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wordexp: Split out command execution tests from posix/wordexp-test
Once wordexp switches to posix_spawn, testing for command execution based on fork handlers will not work anymore. Therefore, move these subtests into a new test, posix/tst-wordexp-nocmd, which uses a different form of command execution detection, based on PID namespaces. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
parent
ca602c1536
commit
3203690170
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2019-10-08 Florian Weimer <fweimer@redhat.com>
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* posix/Makefile (tests): Add tst-wordexp-nocmd.
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* posix/wordexp-test.c (__app_register_atfork): Remove function.
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(registered_forks): Remove variable.
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(register_fork): Remove function.
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(test_case): Remove WRDE_NOCMD tests.
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(main): Do not set up fork tracking. Remove integer overflow in
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division tests.
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(testit): Do not check for unexpected forks.
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* posix/tst-wordexp-nocmd.c: New file containing the tests removed
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from posix/wordexp-test.c.
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2019-10-07 Florian Weimer <fweimer@redhat.com>
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nptl: Move pthread_attr_setschedparam implementation into libc.
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@ -100,7 +100,8 @@ tests := test-errno tstgetopt testfnm runtests runptests \
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tst-posix_fadvise tst-posix_fadvise64 \
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tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \
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tst-glob-tilde test-ssize-max tst-spawn4 bug-regex37 \
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bug-regex38 tst-regcomp-truncated tst-spawn-chdir
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bug-regex38 tst-regcomp-truncated tst-spawn-chdir \
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tst-wordexp-nocmd
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tests-internal := bug-regex5 bug-regex20 bug-regex33 \
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tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \
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tst-glob_lstat_compat tst-spawn4-compat
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179
posix/tst-wordexp-nocmd.c
Normal file
179
posix/tst-wordexp-nocmd.c
Normal file
@ -0,0 +1,179 @@
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/* Test for (lack of) command execution in wordexp.
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Copyright (C) 1997-2019 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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/* This test optionally counts PIDs in a PID namespace to detect
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forks. Without kernel support for that, it will merely look at the
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error codes from wordexp to check that no command execution
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happens. */
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#include <sched.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/xunistd.h>
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#include <wordexp.h>
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/* Set to true if the test runs in a PID namespace and can therefore
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use next_pid below. */
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static bool pid_tests_supported;
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/* The next PID, as returned from next_pid below. Only meaningful if
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pid_tests_supported. */
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static pid_t expected_pid;
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/* Allocate the next PID and return it. The process is terminated.
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Note that the test itself advances the next PID. */
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static pid_t
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next_pid (void)
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{
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pid_t pid = xfork ();
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if (pid == 0)
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_exit (0);
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xwaitpid (pid, NULL, 0);
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return pid;
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}
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/* Check that evaluating PATTERN with WRDE_NOCMD results in
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EXPECTED_ERROR. */
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static void
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expect_failure (const char *pattern, int expected_error)
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{
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printf ("info: testing pattern: %s\n", pattern);
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wordexp_t w;
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TEST_COMPARE (wordexp (pattern, &w, WRDE_NOCMD), expected_error);
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if (pid_tests_supported)
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TEST_COMPARE (expected_pid++, next_pid ());
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}
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/* Run all the tests. Invoked with different IFS values. */
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static void
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run_tests (void)
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{
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/* Integer overflow in division. */
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{
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static const char *const numbers[] = {
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"0",
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"1",
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"65536",
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"2147483648",
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"4294967296"
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"9223372036854775808",
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"18446744073709551616",
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"170141183460469231731687303715884105728",
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"340282366920938463463374607431768211456",
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NULL
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};
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for (const char *const *num = numbers; *num != NULL; ++num)
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{
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wordexp_t w;
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char pattern[256];
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snprintf (pattern, sizeof (pattern), "$[(-%s)/(-1)]", *num);
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int ret = wordexp (pattern, &w, WRDE_NOCMD);
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if (ret == 0)
