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[34.125.46.171]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36f6bf827e6sm9411861a91.1.2026.06.05.11.30.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2026 11:30:06 -0700 (PDT) Date: Fri, 5 Jun 2026 18:30:02 +0000 From: Sami Tolvanen To: Michal Gorlas Cc: Jonathan Corbet , Shuah Khan , Luis Chamberlain , Petr Pavlu , Daniel Gomez , Aaron Tomlin , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org Subject: Re: [PATCH 2/2] module: restrict autoload to CAP_SYS_ADMIN if CONFIG_MODULE_RESTRICT_AUTOLOAD Message-ID: <20260605183002.GB2939956@google.com> References: <20260515-autoload_restrict-v1-0-40b7c03ddd04@9elements.com> <20260515-autoload_restrict-v1-2-40b7c03ddd04@9elements.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260515-autoload_restrict-v1-2-40b7c03ddd04@9elements.com> On Fri, May 15, 2026 at 07:20:20PM +0200, Michal Gorlas wrote: > Restrict module auto-loading to CAP_SYS_ADMIN if > CONFIG_MODULE_RESTRICT_AUTOLOAD is enabled, cmdline parameter > modrestrict=true, or kernel.modrestrict=1 is set with sysctl. > > Signed-off-by: Michal Gorlas > --- > kernel/module/internal.h | 1 + > kernel/module/kmod.c | 5 +++++ > kernel/module/main.c | 11 +++++++++++ > 3 files changed, 17 insertions(+) > > diff --git a/kernel/module/internal.h b/kernel/module/internal.h > index 061161cc79d9..496d8703f0c6 100644 > --- a/kernel/module/internal.h > +++ b/kernel/module/internal.h > @@ -46,6 +46,7 @@ struct kernel_symbol { > > extern struct mutex module_mutex; > extern struct list_head modules; > +extern bool module_autoload_restrict; > > extern const struct module_attribute *const modinfo_attrs[]; > extern const size_t modinfo_attrs_count; > diff --git a/kernel/module/kmod.c b/kernel/module/kmod.c > index a25dccdf7aa7..58b28c23f571 100644 > --- a/kernel/module/kmod.c > +++ b/kernel/module/kmod.c > @@ -156,6 +156,11 @@ int __request_module(bool wait, const char *fmt, ...) > if (ret) > return ret; > > + if (module_autoload_restrict && !capable(CAP_SYS_ADMIN)) { > + pr_alert("denied attempt to auto-load module %s\n", module_name); Is pr_alert appropriate here or can this be a warning? Also, use the _ratelimited variant like the pre-existing warning in this function. Sami