hardened_malloc/memory.c
2018-08-29 13:04:52 -04:00

64 lines
1.6 KiB
C

#include <errno.h>
#include <sys/mman.h>
#include "memory.h"
#include "util.h"
void *memory_map(size_t size) {
void *p = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (unlikely(p == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM mmap failure");
}
return NULL;
}
return p;
}
int memory_map_fixed(void *ptr, size_t size) {
void *p = mmap(ptr, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_FIXED, -1, 0);
if (unlikely(p == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM mmap failure");
}
return 1;
}
return 0;
}
int memory_unmap(void *ptr, size_t size) {
int ret = munmap(ptr, size);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM munmap failure");
}
return ret;
}
static int memory_protect_prot(void *ptr, size_t size, int prot) {
int ret = mprotect(ptr, size, prot);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM mprotect failure");
}
return ret;
}
int memory_protect_rw(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ|PROT_WRITE);
}
int memory_protect_ro(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ);
}
int memory_remap_fixed(void *old, size_t old_size, void *new, size_t new_size) {
void *ptr = mremap(old, old_size, new_size, MREMAP_MAYMOVE|MREMAP_FIXED, new);
if (unlikely(ptr == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM mremap failure");
}
return 1;
}
return 0;
}