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Open Source and information security mailing list archives
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Date: Mon, 1 Jun 2015 10:06:49 -0700 From: Andy Lutomirski <luto@...capital.net> To: David Howells <dhowells@...hat.com> Cc: Andy Lutomirski <luto@...nel.org>, Luis Rodriguez <mcgrof@...e.com>, Matthew Garrett <mjg59@...f.ucam.org>, keyrings@...ux-nfs.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Kyle McMartin <kyle@...nel.org>, Linux Wireless List <linux-wireless@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Seth Forshee <seth.forshee@...onical.com>, LSM List <linux-security-module@...r.kernel.org>, Mimi Zohar <zohar@...ibm.com>, David Woodhouse <dwmw2@...radead.org> Subject: Re: [PATCH 16/20] PKCS#7: Add an optional authenticated attribute to hold firmware name [ver #5] On Mon, Jun 1, 2015 at 8:50 AM, David Howells <dhowells@...hat.com> wrote: > Andy Lutomirski <luto@...capital.net> wrote: > >> > You can also fudge the signature (or a hash) by adding extra data to or >> > modifying the data blob and by switching signature values between signature >> > blobs. >> >> So there's another design error in PKCS#7? Great! > > No. This applies to *all* signatures where you're signing a hash. What kind of fudging are you talking about here? I don't see what not-intentionally-signed message can be generically fudged to look like it's signed. --Andy -- 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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