diff options
Diffstat (limited to 'winsup/cygwin/mmap.cc')
| -rw-r--r-- | winsup/cygwin/mmap.cc | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/winsup/cygwin/mmap.cc b/winsup/cygwin/mmap.cc index 57bd82795..dae80e4d6 100644 --- a/winsup/cygwin/mmap.cc +++ b/winsup/cygwin/mmap.cc @@ -98,6 +98,7 @@ class mmap_record __off64_t map_map (__off64_t off, DWORD len); BOOL unmap_map (caddr_t addr, DWORD len); void fixup_map (void); + int access (char *address); fhandler_base *alloc_fh (); void free_fh (fhandler_base *fh); @@ -219,6 +220,15 @@ mmap_record::fixup_map () &old_prot); } +int +mmap_record::access (char *address) +{ + if (address < base_address_ || address >= base_address_ + size_to_map_) + return 0; + DWORD off = (address - base_address_) / getpagesize (); + return MAP_ISSET (off); +} + static fhandler_disk_file fh_paging_file; fhandler_base * @@ -887,7 +897,7 @@ mprotect (caddr_t addr, size_t len, int prot) */ int __stdcall -fixup_mmaps_after_fork () +fixup_mmaps_after_fork (HANDLE parent) { debug_printf ("recreate_mmaps_after_fork, mmapped_areas %p", mmapped_areas); @@ -925,6 +935,20 @@ fixup_mmaps_after_fork () rec->get_address ()); return -1; } + if (rec->get_access () == FILE_MAP_COPY) + { + for (char *address = rec->get_address (); + address < rec->get_address () + rec->get_size (); + address += getpagesize ()) + if (rec->access (address) + && !ReadProcessMemory (parent, address, address, + getpagesize (), NULL)) + { + system_printf ("ReadProcessMemory failed for MAP_PRIVATE address %p, %E", + rec->get_address ()); + return -1; + } + } rec->fixup_map (); } } |