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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id t12-20020a62ea0c000000b00643355ff6a6sm9215426pfh.99.2023.06.13.12.46.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jun 2023 12:46:29 -0700 (PDT) Date: Tue, 13 Jun 2023 12:46:29 -0700 From: Kees Cook To: Peter Zijlstra Cc: torvalds@linux-foundation.org, gregkh@linuxfoundation.org, pbonzini@redhat.com, masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: Re: [PATCH v3 03/57] locking: Introduce __cleanup() based infrastructure Message-ID: <202306131244.E8DF4CA166@keescook> References: <20230612090713.652690195@infradead.org> <20230612093537.614161713@infradead.org> <20230613105522.GU4253@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230613105522.GU4253@hirez.programming.kicks-ass.net> Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org On Tue, Jun 13, 2023 at 12:55:22PM +0200, Peter Zijlstra wrote: > On Mon, Jun 12, 2023 at 11:07:16AM +0200, Peter Zijlstra wrote: > > > --- /dev/null > > +++ b/include/linux/cleanup.h > > @@ -0,0 +1,167 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +#ifndef __LINUX_GUARDS_H > > +#define __LINUX_GUARDS_H > > + > > +#include > > + > > +/* > > + * DEFINE_FREE(name, type, free): > > + * simple helper macro that defines the required wrapper for a __free() > > + * based cleanup function. @free is an expression using '_T' to access > > + * the variable. > > + * > > + * __free(name): > > + * variable attribute to add a scoped based cleanup to the variable. > > + * > > no_free_ptr(var): > like a non-atomic xchg(var, NULL), such that the cleanup > function will be inhibited -- provided it sanely deals with a > NULL value. > > > + * return_ptr(p): > > + * returns p while inhibiting the __free(). > > + * > > + * Ex. > > + * > > + * DEFINE_FREE(kfree, void *, if (_T) kfree(_T)) > > + * > > + * struct obj *p = kmalloc(...); > > That should obviously have been: > > struct obj *p __free(kfree) = kmalloc(...); Okay, good. I noticed that too. :) I also didn't see any users of the kfree helpers (maybe I missed them?) Maybe add at least one conversion just to have an example conversion for it too? -Kees -- Kees Cook