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CRED: Wrap task credential accesses in the SYSV IPC subsystem

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Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
David Howells 2008-11-14 10:39:06 +11:00 • committed by James Morris
commit 414c0708d0
3 changed files with 19 additions and 10 deletions
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5
ipc/shm.c
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@ -752,9 +752,10 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
goto out_unlock;
if (!capable(CAP_IPC_LOCK)) {
uid_t euid = current_euid();
err = -EPERM;
if (current->euid != shp->shm_perm.uid &&
current->euid != shp->shm_perm.cuid)
if (euid != shp->shm_perm.uid &&
euid != shp->shm_perm.cuid)
goto out_unlock;
if (cmd == SHM_LOCK &&
!current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)