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{
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/* If the call is successful, the result must match the
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original number. */
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TEST_COMPARE (w.we_wordc, 1);
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TEST_COMPARE_STRING (w.we_wordv[0], *num);
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TEST_COMPARE_STRING (w.we_wordv[1], NULL);
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wordfree (&w);
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}
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else
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/* Otherwise, the test must fail with a syntax error. */
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TEST_COMPARE (ret, WRDE_SYNTAX);
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/* In both cases, command execution is not permitted. */
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if (pid_tests_supported)
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TEST_COMPARE (expected_pid++, next_pid ());
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}
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}
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/* (Lack of) command execution tests. */
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expect_failure ("$(ls)", WRDE_CMDSUB);
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/* Test for CVE-2014-7817. We test 3 combinations of command
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substitution inside an arithmetic expression to make sure that
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no commands are executed and error is returned. */
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expect_failure ("$((`echo 1`))", WRDE_CMDSUB);
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expect_failure ("$((1+`echo 1`))", WRDE_CMDSUB);
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expect_failure ("$((1+$((`echo 1`))))", WRDE_CMDSUB);
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expect_failure ("$[1/0]", WRDE_SYNTAX); /* BZ 18100. */
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}
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static void
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subprocess (void *closure)
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{
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expected_pid = 2;
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if (pid_tests_supported)
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TEST_COMPARE (expected_pid++, next_pid ());
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/* Check that triggering command execution via wordexp results in a
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PID increase. */
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if (pid_tests_supported)
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{
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wordexp_t w;
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TEST_COMPARE (wordexp ("$(echo Test)", &w, 0), 0);
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TEST_COMPARE (w.we_wordc, 1);
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TEST_COMPARE_STRING (w.we_wordv[0], "Test");
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TEST_COMPARE_STRING (w.we_wordv[1], NULL);
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wordfree (&w);
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pid_t n = next_pid ();
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printf ("info: self-test resulted in PID %d (processes created: %d)\n",
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(int) n, (int) (n - expected_pid));
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TEST_VERIFY (n > expected_pid);
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expected_pid = n + 1;
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}
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puts ("info: testing without IFS");
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unsetenv ("IFS");
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run_tests ();
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puts ("info: testing with IFS");
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TEST_COMPARE (setenv ("IFS", " \t\n", 1), 0);
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run_tests ();
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}
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static int
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do_test (void)
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{
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support_become_root ();
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#ifdef CLONE_NEWPID
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if (unshare (CLONE_NEWPID) != 0)
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printf ("warning: unshare (CLONE_NEW_PID) failed: %m\n"
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"warning: This leads to reduced test coverage.\n");
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else
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pid_tests_supported = true;
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#else
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printf ("warning: CLONE_NEW_PID not available.\n"
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"warning: This leads to reduced test coverage.\n");
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#endif
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/* CLONE_NEWPID only has an effect after fork. */
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support_isolate_in_subprocess (subprocess, NULL);
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return 0;
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}
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#include <support/test-driver.c>
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@ -31,23 +31,6 @@
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#define IFS " \n\t"
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extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
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static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void))
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{
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return __register_atfork (prepare, parent, child, __dso_handle);
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}
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/* Number of forks seen. */
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static int registered_forks;
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/* For each fork increment the fork count. */
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static void
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register_fork (void)
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{
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registered_forks++;
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}
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struct test_case_struct
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{
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int retval;
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@ -217,7 +200,6 @@ struct test_case_struct
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{ WRDE_BADCHAR, NULL, "close-paren)", 0, 0, { NULL, }, IFS },
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{ WRDE_BADCHAR, NULL, "{open-brace", 0, 0, { NULL, }, IFS },
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{ WRDE_BADCHAR, NULL, "close-brace}", 0, 0, { NULL, }, IFS },
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{ WRDE_CMDSUB, NULL, "$(ls)", WRDE_NOCMD, 0, { NULL, }, IFS },
