Messages in this thread |  | | | Date | Mon, 11 Feb 2008 12:35:55 -0800 | | From | "H. Peter Anvin" <> | | Subject | Re: [Patch] Elf loader crash while zero-filling .bss |
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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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