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Date: Mon, 23 May 2022 12:39:12 -0700 From: Kees Cook <keescook@...omium.org> To: Christoph Hellwig <hch@...radead.org> Cc: Maninder Singh <maninder1.s@...sung.com>, pmladek@...e.com, bcain@...cinc.com, mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org, hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com, svens@...ux.ibm.com, satishkh@...co.com, sebaddel@...co.com, kartilak@...co.com, jejb@...ux.ibm.com, martin.petersen@...cle.com, mcgrof@...nel.org, jason.wessel@...driver.com, daniel.thompson@...aro.org, dianders@...omium.org, naveen.n.rao@...ux.ibm.com, anil.s.keshavamurthy@...el.com, davem@...emloft.net, mhiramat@...nel.org, peterz@...radead.org, mingo@...hat.com, will@...nel.org, longman@...hat.com, boqun.feng@...il.com, rostedt@...dmis.org, senozhatsky@...omium.org, andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk, akpm@...ux-foundation.org, arnd@...db.de, linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, linux-scsi@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-modules@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net, v.narang@...sung.com, onkarnath.1@...sung.com Subject: Re: [PATCH 0/5] kallsyms: make kallsym APIs more safe with scnprintf On Sat, May 21, 2022 at 11:07:52PM -0700, Christoph Hellwig wrote: > On Fri, May 20, 2022 at 02:06:56PM +0530, Maninder Singh wrote: > > kallsyms functionality depends on KSYM_NAME_LEN directly. > > but if user passed array length lesser than it, sprintf > > can cause issues of buffer overflow attack. > > > > So changing *sprint* and *lookup* APIs in this patch set > > to have buffer size as an argument and replacing sprintf with > > scnprintf. > > This is still a pretty horrible API. Passing something like > a struct seq_buf seems like the much better API here. Also with > the amount of arguments and by reference passing it might be worth > to pass them as a structure while you're at it. Yeah, I agree. It really seems like seq_buf would be nicer. -- Kees Cook
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