linux/arch
Mathieu Desnoyers 12b9d7ccb8 x86: Fix fixmap page order for FIX_TEXT_POKE0,1
Masami reported:

> Since the fixmap pages are assigned higher address to lower,
> text_poke() has to use it with inverted order (FIX_TEXT_POKE1
> to FIX_TEXT_POKE0).

I prefer to just invert the order of the fixmap declaration.
It's simpler and more straightforward.

Backward fixmaps seems to be used by both x86 32 and 64.

It's really rare but a nasty bug, because it only hurts when
instructions to patch are crossing a page boundary. If this
happens, the fixmap write accesses will spill on the following
fixmap, which may very well crash the system. And this does not
crash the system, it could leave illegal instructions in place.
Thanks Masami for finding this.

It seems to have crept into the 2.6.30-rc series, so this calls
for a -stable inclusion.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <20090701213722.GH19926@Krystal>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-03 14:34:09 +02:00
..
alpha
arm [ARM] 5562/2: at91: add gpio button support for at91sam9g20ek 2009-06-29 11:19:27 +01:00
avr32
blackfin Blackfin: fix dma-mapping build errors 2009-06-22 22:31:00 -04:00
cris Merge branch 'for-linus' of git://www.jni.nu/cris 2009-06-23 10:47:01 -07:00
frv
h8300 h8/300: fix incorrect "select" directives in arch/h8300/Kconfig.cpu. 2009-06-23 12:50:05 -07:00
ia64 KVM: ia64: fix ia64 build due to missing kallsyms_lookup() and double export 2009-06-28 14:10:30 +03:00
m32r
m68k
m68knommu
microblaze
mips MIPS: Cavium: Add CPU hotplugging code. 2009-06-24 18:34:40 +01:00
mn10300
parisc
powerpc Merge commit 'kumar/next' into merge 2009-06-26 16:58:01 +10:00
s390 KVM: s390: Allow stfle instruction in the guest 2009-06-28 14:10:30 +03:00
sh sh: Fix up HAVE_PERF_COUNTERS typo. 2009-06-24 01:41:05 +09:00
sparc sparc32: Fix makefile not generating required files 2009-06-25 19:56:02 -07:00
um UML: Fix some apparent bitrot 2009-06-25 11:22:13 -07:00
x86 x86: Fix fixmap page order for FIX_TEXT_POKE0,1 2009-07-03 14:34:09 +02:00
xtensa
.gitignore
Kconfig