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device_cgroup: fix RCU usage 

dev_cgroup->exceptions is protected with devcgroup_mutex for writes
and RCU for reads; however, RCU usage isn't correct.

* dev_exception_clean() doesn't use RCU variant of list_del() and
  kfree().  The function can race with may_access() and may_access()
  may end up dereferencing already freed memory.  Use list_del_rcu()
  and kfree_rcu() instead.

* may_access() may be called only with RCU read locked but doesn't use
  RCU safe traversal over ->exceptions.  Use list_for_each_entry_rcu().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Cc: stable@vger.kernel.org
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2012-11-06 09:17:37 -08:00
parent 64e1047713
commit 201e72acb2
1 changed files with 3 additions and 3 deletions
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6
security/device_cgroup.c
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@ -164,8 +164,8 @@ static void dev_exception_clean(struct dev_cgroup *dev_cgroup)
struct dev_exception_item *ex, *tmp; struct dev_exception_item *ex, *tmp;
list_for_each_entry_safe(ex, tmp, &dev_cgroup->exceptions, list) { list_for_each_entry_safe(ex, tmp, &dev_cgroup->exceptions, list) {
list_del(&ex->list); list_del_rcu(&ex->list);
kfree(ex); kfree_rcu(ex, rcu);
} }
} }
@ -298,7 +298,7 @@ static int may_access(struct dev_cgroup *dev_cgroup,
struct dev_exception_item *ex; struct dev_exception_item *ex;
bool match = false; bool match = false;
list_for_each_entry(ex, &dev_cgroup->exceptions, list) { list_for_each_entry_rcu(ex, &dev_cgroup->exceptions, list) {
if ((refex->type & DEV_BLOCK) && !(ex->type & DEV_BLOCK)) if ((refex->type & DEV_BLOCK) && !(ex->type & DEV_BLOCK))
continue; continue;
if ((refex->type & DEV_CHAR) && !(ex->type & DEV_CHAR)) if ((refex->type & DEV_CHAR) && !(ex->type & DEV_CHAR))