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Open Source and information security mailing list archives
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Date: Wed, 01 Aug 2007 08:41:38 -0400 From: "H. Peter Anvin" <hpa@...or.com> To: bbpetkov@...oo.de CC: Xudong Guan <xudong.guan@...il.com>, linux-kernel@...r.kernel.org, Chuck Ebbert <cebbert@...hat.com> Subject: Re: 2.6.23-rc1: no setup signature found... Borislav Petkov wrote: > > if i do delete here, it loads the second stage of grub and continues to load the > kernel. Is there another way to land at the jmp instruction instead of poking > blindly, maybe disassemble something parts of the initial code. \me reading > grub-docs... > Oh lovely. The purpose of this was to intercept the running of the kernel setup code. If grub doesn't load it at a 64K boundary, it is hard to guess what it would do. I'll do some experiments with qemu here and see if I can figure out a way to get it to trap at the right point. -hpa - 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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