Dne 14.11.2016 v 19:51 Borislav Petkov napsal(a): > From: Borislav Petkov <bp@xxxxxxx> > > So Sebastian turned off the PIE for kernel builds but that was too late > - Kbuild.include already uses KBUILD_CFLAGS and trying to disable gcc > options with, say cc-disable-warning, fails: > > gcc -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs > ... > -Wno-sign-compare -fno-asynchronous-unwind-tables -Wframe-address -c -x c /dev/null -o .31392.tmp > /dev/null:1:0: error: code model kernel does not support PIC mode > > because that returns an error and we can't disable the warning. For > example in this case: > > KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) > > which leads to gcc issuing all those warnings again. > > So let's turn off PIE/PIC at the earliest possible moment, when we > declare KBUILD_CFLAGS so that cc-disable-warning picks it up too. > > Signed-off-by: Borislav Petkov <bp@xxxxxxx> > Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx> > Cc: Michal Marek <mmarek@xxxxxxxx> > Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> > --- > Makefile | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/Makefile b/Makefile > index 3ff1fb26d8b2..5558cc5b1505 100644 > --- a/Makefile > +++ b/Makefile > @@ -399,11 +399,12 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ > -fno-strict-aliasing -fno-common \ > -Werror-implicit-function-declaration \ > -Wno-format-security \ > - -std=gnu89 > + -std=gnu89 -fno-PIE Please use the cc-option variant, otherwise good catch. Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
