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elf: Use _dl_catch_error from base namespace in dl-libc.c [BZ #27646]

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dlerrror_run in elf/dl-libc.c needs to call GLRO (dl_catch_error)
from the base namespace, just like the exported dlerror
implementation.

Fixes commit b2964eb1d9 ("dlfcn:
Failures after dlmopen should not terminate process [BZ #24772]").

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer 2021-06-17 15:06:43 +02:00
parent 6b229222fc
commit c2059edce2
4 changed files with 66 additions and 3 deletions
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5
elf/Makefile
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@ -223,7 +223,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
tst-single_threaded tst-single_threaded-pthread \
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-tls20 tst-tls21 tst-dlmopen-dlerror tst-dlmopen-gethostbyname
# reldep9
tests-internal += loadtest unload unload2 circleload1 \
neededtest neededtest2 neededtest3 neededtest4 \
@ -347,6 +347,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
libmarkermod4-1 libmarkermod4-2 libmarkermod4-3 libmarkermod4-4 \
tst-tls20mod-bad tst-tls21mod tst-dlmopen-dlerror-mod \
tst-auxvalmod \
tst-dlmopen-gethostbyname-mod \
# Most modules build with _ISOMAC defined, but those filtered out
# depend on internal headers.
@ -1832,3 +1833,5 @@ $(objpfx)tst-tls21mod.so: $(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
$(objpfx)tst-getauxval-static.out: $(objpfx)tst-auxvalmod.so
tst-getauxval-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)
$(objpfx)tst-dlmopen-gethostbyname.out: $(objpfx)tst-dlmopen-gethostbyname-mod.so

2
elf/dl-libc.c
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@ -43,7 +43,7 @@ dlerror_run (void (*operate) (void *), void *args)
const char *last_errstring = NULL;
bool malloced;
int result = (_dl_catch_error (&objname, &last_errstring, &malloced,
int result = (GLRO (dl_catch_error) (&objname, &last_errstring, &malloced,
operate, args)
?: last_errstring != NULL);

29
elf/tst-dlmopen-gethostbyname-mod.c Normal file
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@ -0,0 +1,29 @@
/* Exercise dlerror_run in elf/dl-libc.c after dlmopen, via NSS. Helper module.
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 <netdb.h>
#include <nss.h>
void
call_gethostbyname (void)
{
__nss_configure_lookup ("hosts", "files");
/* This should not terminate the process due to a missing
_nss_files_getcanonname_r symbol. */
gethostbyname ("localhost");
}

31
elf/tst-dlmopen-gethostbyname.c Normal file
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@ -0,0 +1,31 @@
/* Exercise dlerror_run in elf/dl-libc.c after dlmopen, via NSS (bug 27646).
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 <support/xdlfcn.h>
static int
do_test (void)
{
void *handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-gethostbyname-mod.so",
RTLD_NOW);
void (*call_gethostbyname) (void) = xdlsym (handle, "call_gethostbyname");
call_gethostbyname ();
return 0;
}
#include <support/test-driver.c>