On Wed 24 Oct 2007 08:36, Robin Getz pondered: > Paul: > > I noticed that when passing a zero address to kallsyms_lookup(), the > kernel thought it was a valid kernel address, even if it was not for the > specific architecture it was running on. > > This was because is_kernel_extratext() was checking against labels that > don't exist on many archs. Since PPC is the only kernel which defines > _extra_text, (which doesn't seem to be used anymore?) there are three options: > - make the check dependant on PPC > - make the check dependant on extratext being populated > - remove _extra_text support from: > linux-2.6.x/arch/ppc/kernel/vmlinux.lds.S > linux-2.6.x/include/asm-generic/sections.h > linux-2.6.x/kernel/kallsyms.c > linux-2.6.x/scripts/kallsyms.c > > Since I don't know the history on that label I thought I would ask > (since PPC seem to be the only arch using it) before I sent a patch.
OK, it looks like: David Woodhouse added this functionality 5 May 2005: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=075d6eb16d273dab7b7b4b83fcee8bce4ee387ed and then Jon Loeliger removed everything in this section 17 Sep 2005 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6c45ab992e4299c869fb26427944a8f8ea177024 David/Jon: Is this section still used on PPC, or can the entire support for extratext be removed? Thanks - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
