emo/hardened_malloc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

avoid undefined shifts with multi-word bitmaps

Browse Source
This commit is contained in:
Daniel Micay 2018-10-14 18:57:59 -04:00
parent 7798b2693e
commit 535466fdfd
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
malloc.c
View File

@ -199,15 +199,18 @@ static struct slab_metadata *alloc_metadata(struct size_class *c, size_t slab_si
}
static void set_slot(struct slab_metadata *metadata, size_t index) {
metadata->bitmap[index / 64] |= 1UL << index;
size_t bucket = index / 64;
metadata->bitmap[bucket] |= 1UL << (index - bucket * 64);
}
static void clear_slot(struct slab_metadata *metadata, size_t index) {
metadata->bitmap[index / 64] &= ~(1UL << index);
size_t bucket = index / 64;
metadata->bitmap[bucket] &= ~(1UL << (index - bucket * 64));
}
static bool get_slot(struct slab_metadata *metadata, size_t index) {
return (metadata->bitmap[index / 64] >> index) & 1UL;
size_t bucket = index / 64;
return (metadata->bitmap[bucket] >> (index - bucket * 64)) & 1UL;
}
static u64 get_mask(size_t slots) {