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charset="utf-8" reloc.S and cmdline.S as arrays of executable bytes for inclusion in head.S generated from compiled object files. Object files generated by an -fcf-protection toolchain include a .note.gnu.property section. The way reloc.S and cmdline.S are generated, the bytes of .note.gnu.property become the start of the .S files. When head.S calls reloc or cmdline_parse_early, those note bytes are executed instead of the intended .text section. This results in an early crash in reloc. Discard the .note.gnu.property section when linking to avoid the extra bytes. Stefan Bader also noticed that build32.mk requires -fcf-protection=3Dnone or else the hypervisor will not boot. https://bugs.launchpad.net/ubuntu/+source/gcc-9/+bug/1863260 CC: Stefan Bader Signed-off-by: Jason Andryuk --- xen/arch/x86/boot/build32.lds | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/xen/arch/x86/boot/build32.lds b/xen/arch/x86/boot/build32.lds index da35aee910..0f69765579 100644 --- a/xen/arch/x86/boot/build32.lds +++ b/xen/arch/x86/boot/build32.lds @@ -48,5 +48,10 @@ SECTIONS * Please check build32.mk for more details. */ /* *(.got.plt) */ + /* + * The note will end up before the .text section and be called + * incorrectly as instructions. + */ + *(.note.gnu.property) } } --=20 2.25.1