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Nest: Fix memory alignment in attribute cache

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In attribute cache, adata structures were stored densely in one memory
block, without regard to alignment. Let's force at least u32 alignment.
This commit is contained in:
Ondrej Zajicek 2023-12-13 17:46:16 +01:00
parent 2c7555cf2a
commit 7d2c7d59a3
2 changed files with 5 additions and 3 deletions
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1
nest/route.h
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@ -542,6 +542,7 @@ const char *ea_custom_name(uint ea);
#define EA_ALLOW_UNDEF 0x10000 /* ea_find: allow EAF_TYPE_UNDEF */
#define EA_BIT(n) ((n) << 24) /* Used in bitfield accessors */
#define EA_BIT_GET(ea) ((ea) >> 24)
#define EA_DATA_ALIGN 4 /* Alignment of adata in attribute cache */
#define EAF_TYPE_MASK 0x1f /* Mask with this to get type */
#define EAF_TYPE_INT 0x01 /* 32-bit unsigned integer number */

7
nest/rt-attr.c
View File

@ -766,7 +766,7 @@ ea_list_copy(ea_list *o)
{
eattr *a = &o->attrs[i];
if (!(a->type & EAF_EMBEDDED))
elen += sizeof(struct adata) + a->u.ptr->length;
elen += BIRD_ALIGN(sizeof(struct adata) + a->u.ptr->length, EA_DATA_ALIGN);
}
n = mb_alloc(rta_pool, elen);
@ -777,11 +777,12 @@ ea_list_copy(ea_list *o)
eattr *a = &n->attrs[i];
if (!(a->type & EAF_EMBEDDED))
{
unsigned size = sizeof(struct adata) + a->u.ptr->length;
uint size_u = sizeof(struct adata) + a->u.ptr->length;
uint size = BIRD_ALIGN(size_u, EA_DATA_ALIGN);
ASSERT_DIE(adpos + size <= elen);
struct adata *d = ((void *) n) + adpos;
memcpy(d, a->u.ptr, size);
memcpy(d, a->u.ptr, size_u);
a->u.ptr = d;
adpos += size;