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123bd1ec66
dlopen may clobber errno. The nss_test_errno module uses an ELF
constructor to achieve that, but there could be internal errors
during dlopen that cause this, too. Therefore, the NSS framework
has to guard against such errno clobbers.
__nss_module_get_function is currently the only function that calls
__nss_module_load, so it is sufficient to save and restore errno
around this call.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 9bdf92c79d)
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* getpwent failure when dlopen clobbers errno (bug 28953).
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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 <nss.h>
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#include <support/check.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <pwd.h>
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#include <string.h>
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static int
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do_test (void)
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{
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__nss_configure_lookup ("passwd", "files test_errno");
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errno = 0;
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setpwent ();
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TEST_COMPARE (errno, 0);
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bool root_seen = false;
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while (true)
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{
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errno = 0;
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struct passwd *e = getpwent ();
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if (e == NULL)
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break;
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if (strcmp (e->pw_name, "root"))
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root_seen = true;
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}
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TEST_COMPARE (errno, 0);
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TEST_VERIFY (root_seen);
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errno = 0;
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endpwent ();
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TEST_COMPARE (errno, 0);
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TEST_COMPARE_STRING (getenv ("_nss_test_errno_setpwent"), "yes");
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TEST_COMPARE_STRING (getenv ("_nss_test_errno_getpwent_r"), "yes");
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TEST_COMPARE_STRING (getenv ("_nss_test_errno_endpwent"), "yes");
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return 0;
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}
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#include <support/test-driver.c>
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