linux-kernel - Re: ioremap_xxx() with EXEC enabled

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 for Android: free password hash cracker in your pocket

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

Date:	Wed, 30 Jan 2008 19:35:38 +0100
From:	Andi Kleen <ak@...e.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: ioremap_xxx() with EXEC enabled


> 1) 32 bit EFI is totally irrelevant.

Apparently not to the original poster. And some Apple x86 users might 
also disagree.

On x86-64 BTW while they could still rely on end_pfn_mapped and
it being direct mapped Venki's PAT patchkit removes that so ioremap
would be needed there too 

> 2) set_memory_ and set_pages_ API is not restricted to direct mapping.
> That's why they take a virtual address / struct page

If there is no direct mapping what page tables should they change?
Surely you're not suggesting they should walk all vmalloc areas and switch
them over. I don't think this is correct.

-Andi
--
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/