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Helge Deller 76343bfbca parisc: Fix access fault handling in pa_memcpy() 
commit 554bfeceb8 upstream.

pa_memcpy() is the major memcpy implementation in the parisc kernel which is
used to do any kind of userspace/kernel memory copies.

Al Viro noticed various bugs in the implementation of pa_mempcy(), most notably
that in case of faults it may report back to have copied more bytes than it
actually did.

Fixing those bugs is quite hard in the C-implementation, because the compiler
is messing around with the registers and we are not guaranteed that specific
variables are always in the same processor registers. This makes proper fault
handling complicated.

This patch implements pa_memcpy() in assembler. That way we have correct fault
handling and adding a 64-bit copy routine was quite easy.

Runtime tested with 32- and 64bit kernels.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-04-08 09:30:34 +02:00
..
configs mm/usercopy: get rid of CONFIG_DEBUG_STRICT_USER_COPY_CHECKS 2016-08-30 10:10:21 -07:00
include parisc: Clean up fixup routines for get_user()/put_user() 2017-04-08 09:30:34 +02:00
kernel parisc: Avoid stalled CPU warnings after system shutdown 2017-04-08 09:30:34 +02:00
lib parisc: Fix access fault handling in pa_memcpy() 2017-04-08 09:30:34 +02:00
math-emu parisc: Fix typo in fpudispatch.c 2016-05-22 22:29:07 +02:00
mm parisc: Clean up fixup routines for get_user()/put_user() 2017-04-08 09:30:34 +02:00
oprofile oprofile: more whitespace fixes 2008-10-15 20:55:51 +02:00
defpalo.conf parisc: switch to gzip-compressed vmlinuz kernel 2013-07-09 22:09:20 +02:00
install.sh parisc: make "make install" not depend on vmlinux 2013-11-07 22:28:06 +01:00
Kconfig parisc: Switch to generic sched_clock implementation 2016-11-25 12:31:58 +01:00
Kconfig.debug parisc: Fix ftrace function tracer 2016-04-14 17:47:19 +02:00
Makefile parisc: Fix ftrace function tracer 2016-04-14 17:47:19 +02:00
nm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00