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authorPrarit Bhargava <prarit@redhat.com>2013-11-12 15:08:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 12:09:11 +0900
commit3d035f580699feba352f8703cced127fc203f0dd (patch)
tree9469709ea2eda88e66531edb865ab41757615a0d /lib/Makefile
parent72403b4a0fbdf433c1fe0127e49864658f6f6468 (diff)
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>
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