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ndr: short-circuit ace coda if no bytes left

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The overwhelmingly common case is that there are no bytes left, and
regardless of the ACE type we want to store an empty blob.

We know the blob will be empty if there are no bytes, so we don't need
to allocate a sub-ndr and tokens list and so forth.

This can save almost half the time of a security descriptor pull.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15574
(cherry picked from commit ac0c8ee01e)
This commit is contained in:
Douglas Bagnall 2023-12-31 13:06:40 +13:00 committed by Jule Anger
parent 8787185a6c
commit c9974e622b
1 changed files with 6 additions and 2 deletions
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8
librpc/ndr/ndr_sec_helper.c
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@ -79,6 +79,7 @@ _PUBLIC_ enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, ndr_flags
{
NDR_PULL_CHECK_FLAGS(ndr, ndr_flags);
if (ndr_flags & NDR_SCALARS) {
ssize_t sub_size;
NDR_CHECK(ndr_pull_align(ndr, 5));
NDR_CHECK(ndr_pull_security_ace_type(ndr, NDR_SCALARS, &r->type));
NDR_CHECK(ndr_pull_security_ace_flags(ndr, NDR_SCALARS, &r->flags));
@ -87,9 +88,12 @@ _PUBLIC_ enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, ndr_flags
NDR_CHECK(ndr_pull_set_switch_value(ndr, &r->object, sec_ace_object(r->type)));
NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, NDR_SCALARS, &r->object));
NDR_CHECK(ndr_pull_dom_sid(ndr, NDR_SCALARS, &r->trustee));
{
sub_size = ndr_subcontext_size_of_ace_coda(r, r->size, ndr->flags);
if (sub_size == 0) {
r->coda.ignored.data = NULL;
r->coda.ignored.length = 0;
} else {
struct ndr_pull *_ndr_coda;
ssize_t sub_size = ndr_subcontext_size_of_ace_coda(r, r->size, ndr->flags);
NDR_CHECK(ndr_pull_subcontext_start(ndr, &_ndr_coda, 0, sub_size));
NDR_CHECK(ndr_pull_set_switch_value(_ndr_coda, &r->coda, r->type));
NDR_CHECK(ndr_pull_security_ace_coda(_ndr_coda, NDR_SCALARS|NDR_BUFFERS, &r->coda));