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When the first object providing foo defines both foo@v1 and foo@@v2, dlsym(RTLD_NEXT, "foo") returns foo@v1 while dlsym(RTLD_DEFAULT, "foo") returns foo@@v2. The issue is that RTLD_DEFAULT uses the DL_LOOKUP_RETURN_NEWEST flag while RTLD_NEXT doesn't. Fix the RTLD_NEXT branch to use DL_LOOKUP_RETURN_NEWEST. Note: the new behavior matches FreeBSD rtld. Future sanitizers will not need to add versioned interceptors like https://reviews.llvm.org/D96348 Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/* Test RTLD_DEFAULT/RTLD_NEXT when the definition has multiple versions.
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <stdio.h>
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#include "testobj.h"
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static int
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do_test (void)
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{
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/* Resolve to foo@@v3 in nextmod3.so, instead of
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foo@v1 or foo@v2. */
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int (*fp) (int) = dlsym (RTLD_DEFAULT, "foo");
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int res = fp (0);
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printf ("preload (0) = %d, %s\n", res, res == 3 ? "ok" : "wrong");
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if (res != 3)
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return 1;
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/* Resolve to foo@@v3 in nextmod3.so, instead of
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foo@v1 or foo@v2. */
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fp = dlsym (RTLD_NEXT, "foo");
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res = fp (0);
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printf ("preload (0) = %d, %s\n", res, res == 3 ? "ok" : "wrong");
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if (res != 3)
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return 1;
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return 0;
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}
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#include <support/test-driver.c>
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