[v3,0/5] Add tests for Guarded Control Stack

  This patch adds AArch64 specific tests related to Guarded Control Stack [1].

It also adds new configure check for linker support for the "-z gcs=..."
option.

There might be better ways of arranging these tests in terms of using
the test framework of the library. Any feedback is appreciated.

These new tests are AArch64 specific. Moreover, they are included only
if linker supports the "-z gcs=<value>" option. If built, these tests
will run on systems with and without HWCAP_GCS. In the latter case the
tests will be reported as UNSUPPORTED.

When runtime target supports GCS, tests are run with all supported
values of the GCS tunable to check its effects.

Regression tested on aarch64 and no regressions have been found.

base commit: 9a31eb64db

OK for trunk?

[1] https://developer.arm.com/documentation/ddi0487/ka/ (chapter D11)

Changes since v2:
 - Added configure check for linker support of the "-z gcs=..." option
   to only enabled GCS related tests when it makes sense to do so.
 - Fixed typos in copyright years in some new files.

Changes since v1:
 - Fixed test compilation error due to undefine macro GCS_MAGIC.

Link to v1: https://inbox.sourceware.org/libc-alpha/20250123141401.3257507-1-yury.khrustalev@arm.com/

---

Yury Khrustalev (5):
  aarch64: Add configure check for linker support for -z gcs
  aarch64: Add tests for Guarded Control Stack
  aarch64: Add GCS tests for transitive dependencies
  aarch64: Add GCS tests for dlopen
  aarch64: Add GCS test with signal handler

 Makeconfig                                    |   2 +-
 configure                                     |  36 +++++
 configure.ac                                  |   5 +
 sysdeps/unix/sysv/linux/aarch64/Makefile      | 129 +++++++++++++++++-
 .../unix/sysv/linux/aarch64/tst-gcs-abort.sh  |  40 ++++++
 .../linux/aarch64/tst-gcs-disabled-static.c   |   1 +
 .../sysv/linux/aarch64/tst-gcs-disabled.c     |   2 +
 .../linux/aarch64/tst-gcs-dlopen-disabled.c   |   3 +
 .../linux/aarch64/tst-gcs-dlopen-enforced.c   |   3 +
 .../aarch64/tst-gcs-dlopen-optional-off.c     |   3 +
 .../aarch64/tst-gcs-dlopen-optional-on.c      |   3 +
 .../linux/aarch64/tst-gcs-dlopen-override.c   |   3 +
 .../unix/sysv/linux/aarch64/tst-gcs-dlopen.c  |  62 +++++++++
 .../linux/aarch64/tst-gcs-enforced-abort.c    |   2 +
 .../aarch64/tst-gcs-enforced-static-abort.c   |   1 +
 .../linux/aarch64/tst-gcs-enforced-static.c   |   1 +
 .../sysv/linux/aarch64/tst-gcs-enforced.c     |   2 +
 .../unix/sysv/linux/aarch64/tst-gcs-helper.h  |  39 ++++++
 .../unix/sysv/linux/aarch64/tst-gcs-mod1.c    |  27 ++++
 .../unix/sysv/linux/aarch64/tst-gcs-mod2.c    |  25 ++++
 .../unix/sysv/linux/aarch64/tst-gcs-mod3.c    |  25 ++++
 .../sysv/linux/aarch64/tst-gcs-noreturn.c     | 100 ++++++++++++++
 .../sysv/linux/aarch64/tst-gcs-optional-off.c |   2 +
 .../sysv/linux/aarch64/tst-gcs-optional-on.c  |   2 +
 .../aarch64/tst-gcs-optional-static-off.c     |   1 +
 .../aarch64/tst-gcs-optional-static-on.c      |   1 +
 .../linux/aarch64/tst-gcs-override-static.c   |   1 +
 .../sysv/linux/aarch64/tst-gcs-override.c     |   2 +
 .../linux/aarch64/tst-gcs-shared-disabled.c   |   2 +
 .../aarch64/tst-gcs-shared-enforced-abort.c   |   2 +
 .../linux/aarch64/tst-gcs-shared-optional.c   |   2 +
 .../linux/aarch64/tst-gcs-shared-override.c   |   2 +
 .../unix/sysv/linux/aarch64/tst-gcs-shared.c  |  41 ++++++
 .../sysv/linux/aarch64/tst-gcs-skeleton.c     |  43 ++++++
 34 files changed, 613 insertions(+), 2 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-abort.sh
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-disabled-static.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-disabled.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen-disabled.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen-enforced.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen-optional-off.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen-optional-on.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen-override.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-dlopen.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-enforced-abort.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-enforced-static-abort.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-enforced-static.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-enforced.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-helper.h
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-mod1.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-mod2.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-mod3.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-noreturn.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-optional-off.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-optional-on.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-optional-static-off.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-optional-static-on.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-override-static.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-override.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-shared-disabled.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-shared-enforced-abort.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-shared-optional.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-shared-override.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-shared.c
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-skeleton.c