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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BL6PEPF0001AB4A.mail.protection.outlook.com (10.167.242.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.181.6 via Frontend Transport; Thu, 2 Jul 2026 11:12:58 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Thu, 2 Jul 2026 06:12:58 -0500 Received: from [172.31.177.127] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Thu, 2 Jul 2026 06:12:53 -0500 Message-ID: <201f9da1-46dc-4366-915b-c956ac5994d3@amd.com> Date: Thu, 2 Jul 2026 16:42:52 +0530 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] perf test amd ibs: avoid using executable heap To: Ondrej Mosnacek , Peter Zijlstra , Ingo Molnar , "Arnaldo Carvalho de Melo" , Namhyung Kim CC: Mark Rutland , Alexander Shishkin , Jiri Olsa , "Ian Rogers" , Adrian Hunter , "James Clark" , , , , Ravi Bangoria References: <20260701062321.517351-1-omosnace@redhat.com> Content-Language: en-US From: Ravi Bangoria In-Reply-To: <20260701062321.517351-1-omosnace@redhat.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: wkj/sUwItU6x8OlEZrD7PxZ156ybC6wLmMo6JXJN4dAhhgOezfJIyrIeDkO4DNTHhjPnvRgQ0J7Bnjg+rtfSopXE/xd4mSAbgDqUyaE44+SyXgqHojPYkizw0SwRqFBza2tvmlnXEe32jDvQ3qjKuw8AcycUxtif3plnA1GqSgEZl7lQfwKjYMENm2HYkHBZTIzcTkUgIWNIRDAuMS+BKr42JQvMz6HwKJzHZfq0VB9ACGSg3PrVNPkEX8DzJT9R4scnDh/1OMKYDjczRImutt4pZ6tZMKIqVd9uNwxAKK7frm6zyfiisAB/kylQMhsRWQV4WiyIWgM50SLYaNDpknBYeXycl2m6RJ4FWxGqyS0/79OBJXMoW702EzR3EYQAdYhGDVI20i69mqC5kuRszLGdW4+uJwy/Pd2U9PQm9FnYAGGWXErquf2TsFDq4rNi X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2026 11:12:58.8675 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 323d6b1c-93ba-424e-1819-08ded82adfda X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB4A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9275 > Making [parts of] the heap executable is dangerous and is blocked by > SELinux on Fedora/RHEL even for an unconfined user. Replace the malloc() > + mprotect() combo with just mmap(), creating a private anonymous rwx > mapping, which only requires the more commonly allowed "execmem" > permission under SELinux (things like JIT or regex compilation need it > as well). mmap() with MAP_ANONYMOUS will give us a zeroed mapping that > begins on a page boundary, so the result is equivalent to the original > code even without a memset() or the page-alignment dance. > > Verified that the test still passes on a machine with an AMD CPU that > has the "ibs" CPU flag. > > Fixes: 35db59fa8ea2 ("perf test amd ibs: Add sample period unit test") > Signed-off-by: Ondrej Mosnacek Reviewed-by: Ravi Bangoria Thanks, Ravi