Messages in this thread | | | Date | Wed, 6 Dec 2017 08:44:53 +0100 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH 4.4 02/96] s390/runtime instrumention: fix possible memory corruption |
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On Tue, Dec 05, 2017 at 07:15:34PM +0100, Heiko Carstens wrote: > On Tue, Dec 05, 2017 at 06:08:47PM +0100, Greg Kroah-Hartman wrote: > > On Tue, Dec 05, 2017 at 05:02:32PM +0000, Ben Hutchings wrote: > > > On Tue, 2017-11-28 at 11:22 +0100, Greg Kroah-Hartman wrote: > > > > 4.4-stable review patch. If anyone has any objections, please let me know. > > > > > > > > ------------------ > > > > > > > > From: Heiko Carstens <heiko.carstens@de.ibm.com> > > > > > > > > commit d6e646ad7cfa7034d280459b2b2546288f247144 upstream. > > > [...] > > > > --- a/arch/s390/kernel/runtime_instr.c > > > > +++ b/arch/s390/kernel/runtime_instr.c > > > > @@ -47,11 +47,13 @@ void exit_thread_runtime_instr(void) > > > > { > > > > struct task_struct *task = current; > > > > > > > > + preempt_disable(); > > > > if (!task->thread.ri_cb) > > > > return; > > > > > > This return path now leaves preemption disabled. This seems to have > > > been fixed upstream by commit 8d9047f8b967 "s390/runtime > > > instrumentation: simplify task exit handling". > > > > "simplify" doesn't seem to imply "fixes a bug" :) > > Indeed ;) That where two subsequent patches, but incorrectly split by me... > > > Heiko, should I also queue this patch up? > > Yes, please.
It doesn't apply to 4.9-stable or 4.4-stable, can you provide a working backport?
thanks,
greg k-h
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