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s4-dsdb: use safe length limiting in string->integer conversion

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The ldap.py test suite could trigger a read past the end of the struct
ldb_val buffer
This commit is contained in:
Andrew Tridgell 2009-12-29 11:38:17 +11:00
parent c3061794ef
commit 708ad42b0b
1 changed files with 36 additions and 12 deletions
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46
source4/lib/ldb-samba/ldif_handlers.c
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@ -678,20 +678,43 @@ static int ldif_comparison_prefixMap(struct ldb_context *ldb, void *mem_ctx,
v1, v2);
}
/* length limited conversion of a ldb_val to a int32_t */
static int val_to_int32(const struct ldb_val *in, int32_t *v)
{
char *end;
char buf[64];
/* make sure we don't read past the end of the data */
if (in->length > sizeof(buf)-1) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
strncpy(buf, (char *)in->data, in->length);
buf[in->length] = 0;
/* We've to use "strtoll" here to have the intended overflows.
* Otherwise we may get "LONG_MAX" and the conversion is wrong. */
*v = (int32_t) strtoll(buf, &end, 0);
if (*end != 0) {
return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
}
return LDB_SUCCESS;
}
/* Canonicalisation of two 32-bit integers */
static int ldif_canonicalise_int32(struct ldb_context *ldb, void *mem_ctx,
const struct ldb_val *in, struct ldb_val *out)
{
char *end;
/* We've to use "strtoll" here to have the intended overflows.
* Otherwise we may get "LONG_MAX" and the conversion is wrong. */
int32_t i = (int32_t) strtoll((char *)in->data, &end, 0);
if (*end != 0) {
return -1;
int32_t i;
int ret;
ret = val_to_int32(in, &i);
if (ret != LDB_SUCCESS) {
return ret;
}
out->data = (uint8_t *) talloc_asprintf(mem_ctx, "%d", i);
if (out->data == NULL) {
return -1;
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
out->length = strlen((char *)out->data);
return 0;
@ -701,10 +724,11 @@ static int ldif_canonicalise_int32(struct ldb_context *ldb, void *mem_ctx,
static int ldif_comparison_int32(struct ldb_context *ldb, void *mem_ctx,
const struct ldb_val *v1, const struct ldb_val *v2)
{
/* We've to use "strtoll" here to have the intended overflows.
* Otherwise we may get "LONG_MAX" and the conversion is wrong. */
return (int32_t) strtoll((char *)v1->data, NULL, 0)
- (int32_t) strtoll((char *)v2->data, NULL, 0);
int32_t i1=0, i2=0;
val_to_int32(v1, &i1);
val_to_int32(v2, &i2);
if (i1 == i2) return 0;
return i1 > i2? 1 : -1;
}
/*