Commit 58ab9a08 authored by Dave Hansen's avatar Dave Hansen Committed by Thomas Gleixner

x86/pkeys: Check against max pkey to avoid overflows

Kirill reported a warning from UBSAN about undefined behavior when using
protection keys.  He is running on hardware that actually has support for
it, which is not widely available.

The warning triggers because of very large shifts of integers when doing a
pkey_free() of a large, invalid value. This happens because we never check
that the pkey "fits" into the mm_pkey_allocation_map().

I do not believe there is any danger here of anything bad happening
other than some aliasing issues where somebody could do:

	pkey_free(35);

and the kernel would effectively execute:

	pkey_free(8);

While this might be confusing to an app that was doing something stupid, it
has to do something stupid and the effects are limited to the app shooting
itself in the foot.
Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Cc: stable@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Cc: shuah@kernel.org
Cc: kirill.shutemov@linux.intel.com
Link: http://lkml.kernel.org/r/20170223222603.A022ED65@viggo.jf.intel.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent f2ae5da7
...@@ -46,6 +46,15 @@ extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey, ...@@ -46,6 +46,15 @@ extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline static inline
bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey) bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
{ {
/*
* "Allocated" pkeys are those that have been returned
* from pkey_alloc(). pkey 0 is special, and never
* returned from pkey_alloc().
*/
if (pkey <= 0)
return false;
if (pkey >= arch_max_pkey())
return false;
return mm_pkey_allocation_map(mm) & (1U << pkey); return mm_pkey_allocation_map(mm) & (1U << pkey);
} }
...@@ -82,12 +91,6 @@ int mm_pkey_alloc(struct mm_struct *mm) ...@@ -82,12 +91,6 @@ int mm_pkey_alloc(struct mm_struct *mm)
static inline static inline
int mm_pkey_free(struct mm_struct *mm, int pkey) int mm_pkey_free(struct mm_struct *mm, int pkey)
{ {
/*
* pkey 0 is special, always allocated and can never
* be freed.
*/
if (!pkey)
return -EINVAL;
if (!mm_pkey_is_allocated(mm, pkey)) if (!mm_pkey_is_allocated(mm, pkey))
return -EINVAL; return -EINVAL;
......
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