linux-toradex.git/arch/parisc/include/asm/uaccess.h, branch v4.2.7

parisc: macro whitespace fixes

2015-02-17T09:39:14+00:00

While working on arch/parisc/include/asm/uaccess.h, I noticed that some
macros within this header are made harder to read because they violate a
coding style rule: space is missing after comma.

Fix it up.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Helge Deller

parisc/uaccess: fix sparse errors

2015-02-16T21:41:27+00:00

virtio wants to read bitwise types from userspace using get_user.  At the
moment this triggers sparse errors, since the value is passed through an
integer.

Fix that up using __force.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Helge Deller 
Signed-off-by: Helge Deller

parisc: Use BUILD_BUG() instead of undefined functions

2014-11-10T21:22:42+00:00

Signed-off-by: Helge Deller

Revert "parisc: implement full version of access_ok()"

2013-11-19T22:31:35+00:00

This reverts commit 63379c135331c724d40a87b98eb62d2122981341.

It broke userspace and adding more checking is not needed.
Even checking if a syscall would access memory in page zero doesn't
makes sense since it may lead to some syscalls returning -EFAULT
where we would return other error codes on other platforms.
In summary, just drop this change and return to always return 1.

Signed-off-by: Helge Deller

parisc: implement full version of access_ok()

2013-11-07T21:29:14+00:00

Up to now PA-RISC could live with a trivial version of access_ok().
Our fault handlers can correctly handle fault cases.

But testcases showed that we need a better access check else we won't
always return correct errno failure codes to userspace.

Problem showed up during 32bit userspace tests in which writev() used a
32bit memory area and length which would then wrap around on 64bit
kernel.

Signed-off-by: Helge Deller

parisc: provide macro to create exception table entries

2013-11-07T21:25:33+00:00

Provide a macro ASM_EXCEPTIONTABLE_ENTRY() to create exception table
entries and convert all open-coded places to use that macro.

This patch is a first step toward creating a exception table which only
holds 32bit pointers even on a 64bit kernel. That way in my own kernel
I was able to reduce the in-kernel exception table from 44kB to 22kB.

Signed-off-by: Helge Deller

parisc: uaccess: fix compiler warnings caused by __put_user casting

2013-04-25T20:36:42+00:00

When targetting 32-bit processors, __put_user emits a pair of stw
instructions for the 8-byte case. If the type of __val is a pointer, the
marshalling code casts it to the wider integer type of u64, resulting
in the following compiler warnings:

  kernel/signal.c: In function 'copy_siginfo_to_user':
  kernel/signal.c:2752:11: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  kernel/signal.c:2752:11: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  [...]

This patch fixes the warnings by removing the marshalling code and using
the correct output modifiers in the __put_{user,kernel}_asm64 macros
so that GCC will allocate the right registers without the need to
extract the two words explicitly.

Cc: Helge Deller 
Signed-off-by: Will Deacon 
Signed-off-by: Helge Deller

[PARISC] update parisc to use generic strncpy_from_user()

2012-05-31T10:14:37+00:00

Signed-off-by: James Bottomley

Disintegrate asm/system.h for PA-RISC

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for PA-RISC.

Signed-off-by: David Howells 
cc: linux-parisc@vger.kernel.org

parisc: add strict copy size checks (v2)

2010-03-06T22:54:09+00:00

Add CONFIG_DEBUG_STRICT_USER_COPY_CHECKS, copied from the x86
implementation. Tested with 32 and 64bit kernel.

Signed-off-by: Helge Deller 
Signed-off-by: Kyle McMartin