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536ddc5c02
libc_map is never reset to NULL, neither during dlclose nor on a
dlopen call which reuses the namespace structure. As a result, if a
namespace is reused, its libc is not initialized properly. The most
visible result is a crash in the <ctype.h> functions.
To prevent similar bugs on namespace reuse from surfacing,
unconditionally initialize the chosen namespace to zero using memset.
(cherry picked from commit d0e357ff45)
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528). Module 2.
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Copyright (C) 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 <ctype.h>
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#include <stdio.h>
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static void __attribute__ ((constructor))
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init (void)
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{
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puts ("info: tst-dlmopen-twice-mod2.so loaded");
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fflush (stdout);
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}
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static void __attribute__ ((destructor))
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fini (void)
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{
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puts ("info: tst-dlmopen-twice-mod2.so about to be unloaded");
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fflush (stdout);
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}
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int
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run_check (void)
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{
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puts ("info: about to call isalpha");
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fflush (stdout);
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volatile char ch = 'a';
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if (!isalpha (ch))
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{
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puts ("error: isalpha ('a') is not true");
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fflush (stdout);
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return 1;
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}
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return 0;
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}
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