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[109.81.1.107]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48066c37433sm182396725e9.10.2026.01.29.06.41.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jan 2026 06:41:45 -0800 (PST) Message-ID: Date: Thu, 29 Jan 2026 15:41:43 +0100 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 12/17] module: Move signature splitting up To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= Cc: Nathan Chancellor , Arnd Bergmann , Luis Chamberlain , Sami Tolvanen , Daniel Gomez , Paul Moore , James Morris , "Serge E. Hallyn" , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Naveen N Rao , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Nicolas Schier , Daniel Gomez , Aaron Tomlin , "Christophe Leroy (CS GROUP)" , Nicolas Schier , Nicolas Bouchinet , Xiu Jianfeng , =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= , Arnout Engelen , Mattia Rizzolo , kpcyrd , Christian Heusel , =?UTF-8?Q?C=C3=A2ju_Mihai-Drosi?= , Sebastian Andrzej Siewior , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, linux-security-module@vger.kernel.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-integrity@vger.kernel.org References: <20260113-module-hashes-v4-0-0b932db9b56b@weissschuh.net> <20260113-module-hashes-v4-12-0b932db9b56b@weissschuh.net> Content-Language: en-US From: Petr Pavlu In-Reply-To: <20260113-module-hashes-v4-12-0b932db9b56b@weissschuh.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 1/13/26 1:28 PM, Thomas Weißschuh wrote: > The signature splitting will also be used by CONFIG_MODULE_HASHES. > > Move it up the callchain, so the result can be reused. > > Signed-off-by: Thomas Weißschuh > --- > [...] > diff --git a/kernel/module/main.c b/kernel/module/main.c > index c09b25c0166a..d65bc300a78c 100644 > --- a/kernel/module/main.c > +++ b/kernel/module/main.c > @@ -3346,10 +3346,21 @@ static int early_mod_check(struct load_info *info, int flags) > > static int module_integrity_check(struct load_info *info, int flags) > { > + bool mangled_module = flags & (MODULE_INIT_IGNORE_MODVERSIONS | > + MODULE_INIT_IGNORE_VERMAGIC); > + size_t sig_len; > + const u8 *sig; > int err = 0; > > + if (IS_ENABLED(CONFIG_MODULE_SIG_POLICY)) { > + err = mod_split_sig(info->hdr, &info->len, mangled_module, > + &sig_len, &sig, "module"); > + if (err) > + return err; > + } > + > if (IS_ENABLED(CONFIG_MODULE_SIG)) > - err = module_sig_check(info, flags); > + err = module_sig_check(info, sig, sig_len); > > if (err) > return err; I suggest moving the IS_ENABLED(CONFIG_MODULE_SIG) block under the new IS_ENABLED(CONFIG_MODULE_SIG_POLICY) section. I realize that CONFIG_MODULE_SIG implies CONFIG_MODULE_SIG_POLICY, but I believe this change makes it more apparent that this it the case. Otherwise, one might for example wonder if sig_len in the module_sig_check() call can be undefined. if (IS_ENABLED(CONFIG_MODULE_SIG_POLICY)) { err = mod_split_sig(info->hdr, &info->len, mangled_module, &sig_len, &sig, "module"); if (err) return err; if (IS_ENABLED(CONFIG_MODULE_SIG)) err = module_sig_check(info, sig, sig_len); } -- Thanks, Petr