2

I have looked around for this specific error however I did not find it, instead I found errors that are similar such as 'not supported by compiler'.

I am trying to compile Kernel version 4.8.8, i have patched it with grsecuirty if that makes any difference.

This is the entire error from the output command fakeroot make-kpkg --initrd kernel_image:

Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong available but compiler is broken
Makefile:1059: recipe for target 'prepare-compiler-check' failed
make[2]: *** [prepare-compiler-check] Error 1
make[2]: Leaving directory '/home/shurik/GrSec/linux-4.8.8'
debian/ruleset/targets/common.mk:194: recipe for target 'debian/stamp/conf/kernel-conf' failed
make[1]: *** [debian/stamp/conf/kernel-conf] Error 2
make[1]: Leaving directory '/home/shurik/GrSec/linux-4.8.8'
/usr/share/kernel-package/ruleset/minimal.mk:93: recipe for target 'debian/stamp/conf/minimal_debian' failed
make: *** [debian/stamp/conf/minimal_debian] Error 2
Failed to create a ./debian directory:  at /usr/bin/make-kpkg line 970.

Currently I am running Debian Sid x86_64, my compiler is gcc 6.2.0.

I tried compiling a simple C program with the -fstack-protector-strong flag and it was a success.

1

This is a problem with Linux and Debian, not Grsecurity. The bug has been noted.

Apply something like the following patch:

--- a/Makefile
+++ b/Makefile
@@ -622,6 +622,8 @@ include arch/$(SRCARCH)/Makefile
 KBUILD_CFLAGS  += $(call cc-option,-fno-delete-null-pointer-checks,)
 KBUILD_CFLAGS  += $(call cc-disable-warning,maybe-uninitialized,)
 KBUILD_CFLAGS  += $(call cc-disable-warning,frame-address,)
+KBUILD_CFLAGS  += $(call cc-option,-fno-PIE)
+KBUILD_AFLAGS  += $(call cc-option,-fno-PIE)

 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 KBUILD_CFLAGS  += $(call cc-option,-ffunction-sections,)

--- a/scripts/gcc-x86_64-has-stack-protector.sh
+++ b/scripts/gcc-x86_64-has-stack-protector.sh
@@ -1,6 +1,6 @@
 #!/bin/sh

-echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -O0 -mcmodel=kernel -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
+echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -O0 -mcmodel=kernel -fno-PIE -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
 if [ "$?" -eq "0" ] ; then
    echo y
 else

--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -16,6 +16,7 @@ KCOV_INSTRUMENT := n

 KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes -fno-zero-initialized-in-bss -fno-builtin -ffreestanding -c -MD -Os -mcmodel=large
 KBUILD_CFLAGS += -m$(BITS)
+KBUILD_CFLAGS += $(call cc-option,-fno-PIE)

 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
        $(call if_changed,ld)

Actually, the Makefile doesn't patch on 4.8.10 and requires some manual fiddling, but afterwards it works.

Or... wait. I think mainline will be fixed quickly.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.