linux-kernel - [PATCH 0/2] stackleak: allow to specify arch specific stackleak poison function

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Message-Id: <20230405130841.1350565-1-hca@linux.ibm.com>
Date:   Wed,  5 Apr 2023 15:08:39 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Popov <alex.popov@...ux.com>
Cc:     Vasily Gorbik <gor@...ux.ibm.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] stackleak: allow to specify arch specific stackleak poison function

Factor out the code that fills the stack with the stackleak poison value in
order to allow architectures to provide a faster implementation.

Use this to provide an s390 specific implementation which can fill the
stack with the poison value much faster (factor of ~10 compared to the
current version).

Note that the s390 stackleak support is currently only available via
linux-next (as of today), and the s390 kernel tree at kernel.org[1].
Therefore, if there are no objections, I'd like to add these two patches to
the s390 tree, so they can go upstream via the next merge window together
with the s390 support.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=b94c0ebb1ec752016a3e41bfb66bb51ea905e533

Thanks,
Heiko

Heiko Carstens (2):
  stackleak: allow to specify arch specific stackleak poison function
  s390/stackleak: provide fast __stackleak_poison() implementation

 arch/s390/include/asm/processor.h | 35 +++++++++++++++++++++++++++++++
 kernel/stackleak.c                | 17 +++++++++++----
 2 files changed, 48 insertions(+), 4 deletions(-)

-- 
2.37.2