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[85.187.217.62]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3821ae16113sm1664337f8f.71.2024.11.14.06.40.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Nov 2024 06:40:51 -0800 (PST) Message-ID: <3cc87528-e7a9-4dc0-800b-bb8f0cf279cd@suse.com> Date: Thu, 14 Nov 2024 16:40:50 +0200 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 2/3] x86/microcode/AMD: Make __verify_patch_size() return bool To: Borislav Petkov Cc: x86@kernel.org, linux-kernel@vger.kernel.org References: <20241018155151.702350-1-nik.borisov@suse.com> <20241018155151.702350-3-nik.borisov@suse.com> <20241114125818.GFZzXz6vdhwPdSa4dk@fat_crate.local> <20241114140154.GFZzYC0ifEztvQ49-P@fat_crate.local> <3fd8368f-fb21-452c-b9da-5382fcf4f657@suse.com> <20241114142652.GGZzYIrHJUVoE18vp4@fat_crate.local> Content-Language: en-US From: Nikolay Borisov In-Reply-To: <20241114142652.GGZzYIrHJUVoE18vp4@fat_crate.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 14.11.24 г. 16:26 ч., Borislav Petkov wrote: > On Thu, Nov 14, 2024 at 04:13:33PM +0200, Nikolay Borisov wrote: >>> if (sh_psize != max_size) >>> return false; >> >> Isn't sh_psize < max_size valid here? > > * sh_psize < min_t(u32, buf_size, max_size) == max_size -- ditto. > > This is still some sort of a mismatch which we'd rather fail. > > That max_size should probably be called patch_size or so. > > IOW, if the patch size in the header doesn't match the per-family patch size > => fail. Right, the important bit here is that max_size is not really max_size but, as you say, patch_size so for those families it's expected to have an exact size. With max_size I perceive it would imply that the current patch can be _at most_ max_size, but might as well be smaller. >