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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y13sm6032193pgc.46.2021.10.21.10.09.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Oct 2021 10:09:34 -0700 (PDT) Date: Thu, 21 Oct 2021 10:09:33 -0700 From: Kees Cook To: Peter Zijlstra Cc: Mark Rutland , Shuah Khan , Alexey Dobriyan , linux-kselftest@vger.kernel.org, Josh Poimboeuf , Andrew Morton , Alexey Gladkov , jannh@google.com, vcaputo@pengaru.com, mingo@redhat.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, christian.brauner@ubuntu.com, amistry@google.com, Kenta.Tada@sony.com, legion@kernel.org, michael.weiss@aisec.fraunhofer.de, mhocko@suse.com, deller@gmx.de, zhengqi.arch@bytedance.com, me@tobin.cc, tycho@tycho.pizza, tglx@linutronix.de, bp@alien8.de, hpa@zytor.com, axboe@kernel.dk, metze@samba.org, laijs@linux.alibaba.com, luto@kernel.org, dave.hansen@linux.intel.com, ebiederm@xmission.com, ohoono.kwon@samsung.com, kaleshsingh@google.com, yifeifz2@illinois.edu, linux-arch@vger.kernel.org, vgupta@kernel.org, linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org, bcain@codeaurora.org, monstr@monstr.eu, tsbogend@alpha.franken.de, nickhu@andestech.com, jonas@southpole.se, mpe@ellerman.id.au, paul.walmsley@sifive.com, hca@linux.ibm.com, ysato@users.sourceforge.jp, davem@davemloft.net, chris@zankel.net, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: Re: [PATCH] selftests: proc: Make sure wchan works when it exists Message-ID: <202110211008.CC8B26A@keescook> References: <20211008235504.2957528-1-keescook@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211008235504.2957528-1-keescook@chromium.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 08, 2021 at 04:55:04PM -0700, Kees Cook wrote: > This makes sure that wchan contains a sensible symbol when a process is > blocked. Specifically this calls the sleep() syscall, and expects the > architecture to have called schedule() from a function that has "sleep" > somewhere in its name. For example, on the architectures I tested > (x86_64, arm64, arm, mips, and powerpc) this is "hrtimer_nanosleep": > > $ tools/testing/selftests/proc/proc-pid-wchan > ok: found 'sleep' in wchan 'hrtimer_nanosleep' > > Cc: Peter Zijlstra > Cc: Mark Rutland > Cc: Shuah Khan > Cc: Alexey Dobriyan > Cc: linux-kselftest@vger.kernel.org > Signed-off-by: Kees Cook Friendly ping. > --- > Hi Peter, > > Can you add this to the wchan series, please? This should help wchan from > regressing in the future, and allow us to notice if the depth accidentally > changes, like Mark saw. > --- I'd like to make sure we have a regression test for this. Will you add this to the wchan series please? -Kees -- Kees Cook