From: Kees Cook <keescook@chromium.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>
Subject: Re: [RFC PATCH 5/5] selftest/x86: Add CET quick test
Date: Fri, 22 May 2020 10:36:00 -0700 [thread overview]
Message-ID: <202005221034.59F5DF75@keescook> (raw)
In-Reply-To: <20200522172711.GA317569@hirez.programming.kicks-ass.net>
On Fri, May 22, 2020 at 07:27:11PM +0200, Peter Zijlstra wrote:
> On Fri, May 22, 2020 at 10:22:51AM -0700, Kees Cook wrote:
>
> > But yes, I think getting a copy of asm.h would be nice here. I don't
> > think the WRITE_ONCE() is needed in this particular case. Hmm.
>
> Paranoia on my end because I had no clue wth he wanted with his -O0
> magic gunk.
Heh, yes, which is why I asked for many more comments. ;) I *think* it
was entirely to control the stack (and ssp) behavior (i.e. don't inline,
don't elide unused stack variables, etc).
--
Kees Cook
WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>
Subject: Re: [RFC PATCH 5/5] selftest/x86: Add CET quick test
Date: Fri, 22 May 2020 10:36:00 -0700 [thread overview]
Message-ID: <202005221034.59F5DF75@keescook> (raw)
In-Reply-To: <20200522172711.GA317569@hirez.programming.kicks-ass.net>
On Fri, May 22, 2020 at 07:27:11PM +0200, Peter Zijlstra wrote:
> On Fri, May 22, 2020 at 10:22:51AM -0700, Kees Cook wrote:
>
> > But yes, I think getting a copy of asm.h would be nice here. I don't
> > think the WRITE_ONCE() is needed in this particular case. Hmm.
>
> Paranoia on my end because I had no clue wth he wanted with his -O0
> magic gunk.
Heh, yes, which is why I asked for many more comments. ;) I *think* it
was entirely to control the stack (and ssp) behavior (i.e. don't inline,
don't elide unused stack variables, etc).
--
Kees Cook
next prev parent reply other threads:[~2020-05-22 17:36 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 21:17 [RFC PATCH 0/5] Update selftests/x86 for CET Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 21:17 ` [RFC PATCH 1/5] x86/cet/shstk: Modify ARCH_X86_CET_ALLOC_SHSTK for 32-bit address range Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 22:43 ` Kees Cook
2020-05-21 22:43 ` Kees Cook
2020-05-21 21:17 ` [RFC PATCH 2/5] selftest/x86: Enable CET for selftests/x86 Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 22:44 ` Kees Cook
2020-05-21 22:44 ` Kees Cook
2020-05-21 22:58 ` Yu-cheng Yu
2020-05-21 22:58 ` Yu-cheng Yu
2020-05-21 21:17 ` [RFC PATCH 3/5] selftest/x86: Fix sigreturn_64 test Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 22:47 ` Kees Cook
2020-05-21 22:47 ` Kees Cook
2020-05-21 22:48 ` Kees Cook
2020-05-21 22:48 ` Kees Cook
2020-05-21 21:17 ` [RFC PATCH 4/5] selftest/x86: Fix sysret_rip with ENDBR Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 21:34 ` Thomas Gleixner
2020-05-21 21:34 ` Thomas Gleixner
2020-05-21 21:34 ` Thomas Gleixner
2020-05-21 22:59 ` Yu-cheng Yu
2020-05-21 22:59 ` Yu-cheng Yu
2020-05-21 21:17 ` [RFC PATCH 5/5] selftest/x86: Add CET quick test Yu-cheng Yu
2020-05-21 21:17 ` Yu-cheng Yu
2020-05-21 23:02 ` Kees Cook
2020-05-21 23:02 ` Kees Cook
2020-05-21 23:23 ` Yu-cheng Yu
2020-05-21 23:23 ` Yu-cheng Yu
2020-05-22 9:28 ` Peter Zijlstra
2020-05-22 9:28 ` Peter Zijlstra
2020-05-22 15:10 ` Yu-cheng Yu
2020-05-22 15:10 ` Yu-cheng Yu
2020-05-22 17:22 ` Kees Cook
2020-05-22 17:22 ` Kees Cook
2020-05-22 17:27 ` Peter Zijlstra
2020-05-22 17:27 ` Peter Zijlstra
2020-05-22 17:36 ` Kees Cook [this message]
2020-05-22 17:36 ` Kees Cook
2020-05-22 18:07 ` Yu-cheng Yu
2020-05-22 18:07 ` Yu-cheng Yu
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