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Message-ID: <20231027045451.GA7838@lst.de> Date: Fri, 27 Oct 2023 06:54:51 +0200 From: Christoph Hellwig <hch@....de> To: Kees Cook <keescook@...omium.org> Cc: Steven Rostedt <rostedt@...dmis.org>, "Matthew Wilcox (Oracle)" <willy@...radead.org>, Christoph Hellwig <hch@....de>, Justin Stitt <justinstitt@...gle.com>, Kent Overstreet <kent.overstreet@...ux.dev>, Petr Mladek <pmladek@...e.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Sergey Senozhatsky <senozhatsky@...omium.org>, Masami Hiramatsu <mhiramat@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>, Jonathan Corbet <corbet@....net>, Yun Zhou <yun.zhou@...driver.com>, Jacob Keller <jacob.e.keller@...el.com>, Zhen Lei <thunder.leizhen@...wei.com>, linux-trace-kernel@...r.kernel.org, Yosry Ahmed <yosryahmed@...gle.com>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH v2] seq_buf: Introduce DECLARE_SEQ_BUF and seq_buf_str() On Thu, Oct 26, 2023 at 12:40:37PM -0700, Kees Cook wrote: > Solve two ergonomic issues with struct seq_buf; > > 1) Too much boilerplate is required to initialize: > > struct seq_buf s; > char buf[32]; > > seq_buf_init(s, buf, sizeof(buf)); > > Instead, we can build this directly on the stack. Provide > DECLARE_SEQ_BUF() macro to do this: > > DECLARE_SEQ_BUF(s, 32); DECLARE_SEQ_BUF_ONSTACK maybe? But otherwise this looks like a good concept. > Instead, we can just return s->buffer direction after terminating it > in refactored seq_buf_terminate(), now known as seq_buf_str(): > > do_soemthing(seq_buf_str(s)); Looks good. Btw, one typical do_something would be printing it, so adding a format specifier that's using this helper would also probably be very useful.
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