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Thu, 22 Sep 2022 17:55:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gotplt.org; s=dreamhost; t=1663894506; bh=IYzaid1zIMxed8ACVzO1GtnRCaPzyovdpKRBURN9jFc=; h=Date:Subject:To:Cc:From:Content-Type:Content-Transfer-Encoding; b=xNqRleZDWPQKFRgPuc6+Hgec4akieUu/OuSNnZdagx6tMRHy6JuO8AS/XcGjQxPOd ky4axQwWzs4iyF92Yo0vXtQRyz0Rru11NDYsvBMUkqDwTkBZb4l/SdPbYFqgSwVWFi l2NBcRjF0eyWf4Pnz5k1nNsrqiUiGJUYvUQ4PXBl8JZXgs+5Xi47SUcv5RM8YiXfWZ M9A1s6YoYBieXfIillMv6bJjeWufVnGCsUtemzjfuw/0S6IXIHTUcYwwJfnMSAPPe5 oGE23ipAmunHfh6k0mDTPk2yxJWHjv1BBEVOHwZ4TdMOgycqLWITGrnJCbiHJ7mW2Y SLfxbBswGXQ9g== Message-ID: <760dbc4d-625b-ca31-ab89-a7d44a68483b@gotplt.org> Date: Thu, 22 Sep 2022 20:55:01 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 Subject: Re: [PATCH 0/4] fortify: Use __builtin_dynamic_object_size() when available Content-Language: en-US To: Kees Cook Cc: linux-hardening@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Arnd Bergmann , Juergen Gross , Boris Ostrovsky , Tom Rix , Miguel Ojeda , linux-kernel@vger.kernel.org, llvm@lists.linux.dev References: <20220920192202.190793-1-keescook@chromium.org> <202209221714.1D792FE6@keescook> From: Siddhesh Poyarekar In-Reply-To: <202209221714.1D792FE6@keescook> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org On 2022-09-22 20:20, Kees Cook wrote: > Yeah, this could be another interest set of additions. It seems like it > might be more "coder friendly" if, in the future that has the > __element_count__ attribute, it could be used in function parameters > too, like: > > If we had: > > int do_something(struct context *ctx, u32 *data, int count) > > this seems less easy to read to me: > > int __access(read_write, 2, 3) do_something(struct context *ctx, u32 *data, int count) > > as this seems more readable to me, though I guess the access-mode > information is lost: > > int do_something(struct context *ctx, u32 * __element_count(count) data, int count) It doesn't *have* to lose access mode info: int do_something(struct context *ctx, u32 * __element_count(count, __read_only__) data, int count) { ... } where omitting the access mode could imply __read_write__. Thanks, Sid