linux-kernel - [PATCH 0/2] alpha/ptrace: Improved switch

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Message-ID: <87pmwlek8d.fsf_-_@disp2133>
Date:   Wed, 16 Jun 2021 13:29:38 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Michael Schmitz <schmitzmic@...il.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Oleg Nesterov <oleg@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        alpha <linux-alpha@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>
Subject: [PATCH 0/2] alpha/ptrace: Improved switch_stack handling


This pair of changes has not received anything beyond build and boot
testing.  I am posting these changes as they do a much better job of
warning of problems and shutting down the security hole.  Making them
a much better pattern than the my last patch.

I hope to get the test cases soon.

 arch/alpha/include/asm/thread_info.h   |  2 ++
 arch/alpha/kernel/entry.S              | 62 ++++++++++++++++++++++++++--------
 arch/alpha/kernel/process.c            |  3 ++
 arch/alpha/kernel/ptrace.c             | 13 +++++--
 arch/alpha/kernel/syscalls/syscall.tbl |  8 ++---
 5 files changed, 67 insertions(+), 21 deletions(-)

Eric W. Biederman (2):
      alpha/ptrace: Record and handle the absence of switch_stack
      alpha/ptrace: Add missing switch_stack frames