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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id 11-20020a17090a004b00b00273fc850342sm2114438pjb.20.2023.09.29.14.54.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 14:54:07 -0700 (PDT) Date: Fri, 29 Sep 2023 14:54:06 -0700 From: Kees Cook To: Sami Tolvanen Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrew Morton , linux-mm@kvack.org, linux-riscv@lists.infradead.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] riscv: mm: Update mmap_rnd_bits_max Message-ID: <202309291452.66ED9B4D83@keescook> References: <20230929211155.3910949-4-samitolvanen@google.com> <20230929211155.3910949-6-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230929211155.3910949-6-samitolvanen@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230929_145411_056162_94E3F241 X-CRM114-Status: GOOD ( 10.68 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Fri, Sep 29, 2023 at 09:11:58PM +0000, Sami Tolvanen wrote: > ARCH_MMAP_RND_BITS_MAX is based on Sv39, which leaves a few > potential bits of mmap randomness on the table if we end up enabling > 4/5-level paging. Update mmap_rnd_bits_max to take the final address > space size into account. This increases mmap_rnd_bits_max from 24 to > 33 with Sv48/57. > > Signed-off-by: Sami Tolvanen I like this. Is RISCV the only arch where the paging level can be chosen at boot time? Reviewed-by: Kees Cook -- Kees Cook _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv