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Date: Fri, 27 Oct 2017 13:15:27 +0200 From: Borislav Petkov <bp@...e.de> To: Zhou Chengming <zhouchengming1@...wei.com> Cc: mhiramat@...nel.org, ananth@...ux.vnet.ibm.com, anil.s.keshavamurthy@...el.com, davem@...emloft.net, hpa@...or.com, tglx@...utronix.de, peterz@...radead.org, jkosina@...e.cz, rostedt@...dmis.org, mjurczyk@...gle.com, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] kprobes, x86/alternatives: use text_mutex to protect smp_alt_modules On Fri, Oct 27, 2017 at 05:34:44PM +0800, Zhou Chengming wrote: > Fixes: 2cfa197 "ftrace/alternatives: Introducing *_text_reserved > functions" > > We use alternatives_text_reserved() to check if the address is in > the fixed pieces of alternative reserved, but the problem is that > we don't hold the smp_alt mutex when call this function. So the list > traversal may encounter a deleted list_head if another path is doing > alternatives_smp_module_del(). Is this something you've triggered on a real machine or is this just from code staring? -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
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