[v2] elf: Add ld.so test with non-existing program name

None of the existing tests seem to cover the case where
_dl_signal_error is called without an active error handler.
The new elf/tst-rtld-does-not-exist test triggers such a
_dl_signal_error call from _dl_map_object.

---
v2: Delete temporary file.

 elf/Makefile                   |  7 +++++++
 elf/tst-rtld-does-not-exist.sh | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)


base-commit: f8d8b1b1e6d3b8b93f224efc796b7ea083fdb83f

On Mon, Apr 8, 2024 at 9:43 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> None of the existing tests seem to cover the case where
> _dl_signal_error is called without an active error handler.
> The new elf/tst-rtld-does-not-exist test triggers such a
> _dl_signal_error call from _dl_map_object.
>
> ---
> v2: Delete temporary file.
>
>  elf/Makefile                   |  7 +++++++
>  elf/tst-rtld-does-not-exist.sh | 39 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+)
>
> diff --git a/elf/Makefile b/elf/Makefile
> index 4f1903391a..6dad11bcfb 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -621,6 +621,13 @@ $(objpfx)tst-valgrind-smoke.out: tst-valgrind-smoke.sh $(objpfx)ld.so $(objpfx)v
>                 '$(run-program-env)' '$(rpath-link)' $(objpfx)valgrind-test \
>                 '$(valgrind-suppressions-tst-valgrind-smoke)' > $@; $(evaluate-test)
>
> +ifeq ($(run-built-tests),yes)
> +tests-special += $(objpfx)tst-rtld-does-not-exist.out
> +endif
> +$(objpfx)tst-rtld-does-not-exist.out: tst-rtld-does-not-exist.sh $(objpfx)ld.so
> +       $(SHELL) $< $(objpfx)ld.so > $@; \
> +       $(evaluate-test)
> +
>  tests += $(tests-execstack-$(have-z-execstack))
>  ifeq ($(run-built-tests),yes)
>  tests-special += \
> diff --git a/elf/tst-rtld-does-not-exist.sh b/elf/tst-rtld-does-not-exist.sh
> new file mode 100644
> index 0000000000..a4a781ccfd
> --- /dev/null
> +++ b/elf/tst-rtld-does-not-exist.sh
> @@ -0,0 +1,39 @@
> +#!/bin/sh
> +# Check that running ld.so with a non-existing file prints an error.
> +# Copyright (C) 2024 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/>.
> +
> +export LC_ALL=C
> +
> +rtld="$1"
> +tmp_out="$(mktemp)"
>

Does this construct require bash?

> +$rtld program-does-not-exist 2>"$tmp_out"
> +status=$?
> +echo "$rtld exit status: $status"
> +echo "output (with expected error):"
> +cat "$tmp_out"
> +
> +if test $status -eq 127 \
> +       && grep -q "^program-does-not-exist: error while loading shared libraries: program-does-not-exist: cannot open shared object file$" "$tmp_out" \
> +       && test "$(wc -l < "$tmp_out")" -eq 1 ; then
> +    status=0
> +else
> +    status=1
> +fi
> +rm "$tmp_out"
> +exit $status
>
> base-commit: f8d8b1b1e6d3b8b93f224efc796b7ea083fdb83f
>

* H. J. Lu:

>> +tmp_out="$(mktemp)"

> Does this construct require bash?

No, POSIX sh supports both $(…) and `…` for command expansion.

Thanks,
Florian

On Mon, Apr 8, 2024 at 9:43 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> None of the existing tests seem to cover the case where
> _dl_signal_error is called without an active error handler.
> The new elf/tst-rtld-does-not-exist test triggers such a
> _dl_signal_error call from _dl_map_object.
>
> ---
> v2: Delete temporary file.
>
>  elf/Makefile                   |  7 +++++++
>  elf/tst-rtld-does-not-exist.sh | 39 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+)
>
> diff --git a/elf/Makefile b/elf/Makefile
> index 4f1903391a..6dad11bcfb 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -621,6 +621,13 @@ $(objpfx)tst-valgrind-smoke.out: tst-valgrind-smoke.sh $(objpfx)ld.so $(objpfx)v
>                 '$(run-program-env)' '$(rpath-link)' $(objpfx)valgrind-test \
>                 '$(valgrind-suppressions-tst-valgrind-smoke)' > $@; $(evaluate-test)
>
> +ifeq ($(run-built-tests),yes)
> +tests-special += $(objpfx)tst-rtld-does-not-exist.out
> +endif
> +$(objpfx)tst-rtld-does-not-exist.out: tst-rtld-does-not-exist.sh $(objpfx)ld.so
> +       $(SHELL) $< $(objpfx)ld.so > $@; \
> +       $(evaluate-test)
> +
>  tests += $(tests-execstack-$(have-z-execstack))
>  ifeq ($(run-built-tests),yes)
>  tests-special += \
> diff --git a/elf/tst-rtld-does-not-exist.sh b/elf/tst-rtld-does-not-exist.sh
> new file mode 100644
> index 0000000000..a4a781ccfd
> --- /dev/null
> +++ b/elf/tst-rtld-does-not-exist.sh
> @@ -0,0 +1,39 @@
> +#!/bin/sh
> +# Check that running ld.so with a non-existing file prints an error.
> +# Copyright (C) 2024 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/>.
> +
> +export LC_ALL=C
> +
> +rtld="$1"
> +tmp_out="$(mktemp)"
> +
> +$rtld program-does-not-exist 2>"$tmp_out"
> +status=$?
> +echo "$rtld exit status: $status"
> +echo "output (with expected error):"
> +cat "$tmp_out"
> +
> +if test $status -eq 127 \
> +       && grep -q "^program-does-not-exist: error while loading shared libraries: program-does-not-exist: cannot open shared object file$" "$tmp_out" \
> +       && test "$(wc -l < "$tmp_out")" -eq 1 ; then
> +    status=0
> +else
> +    status=1
> +fi
> +rm "$tmp_out"
> +exit $status
>
> base-commit: f8d8b1b1e6d3b8b93f224efc796b7ea083fdb83f
>

LGTM.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

Thanks.