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Open Source and information security mailing list archives
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Date: Thu, 23 Sep 2021 10:08:28 +0200 From: David Hildenbrand <david@...hat.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: Peter Collingbourne <pcc@...gle.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org>, Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, Masahiro Yamada <masahiroy@...nel.org>, Sami Tolvanen <samitolvanen@...gle.com>, YiFei Zhu <yifeifz2@...inois.edu>, Colin Ian King <colin.king@...onical.com>, Mark Rutland <mark.rutland@....com>, Frederic Weisbecker <frederic@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>, Andrey Konovalov <andreyknvl@...il.com>, Gabriel Krisman Bertazi <krisman@...labora.com>, Balbir Singh <sblbir@...zon.com>, Chris Hyser <chris.hyser@...cle.com>, Daniel Vetter <daniel.vetter@...ll.ch>, Chris Wilson <chris@...is-wilson.co.uk>, Arnd Bergmann <arnd@...db.de>, Dmitry Vyukov <dvyukov@...gle.com>, Christian Brauner <christian.brauner@...ntu.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Alexey Gladkov <legion@...nel.org>, Ran Xiaokai <ran.xiaokai@....com.cn>, Xiaofeng Cao <caoxiaofeng@...ong.com>, Cyrill Gorcunov <gorcunov@...il.com>, Thomas Cedeno <thomascedeno@...gle.com>, Marco Elver <elver@...gle.com>, Alexander Potapenko <glider@...gle.com>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Evgenii Stepanov <eugenis@...gle.com> Subject: Re: [PATCH] kernel: introduce prctl(PR_LOG_UACCESS) On 22.09.21 21:22, Steven Rostedt wrote: > On Wed, 22 Sep 2021 19:46:47 +0200 > David Hildenbrand <david@...hat.com> wrote: > >>> All signals except SIGKILL and SIGSTOP are masked for the interval >>> between the prctl() and the next syscall in order to prevent handlers >>> for intervening asynchronous signals from issuing syscalls that may >>> cause uaccesses from the wrong syscall to be logged. >> >> Stupid question: can this be exploited from user space to effectively >> disable SIGKILL for a long time ... and do we care? > > I first misread it too, but then caught my mistake reading it a second > time. It says "except SIGKILL". So no, it does not disable SIGKILL. Thanks for pointing out the obvious Steve :) -- Thanks, David / dhildenb
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