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| author | gejin <ge.jin@intel.com> | 2021-08-26 16:20:38 +0800 |
|---|---|---|
| committer | gejin <ge.jin@intel.com> | 2021-08-26 16:20:38 +0800 |
| commit | 21b25a1fb32ecd2e1f336123c2715f8ef1a49f97 (patch) | |
| tree | 579b8628fe5a573f1852e82d0e298b694aea3000 /libunwind/test | |
| parent | 9016b2a1cae244eb8f26826427eeb90eded0da20 (diff) | |
| download | llvm-21b25a1fb32ecd2e1f336123c2715f8ef1a49f97.zip llvm-21b25a1fb32ecd2e1f336123c2715f8ef1a49f97.tar.gz llvm-21b25a1fb32ecd2e1f336123c2715f8ef1a49f97.tar.bz2 | |
[libunwind] Support stack unwind in CET environment
Control-flow Enforcement Technology (CET), published by Intel,
introduces shadow stack feature aiming to ensure a return from
a function is directed to where the function was called.
In a CET enabled system, each function call will push return
address into normal stack and shadow stack, when the function
returns, the address stored in shadow stack will be popped and
compared with the return address, program will fail if the 2
addresses don't match.
In exception handling, the control flow may skip some stack frames
and we must adjust shadow stack to avoid violating CET restriction.
In order to achieve this, we count the number of stack frames skipped
and adjust shadow stack by this number before jumping to landing pad.
Reviewed By: hjl.tools, compnerd, MaskRay
Differential Revision: https://reviews.llvm.org/D105968
Signed-off-by: gejin <ge.jin@intel.com>
Diffstat (limited to 'libunwind/test')
| -rw-r--r-- | libunwind/test/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | libunwind/test/libunwind/test/config.py | 2 | ||||
| -rw-r--r-- | libunwind/test/lit.site.cfg.in | 1 |
3 files changed, 4 insertions, 0 deletions
diff --git a/libunwind/test/CMakeLists.txt b/libunwind/test/CMakeLists.txt index ae83ea9..932a6e3 100644 --- a/libunwind/test/CMakeLists.txt +++ b/libunwind/test/CMakeLists.txt @@ -12,6 +12,7 @@ if (NOT DEFINED LIBCXX_ENABLE_SHARED) endif() pythonize_bool(LIBUNWIND_BUILD_32_BITS) +pythonize_bool(LIBUNWIND_ENABLE_CET) pythonize_bool(LIBCXX_ENABLE_SHARED) pythonize_bool(LIBUNWIND_ENABLE_SHARED) pythonize_bool(LIBUNWIND_ENABLE_THREADS) diff --git a/libunwind/test/libunwind/test/config.py b/libunwind/test/libunwind/test/config.py index 18919c2..2aa3b82 100644 --- a/libunwind/test/libunwind/test/config.py +++ b/libunwind/test/libunwind/test/config.py @@ -50,6 +50,8 @@ class Configuration(LibcxxConfiguration): if not self.get_lit_bool('enable_threads', True): self.cxx.compile_flags += ['-D_LIBUNWIND_HAS_NO_THREADS'] self.config.available_features.add('libunwind-no-threads') + if self.get_lit_bool('x86_cet', False): + self.cxx.compile_flags += ['-fcf-protection=full'] super(Configuration, self).configure_compile_flags() def configure_compile_flags_header_includes(self): diff --git a/libunwind/test/lit.site.cfg.in b/libunwind/test/lit.site.cfg.in index ef2ebd9..be98070 100644 --- a/libunwind/test/lit.site.cfg.in +++ b/libunwind/test/lit.site.cfg.in @@ -27,6 +27,7 @@ config.host_triple = "@LLVM_HOST_TRIPLE@" config.sysroot = "@LIBUNWIND_SYSROOT@" config.gcc_toolchain = "@LIBUNWIND_GCC_TOOLCHAIN@" config.cxx_ext_threads = @LIBUNWIND_BUILD_EXTERNAL_THREAD_LIBRARY@ +config.x86_cet = @LIBUNWIND_ENABLE_CET@ site.addsitedir(os.path.join(config.libunwind_src_root, 'test')) site.addsitedir(os.path.join(config.libcxx_src_root, 'utils')) |