Date: Fri, 8 Dec 2017 12:09:50 +0300 From: Dan Carpenter <dan.carpenter@...cle.com> To: Greg KH <greg@...ah.com> Cc: at zhou <zhouat2017@...il.com>, security@...nel.org, secalert@...hat.com, security@...e.com, tglx@...utronix.de, oss-security@...ts.openwall.com, linux-distros@...openwall.org Subject: Re: signed integer overflow in common_timer_get on linux 4.15.0-rc1 On Thu, Dec 07, 2017 at 12:17:18PM +0100, Greg KH wrote: > On Thu, Dec 07, 2017 at 06:01:43PM +0800, at zhou wrote: > > Hi all, > > > > credit to L5@...vulcan team > > > > I fuzzed the linux kernel and find signed integer overflow on linux > > 4.15.0-rc1+. > > the crash log can see below, the .config and the poc file ,please see the > > attachments. > > Odd, doesn't seem to affect a 4.9 or 4.15-rc2 kernel here on my > machines, is there something specific in the .config that might be > triggering this? > Greg, you're running with UBSAN? I've always wondered how UBSAN was going to work because there are *so* many harmless integer overflows in the kernel. That's my main challenge with trying to use static analysis for integer overflows. regards, dan carpenter
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