283d985122
Current posix_spawnp implementation wrongly tries to execute invalid
binaries (for instance script without shebang) as a shell script in
non compat mode. It was a regression introduced by
9ff72da471 when __spawni started to use
__execvpe instead of __execve (glibc __execvpe try to execute ENOEXEC
as shell script regardless).
This patch fixes it by using an internal symbol (__execvpex) with the
faulty semantic (since compat mode is handled by spawni.c itself).
It was reported by Daniel Drake on libc-help [1].
Checked on x86_64-linux-gnu and i686-linux-gnu.
[BZ #23264]
* include/unistd.h (__execvpex): New prototype.
* posix/Makefile (tests): Add tst-spawn4.
(tests-internal): Add tst-spawn4-compat.
* posix/execvpe.c (__execvpe_common, __execvpex): New functions.
* posix/tst-spawn4-compat.c: New file.
* posix/tst-spawn4.c: Likewise.
* sysdeps/unix/sysv/linux/spawni.c (__spawni): Do not interpret invalid
binaries as shell scripts.
* sysdeps/posix/spawni.c (__spawni): Likewise.
[1] https://sourceware.org/ml/libc-help/2018-06/msg00012.html
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Check if posix_spawn does handle correctly ENOEXEC files.
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Copyright (C) 2018 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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#include <spawn.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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static int
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do_test (void)
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{
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char *scriptname;
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int fd = create_temp_file ("tst-spawn4.", &scriptname);
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TEST_VERIFY_EXIT (fd >= 0);
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const char script[] = "echo it should not happen";
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xwrite (fd, script, sizeof (script) - 1);
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xclose (fd);
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TEST_VERIFY_EXIT (chmod (scriptname, 0x775) == 0);
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pid_t pid;
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int status;
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/* Check if scripts without shebang are correctly not executed. */
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status = posix_spawn (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
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(char *[]) { 0 });
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TEST_VERIFY_EXIT (status == ENOEXEC);
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status = posix_spawnp (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
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(char *[]) { 0 });
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TEST_VERIFY_EXIT (status == ENOEXEC);
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return 0;
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}
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#include <support/test-driver.c>
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