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Faster W^X policy for apple silicon macs

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This commit is contained in:
Howard Chu 2021-05-20 20:34:16 +01:00
parent 5bfd021e8f
commit d9b7e8c25d
1 changed files with 22 additions and 1 deletions
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23
src/virtual_memory.cpp
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@ -35,6 +35,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#else
#ifdef __APPLE__
#include <mach/vm_statistics.h>
#include <TargetConditionals.h>
# if defined(__aarch64__) && TARGET_OS_OSX
# define USE_PTHREAD_JIT_WP 1
# include <pthread.h>
# endif
#endif
#include <sys/types.h>
#include <sys/mman.h>
@ -109,9 +114,17 @@ void* allocMemoryPages(std::size_t bytes) {
#else
#define MEXTRA 0
#endif
mem = mmap(nullptr, bytes, PAGE_READWRITE | RESERVED_FLAGS, MAP_ANONYMOUS | MAP_PRIVATE | MEXTRA, -1, 0);
#ifdef USE_PTHREAD_JIT_WP
#define PEXTRA PROT_EXEC
#else
#define PEXTRA 0
#endif
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);
#endif
#endif
return mem;
}
@ -129,11 +142,19 @@ 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);
#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);
#else
pageProtect(ptr, bytes, PAGE_EXECUTE_READ);
#endif
}
void setPagesRWX(void* ptr, std::size_t bytes) {