From 76aac0e9a17742e60d408be1a706e9aaad370891 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 14 Nov 2008 10:39:12 +1100 Subject: CRED: Wrap task credential accesses in the core kernel 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 Reviewed-by: James Morris Acked-by: Serge Hallyn Cc: Al Viro Cc: linux-audit@redhat.com Cc: containers@lists.linux-foundation.org Cc: linux-mm@kvack.org Signed-off-by: James Morris --- kernel/sys.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'kernel/sys.c') diff --git a/kernel/sys.c b/kernel/sys.c index 31deba8f7d16..ed5c29c748ac 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -114,10 +114,10 @@ void (*pm_power_off_prepare)(void); static int set_one_prio(struct task_struct *p, int niceval, int error) { + uid_t euid = current_euid(); int no_nice; - if (p->uid != current->euid && - p->euid != current->euid && !capable(CAP_SYS_NICE)) { + if (p->uid != euid && p->euid != euid && !capable(CAP_SYS_NICE)) { error = -EPERM; goto out; } @@ -176,16 +176,16 @@ asmlinkage long sys_setpriority(int which, int who, int niceval) case PRIO_USER: user = current->user; if (!who) - who = current->uid; + who = current_uid(); else - if ((who != current->uid) && !(user = find_user(who))) + if (who != current_uid() && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ do_each_thread(g, p) if (p->uid == who) error = set_one_prio(p, niceval, error); while_each_thread(g, p); - if (who != current->uid) + if (who != current_uid()) free_uid(user); /* For find_user() */ break; } @@ -238,9 +238,9 @@ asmlinkage long sys_getpriority(int which, int who) case PRIO_USER: user = current->user; if (!who) - who = current->uid; + who = current_uid(); else - if ((who != current->uid) && !(user = find_user(who))) + if (who != current_uid() && !(user = find_user(who))) goto out_unlock; /* No processes for this user */ do_each_thread(g, p) @@ -250,7 +250,7 @@ asmlinkage long sys_getpriority(int which, int who) retval = niceval; } while_each_thread(g, p); - if (who != current->uid) + if (who != current_uid()) free_uid(user); /* for find_user() */ break; } -- cgit v1.2.3