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

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Message-ID: <15577be70802111032l6ea6d2fagba2da4462c739d66@mail.gmail.com>
Date:	Mon, 11 Feb 2008 19:32:17 +0100
From:	"Abel Bernabeu" <abelbg@...rp.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [Patch] Elf loader crash while zero-filling .bss

2008/2/11, Abel Bernabeu <abelbg@...rp.com>:
> I've finally found a solution for the crash in load_binary_elf I
> reported last week:
>
> http://lkml.org/lkml/2008/1/30/171
>
> The attached patch solves my problem, but please test it yourself...
>
> set_brk(start, end) allocs just page aligned regions (by "colapsing"
> both extremes to the start 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
> ELF_PAGEALIGN(elf_bss) != ELF_PAGEALIGN(elf_brk).

Sorry this was an errata in my comment:  no space is allocated at all
because ELF_PAGEALIGN(elf_bss) == ELF_PAGEALIGN(elf_brk)
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