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{ WRDE_BADVAL, NULL, "$var", WRDE_UNDEF, 0, { NULL, }, IFS },
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{ WRDE_BADVAL, NULL, "$9", WRDE_UNDEF, 0, { NULL, }, IFS },
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{ WRDE_SYNTAX, NULL, "$[50+20))", 0, 0, { NULL, }, IFS },
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@ -227,17 +209,10 @@ struct test_case_struct
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{ WRDE_SYNTAX, NULL, "$((2+))", 0, 0, { NULL, }, IFS },
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{ WRDE_SYNTAX, NULL, "`", 0, 0, { NULL, }, IFS },
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{ WRDE_SYNTAX, NULL, "$((010+4+))", 0, 0, { NULL }, IFS },
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/* Test for CVE-2014-7817. We test 3 combinations of command
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substitution inside an arithmetic expression to make sure that
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no commands are executed and error is returned. */
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{ WRDE_CMDSUB, NULL, "$((`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
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{ WRDE_CMDSUB, NULL, "$((1+`echo 1`))", WRDE_NOCMD, 0, { NULL, }, IFS },
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{ WRDE_CMDSUB, NULL, "$((1+$((`echo 1`))))", WRDE_NOCMD, 0, { NULL, }, IFS },
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{ WRDE_SYNTAX, NULL, "`\\", 0, 0, { NULL, }, IFS }, /* BZ 18042 */
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{ WRDE_SYNTAX, NULL, "${", 0, 0, { NULL, }, IFS }, /* BZ 18043 */
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{ WRDE_SYNTAX, NULL, "L${a:", 0, 0, { NULL, }, IFS }, /* BZ 18043#c4 */
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{ WRDE_SYNTAX, NULL, "$[1/0]", WRDE_NOCMD, 0, {NULL, }, IFS }, /* BZ 18100 */
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{ -1, NULL, NULL, 0, 0, { NULL, }, IFS },
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};
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@ -290,15 +265,6 @@ main (int argc, char *argv[])
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return -1;
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}
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/* If we are not allowed to do command substitution, we install
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fork handlers to verify that no forks happened. No forks should
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happen at all if command substitution is disabled. */
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if (__app_register_atfork (register_fork, NULL, NULL) != 0)
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{
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printf ("Failed to register fork handler.\n");
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return -1;
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}
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for (test = 0; test_case[test].retval != -1; test++)
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if (testit (&test_case[test]))
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++fail;
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@ -363,45 +329,6 @@ main (int argc, char *argv[])
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++fail;
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}
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/* Integer overflow in division. */
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{
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static const char *const numbers[] = {
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"0",
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"1",
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"65536",
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"2147483648",
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"4294967296"
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"9223372036854775808",
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"18446744073709551616",
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"170141183460469231731687303715884105728",
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"340282366920938463463374607431768211456",
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NULL
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};
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for (const char *const *num = numbers; *num; ++num)
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{
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wordexp_t p;
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char pattern[256];
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snprintf (pattern, sizeof (pattern), "$[(-%s)/(-1)]", *num);
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int ret = wordexp (pattern, &p, WRDE_NOCMD);
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if (ret == 0)
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{
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if (p.we_wordc != 1 || strcmp (p.we_wordv[0], *num) != 0)
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{
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printf ("Integer overflow for \"%s\" failed", pattern);
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++fail;
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}
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wordfree (&p);
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}
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else if (ret != WRDE_SYNTAX)
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{
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printf ("Integer overflow for \"%s\" failed with %d",
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pattern, ret);
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++fail;
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}
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}
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}
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puts ("tests completed, now cleaning up");
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/* Clean up */
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@ -472,9 +399,6 @@ testit (struct test_case_struct *tc)
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fflush (NULL);
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const char *words = at_page_end (tc->words);
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if (tc->flags & WRDE_NOCMD)
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registered_forks = 0;
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if (tc->flags & WRDE_APPEND)
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{
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/* initial wordexp() call, to be appended to */
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@ -486,13 +410,6 @@ testit (struct test_case_struct *tc)
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}
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retval = wordexp (words, &we, tc->flags);
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if ((tc->flags & WRDE_NOCMD)
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&& (registered_forks > 0))
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{
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printf ("FAILED fork called for WRDE_NOCMD\n");
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return 1;
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}
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if (tc->flags & WRDE_DOOFFS)
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start_offs = sav_we.we_offs;
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