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ANDROID: kbuild: disable GCOV with CFI

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With GCOV enabled, LLVM generates calls to compiler-generated
__llvm_gcov_* functions, but doesn't add them to the CFI jump
table, which trips indirect call checking. Work around the issue
by disabling CFI when GCOV_KERNEL is enabled.

Bug: 169124292
Change-Id: Ifd60cd9eda2bcdd86838ac5ce41bb0dbc00d602f
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
(cherry picked from commit 93a4197bc23a4a6967ff0592d07f3cf4cd69b1d6)
This commit is contained in:
Sami Tolvanen 2020-10-12 14:17:56 -07:00 • committed by Matthias Maennich
commit e675b8a59a
1 changed files with 1 additions and 0 deletions
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arch/Kconfig
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@ -605,6 +605,7 @@ endchoice
config CFI_CLANG
bool "Use Clang's Control Flow Integrity (CFI)"
depends on LTO_CLANG && KALLSYMS
depends on !GCOV_KERNEL
help
This option enables Clang's Control Flow Integrity (CFI), which adds
runtime checking for indirect function calls.