linux/arch/parisc/mm
James Bottomley d7dd2ff11b [PARISC] only make executable areas executable
Currently parisc has the whole kernel marked as RWX, meaning any
kernel page at all is eligible to be executed.  This can cause a
theoretical problem on systems with combined I/D TLB because the act
of referencing a page causes a TLB insertion with an executable bit.
This TLB entry may be used by the CPU as the basis for speculating the
page into the I-Cache.  If this speculated page is subsequently used
for a user process, there is the possibility we will get a stale
I-cache line picked up as the binary executes.

As a point of good practise, only mark actual kernel text pages as
executable.  The same has to be done for init_text pages, but they're
converted to data pages (and the I-Cache flushed) when the init memory
is released.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-04-15 12:55:18 -05:00
..
fault.c parisc: invoke oom-killer from page fault 2010-05-30 05:41:30 -04:00
init.c [PARISC] only make executable areas executable 2011-04-15 12:55:18 -05:00
ioremap.c parisc: fix wrong page aligned size calculation in ioremapping code 2010-08-12 08:43:29 -07:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00