[PATCH v2 0/5] Improvements of the stackleak gcc plugin
alex.popov at linux.com
Wed Jun 24 08:33:25 EDT 2020
This is the v2 of the patch series with various improvements of the
stackleak gcc plugin.
The first three patches disable unneeded gcc plugin instrumentation for
The fourth patch is the main improvement. It eliminates an unwanted
side-effect of kernel code instrumentation performed by stackleak gcc
plugin. This patch is a deep reengineering of the idea described on
The final patch adds 'verbose' stackleak parameter for printing additional
info about the kernel code instrumentation during kernel building.
I would like to thank Alexander Monakov <amonakov at ispras.ru> for his
advisory on gcc internals.
This patch series was tested for gcc version 4.8, 5, 6, 7, 8, 9, and 10
on x86_64, i386 and arm64.
That was done using the project 'kernel-build-containers':
Changes from v1:
- rebase onto 5.8.0-rc2;
- don't exclude alloca() from the instrumentation logic, because it
will be used in kernel stack offset randomization;
- reorder patches in the series;
- don't use gcc plugins for building vgettimeofday.c in arm and
- follow alphabetic order in include/linux/compiler_attributes.h.
Link to v1:
Alexander Popov (5):
gcc-plugins/stackleak: Don't instrument itself
ARM: vdso: Don't use gcc plugins for building vgettimeofday.c
arm64: vdso: Don't use gcc plugins for building vgettimeofday.c
gcc-plugins/stackleak: Use asm instrumentation to avoid useless
gcc-plugins/stackleak: Add 'verbose' plugin parameter
arch/arm/vdso/Makefile | 2 +-
arch/arm64/kernel/vdso/Makefile | 2 +-
include/linux/compiler_attributes.h | 13 ++
kernel/Makefile | 1 +
kernel/stackleak.c | 16 +-
scripts/Makefile.gcc-plugins | 2 +
scripts/gcc-plugins/stackleak_plugin.c | 248 +++++++++++++++++++++----
7 files changed, 239 insertions(+), 45 deletions(-)
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