X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fsys.c;h=a626116af5db96b58f47434eb47c6af23da6535e;hb=3925e6fc1f774048404fdd910b0345b06c699eb4;hp=d1fe71eb45469bc99f23cfe9aee83a8cbecc81b1;hpb=b22da92f2cf52b3c51dd9a45abb658b1414b0784;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/sys.c b/kernel/sys.c
index d1fe71eb454..a626116af5d 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -315,7 +315,7 @@ static void kernel_kexec(void)
 #endif
 }
 
-void kernel_shutdown_prepare(enum system_states state)
+static void kernel_shutdown_prepare(enum system_states state)
 {
 	blocking_notifier_call_chain(&reboot_notifier_list,
 		(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
@@ -916,8 +916,8 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 {
 	struct task_struct *p;
 	struct task_struct *group_leader = current->group_leader;
-	int err = -EINVAL;
-	struct pid_namespace *ns;
+	struct pid *pgrp;
+	int err;
 
 	if (!pid)
 		pid = task_pid_vnr(group_leader);
@@ -929,12 +929,10 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	/* From this point forward we keep holding onto the tasklist lock
 	 * so that our parent does not change from under us. -DaveM
 	 */
-	ns = current->nsproxy->pid_ns;
-
 	write_lock_irq(&tasklist_lock);
 
 	err = -ESRCH;
-	p = find_task_by_pid_ns(pid, ns);
+	p = find_task_by_vpid(pid);
 	if (!p)
 		goto out;
 
@@ -942,7 +940,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	if (!thread_group_leader(p))
 		goto out;
 
-	if (p->real_parent->tgid == group_leader->tgid) {
+	if (same_thread_group(p->real_parent, group_leader)) {
 		err = -EPERM;
 		if (task_session(p) != task_session(group_leader))
 			goto out;
@@ -959,10 +957,12 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	if (p->signal->leader)
 		goto out;
 
+	pgrp = task_pid(p);
 	if (pgid != pid) {
 		struct task_struct *g;
 
-		g = find_task_by_pid_type_ns(PIDTYPE_PGID, pgid, ns);
+		pgrp = find_vpid(pgid);
+		g = pid_task(pgrp, PIDTYPE_PGID);
 		if (!g || task_session(g) != task_session(group_leader))
 			goto out;
 	}
@@ -971,13 +971,10 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 	if (err)
 		goto out;
 
-	if (task_pgrp_nr_ns(p, ns) != pgid) {
-		struct pid *pid;
-
+	if (task_pgrp(p) != pgrp) {
 		detach_pid(p, PIDTYPE_PGID);
-		pid = find_vpid(pgid);
-		attach_pid(p, PIDTYPE_PGID, pid);
-		set_task_pgrp(p, pid_nr(pid));
+		attach_pid(p, PIDTYPE_PGID, pgrp);
+		set_task_pgrp(p, pid_nr(pgrp));
 	}
 
 	err = 0;
@@ -994,17 +991,14 @@ asmlinkage long sys_getpgid(pid_t pid)
 	else {
 		int retval;
 		struct task_struct *p;
-		struct pid_namespace *ns;
-
-		ns = current->nsproxy->pid_ns;
 
 		read_lock(&tasklist_lock);
-		p = find_task_by_pid_ns(pid, ns);
+		p = find_task_by_vpid(pid);
 		retval = -ESRCH;
 		if (p) {
 			retval = security_task_getpgid(p);
 			if (!retval)
-				retval = task_pgrp_nr_ns(p, ns);
+				retval = task_pgrp_vnr(p);
 		}
 		read_unlock(&tasklist_lock);
 		return retval;
@@ -1028,19 +1022,16 @@ asmlinkage long sys_getsid(pid_t pid)
 	else {
 		int retval;
 		struct task_struct *p;
-		struct pid_namespace *ns;
-
-		ns = current->nsproxy->pid_ns;
 
