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Add runtime checks

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This commit is contained in:
Jethro Grassie 2021-11-12 20:07:36 -05:00
parent c7973839fa
commit 31b9b0f8fc
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GPG Key ID: DE8ED755616565BB
1 changed files with 17 additions and 11 deletions
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src/virtual_memory.cpp
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@ -36,12 +36,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifdef __APPLE__
#include <mach/vm_statistics.h>
#include <TargetConditionals.h>
#include <AvailabilityMacros.h>
# if TARGET_OS_OSX
# if TARGET_CPU_ARM64
# define USE_PTHREAD_JIT_WP 1
# else
# undef USE_PTHREAD_JIT_WP
# endif
# define USE_PTHREAD_JIT_WP 1
# include <pthread.h>
# endif
#endif
@ -118,8 +115,11 @@ void* allocMemoryPages(std::size_t bytes) {
mem = mmap(nullptr, bytes, PAGE_READWRITE | RESERVED_FLAGS | PEXTRA, MAP_ANONYMOUS | MAP_PRIVATE | MEXTRA, -1, 0);
if (mem == MAP_FAILED)
throw std::runtime_error("allocMemoryPages - mmap failed");
#ifdef USE_PTHREAD_JIT_WP
pthread_jit_write_protect_np(false);
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(false);
}
#endif
#endif
return mem;
@ -138,16 +138,22 @@ static inline void pageProtect(void* ptr, std::size_t bytes, int rules) {
}
void setPagesRW(void* ptr, std::size_t bytes) {
#ifdef USE_PTHREAD_JIT_WP
pthread_jit_write_protect_np(false);
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(false);
}
#else
pageProtect(ptr, bytes, PAGE_READWRITE);
#endif
}
void setPagesRX(void* ptr, std::size_t bytes) {
#ifdef USE_PTHREAD_JIT_WP
pthread_jit_write_protect_np(true);
#if defined(USE_PTHREAD_JIT_WP) && defined(MAC_OS_VERSION_11_0) \
&& MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
if (__builtin_available(macOS 11.0, *)) {
pthread_jit_write_protect_np(true);
}
#else
pageProtect(ptr, bytes, PAGE_EXECUTE_READ);
#endif