Package: linux-2.6
Version: 2.6.18.dfsg.1-11
Severity: serious
Tags: security patch
User: debian-kernel@lists.debian.org
Usertags: dkt-waiting-etch-security-update
The included version of the vserver patch allows contexts to renice
processes in other contexts. See patch.
diff -NurpP linux-2.6.19.3-vs2.2.0-rc13.3/kernel/pid.c
linux-2.6.19.3-vs2.2.0-rc13.4/kernel/pid.c
--- linux-2.6.19.3-vs2.2.0-rc13.3/kernel/pid.c 2006-12-04 01:47:02 +0100
+++ linux-2.6.19.3-vs2.2.0-rc13.4/kernel/pid.c 2007-02-23 00:30:28 +0100
@@ -286,6 +286,9 @@ void fastcall transfer_pid(struct task_s
struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type)
{
struct task_struct *result = NULL;
+
+ if (type == PIDTYPE_REALPID)
+ type = PIDTYPE_PID;
if (pid) {
struct hlist_node *first;
first = rcu_dereference(pid->tasks[type].first);
@@ -300,11 +303,17 @@ struct task_struct * fastcall pid_task(s
*/
struct task_struct *find_task_by_pid_type(int type, int nr)
{
+ struct task_struct *task;
+
if (type == PIDTYPE_PID)
nr = vx_rmap_pid(nr);
- else if (type == PIDTYPE_REALPID)
- type = PIDTYPE_PID;
- return pid_task(find_pid(nr), type);
+
+ task = pid_task(find_pid(nr), type);
+ if (task && (type != PIDTYPE_REALPID) &&
+ /* maybe VS_WATCH_P in the future? */
+ !vx_check(task->xid, VS_WATCH|VS_IDENT))
+ return NULL;
+ return task;
}
EXPORT_SYMBOL(find_task_by_pid_type);
diff -NurpP linux-2.6.19.3-vs2.2.0-rc13.3.1/include/linux/pid.h
linux-2.6.19.3-vs2.2.0-rc13.4/include/linux/pid.h
--- linux-2.6.19.3-vs2.2.0-rc13.3.1/include/linux/pid.h 2006-11-08 04:57:52
+0100
+++ linux-2.6.19.3-vs2.2.0-rc13.4/include/linux/pid.h 2007-02-22 18:09:39
+0100
@@ -105,7 +105,8 @@ static inline pid_t pid_nr(struct pid *p
struct pid *pid___ = find_pid(who); \
if (pid___ != NULL) \
hlist_for_each_entry_rcu((task), pos___, \
- &pid___->tasks[type], pids[type].node) {
+ &pid___->tasks[type], pids[type].node) \
+ if (vx_check((task)->xid, VS_WATCH_P|VS_IDENT)) {
#define while_each_task_pid(who, type, task) \
} \
@@ -124,7 +124,8 @@ static inline pid_t pid_nr(struct pid *p
struct hlist_node *pos___; \
if (pid != NULL) \
hlist_for_each_entry_rcu((task), pos___, \
- &pid->tasks[type], pids[type].node) {
+ &pid->tasks[type], pids[type].node) \
+ if (vx_check((task)->xid, VS_WATCH_P|VS_IDENT)) {
#define while_each_pid_task(pid, type, task) \
} \
Bastian
--
Power is danger.
-- The Centurion, "Balance of Terror", stardate 1709.2
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