diff options
| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-07-17 01:59:51 +0300 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-07-21 10:05:18 +0200 |
| commit | 44b04912fa72489d403738f39e1c782614b7ae7c (patch) | |
| tree | 460fe18da21058de8080c90500fdc688d59902d8 /arch/x86/mm/hugetlbpage.c | |
| parent | x86/mm: Rename tasksize_32bit/64bit to task_size_32bit/64bit() (diff) | |
| download | linux-dev-44b04912fa72489d403738f39e1c782614b7ae7c.tar.xz linux-dev-44b04912fa72489d403738f39e1c782614b7ae7c.zip | |
x86/mpx: Do not allow MPX if we have mappings above 47-bit
MPX (without MAWA extension) cannot handle addresses above 47 bits, so we
need to make sure that MPX cannot be enabled if we already have a VMA above
the boundary and forbid creating such VMAs once MPX is enabled.
The patch implements mpx_unmapped_area_check() which is called from all
variants of get_unmapped_area() to check if the requested address fits
mpx.
On enabling MPX, we check if we already have any vma above 47-bit
boundary and forbit the enabling if we do.
As long as DEFAULT_MAP_WINDOW is equal to TASK_SIZE_MAX, the change is
nop. It will change when we allow userspace to have mappings above
47-bits.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170716225954.74185-6-kirill.shutemov@linux.intel.com
[ Readability edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/hugetlbpage.c')
| -rw-r--r-- | arch/x86/mm/hugetlbpage.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 868f02cf58ce..3cf89ad00f87 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -18,6 +18,7 @@ #include <asm/tlbflush.h> #include <asm/pgalloc.h> #include <asm/elf.h> +#include <asm/mpx.h> #if 0 /* This is just for testing */ struct page * @@ -135,6 +136,11 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, if (len & ~huge_page_mask(h)) return -EINVAL; + + addr = mpx_unmapped_area_check(addr, len, flags); + if (IS_ERR_VALUE(addr)) + return addr; + if (len > TASK_SIZE) return -ENOMEM; |