From: Roman Kiryanov <rkir@google.com>
To: Borislav Petkov <bp@alien8.de>
Cc: rjw@rjwysocki.net, pavel@ucw.cz,
Thomas Gleixner <tglx@linutronix.de>,
mingo@redhat.com, x86@kernel.org, linux-pm@vger.kernel.org,
Greg KH <gregkh@linuxfoundation.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Alistair Delva <adelva@google.com>,
Haitao Shan <hshan@google.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] arch: x86: power: cpu: init %gs before __restore_processor_state (clang)
Date: Tue, 15 Sep 2020 10:57:16 -0700 [thread overview]
Message-ID: <CAOGAQepp_1QXrNAAXbLpW8qrujfdszfU2rMoh804wKK-Ja66Yw@mail.gmail.com> (raw)
In-Reply-To: <20200915174643.GT14436@zn.tnic>
On Tue, Sep 15, 2020 at 10:46 AM Borislav Petkov <bp@alien8.de> wrote:
Hi Borislav, thank you for a quick response.
> Ok, google guys, pls make sure you Cc LKML too as this is where *all*
> patches and discussions are archived. Adding it now to Cc.
Thank you, I did not know this.
> Ok, so why is the kernel supposed to take yet another ugly workaround
> because there's a bug in the compiler?
I believe the kernel makes a questionable assumption on how clang
uses registers (gs will not be used if stack protection is disabled).
Both kernel and clang behaves unfortunate here.
> disable LTO
CFI depends on LTO.
next prev parent reply other threads:[~2020-09-15 17:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 17:26 [PATCH] arch: x86: power: cpu: init %gs before __restore_processor_state (clang) rkir
2020-09-15 17:46 ` Borislav Petkov
2020-09-15 17:57 ` Roman Kiryanov [this message]
2020-09-15 18:27 ` Borislav Petkov
2020-09-15 18:36 ` Roman Kiryanov
2020-09-15 18:52 ` Borislav Petkov
2020-09-15 18:55 ` Roman Kiryanov
2020-09-18 22:25 ` Pavel Machek
2020-09-21 23:28 ` Roman Kiryanov
2020-10-04 9:59 ` Pavel Machek
2020-09-15 18:00 ` Nick Desaulniers
2020-09-15 18:25 ` Borislav Petkov
2020-09-15 19:51 ` Nick Desaulniers
2020-09-15 20:20 ` Borislav Petkov
2020-09-15 21:49 ` Nick Desaulniers
2020-09-16 9:23 ` Borislav Petkov
2020-09-19 16:48 ` Pavel Machek
2020-09-16 8:17 ` peterz
2020-09-15 20:44 ` Arvind Sankar
2020-09-15 22:17 ` Pavel Machek
2020-09-15 22:21 ` Nick Desaulniers
2020-09-18 22:20 ` Pavel Machek
2020-09-15 23:13 ` Roman Kiryanov
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