linux-kernel - Re: [PATCH] x86: put initial_pg

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] [day] [month] [year] [list]

Date:	Tue, 10 Mar 2009 18:39:26 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: put initial_pg_tables into .bss -v4

H. Peter Anvin wrote:
> Yinghai Lu wrote:
>   
>> it just estimates initial_pg_tables size, and make _end a little bigger (1M), so boot loader could have idea of correct size of vmlinux aka the uncompressed size of in kernel.
>>
>> I assume brk patches could estimate the extra size that it needs too.
>>
>>     
>
> Yes, and I have made that point several times in this thread already.
>
> I really like the brk interface because it's a clean, general-purpose 
> allocator.
>
> We can create a brk segment in vmlinux (and even bound the brk to catch 
> overflows, instead of randomly failing) to advertise the presence of the 
> brk.
>   

I have a patchset to do exactly this in testing; I'll try to mail it out 
later this evening.  Its very similar (including reserving 1MB after the 
end of the bss variables, in the bss section).

    J
--
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/