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41389c4049
The condition when the value of an envvar is empty (not just '\0'), the loop in tunables_init gets stuck infinitely because envp is not incremented. Fix that by always incrementing envp in the loop. Added test case (tst-empty-env.c) verifies the fix when the source is configured with --enable-hardcoded-path-in-tests, thanks Josh Stone for providing the test case. Verified on x86_64. * elf/dl-tunables (get_next_env): Always advance envp. * stdlib/tst-empty-env.c: New test case. * stdlib/Makefile (tests): Use it.
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Test that passing a NULL value does not hang environment traversal in
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tunables.
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Copyright (C) 2017 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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<http://www.gnu.org/licenses/>. */
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/* The test is useful only when the source is configured with
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--enable-hardcoded-path-in-tests since otherwise the execve just picks up
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the system dynamic linker. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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static int
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do_test (int argc, char **argv)
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{
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if (argc == 2)
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return 0;
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char envname[] = "FOOBAR";
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char *filename = program_invocation_name;
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char *newargv[] = {filename, filename, NULL};
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char *newenviron[] = {envname, NULL};
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/* This was reported in Fedora:
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https://bugzilla.redhat.com/show_bug.cgi?id=1414589
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If one of the environment variables has no value, then the environment
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traversal must skip and also advance to the next environment entry. The
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bug in question would cause this test to hang in an infinite loop. */
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int ret = execve (filename, newargv, newenviron);
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if (ret != 0)
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printf ("execve failed: %m");
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/* We will reach here only if we fail execve. */
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return 1;
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}
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#define TIMEOUT 3
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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