[PATCH v7 3/4] elf: Add a test for PT_LOAD segments with p_align == 1 [BZ #28688]

[Adhemerval Zanella]

On 03/01/2022 20:04, H.J. Lu wrote:
> Add tst-p_alignmod2-edit to edit the copy of tst-alignmod3.so to set
> p_align of the first PT_LOAD segment to 1 and verify that the shared
> library can be loaded normally.
> ---
>  elf/Makefile               | 13 +++++++++++++
>  elf/tst-p_align2.c         | 27 +++++++++++++++++++++++++++
>  elf/tst-p_alignmod2-edit.c | 27 +++++++++++++++++++++++++++
>  3 files changed, 67 insertions(+)
>  create mode 100644 elf/tst-p_align2.c
>  create mode 100644 elf/tst-p_alignmod2-edit.c
> 
> diff --git a/elf/Makefile b/elf/Makefile
> index 9c831faac1..e4be3fa518 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -406,7 +406,9 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
>  ifeq (yes,$(build-shared))
>  tests += \
>    tst-p_alignmod1-edit \
> +  tst-p_alignmod2-edit \
>    tst-p_align1 \
> +  tst-p_align2 \
>  

Maybe add a #test as final member?

>  endif
>  
> @@ -2097,3 +2099,14 @@ $(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod1-edit \
>  	cp $(objpfx)tst-alignmod3.so $@
>  	$(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
>  	  $(objpfx)tst-p_alignmod1-edit $@
> +
> +$(objpfx)tst-p_align2: $(objpfx)tst-p_alignmod2.so
> +
> +# Make a copy of tst-alignmod3.so and update p_align of the first PT_LOAD
> +# segment.
> +$(objpfx)tst-p_alignmod2.so: $(objpfx)tst-p_alignmod2-edit \
> +			     $(objpfx)tst-alignmod3.so

Same as previous patch, it uses tst-alignmod3.so which only defined in next one.

> +	rm -f $@
> +	cp $(objpfx)tst-alignmod3.so $@
> +	$(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
> +	  $(objpfx)tst-p_alignmod2-edit $@
> diff --git a/elf/tst-p_align2.c b/elf/tst-p_align2.c
> new file mode 100644
> index 0000000000..cab9793220
> --- /dev/null
> +++ b/elf/tst-p_align2.c
> @@ -0,0 +1,27 @@
> +/* Check different alignments of PT_LOAD segments in a shared library.
> +   Copyright (C) 2021 Free Software Foundation, Inc.

Update the Copyright year.

> +   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);
> +
> +static int
> +do_test (void)
> +{
> +  return do_load_test ();
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/elf/tst-p_alignmod2-edit.c b/elf/tst-p_alignmod2-edit.c
> new file mode 100644
> index 0000000000..2f47b37c9e
> --- /dev/null
> +++ b/elf/tst-p_alignmod2-edit.c
> @@ -0,0 +1,27 @@
> +/* Set p_align of the first PT_LOAD segment to 1.
> +   Copyright (C) 2021 Free Software Foundation, Inc.
> +   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/>.  */
> +
> +#include "tst-elf-edit.h"
> +
> +/* Set p_align to 1.  */
> +
> +static size_t
> +update_p_align (size_t p_align __attribute__ ((unused)))
> +{
> +  return 1;
> +}