[PATCH 12/15] arm64: add a workaround for GNU gold with ARM64_MODULE_PLTS
From: samitolvanen@google.com (Sami Tolvanen)
Date: 2017-11-03 17:13:04
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
CONFIG_CLANG_LTO depends on GNU gold and due to a known bug, the linker crashes when ARM64_MODULE_PLTS is enabled: https://sourceware.org/bugzilla/show_bug.cgi?id=14592 To work around the problem, this change: 1) Enables ARM64_MODULE_PLTS only when it's needed, i.e. when RANDOMIZE_MODULE_REGION_FULL is selected, 2) and disables RANDOMIZE_MODULE_REGION_FULL with clang LTO. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/arm64/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 43ccddb7c8ec..a301fdc90319 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -997,8 +997,8 @@ config RELOCATABLE config RANDOMIZE_BASE bool "Randomize the address of the kernel image" - select ARM64_MODULE_PLTS if MODULES select RELOCATABLE + select ARM64_MODULE_PLTS if RANDOMIZE_MODULE_REGION_FULL help Randomizes the virtual address at which the kernel image is loaded, as a security feature that deters exploit attempts
@@ -1016,7 +1016,7 @@ config RANDOMIZE_BASE config RANDOMIZE_MODULE_REGION_FULL bool "Randomize the module region independently from the core kernel" - depends on RANDOMIZE_BASE + depends on RANDOMIZE_BASE && !CLANG_LTO default y help Randomizes the location of the module region without considering the
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2.15.0.403.gc27cc4dac6-goog