linux/arch/s390
Martin Schwidefsky 043d07084b [S390] Remove data execution protection
The noexec support on s390 does not rely on a bit in the page table
entry but utilizes the secondary space mode to distinguish between
memory accesses for instructions vs. data. The noexec code relies
on the assumption that the cpu will always use the secondary space
page table for data accesses while it is running in the secondary
space mode. Up to the z9-109 class machines this has been the case.
Unfortunately this is not true anymore with z10 and later machines.
The load-relative-long instructions lrl, lgrl and lgfrl access the
memory operand using the same addressing-space mode that has been
used to fetch the instruction.
This breaks the noexec mode for all user space binaries compiled
with march=z10 or later. The only option is to remove the current
noexec support.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-05-23 10:24:28 +02:00
..
appldata [S390] appldata: fix dev_get_stats 64 bit conversion 2010-08-13 10:06:55 +02:00
boot Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2011-03-20 18:14:55 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2011-05-20 17:24:14 -07:00
hypfs [S390] hypfs: Move buffer allocation from open to read 2011-01-05 12:47:27 +01:00
include/asm [S390] Remove data execution protection 2011-05-23 10:24:28 +02:00
kernel [S390] Remove data execution protection 2011-05-23 10:24:28 +02:00
kvm [S390] kvm-390: Let kernel exit SIE instruction on work 2011-04-20 10:15:44 +02:00
lib futex: Sanitize futex ops argument types 2011-03-11 12:23:31 +01:00
math-emu s390: change to new flag variable 2011-03-17 14:02:57 +01:00
mm [S390] Remove data execution protection 2011-05-23 10:24:28 +02:00
oprofile [S390] oprofile: fix min/max interval query checks 2011-05-10 17:13:43 +02:00
defconfig [S390] Update default configuration 2011-01-12 09:55:24 +01:00
Kbuild [S390] standardize Kbuild rules 2010-10-25 16:10:14 +02:00
Kconfig [S390] Remove data execution protection 2011-05-23 10:24:28 +02:00
Kconfig.debug [S390] Write protect module text and RO data 2011-03-15 17:08:23 +01:00
Makefile [S390] remove redundant stack check option 2011-03-15 17:08:22 +01:00