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Use max_align_t for memory sizeinfo alignment on OpenBSD

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On OpenBSD and more generally on platforms without either jemalloc or
malloc_(usable_)size, we need to increase the alignment for the memory
to sizeof(max_align_t) as with plain sizeof(void *), the compiled code
would be crashing when accessing the returned memory.
This commit is contained in:
Ondrej Sury 2021-07-13 12:35:52 +02:00 committed by Ondřej Surý
parent 97e1a1f929
commit 6eca4b402e
1 changed files with 29 additions and 10 deletions
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39
lib/isc/jemalloc_shim.h
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@ -13,6 +13,8 @@
#if !defined(HAVE_JEMALLOC)
#include <stddef.h>
#include <isc/util.h>
const char *malloc_conf = NULL;
@ -76,41 +78,58 @@ sallocx(void *ptr, int flags) {
#include <stdlib.h>
typedef union {
size_t size;
max_align_t __alignment;
} size_info;
static inline void *
mallocx(size_t size, int flags) {
void *ptr = NULL;
UNUSED(flags);
size_t *__ptr = malloc(size + sizeof(size_t));
REQUIRE(__ptr != NULL);
__ptr[0] = size;
size_info *si = malloc(size + sizeof(*si));
REQUIRE(si != NULL);
return (&__ptr[1]);
si->size = size;
ptr = &si[1];
return (ptr);
}
static inline void
sdallocx(void *ptr, size_t size, int flags) {
size_info *si = &(((size_info *)ptr)[-1]);
UNUSED(size);
UNUSED(flags);
free(&((size_t *)ptr)[-1]);
free(si);
}
static inline size_t
sallocx(void *ptr, int flags) {
size_info *si = &(((size_info *)ptr)[-1]);
UNUSED(flags);
return (((size_t *)ptr)[-1]);
return (si[0].size);
}
static inline void *
rallocx(void *ptr, size_t size, int flags) {
size_info *si = &(((size_info *)ptr)[-1]);
UNUSED(flags);
size_t *__ptr = realloc(&((size_t *)ptr)[-1], size + sizeof(size_t));
REQUIRE(__ptr != NULL);
__ptr[0] = size;
si = realloc(si, size + sizeof(*si));
REQUIRE(si != NULL);
return (&__ptr[1]);
si->size = size;
ptr = &si[1];
return (ptr);
}
#endif /* defined(HAVE_MALLOC_SIZE) || defined (HAVE_MALLOC_USABLE_SIZE) */