> -----Original Message----- > From: pet...@infradead.org <pet...@infradead.org> > Sent: Tuesday, August 25, 2020 8:09 PM > To: Masami Hiramatsu <mhira...@kernel.org> > Cc: Eddy Wu (RD-TW) <eddy...@trendmicro.com>; linux-kernel@vger.kernel.org; > x...@kernel.org; David S. Miller > <da...@davemloft.net> > Subject: Re: x86/kprobes: kretprobe fails to triggered if kprobe at function > entry is not optimized (trigger by int3 breakpoint) > > Surely we can do a lockless list for this. We have llist_add() and > llist_del_first() to make a lockless LIFO/stack. >
llist operations require atomic cmpxchg, for some arch doesn't have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, in_nmi() check might still needed. (HAVE_KRETPROBES && !CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG): arc, arm, csky, mips TREND MICRO EMAIL NOTICE The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system. For details about what personal information we collect and why, please see our Privacy Notice on our website at: Read privacy policy<http://www.trendmicro.com/privacy>
