDeathTest.Mprotect to better ensure that
ScopedMmap::Mprotect() works properly.

Bug: crashpad:30
Test: crashpad_util_test ScopedMmap*.*
Change-Id: Iff35dba9fa993086f3f4cd8f4a862d802e637bb1
Reviewed-on: https://chromium-review.googlesource.com/464547
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Mark Mentovai 2017-03-31 11:48:41 -04:00
parent aa2bc55777
commit 385fe6615f
2 changed files with 7 additions and 1 deletions
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2
util/posix/scoped_mmap.cc
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@ -19,6 +19,7 @@
#include <algorithm>
#include "base/logging.h"
#include "base/numerics/safe_math.h"
namespace {
@ -56,6 +57,7 @@ bool ScopedMmap::ResetAddrLen(void* addr, size_t len) {
DCHECK_NE(len, 0u);
DCHECK_EQ(new_addr % getpagesize(), 0u);
DCHECK_EQ(len % getpagesize(), 0u);
DCHECK((base::CheckedNumeric<uintptr_t>(new_addr) + (len - 1)).IsValid());
}
bool result = true;

6
util/posix/scoped_mmap_test.cc
View File

@ -302,11 +302,15 @@ TEST(ScopedMmapDeathTest, Mprotect) {
EXPECT_EQ(kPageSize, mapping.len());
char* addr = mapping.addr_as<char*>();
*addr = 0;
*addr = 1;
ASSERT_TRUE(mapping.Mprotect(PROT_READ));
EXPECT_DEATH(*addr = 0, "");
ASSERT_TRUE(mapping.Mprotect(PROT_READ | PROT_WRITE));
EXPECT_EQ(1, *addr);
*addr = 2;
}
} // namespace