diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/mach/readonly-area.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/mach/readonly-area.c b/sysdeps/mach/readonly-area.c new file mode 100644 index 0000000000..afee7a4bde --- /dev/null +++ b/sysdeps/mach/readonly-area.c @@ -0,0 +1,57 @@ +/* Test if a memory region is wholly unwritable. Mach version. + Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <stdlib.h> +#include <stdint.h> +#include <mach.h> + +/* Return 1 if the whole area PTR .. PTR+SIZE is not writable. + Return -1 if it is writable. */ + +int +__readonly_area (const char *ptr, size_t size) +{ + vm_address_t region_address = (uintptr_t) ptr; + vm_size_t region_length = size; + vm_prot_t protection; + vm_prot_t max_protection; + vm_inherit_t inheritance; + boolean_t is_shared; + mach_port_t object_name; + vm_offset_t offset; + + while (__vm_region (__mach_task_self (), + ®ion_address, ®ion_length, + &protection, &max_protection, &inheritance, &is_shared, + &object_name, &offset) == KERN_SUCCESS + && region_address <= (uintptr_t) ptr) + { + region_address += region_length; + if (region_address < (uintptr_t) ptr) + continue; + + if (protection & VM_PROT_WRITE) + return -1; + + if (region_address - (uintptr_t) ptr >= size) + break; + } + + return 1; +} |