X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fioprio.c;h=c7c0b28d7d2177c7c88d32f3f62856e97cfc7ff5;hb=1ab86aedbc7845a946b4ba4edf37762629970708;hp=5112554fd210a100a4a58ef1aa4e3aea61ed6629;hpb=86a264abe542cfececb4df129bc45a0338d8cdb9;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 5112554..c7c0b28 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -27,14 +27,20 @@
 #include <linux/security.h>
 #include <linux/pid_namespace.h>
 
-static int set_task_ioprio(struct task_struct *task, int ioprio)
+int set_task_ioprio(struct task_struct *task, int ioprio)
 {
 	int err;
 	struct io_context *ioc;
+	const struct cred *cred = current_cred(), *tcred;
 
-	if (task->cred->uid != current_euid() &&
-	    task->cred->uid != current_uid() && !capable(CAP_SYS_NICE))
+	rcu_read_lock();
+	tcred = __task_cred(task);
+	if (tcred->uid != cred->euid &&
+	    tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
+		rcu_read_unlock();
 		return -EPERM;
+	}
+	rcu_read_unlock();
 
 	err = security_task_setioprio(task, ioprio);
 	if (err)
@@ -64,8 +70,9 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
 	task_unlock(task);
 	return err;
 }
+EXPORT_SYMBOL_GPL(set_task_ioprio);
 
-asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
+SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
 {
 	int class = IOPRIO_PRIO_CLASS(ioprio);
 	int data = IOPRIO_PRIO_DATA(ioprio);
@@ -131,7 +138,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
 				break;
 
 			do_each_thread(g, p) {
-				if (p->cred->uid != who)
+				if (__task_cred(p)->uid != who)
 					continue;
 				ret = set_task_ioprio(p, ioprio);
 				if (ret)
@@ -181,7 +188,7 @@ int ioprio_best(unsigned short aprio, unsigned short bprio)
 		return aprio;
 }
 
-asmlinkage long sys_ioprio_get(int which, int who)
+SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
 {
 	struct task_struct *g, *p;
 	struct user_struct *user;
@@ -224,7 +231,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
 				break;
 
 			do_each_thread(g, p) {
-				if (p->cred->uid != user->uid)
+				if (__task_cred(p)->uid != user->uid)
 					continue;
 				tmpio = get_task_ioprio(p);
 				if (tmpio < 0)
@@ -245,4 +252,3 @@ asmlinkage long sys_ioprio_get(int which, int who)
 	read_unlock(&tasklist_lock);
 	return ret;
 }
-