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SubjectRe: [Patch] Elf loader crash while zero-filling .bss
Jiri Kosina wrote:
> 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.
>

Why wouldn't it be? It would, however, be valid to the kernel to round
it up to the next boundary.

-hpa


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