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CMake: Add hardening flags

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- `-fstack-protection-strong` enables stack canaries for functions where
  addresses of local variables are taken or arrays/structures
  containing arrays are allocated on the stack.
- `-fstrict-flex-arrays=2` causes the compiler to only treat arrays with
  unknown bounds (`[]`) or zero-length-arrays (`[0]`) as *flexible array
  members*, allowing the sanitizers to emit bounds checks for structs
  with proper arrays as their last member.

More rigorous options (such as AArch64 pointer authentication, Control
Flow Integrity, _FORTIFY_SOURCE) should be investigated in the future,
however this is a good baseline.
This commit is contained in:
Daniel Bertalan 2024-07-14 19:06:09 +02:00
parent c62240aa80
commit a4645060e6
Notes: sideshowbarker 2024-07-18 08:27:11 +09:00
1 changed files with 7 additions and 0 deletions
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7
Meta/CMake/common_compile_options.cmake
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@ -69,3 +69,10 @@ if (UNIX AND NOT APPLE AND NOT ENABLE_FUZZERS)
add_compile_options(-fno-semantic-interposition)
add_compile_options(-fvisibility-inlines-hidden)
endif()
if (NOT WIN32)
add_compile_options(-fstack-protector-strong)
add_link_options(-fstack-protector-strong)
endif()
add_compile_options(-fstrict-flex-arrays=2)