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X-CSE-ConnectionGUID: +NyHpPk8SzGsMboPb58mRw== X-CSE-MsgGUID: zrzzKKAyT7iXXeGGzZTN/Q== X-IronPort-AV: E=McAfee;i="6700,10204,11355"; a="41077352" X-IronPort-AV: E=Sophos;i="6.13,312,1732608000"; d="scan'208";a="41077352" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2025 10:52:08 -0800 X-CSE-ConnectionGUID: XBIhuaevS5WPDtri+kYBvw== X-CSE-MsgGUID: fxayIjWdSveDXmRs3xcdYw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,312,1732608000"; d="scan'208";a="116644263" Received: from cmdeoliv-mobl4.amr.corp.intel.com (HELO [10.125.111.40]) ([10.125.111.40]) by fmviesa010-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2025 10:52:06 -0800 Message-ID: <385e1498-2444-4a7a-a1b0-0013b0b8fd68@intel.com> Date: Mon, 24 Feb 2025 10:52:13 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 1/7] mseal, system mappings: kernel config and header change To: Jeff Xu Cc: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de, adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com References: <20250224174513.3600914-1-jeffxu@google.com> <20250224174513.3600914-2-jeffxu@google.com> <443992d7-f694-4e46-b120-545350a5d598@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/24/25 10:44, Jeff Xu wrote: > For example: > Consider the case below in src/third_party/kernel/v6.6/fs/proc/task_mmu.c, > > #ifdef CONFIG_64BIT > [ilog2(VM_SEALED)] = "sl", > #endif > > Redefining VM_SEALED to VM_NONE for 32 bit won't detect the problem > in case that "#ifdef CONFIG_64BIT" line is missing. > > Please note, this has been like this since the first version of > mseal() RFC patch, and I prefer to keep it this way. That logic is reasonable. But it's different from the _vast_ majority of other flags. So what justifies VM_SEALED being so different? It's leading to pretty objectively ugly code in this series.