Split Mprotect into MmapNoAccess and MprotectNoAccess to be more portable

On Windows, we have to know if a memory to be protected is mapped or not.
On POSIX, Mprotect was semantically different from mprotect most people know.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@234602 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/sanitizer_common/sanitizer_posix.cc b/lib/sanitizer_common/sanitizer_posix.cc
index f3ae613de..0b6d35eb1 100644
--- a/lib/sanitizer_common/sanitizer_posix.cc
+++ b/lib/sanitizer_common/sanitizer_posix.cc
@@ -199,13 +199,17 @@ void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
   return (void *)p;
 }
 
-void *Mprotect(uptr fixed_addr, uptr size) {
+void *MmapNoAccess(uptr fixed_addr, uptr size) {
   return (void *)internal_mmap((void*)fixed_addr, size,
                                PROT_NONE,
                                MAP_PRIVATE | MAP_ANON | MAP_FIXED |
                                MAP_NORESERVE, -1, 0);
 }
 
+bool MprotectNoAccess(uptr addr, uptr size) {
+  return 0 == internal_mprotect((void*)addr, size, PROT_NONE);
+}
+
 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *errno_p) {
   int flags;
   switch (mode) {