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kernel-yocto: conditionally enable stack protection checking on x86-64

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The kernel Makfile uses pkgconfig to check for libelf when enabling
CONFIG_STACK_VALIDATION. We already have libelf in our DEPENDS, but
the kernel Makefiles hardcode 'pkgconfig', so fail to pick up our
pkgconfig-native binary that would report the correct flags and paths
for libelf support.

Rather than patching the kernel Makefile's to use pkgconfig-native,
we can use the KERNEL_EXTRA_ARGS variable to pass the definition of
HOST_LIBELF_LIBS via the kernel build commmand line.

We conditionally set HOST_LIBELF_LIBS based on "stack" being in
a newly introduced variable KERNEL_DEBUG_OPTIONS. The value of
HOST_LIBELF_LIBS is the same as pkgconfig-native would set in a
kernel build (but we cannot call pkgconfig at the point this
variable is set).

(From OE-Core rev: 0ad2b69dace6ac851c1f0bdae6a3c41045fc2d1d)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bruce Ashfield 2021-11-23 16:57:31 -05:00 committed by Richard Purdie
parent 30d1eb3841
commit cccb8f4242
1 changed files with 4 additions and 0 deletions
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4
meta/recipes-kernel/linux/linux-yocto.inc
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@ -46,6 +46,7 @@ LINUX_VERSION_EXTENSION ??= "-yocto-${LINUX_KERNEL_TYPE}"
# Pick up shared functions
inherit kernel
inherit kernel-yocto
inherit pkgconfig
B = "${WORKDIR}/linux-${PACKAGE_ARCH}-${LINUX_KERNEL_TYPE}-build"
@ -57,3 +58,6 @@ do_install:append(){
# enable kernel-sample for oeqa/runtime/cases's ksample.py test
KERNEL_FEATURES:append:qemuall=" features/kernel-sample/kernel-sample.scc"
KERNEL_DEBUG_OPTIONS ?= "stack"
KERNEL_EXTRA_ARGS:append:x86-64 = "${@bb.utils.contains('KERNEL_DEBUG_OPTIONS', 'stack', 'HOST_LIBELF_LIBS="-L${RECIPE_SYSROOT_NATIVE}/usr/lib/pkgconfig/../../../usr/lib/ -lelf"', '', d)}"