Re: [PATCH v7 4/4] elf: Add a test for PT_LOAD segments with invalid p_align [BZ #28688]

[Adhemerval Zanella <adhemerval.zanella@linaro.org>]

On 03/01/2022 20:04, H.J. Lu wrote:
> Build tst-p_alignmod3.so with 256 byte page size and verify that it is
> rejected with a proper error message.
> ---
>  elf/Makefile          | 11 +++++++++++
>  elf/tst-p_align3.c    | 27 +++++++++++++++++++++++++++
>  elf/tst-p_align3.sh   | 26 ++++++++++++++++++++++++++
>  elf/tst-p_alignmod3.c | 22 ++++++++++++++++++++++
>  4 files changed, 86 insertions(+)
>  create mode 100644 elf/tst-p_align3.c
>  create mode 100755 elf/tst-p_align3.sh
>  create mode 100644 elf/tst-p_alignmod3.c
> 
> diff --git a/elf/Makefile b/elf/Makefile
> index e4be3fa518..eca730ae8f 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -409,6 +409,10 @@ tests += \
>    tst-p_alignmod2-edit \
>    tst-p_align1 \
>    tst-p_align2 \
> +  tst-p_align3 \
> +
> +modules-names += \
> +  tst-p_alignmod3 \
>  
>  endif
>  
> @@ -2110,3 +2114,10 @@ $(objpfx)tst-p_alignmod2.so: $(objpfx)tst-p_alignmod2-edit \
>  	cp $(objpfx)tst-alignmod3.so $@
>  	$(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
>  	  $(objpfx)tst-p_alignmod2-edit $@
> +
> +LDFLAGS-tst-p_alignmod3.so += -Wl,-z,max-page-size=0x100,-z,common-page-size=0x100
> +
> +$(objpfx)tst-p_align3: $(objpfx)tst-p_alignmod3.so
> +$(objpfx)tst-p_align3.out: tst-p_align3.sh $(objpfx)tst-p_align3
> +	$(SHELL) $< $(common-objpfx) '$(test-program-prefix)'; \
> +	$(evaluate-test)
> diff --git a/elf/tst-p_align3.c b/elf/tst-p_align3.c
> new file mode 100644
> index 0000000000..61c616ac3b
> --- /dev/null
> +++ b/elf/tst-p_align3.c
> @@ -0,0 +1,27 @@
> +/* Check invalid p_align of PT_LOAD segments in a shared library.
> +   Copyright (C) 2021 Free Software Foundation, Inc.

Update Copyright years.

> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +extern int do_load_test (void);

As before, do_load_test returns void.

> +
> +static int
> +do_test (void)
> +{
> +  return do_load_test ();
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/elf/tst-p_align3.sh b/elf/tst-p_align3.sh
> new file mode 100755
> index 0000000000..11572aa217
> --- /dev/null
> +++ b/elf/tst-p_align3.sh
> @@ -0,0 +1,26 @@
> +#!/bin/sh
> +# Check invalid p_align of PT_LOAD segments in a shared library.
> +# Copyright (C) 2021 Free Software Foundation, Inc.

Update Copyright years.

> +# This file is part of the GNU C Library.
> +
> +# The GNU C Library is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU Lesser General Public
> +# License as published by the Free Software Foundation; either
> +# version 2.1 of the License, or (at your option) any later version.
> +
> +# The GNU C Library is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +# Lesser General Public License for more details.
> +
> +# You should have received a copy of the GNU Lesser General Public
> +# License along with the GNU C Library; if not, see
> +# <https://www.gnu.org/licenses/>.
> +
> +common_objpfx=$1; shift
> +test_program_prefix=$1; shift
> +
> +${test_program_prefix} \
> +  ${common_objpfx}elf/tst-p_align3 \
> +    2> ${common_objpfx}elf/tst-p_align3.out && exit 1

I think we should test for command exit output:

  test $? -ne 127 && exit 1

> +grep "ELF load command address/offset not page-aligned" ${common_objpfx}elf/tst-p_align3.out
> diff --git a/elf/tst-p_alignmod3.c b/elf/tst-p_alignmod3.c
> new file mode 100644
> index 0000000000..90f3af467e
> --- /dev/null
> +++ b/elf/tst-p_alignmod3.c
> @@ -0,0 +1,22 @@
> +/* Check invalid p_align of PT_LOAD segment in a shared library.
> +   Copyright (C) 2021 Free Software Foundation, Inc.


Update Copyright years.

> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +void
> +do_load_test (void)
> +{
> +}