diff options
Diffstat (limited to 'lldb/source/Core/DataBufferMemoryMap.cpp')
| -rw-r--r-- | lldb/source/Core/DataBufferMemoryMap.cpp | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/lldb/source/Core/DataBufferMemoryMap.cpp b/lldb/source/Core/DataBufferMemoryMap.cpp index fd8db63c8a7..48fe9e58d07 100644 --- a/lldb/source/Core/DataBufferMemoryMap.cpp +++ b/lldb/source/Core/DataBufferMemoryMap.cpp @@ -14,8 +14,29 @@ #include "lldb/Host/windows/windows.h" #else #include <sys/mman.h> -#endif +#define MAP_EXTRA_HOST_READ_FLAGS 0 + +#if defined (__APPLE__) +//---------------------------------------------------------------------- +// Newer versions of MacOSX have a flag that will allow us to read from +// binaries whose code signature is invalid without crashing by using +// the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media +// is mapped we can avoid crashing and return zeroes to any pages we try +// to read if the media becomes unavailable by using the +// MAP_RESILIENT_MEDIA flag. +//---------------------------------------------------------------------- +#if defined(MAP_RESILIENT_CODESIGN) + #undef MAP_EXTRA_HOST_READ_FLAGS + #if defined(MAP_RESILIENT_MEDIA) + #define MAP_EXTRA_HOST_READ_FLAGS MAP_RESILIENT_CODESIGN | MAP_RESILIENT_MEDIA + #else + #define MAP_EXTRA_HOST_READ_FLAGS MAP_RESILIENT_CODESIGN + #endif +#endif // #if defined(MAP_RESILIENT_CODESIGN) +#endif // #if defined (__APPLE__) + +#endif // #else #ifdef _WIN32 // C++ Includes #include <cerrno> #include <climits> @@ -255,10 +276,12 @@ DataBufferMemoryMap::MemoryMapFromFileDescriptor (int fd, if (length > 0) { int prot = PROT_READ; + int flags = MAP_PRIVATE; if (writeable) prot |= PROT_WRITE; + else + flags |= MAP_EXTRA_HOST_READ_FLAGS; - int flags = MAP_PRIVATE; if (fd_is_file) flags |= MAP_FILE; |
