3bd8783207
These flags can't be used at the same time as any of the other sanitizers. We add an equivalent flag to -static-libasan in -static-libhwasan to ensure static linking. The -fsanitize=kernel-hwaddress option is for compiling targeting the kernel. This flag has defaults to match the LLVM implementation and sets some other behaviors to work in the kernel (e.g. accounting for the fact that the stack pointer will have 0xff in the top byte and to not call the userspace library initialisation routines). The defaults are that we do not sanitize variables on the stack and always recover from a detected bug. Since we are introducing a few more conflicts between sanitizer flags we refactor the checking for such conflicts to use a helper function which makes checking for such conflicts more easy and consistent. We introduce a backend hook `targetm.memtag.can_tag_addresses` that indicates to the mid-end whether a target has a feature like AArch64 TBI where the top byte of an address is ignored. Without this feature hwasan sanitization is not done. gcc/ChangeLog: * common.opt (flag_sanitize_recover): Default for kernel hwaddress. (static-libhwasan): New cli option. * config/aarch64/aarch64.c (aarch64_can_tag_addresses): New. (TARGET_MEMTAG_CAN_TAG_ADDRESSES): New. * config/gnu-user.h (LIBHWASAN_EARLY_SPEC): hwasan equivalent of asan command line flags. * cppbuiltin.c (define_builtin_macros_for_compilation_flags): Add hwasan equivalent of __SANITIZE_ADDRESS__. * doc/invoke.texi: Document hwasan command line flags. * doc/tm.texi: Document new hook. * doc/tm.texi.in: Document new hook. * flag-types.h (enum sanitize_code): New sanitizer values. * gcc.c (STATIC_LIBHWASAN_LIBS): New macro. (LIBHWASAN_SPEC): New macro. (LIBHWASAN_EARLY_SPEC): New macro. (SANITIZER_EARLY_SPEC): Update to include hwasan. (SANITIZER_SPEC): Update to include hwasan. (sanitize_spec_function): Use hwasan options. * opts.c (finish_options): Describe conflicts between address sanitizers. (find_sanitizer_argument): New. (report_conflicting_sanitizer_options): New. (sanitizer_opts): Introduce new sanitizer flags. (common_handle_option): Add defaults for kernel sanitizer. * params.opt (hwasan--instrument-stack): New (hwasan-random-frame-tag): New (hwasan-instrument-allocas): New (hwasan-instrument-reads): New (hwasan-instrument-writes): New (hwasan-instrument-mem-intrinsics): New * target.def (HOOK_PREFIX): Add new hook. (can_tag_addresses): Add new hook under memtag prefix. * targhooks.c (default_memtag_can_tag_addresses): New. * targhooks.h (default_memtag_can_tag_addresses): New decl. * toplev.c (process_options): Ensure hwasan only on architectures that advertise the possibility. |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
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| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
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| libobjc | ||
| liboffloadmic | ||
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| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
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