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Date: Tue, 28 Aug 2007 15:17:11 +0200 From: Franck Bui-Huu <vagabon.xyz@...il.com> To: Arjan van de Ven <arjan@...radead.org> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: arch_align_stack() seems useless Hello Arjan, Arjan van de Ven wrote: > arch_align_stack aligns, on x86, within a 2 page range (this is for > cache coloring). OK, but for elf case this seems useless since the top of the stack is already randomized. It seems that the randomization stuff (top of the stack + stack pointer inside a page) belongs to the elf binary format whereas it could have been part of exec.c. Are there any reasons ? > The other thing you missed is that arch_align_stack() > is called in 2 locations, binfmt_elf.c is the primary location for > inside-the-page randomization. > Well not really because for mips case, we have: $ git grep ELF_PLATFORM include/asm-mips include/asm-mips/elf.h:#define ELF_PLATFORM (NULL) So on mips, the stack pointer won't get the inside the page randomization. Is that correct ? If so, I'm wondering why this randomization must depend on that string to be defined. I must admit that I'm not sure how it's used. I guess it's used by ld.so and it could be set to "mips" for now... thanks Franck - 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/
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