-		read_lock(&tasklist_lock);
-		p = find_task_by_pid_ns(pid, ns);
+		rcu_read_lock();
+		p = find_task_by_vpid(pid);
 		retval = -ESRCH;
 		if (p) {
 			retval = security_task_getsid(p);
 			if (!retval)
-				retval = task_session_nr_ns(p, ns);
+				retval = task_session_vnr(p);
 		}
-		read_unlock(&tasklist_lock);
+		rcu_read_unlock();
 		return retval;
 	}
 }
@@ -1048,35 +1039,29 @@ asmlinkage long sys_getsid(pid_t pid)
 asmlinkage long sys_setsid(void)
 {
 	struct task_struct *group_leader = current->group_leader;
-	pid_t session;
+	struct pid *sid = task_pid(group_leader);
+	pid_t session = pid_vnr(sid);
 	int err = -EPERM;
 
 	write_lock_irq(&tasklist_lock);
-
 	/* Fail if I am already a session leader */
 	if (group_leader->signal->leader)
 		goto out;
 
-	session = group_leader->pid;
 	/* Fail if a process group id already exists that equals the
 	 * proposed session id.
-	 *
-	 * Don't check if session id == 1 because kernel threads use this
-	 * session id and so the check will always fail and make it so
-	 * init cannot successfully call setsid.
 	 */
-	if (session > 1 && find_task_by_pid_type_ns(PIDTYPE_PGID,
-				session, &init_pid_ns))
+	if (pid_task(sid, PIDTYPE_PGID))
 		goto out;
 
 	group_leader->signal->leader = 1;
-	__set_special_pids(session, session);
+	__set_special_pids(sid);
 
 	spin_lock(&group_leader->sighand->siglock);
 	group_leader->signal->tty = NULL;
 	spin_unlock(&group_leader->sighand->siglock);
 
-	err = task_pgrp_vnr(group_leader);
+	err = session;
 out:
 	write_unlock_irq(&tasklist_lock);
 	return err;
@@ -1145,16 +1130,16 @@ static int groups_to_user(gid_t __user *grouplist,
     struct group_info *group_info)
 {
 	int i;
-	int count = group_info->ngroups;
+	unsigned int count = group_info->ngroups;
 
 	for (i = 0; i < group_info->nblocks; i++) {
-		int cp_count = min(NGROUPS_PER_BLOCK, count);
-		int off = i * NGROUPS_PER_BLOCK;
-		int len = cp_count * sizeof(*grouplist);
+		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+		unsigned int len = cp_count * sizeof(*grouplist);
 
-		if (copy_to_user(grouplist+off, group_info->blocks[i], len))
+		if (copy_to_user(grouplist, group_info->blocks[i], len))
 			return -EFAULT;
 
+		grouplist += NGROUPS_PER_BLOCK;
 		count -= cp_count;
 	}
 	return 0;
@@ -1165,16 +1150,16 @@ static int groups_from_user(struct group_info *group_info,
     gid_t __user *grouplist)
 {
 	int i;
-	int count = group_info->ngroups;
+	unsigned int count = group_info->ngroups;
 
 	for (i = 0; i < group_info->nblocks; i++) {
-		int cp_count = min(NGROUPS_PER_BLOCK, count);
-		int off = i * NGROUPS_PER_BLOCK;
-		int len = cp_count * sizeof(*grouplist);
+		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+		unsigned int len = cp_count * sizeof(*grouplist);
 
-		if (copy_from_user(group_info->blocks[i], grouplist+off, len))
+		if (copy_from_user(group_info->blocks[i], grouplist, len))
 			return -EFAULT;
 
+		grouplist += NGROUPS_PER_BLOCK;
 		count -= cp_count;
 	}
 	return 0;
@@ -1472,7 +1457,7 @@ asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
 	if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
 	    !capable(CAP_SYS_RESOURCE))
 		return -EPERM;
-	if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > NR_OPEN)
+	if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
 		return -EPERM;
 
 	retval = security_task_setrlimit(resource, &new_rlim);
@@ -1637,7 +1622,7 @@ asmlinkage long sys_umask(int mask)
 	mask = xchg(&current->fs->umask, mask & S_IRWXUGO);
 	return mask;
 }
-    
+
 asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			  unsigned long arg4, unsigned long arg5)
 {
@@ -1742,6 +1727,17 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			error = prctl_set_seccomp(arg2);
 			break;
 
+		case PR_CAPBSET_READ:
+			if (!cap_valid(arg2))
+				return -EINVAL;
+			return !!cap_raised(current->cap_bset, arg2);
+		case PR_CAPBSET_DROP:
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+			return cap_prctl_drop(arg2);
+#else
+			return -EINVAL;
+#endif
+
 		default:
 			error = -EINVAL;
 			break;