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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id fy1sm147798pjb.14.2021.04.21.12.21.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Apr 2021 12:21:38 -0700 (PDT) Date: Wed, 21 Apr 2021 12:21:37 -0700 From: Kees Cook To: "Eric W. Biederman" Cc: David Hildenbrand , linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Alexander Viro , Peter Zijlstra , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Andrew Morton , Greg Ungerer , Mike Rapoport , Catalin Marinas , Kevin Brodsky , Michal Hocko , Feng Tang , Don Zickus , x86@kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v1 0/3] perf/binfmt/mm: remove in-tree usage of MAP_EXECUTABLE Message-ID: <202104211220.B7648776D@keescook> References: <20210421093453.6904-1-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 92F1EC0007D5 X-Stat-Signature: 3gqaef1h9fzucjhockaoyj318hqyqnb8 Received-SPF: none (chromium.org>: No applicable sender policy available) receiver=imf22; identity=mailfrom; envelope-from=""; helo=mail-pl1-f174.google.com; client-ip=209.85.214.174 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619032894-599453 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 21, 2021 at 02:03:49PM -0500, Eric W. Biederman wrote: > David Hildenbrand writes: > > > Stumbling over the history of MAP_EXECUTABLE, I noticed that we still > > have some in-tree users that we can get rid of. > > > > A good fit for the whole series could be Andrew's tree. > > In general this looks like a good cleanup. > > Acked-by: "Eric W. Biederman" Yeah, the PROT_EXEC parts are the only piece with meaning in the exec allocations. Reviewed-by: Kees Cook > As far as I can see we can go after MAP_DENYWRITE the same way. > Today deny_write_access in open_exec is what causes -ETXTBSY > when attempting to write to file that is current executing. Oh, interesting point. I didn't realize MAP_DENYWRITE was separate from deny_write_access(). -Kees -- Kees Cook