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[ASan] On Darwin record global allocator pointer and size in introspection struct. 

This implements `mi_extra_init(...)` for the ASan allocator on
Darwin and uses the `__lsan::GetAllocatorGlobalRange(...)` function
to retrieve the allocator pointer and size.

rdar://problem/45284065

llvm-svn: 351713
This commit is contained in:
Dan Liew 2019-01-21 01:41:12 +00:00
parent 5a3857c9b2
commit a35df433bf
1 changed files with 17 additions and 1 deletions
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18
compiler-rt/lib/asan/asan_malloc_mac.cc
View File

@ -18,6 +18,7 @@
#include "asan_report.h"
#include "asan_stack.h"
#include "asan_stats.h"
#include "lsan/lsan_common.h"
using namespace __asan;
#define COMMON_MALLOC_ZONE_NAME "asan"
@ -58,11 +59,12 @@ using namespace __asan;
ReportMacMzReallocUnknown((uptr)ptr, (uptr)zone_ptr, zone_name, &stack);
#define COMMON_MALLOC_NAMESPACE __asan
#define COMMON_MALLOC_HAS_ZONE_ENUMERATOR 0
#define COMMON_MALLOC_HAS_EXTRA_INTROSPECTION_INIT 0
#define COMMON_MALLOC_HAS_EXTRA_INTROSPECTION_INIT 1
#include "sanitizer_common/sanitizer_malloc_mac.inc"
namespace COMMON_MALLOC_NAMESPACE {
bool HandleDlopenInit() {
static_assert(SANITIZER_SUPPORTS_INIT_FOR_DLOPEN,
"Expected SANITIZER_SUPPORTS_INIT_FOR_DLOPEN to be true");
@ -83,4 +85,18 @@ bool HandleDlopenInit() {
}
} // namespace COMMON_MALLOC_NAMESPACE
namespace {
void mi_extra_init(sanitizer_malloc_introspection_t *mi) {
uptr last_byte_plus_one = 0;
mi->allocator_ptr = 0;
// Range is [begin_ptr, end_ptr)
__lsan::GetAllocatorGlobalRange(&(mi->allocator_ptr), &last_byte_plus_one);
CHECK_NE(mi->allocator_ptr, 0);
CHECK_GT(last_byte_plus_one, mi->allocator_ptr);
mi->allocator_size = last_byte_plus_one - (mi->allocator_ptr);
CHECK_GT(mi->allocator_size, 0);
}
} // namespace
#endif