Messages in this thread | | | Date | Wed, 25 Oct 2017 08:56:46 +0200 | From | Greg KH <> | Subject | Re: [PATCH RFC] random: fix syzkaller fuzzer test int overflow |
| |
On Wed, Oct 25, 2017 at 02:30:56PM +0800, Chen Feng wrote: > Hi Ted, > > On 2017/10/24 18:25, Theodore Ts'o wrote: > > On Tue, Oct 24, 2017 at 11:09:27AM +0200, Greg KH wrote: > >> On Tue, Oct 24, 2017 at 03:44:17PM +0800, Chen Feng wrote: > >>> [pid:11940,cpu6,syz-executor][flp_ioctl]cmd[0x1] > >>> Restart is not permit > >>> ================================================================= > >>> UBSAN: Undefined behaviour in > >>> kernel/linux-4.4/drivers/char/random.c:676:19 > >>> signed integer overflow: > >>> 2147483645 + 268435455 cannot be represented in type 'int' > >>> CPU: 4 PID: 11941 Comm: syz-executor Not tainted 4.4.76+ #2 > >> > >> Does this also happen on 4.14-rc6? > > > > No. It was fixed in 4.8, by commit 86a574de4590: "random: strengthen > > input validation for RNDADDTOENTCNT". > > > I see my kernel has already merged this patch. So I don't think this patch > can resolve the issue above.
Do you have a reproducer for this issue that we can use to test?
thanks,
greg k-h
| |