Date: Mon, 2 Mar 2020 11:08:02 -0800 From: Kees Cook <keescook@...omium.org> To: Kristen Carlson Accardi <kristen@...ux.intel.com> Cc: Jann Horn <jannh@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, Arjan van de Ven <arjan@...ux.intel.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, the arch/x86 maintainers <x86@...nel.org>, kernel list <linux-kernel@...r.kernel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com> Subject: Re: [RFC PATCH 09/11] kallsyms: hide layout and expose seed On Mon, Mar 02, 2020 at 11:01:56AM -0800, Kristen Carlson Accardi wrote: > On Thu, 2020-02-06 at 20:27 +0100, Jann Horn wrote: > > https://codesearch.debian.net/search?q=%2Fproc%2Fkallsyms&literal=1 > > I looked through some of these packages as Jann suggested, and it seems > like there are several that are using /proc/kallsyms to look for > specific symbol names to determine whether some feature has been > compiled into the kernel. This practice seems dubious to me, knowing > that many kernel symbol names can be changed at any time, but > regardless seems to be fairly common. Cool, so a sorted censored list is fine for non-root. Would root users break on a symbol-name-sorted view? (i.e. are two lists needed or can we stick to one?) -- Kees Cook
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