MIRRORS/linux-imx
1
0
Fork 0
mirror of https://github.com/nxp-imx/linux-imx.git synced 2025-07-13 20:59:37 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

s390: Mark psw in __load_psw_mask() as __unitialized

Browse Source 
[ Upstream commit 7278a8fb8d ]

Without __unitialized, the following code is generated when
INIT_STACK_ALL_ZERO is enabled:

86: d7 0f f0 a0 f0 a0     xc      160(16,%r15), 160(%r15)
8c: e3 40 f0 a0 00 24     stg     %r4, 160(%r15)
92: c0 10 00 00 00 08     larl    %r1, 0xa2
98: e3 10 f0 a8 00 24     stg     %r1, 168(%r15)
9e: b2 b2 f0 a0           lpswe   160(%r15)

The xc is not adding any security because psw is fully initialized
with the following instructions. Add __unitialized to the psw
definitiation to avoid the superfluous clearing of psw.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sven Schnelle 2024-04-30 16:30:01 +02:00 committed by Greg Kroah-Hartman
parent d6c686c01c
commit 21379c6fc8
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/processor.h
View File

@ -308,8 +308,8 @@ static inline void __load_psw(psw_t psw)
*/
static __always_inline void __load_psw_mask(unsigned long mask)
{
psw_t psw __uninitialized;
unsigned long addr;
psw_t psw;
psw.mask = mask;