Linker segfault on powerpc when CONFIG_LKDTM=y (was Re: [kernel-hardening] [PATCH 3/5] lkdtm: add function for testing .rodata section)

[Michael Ellerman]

Kees Cook <keescook at chromium.org> writes:

> This adds a function that lives in the .rodata section. The section
> flags are corrected using objcopy since there is no way with gcc to
> declare section flags in an architecture-agnostic way.
>
> Signed-off-by: Kees Cook <keescook at chromium.org>
> ---
>  drivers/misc/Makefile       |  7 +++++++
>  drivers/misc/lkdtm.h        |  6 ++++++
>  drivers/misc/lkdtm_core.c   | 24 +++++++++++++++++-------
>  drivers/misc/lkdtm_rodata.c | 10 ++++++++++
>  4 files changed, 40 insertions(+), 7 deletions(-)
>  create mode 100644 drivers/misc/lkdtm.h
>  create mode 100644 drivers/misc/lkdtm_rodata.c

This is blowing up my linker :(

  scripts/link-vmlinux.sh: line 52: 36260 Segmentation fault      (core dumped) ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} -T ${lds} ${KBUILD_VMLINUX_INIT} --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}

Haven't had a chance to debug it further.

cheers