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x86/mpx: Restrict the mmap() size check to bounds tables 

The comment and code here are confusing.  We do not currently
allocate the bounds directory in the kernel.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183702.222CEC2A@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2015-06-07 11:37:02 -07:00 committed by Ingo Molnar
parent 3c1d323009
commit eb099e5bc5
1 changed files with 2 additions and 2 deletions
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4
arch/x86/mm/mpx.c
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@ -46,8 +46,8 @@ static unsigned long mpx_mmap(unsigned long len)
vm_flags_t vm_flags;
struct vm_area_struct *vma;
/* Only bounds table and bounds directory can be allocated here */
if (len != MPX_BD_SIZE_BYTES && len != MPX_BT_SIZE_BYTES)
/* Only bounds table can be allocated here */
if (len != MPX_BT_SIZE_BYTES)
return -EINVAL;
down_write(&mm->mmap_sem);