android_kernel_xiaomi_sm8350/arch
Paul Mackerras 08ae6cc15d [POWERPC] Allow exec faults on readable areas on classic 32-bit PowerPC
Classic 32-bit PowerPC CPUs, and the early 64-bit PowerPC CPUs, don't
provide a way to prevent execution from readable pages, that is, the
MMU doesn't distinguish between data reads and instruction reads,
although a different exception is taken for faults in data accesses
and instruction accesses.

Commit 9ba4ace39f, in the course of
fixing another bug, added a check that meant that a page fault due
to an instruction access would fail if the vma did not have the
VM_EXEC flag set.  This gives an inconsistent enforcement on these
CPUs of the no-execute status of the vma (since reading from the page
is sufficient to allow subsequent execution from it), and causes old
versions of ppc32 glibc (2.2 and earlier) to fail, since they rely
on executing the word before the GOT but don't have it marked
executable.

This fixes the problem by allowing execution from readable (or writable)
areas on CPUs which do not provide separate control over data and
instruction reads.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Jon Loeliger <jdl@freescale.com>
2007-07-22 21:30:58 +10:00
..
alpha some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
arm arm: fix up handle_mm_fault changes 2007-07-20 08:50:20 -07:00
arm26 mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
avr32 mm: fault feedback #2 2007-07-19 10:04:41 -07:00
blackfin some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
cris Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-07-19 14:28:19 -07:00
frv FRV: work around a possible compiler bug 2007-07-19 10:04:50 -07:00
h8300 PTRACE_POKEDATA consolidation 2007-07-17 10:23:03 -07:00
i386 arch/i386/xen/events.c should #include <asm/xen/hypervisor.h> 2007-07-20 08:44:19 -07:00
ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2007-07-20 12:02:20 -07:00
m32r Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6 2007-07-19 14:24:57 -07:00
m68k m68k: exclude more unbuildable drivers 2007-07-20 08:24:49 -07:00
m68knommu m68knommu: reformat show_cpuinfo() 2007-07-20 08:44:20 -07:00
mips [MIPS] User stack pointer randomisation 2007-07-20 18:57:40 +01:00
parisc define new percpu interface for shared data 2007-07-19 10:04:44 -07:00
powerpc [POWERPC] Allow exec faults on readable areas on classic 32-bit PowerPC 2007-07-22 21:30:58 +10:00
ppc Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6 2007-07-19 14:24:57 -07:00
s390 s390: Put allocated ELF notes in read-only data segment 2007-07-19 10:04:47 -07:00
sh sh: intc - add support for SH7750 and its variants 2007-07-20 18:44:49 +09:00
sh64 sh64: Flag sh64_get_page() as __init_refok. 2007-07-20 17:46:42 +09:00
sparc [SPARC]: Make sure dev_archdata is filled in for all devices. 2007-07-20 17:13:42 -07:00
sparc64 [SPARC64]: fix section mismatch warning in mdesc.c 2007-07-20 17:20:56 -07:00
um fallout from kbuild changes 2007-07-19 18:37:54 -07:00
v850 PTRACE_POKEDATA consolidation 2007-07-17 10:23:03 -07:00
x86_64 Update .gitignore for arch/i386/boot 2007-07-19 14:32:38 -07:00
xtensa Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-07-19 14:28:19 -07:00