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malloc: Use accessors for chunk metadata access

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This change allows us to change the encoding of these struct members
in a centralized fashion.
This commit is contained in:
Florian Weimer
2016-10-28 16:26:57 +02:00
parent 4725d33eed
commit e9c4fe93b3
4 changed files with 127 additions and 70 deletions
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8
malloc/hooks.c
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@ -192,7 +192,7 @@ mem2chunk_check (void *mem, unsigned char **magic_p)
((char *) p < mp_.sbrk_base ||
((char *) p + sz) >= (mp_.sbrk_base + main_arena.system_mem))) ||
sz < MINSIZE || sz & MALLOC_ALIGN_MASK || !inuse (p) ||
(!prev_inuse (p) && (p->prev_size & MALLOC_ALIGN_MASK ||
(!prev_inuse (p) && ((prev_size (p) & MALLOC_ALIGN_MASK) != 0 ||
(contig && (char *) prev_chunk (p) < mp_.sbrk_base) ||
next_chunk (prev_chunk (p)) != p)))
return NULL;
@ -215,9 +215,9 @@ mem2chunk_check (void *mem, unsigned char **magic_p)
offset != 0x20 && offset != 0x40 && offset != 0x80 && offset != 0x100 &&
offset != 0x200 && offset != 0x400 && offset != 0x800 && offset != 0x1000 &&
offset < 0x2000) ||
!chunk_is_mmapped (p) || (p->size & PREV_INUSE) ||
((((unsigned long) p - p->prev_size) & page_mask) != 0) ||
((p->prev_size + sz) & page_mask) != 0)
!chunk_is_mmapped (p) || prev_inuse (p) ||
((((unsigned long) p - prev_size (p)) & page_mask) != 0) ||
((prev_size (p) + sz) & page_mask) != 0)
return NULL;
for (sz -= 1; (c = ((unsigned char *) p)[sz]) != magic; sz -= c)