diff options
| -rw-r--r-- | common/dlmalloc.c | 7 | ||||
| -rw-r--r-- | common/mcheck_core.inc.h | 20 |
2 files changed, 24 insertions, 3 deletions
diff --git a/common/dlmalloc.c b/common/dlmalloc.c index 8de15d7..73c04af 100644 --- a/common/dlmalloc.c +++ b/common/dlmalloc.c @@ -2265,7 +2265,12 @@ Void_t *rEALLOc(Void_t *oldmem, size_t bytes) Void_t *mEMALIGn(size_t alignment, size_t bytes) { - return NULL; + size_t fullsz = mcheck_memalign_prehook(alignment, bytes); + void *p = mEMALIGn_impl(alignment, fullsz); + + if (!p) + return p; + return mcheck_memalign_posthook(alignment, p, bytes); } // pvALLOc, vALLOc - redirect to mEMALIGn, defined here, so they need no wrapping. diff --git a/common/mcheck_core.inc.h b/common/mcheck_core.inc.h index 6f26ef0..b038bb0 100644 --- a/common/mcheck_core.inc.h +++ b/common/mcheck_core.inc.h @@ -69,6 +69,7 @@ typedef struct { } mcheck_canary; struct mcheck_hdr { size_t size; /* Exact size requested by user. */ + size_t aln_skip; /* Ignored bytes, before the mcheck_hdr, to fulfill alignment */ mcheck_canary canary; /* Magic number to check header integrity. */ }; @@ -104,6 +105,7 @@ static inline size_t allign_size_up(size_t sz, size_t grain) } #define mcheck_allign_customer_size(SZ) allign_size_up(SZ, sizeof(mcheck_elem)) +#define mcheck_evaluate_memalign_prefix_size(ALIGN) allign_size_up(sizeof(struct mcheck_hdr), ALIGN) static enum mcheck_status mcheck_OnNok(enum mcheck_status status) { @@ -156,7 +158,8 @@ static void *mcheck_free_helper(void *ptr, int clean_content) if (clean_content) mcheck_flood(ptr, FREEFLOOD, mcheck_allign_customer_size(hdr->size)); - return hdr; + + return (char *)hdr - hdr->aln_skip; } static void *mcheck_free_prehook(void *ptr) { return mcheck_free_helper(ptr, CLEAN_CONTENT); } @@ -171,10 +174,13 @@ static size_t mcheck_alloc_prehook(size_t sz) static void *mcheck_allocated_helper(void *altoghether_ptr, size_t customer_sz, size_t alignment, int clean_content) { - struct mcheck_hdr *hdr = (struct mcheck_hdr *)altoghether_ptr; + const size_t slop = alignment ? + mcheck_evaluate_memalign_prefix_size(alignment) - sizeof(struct mcheck_hdr) : 0; + struct mcheck_hdr *hdr = (struct mcheck_hdr *)((char *)altoghether_ptr + slop); int i; hdr->size = customer_sz; + hdr->aln_skip = slop; for (i = 0; i < CANARY_DEPTH; ++i) hdr->canary.elems[i] = MAGICWORD; @@ -204,6 +210,16 @@ static void *mcheck_alloc_noclean_posthook(void *altoghether_ptr, size_t custome return mcheck_allocated_helper(altoghether_ptr, customer_sz, ANY_ALIGNMENT, KEEP_CONTENT); } +static size_t mcheck_memalign_prehook(size_t alig, size_t sz) +{ + return mcheck_evaluate_memalign_prefix_size(alig) + sz + sizeof(mcheck_canary); +} + +static void *mcheck_memalign_posthook(size_t alignment, void *altoghether_ptr, size_t customer_sz) +{ + return mcheck_allocated_helper(altoghether_ptr, customer_sz, alignment, CLEAN_CONTENT); +} + static enum mcheck_status mcheck_mprobe(void *ptr) { struct mcheck_hdr *hdr = &((struct mcheck_hdr *)ptr)[-1]; |