* Randy Dunlap <rdun...@infradead.org> wrote:
> On 9/3/19 8:50 AM, Andreas Smas wrote:
> > Hi,
> >
> > For me, kernels built including this commit
> > b059f801a937 (x86/purgatory: Use CFLAGS_REMOVE rather than reset
> > KBUILD_CFLAGS)
> >
> > results in kexec() failing to load the kernel:
> >
> > kexec: Undefined symbol: __stack_chk_fail
> > kexec-bzImage64: Loading purgatory failed
> >
> > Can be seen:
> >
> > $ readelf -a arch/x86/purgatory/purgatory.ro | grep UND
> > 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
> > 51: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __stack_chk_fail
> >
> > Using: gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
> >
> > Adding -ffreestanding or -fno-stack-protector to ccflags-y in
> > arch/x86/purgatory/Makefile
> > fixes the problem. Not sure which would be preferred.
> >
>
> Hi,
> Do you have a kernel .config file that causes this?
> I can't seem to reproduce it.
Does it go away with this fix in x86/urgent:
ca14c996afe7: ("x86/purgatory: Disable the stackleak GCC plugin for the
purgatory")
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/urgent
?
Thanks,
Ingo
