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AppArmor: Fix security_task_setrlimit logic for 2.6.36 changes

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2.6.36 introduced the abilitiy to specify the task that is having its
rlimits set.  Update mediation to ensure that confined tasks can only
set their own group_leader as expected by current policy.

Add TODO note about extending policy to support setting other tasks
rlimits.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
John Johansen 2010-09-06 10:10:20 -07:00 committed by James Morris
parent e819ff519b
commit 3a2dc8382a
3 changed files with 15 additions and 11 deletions
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4
security/apparmor/include/resource.h
View file

@ -33,8 +33,8 @@ struct aa_rlimit {
};
int aa_map_resource(int resource);
int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
struct rlimit *new_rlim);
int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *,
unsigned int resource, struct rlimit *new_rlim);
void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new);

2
security/apparmor/lsm.c
View file

@ -614,7 +614,7 @@ static int apparmor_task_setrlimit(struct task_struct *task,
int error = 0;
if (!unconfined(profile))
error = aa_task_setrlimit(profile, resource, new_rlim);
error = aa_task_setrlimit(profile, task, resource, new_rlim);
return error;
}

20
security/apparmor/resource.c
View file

@ -72,6 +72,7 @@ int aa_map_resource(int resource)
/**
* aa_task_setrlimit - test permission to set an rlimit
* @profile - profile confining the task (NOT NULL)
* @task - task the resource is being set on
* @resource - the resource being set
* @new_rlim - the new resource limit (NOT NULL)
*
@ -79,18 +80,21 @@ int aa_map_resource(int resource)
*
* Returns: 0 or error code if setting resource failed
*/
int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
struct rlimit *new_rlim)
int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *task,
unsigned int resource, struct rlimit *new_rlim)
{
int error = 0;
if (profile->rlimits.mask & (1 << resource) &&
new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max)
/* TODO: extend resource control to handle other (non current)
* processes. AppArmor rules currently have the implicit assumption
* that the task is setting the resource of the current process
*/
if ((task != current->group_leader) ||
(profile->rlimits.mask & (1 << resource) &&
new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max))
error = -EACCES;
error = audit_resource(profile, resource, new_rlim->rlim_max,
-EACCES);
return error;
return audit_resource(profile, resource, new_rlim->rlim_max, error);
}
/**