On Thu, Apr 08, 2021 at 11:28:25AM -0700, Sami Tolvanen wrote: > This series adds support for Clang's Control-Flow Integrity (CFI) > checking. With CFI, the compiler injects a runtime check before each > indirect function call to ensure the target is a valid function with > the correct static type. This restricts possible call targets and > makes it more difficult for an attacker to exploit bugs that allow the > modification of stored function pointers. For more details, see: > > https://clang.llvm.org/docs/ControlFlowIntegrity.html > > The first patch contains build system changes and error handling, > and implements support for cross-module indirect call checking. The > remaining patches address issues caused by the compiler > instrumentation. These include fixing known type mismatches, as well > as issues with address space confusion and cross-module function > address equality. > > These patches add support only for arm64, but I'll post patches also > for x86_64 after we address the remaining issues there, including > objtool support. > > You can also pull this series from > > https://github.com/samitolvanen/linux.git cfi-v6 This is working quite well for me and it looks like there are good reviews. I'm going to toss it in linux-next unless anyone has objections. I'm very excited to start using this. :) -Kees -- Kees Cook
