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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-6.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,NICE_REPLY_A, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH 3/4] Revert "ARM: mmu: use client domain permissions to support ARMv7 eXecute Never" X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) On 2021-09-19 09:06, Rouven Czerwinski wrote: > Hi Peter, > > while this may break for your board, it fundamentally introduces the > possibility to speculate out of the RAM area on speculation happy I'm aware of that. For me, speculation is not an issue since *any* rogue code running on the embedded device in question is a major fail. Also, from the cover letter: "I'm going to follow up with patches. I very much realize that these patches are most likely not acceptable as-is, but I do include them since they are probably the best description of where the problems are." > processors. Are you calling into SAMA5D3 ROM code somewhere? If so an *I* am not calling anything. Maybe the board code for sama5d3xek is, but I have no idea as it's not "my" code. How can I figure out if it does? Cheers, Peter > exception can be added similar to the handling for the HAB code > (arch/arm/cpu/mmu_early.c): > > if (IS_ENABLED(CONFIG_HABV4) && IS_ENABLED(CONFIG_ARCH_IMX6)) > map_region(0x0, SZ_1M, PMD_SECT_DEF_CACHED); > > which allows calls into the NXP boot ROM to retrieve the HAB status. _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox