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| author | Dave Hansen <dave.hansen@linux.intel.com> | 2016-07-29 09:30:10 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-09 13:02:26 +0200 |
| commit | e8c6226d483cb28f55cab718065ea1b7226d40e8 (patch) | |
| tree | 8928848c744638a077e5f4867ea426485c523b49 /arch/x86/mm | |
| parent | c6935931c1894ff857616ff8549b61236a19148f (diff) | |
| download | blackbird-op-linux-e8c6226d483cb28f55cab718065ea1b7226d40e8.tar.gz blackbird-op-linux-e8c6226d483cb28f55cab718065ea1b7226d40e8.zip | |
x86/pkeys: Add fault handling for PF_PK page fault bit
PF_PK means that a memory access violated the protection key
access restrictions. It is unconditionally an access_error()
because the permissions set on the VMA don't matter (the PKRU
value overrides it), and we never "resolve" PK faults (like
how a COW can "resolve write fault).
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: linux-arch@vger.kernel.org
Cc: Dave Hansen <dave@sr71.net>
Cc: arnd@arndb.de
Cc: linux-api@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: luto@kernel.org
Cc: akpm@linux-foundation.org
Cc: torvalds@linux-foundation.org
Link: http://lkml.kernel.org/r/20160729163010.DD1FE1ED@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/fault.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index dc8023060456..b88d8acb3ab5 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1112,6 +1112,15 @@ access_error(unsigned long error_code, struct vm_area_struct *vma) { /* This is only called for the current mm, so: */ bool foreign = false; + + /* + * Read or write was blocked by protection keys. This is + * always an unconditional error and can never result in + * a follow-up action to resolve the fault, like a COW. + */ + if (error_code & PF_PK) + return 1; + /* * Make sure to check the VMA so that we do not perform * faults just to hit a PF_PK as soon as we fill in a |
