* 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