PING^1 [PATCH] Add and use link-test-modules-rpath-link [BZ #28455]

["H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>]

On Fri, Oct 15, 2021 at 1:07 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> DT_RUNPATH is only used to find the immediate dependencies of the
> executable or shared object containing the DT_RUNPATH entry:
>
> 1. Define link-test-modules-rpath-link if $(build-hardcoded-path-in-tests)
> is yes.
> 2. Use $(link-test-modules-rpath-link) in build-module-helper so that
> test modules can dlopen modules with DT_RUNPATH.
> 3. Add a test to show why link-test-modules-rpath-link is needed.
>
> This partially fixes BZ #28455.
> ---
>  Makeconfig           |  2 ++
>  Makerules            |  1 +
>  elf/Makefile         |  8 +++++++-
>  elf/tst-global2.c    | 28 ++++++++++++++++++++++++++++
>  elf/tst-globalmod2.c | 37 +++++++++++++++++++++++++++++++++++++
>  5 files changed, 75 insertions(+), 1 deletion(-)
>  create mode 100644 elf/tst-global2.c
>  create mode 100644 elf/tst-globalmod2.c
>
> diff --git a/Makeconfig b/Makeconfig
> index 2fa0884b4e..302fbf7e6b 100644
> --- a/Makeconfig
> +++ b/Makeconfig
> @@ -569,8 +569,10 @@ link-libc-rpath-link = -Wl,-rpath-link=$(rpath-link)
>  # build-hardcoded-path-in-tests.
>  ifeq (yes,$(build-hardcoded-path-in-tests))
>  link-libc-tests-rpath-link = $(link-libc-rpath)
> +link-test-modules-rpath-link = $(link-libc-rpath)
>  else
>  link-libc-tests-rpath-link = $(link-libc-rpath-link)
> +link-test-modules-rpath-link =
>  endif  # build-hardcoded-path-in-tests
>
>  link-libc-between-gnulib = $(common-objpfx)libc.so$(libc.so-version) \
> diff --git a/Makerules b/Makerules
> index 596fa68376..ac15671a0a 100644
> --- a/Makerules
> +++ b/Makerules
> @@ -600,6 +600,7 @@ $(LINK.o) -shared -static-libgcc $(sysdep-LDFLAGS) $(rtld-LDFLAGS) \
>           $(if $($(@F)-no-z-defs)$(no-z-defs),,-Wl,-z,defs) \
>           -B$(csu-objpfx) $(load-map-file) \
>           $(LDFLAGS.so) $(LDFLAGS-$(@F:%.so=%).so) \
> +         $(link-test-modules-rpath-link) \
>           -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link)
>  endef
>
> diff --git a/elf/Makefile b/elf/Makefile
> index b01ace2d5a..eeef71b82a 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -224,7 +224,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
>          tst-tls-ie tst-tls-ie-dlmopen argv0test \
>          tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
>          tst-tls20 tst-tls21 tst-dlmopen-dlerror tst-dlmopen-gethostbyname \
> -        tst-dl-is_dso tst-ro-dynamic
> +        tst-dl-is_dso tst-ro-dynamic tst-global2
>  #       reldep9
>  tests-internal += loadtest unload unload2 circleload1 \
>          neededtest neededtest2 neededtest3 neededtest4 \
> @@ -365,6 +365,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
>                 tst-tls20mod-bad tst-tls21mod tst-dlmopen-dlerror-mod \
>                 tst-auxvalmod \
>                 tst-dlmopen-gethostbyname-mod tst-ro-dynamic-mod \
> +               tst-globalmod2 \
>
>  # Most modules build with _ISOMAC defined, but those filtered out
>  # depend on internal headers.
> @@ -1269,6 +1270,11 @@ tst-audit8-ENV = LD_AUDIT=$(objpfx)tst-auditmod1.so
>
>  $(objpfx)tst-global1.out: $(objpfx)testobj6.so $(objpfx)testobj2.so
>
> +$(objpfx)tst-global2: $(objpfx)tst-globalmod2.so
> +$(objpfx)tst-global2.out: $(objpfx)reldepmod1.so $(objpfx)reldepmod4.so
> +LDFLAGS-tst-global2 = -Wl,--enable-new-dtags
> +LDFLAGS-tst-globalmod2.so = -Wl,--enable-new-dtags
> +
>  $(objpfx)order2.out: $(objpfx)order2mod1.so $(objpfx)order2mod2.so
>  $(objpfx)order2-cmp.out: $(objpfx)order2.out
>         (echo "12345" | cmp $< -) > $@; \
> diff --git a/elf/tst-global2.c b/elf/tst-global2.c
> new file mode 100644
> index 0000000000..b17b69c42b
> --- /dev/null
> +++ b/elf/tst-global2.c
> @@ -0,0 +1,28 @@
> +/* Test dlopening a shared library in a shared library built with
> +   -Wl,--enable-new-dtags in glibc with --enable-hardcoded-path-in-tests.
> +   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/>.  */
> +
> +extern int test (void);
> +
> +static int
> +do_test (void)
> +{
> +  return test ();
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/elf/tst-globalmod2.c b/elf/tst-globalmod2.c
> new file mode 100644
> index 0000000000..1d0cf3047e
> --- /dev/null
> +++ b/elf/tst-globalmod2.c
> @@ -0,0 +1,37 @@
> +/* Test dlopening a shared library in a shared library built with
> +   -Wl,--enable-new-dtags in glibc with --enable-hardcoded-path-in-tests.
> +   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 <dlfcn.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +
> +extern int test (void);
> +
> +int
> +test (void)
> +{
> +  (void) dlopen ("reldepmod4.so", RTLD_LAZY | RTLD_GLOBAL);
> +  if (dlsym (RTLD_DEFAULT, "call_me") != NULL)
> +    {
> +      puts ("found \"call_me\"");
> +      return EXIT_SUCCESS;
> +    }
> +  puts ("didn't find \"call_me\"");
> +  return EXIT_FAILURE;
> +}
> --
> 2.31.1
>

PING.

-- 
H.J.