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Open Source and information security mailing list archives
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Date: Thu, 23 Sep 2021 18:16:16 -0700 From: Kees Cook <keescook@...omium.org> To: Vito Caputo <vcaputo@...garu.com> Cc: Jann Horn <jannh@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Josh Poimboeuf <jpoimboe@...hat.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, Jens Axboe <axboe@...nel.dk>, Mark Rutland <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>, Stefan Metzmacher <metze@...ba.org>, Andy Lutomirski <luto@...nel.org>, Lai Jiangshan <laijs@...ux.alibaba.com>, Christian Brauner <christian.brauner@...ntu.com>, Andrew Morton <akpm@...ux-foundation.org>, "Kenta.Tada@...y.com" <Kenta.Tada@...y.com>, Daniel Bristot de Oliveira <bristot@...hat.com>, Michael Weiß <michael.weiss@...ec.fraunhofer.de>, Anand K Mistry <amistry@...gle.com>, Alexey Gladkov <legion@...nel.org>, Michal Hocko <mhocko@...e.com>, Helge Deller <deller@....de>, Dave Hansen <dave.hansen@...ux.intel.com>, Andrea Righi <andrea.righi@...onical.com>, Ohhoon Kwon <ohoono.kwon@...sung.com>, Kalesh Singh <kaleshsingh@...gle.com>, YiFei Zhu <yifeifz2@...inois.edu>, "Eric W. Biederman" <ebiederm@...ssion.com>, linux-kernel@...r.kernel.org, x86@...nel.org, linux-fsdevel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] proc: Disable /proc/$pid/wchan On Thu, Sep 23, 2021 at 05:22:30PM -0700, Vito Caputo wrote: > Instead of unwinding stacks maybe the kernel should be sticking an > entrypoint address in the current task struct for get_wchan() to > access, whenever userspace enters the kernel? wchan is supposed to show where the kernel is at the instant the get_wchan() happens. (i.e. recording it at syscall entry would just always show syscall entry.) -- Kees Cook
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