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ANDROID: arm64: disable BTI with CFI for Clang <12

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Older versions of Clang didn't generate BTI instructions for the
compiler-generated CFI check functions. As CFI provides a more
fine-grained control-flow checking then BTI, disable BTI when CFI is
enabled and we're using Clang <12.

Bug: 145210207
Change-Id: I248bc761443e4f354cf4dfbfc3db0fc22385ce63
Link: https://bugs.llvm.org/show_bug.cgi?id=46258
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2020-06-08 14:18:21 -07:00
committed by Alistair Delva
parent 2df99b6397
commit 5f5334aba7
1 changed files with 2 additions and 0 deletions
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arch/arm64/Kconfig
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@@ -1627,6 +1627,8 @@ config ARM64_BTI_KERNEL
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
depends on !CC_IS_GCC || GCC_VERSION >= 100100
depends on !(CC_IS_CLANG && GCOV_KERNEL)
# https://bugs.llvm.org/show_bug.cgi?id=46258
depends on !CFI_CLANG || CLANG_VERSION >= 120000
depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
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Build the kernel with Branch Target Identification annotations