jmb/hardened_malloc
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override memcpy and perform sanity checks

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Signed-off-by: Tavi <tavi@divested.dev>
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Tavi 2025-03-21 18:49:36 -04:00
parent 4fe9018b6f
commit 39b1b13bce
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GPG key ID: E599F62ECBAEAF2E
2 changed files with 23 additions and 0 deletions
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21
h_malloc.c
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@ -1874,6 +1874,27 @@ EXPORT size_t h_malloc_object_size_fast(const void *p) {
return SIZE_MAX;
}
EXPORT void *h_memcpy(void *dst, const void *src, size_t len) {
if (len > malloc_object_size(src)) {
fatal_error("memcpy: length greater than source");
}
if (len > malloc_object_size(dst)) {
fatal_error("memcpy: destination too small");
}
if (dst == src) {
return dst;
}
char *d = (char *)dst;
const char *s = (const char *)src;
for (size_t i = 0; i < len; ++i) {
d[i] = s[i];
}
return dst;
}
EXPORT int h_mallopt(UNUSED int param, UNUSED int value) {
#ifdef __ANDROID__
if (param == M_PURGE) {

2
include/h_malloc.h
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@ -15,6 +15,7 @@ extern "C" {
#define h_realloc realloc
#define h_aligned_alloc aligned_alloc
#define h_free free
#define h_memcpy memcpy
#define h_posix_memalign posix_memalign
@ -54,6 +55,7 @@ __attribute__((alloc_size(2))) void *h_realloc(void *ptr, size_t size);
__attribute__((malloc)) __attribute__((alloc_size(2))) __attribute__((alloc_align(1)))
void *h_aligned_alloc(size_t alignment, size_t size);
void h_free(void *ptr);
void *h_memcpy(void *dstpp, const void *srcpp, size_t len);
// POSIX
int h_posix_memalign(void **memptr, size_t alignment, size_t size);