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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id l17sm548015otb.57.2021.03.09.06.03.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 Mar 2021 06:03:31 -0800 (PST) Subject: Re: [PATCH] util/osdep: Avoid mprotect() RWX->NONE on Big Sur 11.2 To: Roman Bolshakov , qemu-devel@nongnu.org References: <20210210105527.74943-1-r.bolshakov@yadro.com> From: Richard Henderson Message-ID: <4c5e6294-5354-e7e1-7ea4-96762721d094@linaro.org> Date: Tue, 9 Mar 2021 06:03:28 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210210105527.74943-1-r.bolshakov@yadro.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::332; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x332.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/10/21 2:55 AM, Roman Bolshakov wrote: > There's a change in mprotect() behaviour [1] in the latest macOS on M1 > and it's not yet clear if it's going to be fixed by Apple. For now we > can avoid unsupported mprotect() calls. QEMU and qtests work fine > without it. > > 1.https://gist.github.com/hikalium/75ae822466ee4da13cbbe486498a191f This is an unfortunate OS bug. But I can use this as an opportunity to tidy up some memory management, and in the process go from NONE -> {RX,RW} instead. r~