linux-kernel - Re: [PATCH] video:uvesafb: Fix oops that uvesafb try to execute NX-protected page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 27 Mar 2012 14:32:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Wang YanQing <udknight@...il.com>
Cc:	FlorianSchandinat@....de, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, spock@...too.org
Subject: Re: [PATCH] video:uvesafb: Fix oops that uvesafb try to execute
 NX-protected page

On Tue, 27 Mar 2012 18:01:36 +0800
Wang YanQing <udknight@...il.com> wrote:

> 
> Ok! I try to check pcibios_enabled first, but get some opposition by Alan Cox,
> but I want to make thing work and fix the oops, so I choice the simple way to
> check the (__supported_pte_mask & _PAGE_NX) instead of to check this variable plus
> pci kernel boot parameter, pci mmconfig works or not, and more, and more. It is not
> the best method, but it works and maybe all will feel happy.

Okay let me ask the obvious question - why is it not the best method ?

Apart from adding a helper in the includes for the arch code of

	static inline is_nx_enabled(void)
	{
		return !!(__supported_pte_mask & _PAGE_NX);
	}

is there anything else it lacks ?

Yes ideally we'd set the relevant ROM areas executable, but for a simple
fix is there anything else that's a problem with it ?

Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/