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authorAlexander Popov <alex.popov@linux.com>2020-06-24 15:33:27 +0300
committerKees Cook <keescook@chromium.org>2020-06-24 17:48:27 +0300
commitddfaf0e43e9bd4341dc2c24d48ac218f2fb1530a (patch)
tree852de6402040c64b01d3c83bb1f0159119c9802a /arch/arm/vdso
parent005e696df65d0ff90468ecf38a50aa584dc82421 (diff)
downloadlinux-ddfaf0e43e9bd4341dc2c24d48ac218f2fb1530a.tar.xz
ARM: vdso: Don't use gcc plugins for building vgettimeofday.c
Don't use gcc plugins for building arch/arm/vdso/vgettimeofday.c to avoid unneeded instrumentation. As previously discussed[1]: arm_ssp_per_task_plugin.c 32-bit ARM only (but likely needs disabling for 32-bit ARM vDSO?) cyc_complexity_plugin.c compile-time reporting only latent_entropy_plugin.c this shouldn't get triggered for the vDSO (no __latent_entropy nor __init attributes in vDSO), but perhaps explicitly disabling it would be a sensible thing to do, just for robustness? randomize_layout_plugin.c this shouldn't get triggered (again, lacking attributes), but should likely be disabled too. sancov_plugin.c This should be tracking the KCOV directly (see scripts/Makefile.kcov), which is already disabled here. structleak_plugin.c This should be fine in the vDSO, but there's no security boundary here, so it wouldn't be important to KEEP it enabled. [1] https://lore.kernel.org/lkml/20200610073046.GA15939@willie-the-truck/ Signed-off-by: Alexander Popov <alex.popov@linux.com> Link: https://lore.kernel.org/r/20200624123330.83226-3-alex.popov@linux.com Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'arch/arm/vdso')
-rw-r--r--arch/arm/vdso/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index d3c9f03e7e79..a54f70731d9f 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -29,7 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
CFLAGS_REMOVE_vdso.o = -pg
# Force -O2 to avoid libgcc dependencies
-CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
+CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(GCC_PLUGINS_CFLAGS)
ifeq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday.o = -O2
else