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rlimits: do security check under task_lock 

Do security_task_setrlimit under task_lock. Other tasks may change
limits under our hands while we are checking limits inside the
function. From now on, they can't.

Note that all the security work is done under a spinlock here now.
Security hooks count with that, they are called from interrupt context
(like security_task_kill) and with spinlocks already held (e.g.
capable->security_capable).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: James Morris <jmorris@namei.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Jiri Slaby 2009-11-14 17:37:04 +01:00 committed by Jiri Slaby
parent 1c1e618ddd
commit 86f162f4c7
1 changed files with 10 additions and 10 deletions
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20
kernel/sys.c
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@ -1277,7 +1277,7 @@ int do_setrlimit(struct task_struct *tsk, unsigned int resource,
struct rlimit *new_rlim)
{
struct rlimit *old_rlim;
int retval;
int retval = 0;
if (resource >= RLIM_NLIMITS)
return -EINVAL;
@ -1293,9 +1293,14 @@ int do_setrlimit(struct task_struct *tsk, unsigned int resource,
goto out;
}
retval = security_task_setrlimit(tsk->group_leader, resource, new_rlim);
if (retval)
goto out;
old_rlim = tsk->signal->rlim + resource;
task_lock(tsk->group_leader);
if (new_rlim->rlim_max > old_rlim->rlim_max &&
!capable(CAP_SYS_RESOURCE))
retval = -EPERM;
if (!retval)
retval = security_task_setrlimit(tsk->group_leader, resource,
new_rlim);
if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) {
/*
@ -1307,12 +1312,7 @@ int do_setrlimit(struct task_struct *tsk, unsigned int resource,
new_rlim->rlim_cur = 1;
}
old_rlim = tsk->signal->rlim + resource;
task_lock(tsk->group_leader);
if (new_rlim->rlim_max > old_rlim->rlim_max &&
!capable(CAP_SYS_RESOURCE))
retval = -EPERM;
else
if (!retval)
*old_rlim = *new_rlim;
task_unlock(tsk->group_leader);