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Message-ID: <20180314170341.GA15364@kroah.com>
Date: Wed, 14 Mar 2018 18:03:41 +0100
From: Greg KH <greg@...ah.com>
To: Joao Moreira <jmoreira@...e.de>
Cc: kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
danielmicay@...il.com, keescook@...omium.org
Subject: Re: [PATCH] vgacon: fix function prototypes
On Sat, Mar 10, 2018 at 03:40:59AM -0300, Joao Moreira wrote:
> It is possible to indirectly invoke functions with prototypes that do not
> match those of the respectively used function pointers by using void types.
> Despite widely used as a feature for relaxing function invocation, this
> should be avoided when possible as it may prevent the use of heuristics
> such as prototype matching-based Control-Flow Integrity, which can be used
> to prevent ROP-based attacks.
>
> Given the above, the current efforts to improve the Linux security, and the
> upcoming kernel support to compilers with CFI features, fix prototypes in
> vgacon console driver.
>
> Another similar fix can be seen in [1].
>
> [1] https://android-review.googlesource.com/c/kernel/common/+/602010
>
> Signed-off-by: João Moreira <jmoreira@...e.de>
> Acked-by: Kees Cook <keescook@...omium.org>
> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
> drivers/video/console/vgacon.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
This fails the build :(
drivers/video/console/vgacon.c:1432:15: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
.con_putcs = vgacon_putcs,
^~~~~~~~~~~~
What tree should this go to? It doesn't apply at all to my tty tree,
which is where I thought it should go, so I tried a different one and
got this mess :(
confused,
greg k-h
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