linux-kernel - Re: [PATCH] IA32 move PG0 page table within kernel data segment

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]

Message-ID: <p73k630cq6u.fsf@verdi.suse.de>
Date:	16 Oct 2006 16:04:25 +0200
From:	Andi Kleen <ak@...e.de>
To:	"bibo,mao" <bibo.mao@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IA32 move PG0 page table within kernel data segment

"bibo,mao" <bibo.mao@...el.com> writes:

> Hi,
>   On i386 kernel image can compile and run at any physical address,kernel
> will dynamically establish initial page table at PG0. Currently PG0 address
> is adjacent to _end, that is to say PG0 page table is out of kernel data segment.
>  Some bootloader put initrd image next kernel data segment so that initial
> page table will overwrite initrd imagte. This patch modify this and put PG0
> table at BSS segment and free this space later.
>   This patch limited kernel image size within 64M, it is possible to modify
> ld script to remove this limit, but I am not familiar with ld script.
> 
>  Any comments is welcome.

Looks like a fragile hack. x86-64 has a imho cleaner generic solution
in e820_find_area(). I would suggest to port that over.

-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/