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Catch up to dynamically-sized cr_groups in FBSD80

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In FreeBSD 8.0 and later, (struct ucred)->cr_groups is a pointer
to a dynamically-allocated array, and NGROUPS is now 1024 by default
(tuneable at boot).
Don't put a gid_t[NGROUPS] on the stack for the FBSD80_ENV case.
Also avoid keeping a function-local ucred structure (in
afs_osi_proc2cred()), by bypassing that function entirely
(though this accesses the process credentials directly, which may
require locking; thread credentials accesses can be safely done
lock-free).  Add an osi_Panic() to ensure that it stays that way.
Don't pretend that we have a useful afs_osi_cred to export.
Don't blindly overwrite NGROUPS past cr_groups.

Change-Id: I76295164a24bddf2782ab2fa662acd0e1b4855d6
This commit is contained in:
Ben Kaduk 2010-03-22 22:35:51 -04:00
parent 1bb3522983
commit 2cf1f10a3a
5 changed files with 24 additions and 3 deletions
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2
src/afs/FBSD/osi_file.c
View File

@ -17,7 +17,9 @@
int afs_osicred_initialized = 0;
#ifndef AFS_FBSD80_ENV /* cr_groups is now malloc()'d */
afs_ucred_t afs_osi_cred;
#endif
afs_lock_t afs_xosi; /* lock is for tvattr */
extern struct osi_dev cacheDev;
extern struct mount *afs_cacheVfsp;

16
src/afs/FBSD/osi_groups.c
View File

@ -125,15 +125,24 @@ int
setpag(struct proc *proc, struct ucred **cred, afs_uint32 pagvalue,
afs_uint32 * newpag, int change_parent)
{
#ifdef AFS_FBSD80_ENV
gid_t *gidset;
int gidset_len = ngroups_max;
#else
gid_t gidset[NGROUPS];
int gidset_len = NGROUPS;
#endif
int ngroups, code;
int j;
AFS_STATCNT(setpag);
ngroups = afs_getgroups(*cred, NGROUPS, gidset);
#ifdef AFS_FBSD80_ENV
gidset = osi_Alloc(gidset_len * sizeof(gid_t));
#endif
ngroups = afs_getgroups(*cred, gidset_len, gidset);
if (afs_get_pag_from_groups(gidset[1], gidset[2]) == NOPAG) {
/* We will have to shift grouplist to make room for pag */
if (ngroups + 2 > NGROUPS) {
if (ngroups + 2 > gidset_len) {
return (E2BIG);
}
for (j = ngroups - 1; j >= 1; j--) {
@ -144,6 +153,9 @@ setpag(struct proc *proc, struct ucred **cred, afs_uint32 pagvalue,
*newpag = (pagvalue == -1 ? genpag() : pagvalue);
afs_get_groups_from_pag(*newpag, &gidset[1], &gidset[2]);
code = afs_setgroups(proc, cred, ngroups, gidset, change_parent);
#ifdef AFS_FBSD80_ENV
osi_Free(gidset, gidset_len * sizeof(gid_t));
#endif
return code;
}

3
src/afs/afs_osi_gcpags.c
View File

@ -436,6 +436,9 @@ afs_osi_proc2cred(afs_proc_t * pr)
{
afs_ucred_t *rv = NULL;
static afs_ucred_t cr;
#if defined(AFS_FBSD80_ENV)
osi_Panic("proc2cred broken for dynamic cr_groups");
#endif
if (pr == NULL) {
return NULL;

2
src/afs/afs_pioctl.c
View File

@ -4490,7 +4490,7 @@ HandleClientContext(struct afs_ioctl *ablob, int *com,
#ifdef AFS_AIX_ENV
newcred->cr_ngrps = 2;
#elif !defined(AFS_LINUX26_ENV) && !defined(AFS_SUN510_ENV)
# if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_LINUX22_ENV)
# if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_LINUX22_ENV) || defined(AFS_FBSD80_ENV)
newcred->cr_ngroups = 2;
# else
for (i = 2; i < NGROUPS; i++)

4
src/afs/afs_user.c
View File

@ -631,7 +631,11 @@ afs_GCPAGs_perproc_func(afs_proc_t * pproc)
afs_GCPAGs_perproc_count++;
#if defined(AFS_FBSD80_ENV)
pcred = pproc->p_ucred; /* XXX locking (or just use thread creds) */
#else
pcred = afs_osi_proc2cred(pproc);
#endif
if (!pcred)
return;