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author | Prarit Bhargava <prarit@redhat.com> | 2013-11-13 03:08:33 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 07:09:11 +0400 |
commit | 3d035f580699feba352f8703cced127fc203f0dd (patch) | |
tree | 9469709ea2eda88e66531edb865ab41757615a0d /lib/Makefile | |
parent | 72403b4a0fbdf433c1fe0127e49864658f6f6468 (diff) | |
download | linux-3d035f580699feba352f8703cced127fc203f0dd.tar.xz |
drivers/char/hpet.c: allow user controlled mmap for user processes
The CONFIG_HPET_MMAP Kconfig option exposes the memory map of the HPET
registers to userspace. The Kconfig help points out that in some cases
this can be a security risk as some systems may erroneously configure the
map such that additional data is exposed to userspace.
This is a problem for distributions -- some users want the MMAP
functionality but it comes with a significant security risk. In an effort
to mitigate this risk, and due to the low number of users of the MMAP
functionality, I've introduced a kernel parameter, hpet_mmap_enable, that
is required in order to actually have the HPET MMAP exposed.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Matt Wilson <msw@amazon.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/Makefile')
0 files changed, 0 insertions, 0 deletions