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authorSami Tolvanen <samitolvanen@google.com>2020-04-27 09:00:07 -0700
committerWill Deacon <will@kernel.org>2020-05-15 16:35:45 +0100
commitd08b9f0ca6605e13dcb48f04e55a30545b3c71eb (patch)
tree177893706ae16d9302dda4ee5f4894ac02e9b24e /Makefile
parent6a8b55ed4056ea5559ebe4f6a4b247f627870d4c (diff)
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scs: Add support for Clang's Shadow Call Stack (SCS)
This change adds generic support for Clang's Shadow Call Stack, which uses a shadow stack to protect return addresses from being overwritten by an attacker. Details are available here: https://clang.llvm.org/docs/ShadowCallStack.html Note that security guarantees in the kernel differ from the ones documented for user space. The kernel must store addresses of shadow stacks in memory, which means an attacker capable reading and writing arbitrary memory may be able to locate them and hijack control flow by modifying the stacks. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> [will: Numerous cosmetic changes] Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile6
1 files changed, 6 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 679f302a8b8b..33dc0d0cdd08 100644
--- a/Makefile
+++ b/Makefile
@@ -866,6 +866,12 @@ ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif
+ifdef CONFIG_SHADOW_CALL_STACK
+CC_FLAGS_SCS := -fsanitize=shadow-call-stack
+KBUILD_CFLAGS += $(CC_FLAGS_SCS)
+export CC_FLAGS_SCS
+endif
+
# arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)