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From: Greg KH <gregkh@linuxfoundation.org>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Laura Abbott <labbott@redhat.com>,
	Alexander Popov <alex.popov@linux.com>,
	xen-devel@lists.xenproject.org, dri-devel@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, dev@openvswitch.org,
	linux-kbuild@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	kernel-hardening@lists.openwall.com
Subject: Re: [PATCH 1/3] treewide: Lift switch variables out of switches
Date: Wed, 23 Jan 2019 12:58:29 +0100	[thread overview]
Message-ID: <20190123115829.GA31385@kroah.com> (raw)
In-Reply-To: <20190123110349.35882-2-keescook@chromium.org>

On Wed, Jan 23, 2019 at 03:03:47AM -0800, Kees Cook wrote:
> Variables declared in a switch statement before any case statements
> cannot be initialized, so move all instances out of the switches.
> After this, future always-initialized stack variables will work
> and not throw warnings like this:
> 
> fs/fcntl.c: In function ‘send_sigio_to_task’:
> fs/fcntl.c:738:13: warning: statement will never be executed [-Wswitch-unreachable]
>    siginfo_t si;
>              ^~

That's a pain, so this means we can't have any new variables in { }
scope except for at the top of a function?

That's going to be a hard thing to keep from happening over time, as
this is valid C :(

greg k-h

  reply	other threads:[~2019-01-23 11:58 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-23 11:03 [PATCH 0/3] gcc-plugins: Introduce stackinit plugin Kees Cook
2019-01-23 11:03 ` [PATCH 1/3] treewide: Lift switch variables out of switches Kees Cook
2019-01-23 11:58   ` Greg KH [this message]
2019-01-23 12:09     ` Jann Horn
2019-01-23 12:12       ` Ard Biesheuvel
2019-01-23 13:21       ` William Kucharski
2019-01-23 14:17     ` [Intel-gfx] " Jani Nikula
2019-01-23 14:23       ` Jani Nikula
2019-01-23 14:47       ` Edwin Zimmerman
2019-01-23 15:46         ` Jani Nikula
2019-01-23 18:55           ` Kees Cook
2019-01-24  8:10             ` Greg KH
2019-01-23 19:18       ` Matthew Wilcox
2019-01-23 20:36         ` Kees Cook
2019-01-23 16:51   ` [Intel-wired-lan] " Jeff Kirsher
2019-01-24 12:58   ` Edwin Zimmerman
2019-01-23 11:03 ` [PATCH 2/3] gcc-plugins: Introduce stackinit plugin Kees Cook
2019-01-23 11:03 ` [PATCH 3/3] lib: Introduce test_stackinit module Kees Cook
2019-01-29  0:12 ` [PATCH 0/3] gcc-plugins: Introduce stackinit plugin Alexander Popov
2019-02-12 17:54   ` Kees Cook

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