From: Julien Grall <julien@xen.org>
To: Jan Beulich <jbeulich@suse.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"George Dunlap" <george.dunlap@citrix.com>,
"Ian Jackson" <iwj@xenproject.org>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Wei Liu" <wl@xen.org>
Subject: Re: [PATCH v2 1/4] x86: verify function type (and maybe attribute) in switch_stack_and_jump()
Date: Mon, 21 Dec 2020 16:23:06 +0000 [thread overview]
Message-ID: <896456a9-16cb-2549-f3a1-e431d5e6479c@xen.org> (raw)
In-Reply-To: <792c442d-c05a-7a00-c807-b94a54bca94f@suse.com>
Hi Jan,
On 15/12/2020 16:11, Jan Beulich wrote:
> It is imperative that the functions passed here are taking no arguments,
> return no values, and don't return in the first place. While the type
> can be checked uniformly, the attribute check is limited to gcc 9 and
> newer (no clang support for this so far afaict).
>
> Note that I didn't want to have the "true" fallback "implementation" of
> __builtin_has_attribute(..., __noreturn__) generally available, as
> "true" may not be a suitable fallback in other cases.
>
> Note further that the noreturn addition to startup_cpu_idle_loop()'s
> declaration requires adding unreachable() to Arm's
> switch_stack_and_jump(), or else the build would break. I suppose this
> should have been there already.
>
> For vmx_asm_do_vmentry() along with adding the attribute, also restrict
> its scope.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> Reviewed-by: Juergen Gross <jgross@suse.com>
For the Arm bits:
Acked-by: Julien Grall <jgrall@amazon.com>
Cheers,
--
Julien Grall
next prev parent reply other threads:[~2020-12-21 16:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-15 16:09 [PATCH v2 0/4] x86: XSA-348 follow-up Jan Beulich
2020-12-15 16:11 ` [PATCH v2 1/4] x86: verify function type (and maybe attribute) in switch_stack_and_jump() Jan Beulich
2020-12-15 16:28 ` Wei Liu
2020-12-21 16:23 ` Julien Grall [this message]
2020-12-15 16:12 ` [PATCH v2 2/4] x86: clobber registers in switch_stack_and_jump() when !LIVEPATCH Jan Beulich
2020-12-15 16:28 ` Wei Liu
2020-12-15 16:12 ` [PATCH v2 3/4] x86/PV: avoid double stack reset during schedule tail handling Jan Beulich
2020-12-15 16:29 ` Wei Liu
2020-12-15 16:13 ` [PATCH v2 4/4] livepatch: adjust a stale comment Jan Beulich
2020-12-15 16:34 ` Konrad Rzeszutek Wilk
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