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Subject[GIT PULL] devmem fix for v4.11-rc7

Please pull this devmem change for v4.11-rc7. Tommi tested this successfully
and no one appears to have objected to the RFC patch, so here's the fix. :)



The following changes since commit b9b3322f13f350587f17f0a76f008830e3a420d3:

Merge branch 'stable-4.11' of git:// (2017-04-12 00:02:33 -0700)

are available in the git repository at:

git:// tags/devmem-v4.11-rc7

for you to fetch changes up to a4866aa812518ed1a37d8ea0c881dc946409de94:

mm: Tighten x86 /dev/mem with zeroing reads (2017-04-12 11:40:23 -0700)

Fixes /dev/mem to read back zeros for System RAM areas in the 1MB exception
area on x86 to avoid exposing RAM or tripping hardened usercopy.

Kees Cook (1):
mm: Tighten x86 /dev/mem with zeroing reads

arch/x86/mm/init.c | 41 +++++++++++++++++++--------
drivers/char/mem.c | 82 ++++++++++++++++++++++++++++++++++--------------------
2 files changed, 82 insertions(+), 41 deletions(-)

Kees Cook
Pixel Security

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