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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

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Pull namespace fix from Eric Biederman:
 "This fixes a race between put_ucounts and get_ucounts that can cause a
  use after free. The fix works by simplifying the code and so there is
  not even a temptation to be clever and play spinlock vs atomic
  reference games"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  ucount: Remove the atomicity from ucount->count
This commit is contained in:
Linus Torvalds 2017-03-07 10:06:25 -08:00
commit 304362a8bc
2 changed files with 12 additions and 8 deletions
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include/linux/user_namespace.h
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@ -72,7 +72,7 @@ struct ucounts {
struct hlist_node node;
struct user_namespace *ns;
kuid_t uid;
atomic_t count;
int count;
atomic_t ucount[UCOUNT_COUNTS];
};