linux-kernel - Re: sg_set_page not usable for .bss?

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Date:	Tue, 2 Dec 2008 02:41:02 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	David Miller <davem@...emloft.net>
cc:	john.haxby@...cle.com, netfilter-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: sg_set_page not usable for .bss?


On Tuesday 2008-12-02 01:14, David Miller wrote:
>> >> 
>> >> Well, sysrq_password is in the .bss section, where as digest_password
>> >> is on the heap due to being kmalloc'ed. Maybe that makes a difference?
>> >> Someone more versed with the virtual memory layer might know.
>> >
>> >You can't use these interfaces on kernel image addresses.
>> >
>> Great :-)  So what is the best way to use the SHA1 crypto algo
>> with in-kernel addresses?
>
>kmalloc and copy it there, or something like that, you just
>can't use in-kernel addresses, ever.
>
Yes, kmalloc is already used. But then, what sort of address
does kmalloc return, if not an address within kernelspace?
(usually >=0xc0000000 on standard i386)
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