Re: [PULL 13/31] tests/tcg: Add the PROT_NONE gdbstub test

[Ilya Leoshkevich <iii@linux.ibm.com>]

On Tue, 2024-01-30 at 09:01 +1000, Richard Henderson wrote:
> From: Ilya Leoshkevich <iii@linux.ibm.com>
> 
> Make sure that qemu gdbstub, like gdbserver, allows reading from and
> writing to PROT_NONE pages.
> 
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> Message-Id: <20240129093410.3151-4-iii@linux.ibm.com>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tests/tcg/multiarch/prot-none.c          | 40
> ++++++++++++++++++++++++
>  tests/tcg/multiarch/Makefile.target      |  9 +++++-
>  tests/tcg/multiarch/gdbstub/prot-none.py | 36 +++++++++++++++++++++
>  3 files changed, 84 insertions(+), 1 deletion(-)
>  create mode 100644 tests/tcg/multiarch/prot-none.c
>  create mode 100644 tests/tcg/multiarch/gdbstub/prot-none.py

[...]

> diff --git a/tests/tcg/multiarch/gdbstub/prot-none.py
> b/tests/tcg/multiarch/gdbstub/prot-none.py
> new file mode 100644
> index 0000000000..e829d3ebc5
> --- /dev/null
> +++ b/tests/tcg/multiarch/gdbstub/prot-none.py
> @@ -0,0 +1,36 @@
> +"""Test that GDB can access PROT_NONE pages.
> +
> +This runs as a sourced script (via -x, via run-test.py).
> +
> +SPDX-License-Identifier: GPL-2.0-or-later
> +"""
> +import ctypes
> +from test_gdbstub import main, report
> +
> +
> +def probe_proc_self_mem():
> +    buf = ctypes.create_string_buffer(b'aaa')
> +    try:
> +        with open("/proc/self/mem", "rb") as fp:
> +            fp.seek(ctypes.addressof(buf))
> +            return fp.read(3) == b'aaa'
> +    except OSError:
> +        return False
> +
> +
> +def run_test():
> +    """Run through the tests one by one"""
> +    if not probe_proc_self_mem:

I noticed that I made an embarrassing typo here: this should be
`not probe_proc_self_mem()`. I posted a v5 with the correction.

[...]