linux-kernel - Re: [Patch] Elf loader crash while zero-filling .bss

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Message-ID: <Pine.LNX.4.64.0802112026470.30955@jikos.suse.cz>
Date:	Mon, 11 Feb 2008 20:28:42 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Abel Bernabeu <abelbg@...rp.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [Patch] Elf loader crash while zero-filling .bss

On Mon, 11 Feb 2008, Abel Bernabeu wrote:

> In such a way that set_brk(0x0, 0x100) does not alloc any space at all. 
> There are just more ways to get no memory allocation than 
> set_brk(elf_bss, elf_bss) (the equalness condition i've changed).
> Sorry, the correct description for the patch may be:
> set_brk(start, end) allocs just page aligned regions (by "colapsing"
> both extremes to the END of the page in which they lay)... That means
> than even if both pointers are not equal there are still some chances
> that set_brk has allocated no space at all because because
> ELF_PAGEALIGN(elf_bss) == ELF_PAGEALIGN(elf_brk)

Now, the question is whether it is valid for ELF binary to not have the 
end of .bss section (if present at all) not page-aligned.

-- 
Jiri Kosina
SUSE Labs
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