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[69.131.212.71]) by smtp.gmail.com with ESMTPSA id 00721157ae682-810ea25d0desm12295887b3.39.2026.06.30.08.54.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jun 2026 08:54:39 -0700 (PDT) Message-ID: <8c24ad17-8295-47be-a562-44c23538c4cb@gmail.com> Date: Tue, 30 Jun 2026 11:54:33 -0400 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: af_alg - Add af_alg_restrict sysctl, defaulting to 1 To: Simon Richter , Eric Biggers Cc: Andy Lutomirski , linux-crypto@vger.kernel.org, Herbert Xu , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-bluetooth@vger.kernel.org, iwd@lists.linux.dev, linux-hardening@vger.kernel.org, Milan Broz References: <20260622234803.6982-1-ebiggers@kernel.org> <20260623192715.GE1850517@google.com> <20260628185404.GA2292@quark> <641f0391-dd4b-4b25-88f5-5298fa6bf823@hogyros.de> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------e0YfzVnRT5G9tEtya22PXqUS" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------e0YfzVnRT5G9tEtya22PXqUS Content-Type: multipart/mixed; boundary="------------jvATffIEPDJVKRsY5dfwaRTl"; protected-headers="v1" Message-ID: <8c24ad17-8295-47be-a562-44c23538c4cb@gmail.com> Date: Tue, 30 Jun 2026 11:54:33 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: af_alg - Add af_alg_restrict sysctl, defaulting to 1 To: Simon Richter , Eric Biggers Cc: Andy Lutomirski , linux-crypto@vger.kernel.org, Herbert Xu , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-bluetooth@vger.kernel.org, iwd@lists.linux.dev, linux-hardening@vger.kernel.org, Milan Broz References: <20260622234803.6982-1-ebiggers@kernel.org> <20260623192715.GE1850517@google.com> <20260628185404.GA2292@quark> <641f0391-dd4b-4b25-88f5-5298fa6bf823@hogyros.de> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------D4emldI3KuGPJip1ur9mqAWG" --------------D4emldI3KuGPJip1ur9mqAWG Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 6/28/26 23:11, Simon Richter wrote: > Hi, >=20 > On 6/29/26 3:54 AM, Eric Biggers wrote: >=20 >> We could do that if it's what people want. Just keep in mind that it >> would be much more complex than the single tristate sysctl. And in >> practice the number of people who are knowledgeable enough to create >> these lists is quite small; we've seen similar things with other "Cryp= to >> API" configuration knobs that seem to never be touched in practice. >=20 > I don't think finer grained control is necessary. >=20 > The tristate is the best possible interface for the people running=20 > precompiled distribution kernels. Ideally, deactivating the restriction= =20 > should also be disallowed in lockdown mode -- and this becomes a lot=20 > easier to subvert if the list of algorithms is runtime configurable. >=20 > I think it is safe to assume that the people using AF_ALG with hardware= =20 > crypto engines are building embedded systems with a custom kernel=20 > configuration, so the .config is probably the best place for the=20 > selection of algorithms that should remain available in restricted mode= =2E >=20 > Simon I agree. That said, if the crypto_rng support is to remain, should it have a non-empty allowlist for privileged processes? Otherwise, it's dead code with the default sysctl value. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------D4emldI3KuGPJip1ur9mqAWG Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 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