Author: brooks
Date: Fri Jan 15 07:18:46 2010
New Revision: 202342
URL: http://svn.freebsd.org/changeset/base/202342
Log:
Only allocate the space we need before calling kern_getgroups instead
of allocating what ever the user asks for up to "ngroups_max + 1". On
systems with large values of kern.ngroups this will be more efficient.
The now redundant check that the array is large enough in
kern_getgroups() is deliberate to allow this change to be merged to
stable/8 without breaking potential third party consumers of the API.
Reported by: bde
MFC after: 28 days
Modified:
head/sys/i386/ibcs2/ibcs2_misc.c
head/sys/kern/kern_prot.c
Modified: head/sys/i386/ibcs2/ibcs2_misc.c
==============================================================================
--- head/sys/i386/ibcs2/ibcs2_misc.c Fri Jan 15 07:05:00 2010
(r202341)
+++ head/sys/i386/ibcs2/ibcs2_misc.c Fri Jan 15 07:18:46 2010
(r202342)
@@ -663,9 +663,13 @@ ibcs2_getgroups(td, uap)
u_int i, ngrp;
int error;
- if (uap->gidsetsize < 0)
- return (EINVAL);
- ngrp = MIN(uap->gidsetsize, ngroups_max + 1);
+ if (uap->gidsetsize < td->td_ucred->cr_ngroups) {
+ if (uap->gidsetsize == 0)
+ ngrp = 0;
+ else
+ return (EINVAL);
+ } else
+ ngrp = td->td_ucred->cr_ngroups;
gp = malloc(ngrp * sizeof(*gp), M_TEMP, M_WAITOK);
error = kern_getgroups(td, &ngrp, gp);
if (error)
Modified: head/sys/kern/kern_prot.c
==============================================================================
--- head/sys/kern/kern_prot.c Fri Jan 15 07:05:00 2010 (r202341)
+++ head/sys/kern/kern_prot.c Fri Jan 15 07:18:46 2010 (r202342)
@@ -283,7 +283,13 @@ getgroups(struct thread *td, register st
u_int ngrp;
int error;
- ngrp = MIN(uap->gidsetsize, ngroups_max + 1);
+ if (uap->gidsetsize < td->td_ucred->cr_ngroups) {
+ if (uap->gidsetsize == 0)
+ ngrp = 0;
+ else
+ return (EINVAL);
+ } else
+ ngrp = td->td_ucred->cr_ngroups;
groups = malloc(ngrp * sizeof(*groups), M_TEMP, M_WAITOK);
error = kern_getgroups(td, &ngrp, groups);
if (error)
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