Messages in this thread | | | From | Kees Cook <> | Date | Mon, 1 Aug 2016 12:45:09 -0700 | Subject | Re: Linker segfault on powerpc when CONFIG_LKDTM=y (was Re: [kernel-hardening] [PATCH 3/5] lkdtm: add function for testing .rodata section) |
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On Mon, Aug 1, 2016 at 5:37 AM, Michael Ellerman <mpe@ellerman.id.au> wrote: > Kees Cook <keescook@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@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.
Argh. Do you want a quick fix for this now? I can add a PPC CONFIG blacklist for the rodata check, maybe?
Also, what version of gcc? I'll see if I can reproduce this with a cross compiler...
-Kees
-- Kees Cook Chrome OS & Brillo Security
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