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guard metadata with Memory Protection Keys (MPK)

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Daniel Micay 2018-10-19 21:29:40 -04:00
parent ac8c68de53
commit 0b963078d5
6 changed files with 126 additions and 18 deletions
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18
memory.c
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@ -35,20 +35,28 @@ int memory_unmap(void *ptr, size_t size) {
return ret;
}
static int memory_protect_prot(void *ptr, size_t size, int prot) {
static int memory_protect_prot(void *ptr, size_t size, int prot, UNUSED int pkey) {
#ifdef USE_PKEY
int ret = pkey_mprotect(ptr, size, prot, pkey);
#else
int ret = mprotect(ptr, size, prot);
#endif
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, -1);
}
int memory_protect_ro(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ);
int memory_protect_rw(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ|PROT_WRITE, -1);
}
int memory_protect_rw_metadata(void *ptr, size_t size) {
return memory_protect_prot(ptr, size, PROT_READ|PROT_WRITE, get_metadata_key());
}
int memory_remap(void *old, size_t old_size, size_t new_size) {