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
9ff72da471a509a8c19791efe469f47fa6977410 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
+2018-06-08 Adhemerval Zanella <adhemerval.zanella@linaro.org>
+
+ [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.
+
2018-06-08 H.J. Lu <hongjiu.lu@intel.com>
[BZ #23145]
extern int __rmdir (const char *__path) attribute_hidden;
extern int __execvpe (const char *file, char *const argv[],
char *const envp[]) attribute_hidden;
+extern int __execvpex (const char *file, char *const argv[],
+ char *const envp[]) attribute_hidden;
/* Get the canonical absolute name of the named directory, and put it in SIZE
bytes of BUF. Returns NULL if the directory couldn't be determined or
tst-posix_spawn-fd tst-posix_spawn-setsid \
tst-posix_fadvise tst-posix_fadvise64 \
tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \
- tst-glob-tilde test-ssize-max
+ tst-glob-tilde test-ssize-max tst-spawn4
tests-internal := bug-regex5 bug-regex20 bug-regex33 \
tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \
- tst-glob_lstat_compat
+ tst-glob_lstat_compat tst-spawn4-compat
xtests := bug-ga2 tst-getaddrinfo4 tst-getaddrinfo5
ifeq (yes,$(build-shared))
test-srcs := globtest
__execve (new_argv[0], new_argv, envp);
}
-
-/* Execute FILE, searching in the `PATH' environment variable if it contains
- no slashes, with arguments ARGV and environment from ENVP. */
-int
-__execvpe (const char *file, char *const argv[], char *const envp[])
+static int
+__execvpe_common (const char *file, char *const argv[], char *const envp[],
+ bool exec_script)
{
/* We check the simple case first. */
if (*file == '\0')
{
__execve (file, argv, envp);
- if (errno == ENOEXEC)
+ if (errno == ENOEXEC && exec_script)
maybe_script_execute (file, argv, envp);
return -1;
__execve (buffer, argv, envp);
- if (errno == ENOEXEC)
+ if (errno == ENOEXEC && exec_script)
/* This has O(P*C) behavior, where P is the length of the path and C
is the argument count. A better strategy would be allocate the
substitute argv and reuse it each time through the loop (so it
return -1;
}
+/* Execute FILE, searching in the `PATH' environment variable if it contains
+ no slashes, with arguments ARGV and environment from ENVP. */
+int
+__execvpe (const char *file, char *const argv[], char *const envp[])
+{
+ return __execvpe_common (file, argv, envp, true);
+}
weak_alias (__execvpe, execvpe)
+
+/* Same as __EXECVPE, but does not try to execute NOEXEC files. */
+int
+__execvpex (const char *file, char *const argv[], char *const envp[])
+{
+ return __execvpe_common (file, argv, envp, false);
+}
--- /dev/null
+/* Check if posix_spawn does handle correctly ENOEXEC files.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <spawn.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <support/xunistd.h>
+#include <support/check.h>
+#include <support/temp_file.h>
+
+#include <shlib-compat.h>
+#if TEST_COMPAT (libc, GLIBC_2_0, GLIBC_2_15)
+
+compat_symbol_reference (libc, posix_spawn, posix_spawn, GLIBC_2_2);
+compat_symbol_reference (libc, posix_spawnp, posix_spawnp, GLIBC_2_2);
+
+static int
+do_test (void)
+{
+ char *scriptname;
+ int fd = create_temp_file ("tst-spawn4.", &scriptname);
+ TEST_VERIFY_EXIT (fd >= 0);
+
+ const char script[] = "exit 65";
+ xwrite (fd, script, sizeof (script) - 1);
+ xclose (fd);
+
+ TEST_VERIFY_EXIT (chmod (scriptname, 0x775) == 0);
+
+ pid_t pid;
+ int status;
+
+ /* For compat symbol it verifies that trying to issued a shell script
+ without a shebang is correctly executed. */
+ status = posix_spawn (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
+ (char *[]) { 0 });
+ TEST_VERIFY_EXIT (status == 0);
+
+ TEST_VERIFY_EXIT (waitpid (pid, &status, 0) == pid);
+ TEST_VERIFY_EXIT (WIFEXITED (status) == 1 && WEXITSTATUS (status) == 65);
+
+ status = posix_spawnp (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
+ (char *[]) { 0 });
+ TEST_VERIFY_EXIT (status == 0);
+
+ TEST_VERIFY_EXIT (waitpid (pid, &status, 0) == pid);
+ TEST_VERIFY_EXIT (WIFEXITED (status) == 1 && WEXITSTATUS (status) == 65);
+
+ return 0;
+}
+#else
+static int
+do_test (void)
+{
+ return 77;
+}
+#endif
+
+#include <support/test-driver.c>
--- /dev/null
+/* Check if posix_spawn does handle correctly ENOEXEC files.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <spawn.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <support/xunistd.h>
+#include <support/check.h>
+#include <support/temp_file.h>
+
+static int
+do_test (void)
+{
+ char *scriptname;
+ int fd = create_temp_file ("tst-spawn4.", &scriptname);
+ TEST_VERIFY_EXIT (fd >= 0);
+
+ const char script[] = "echo it should not happen";
+ xwrite (fd, script, sizeof (script) - 1);
+ xclose (fd);
+
+ TEST_VERIFY_EXIT (chmod (scriptname, 0x775) == 0);
+
+ pid_t pid;
+ int status;
+
+ /* Check if scripts without shebang are correctly not executed. */
+ status = posix_spawn (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
+ (char *[]) { 0 });
+ TEST_VERIFY_EXIT (status == ENOEXEC);
+
+ status = posix_spawnp (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
+ (char *[]) { 0 });
+ TEST_VERIFY_EXIT (status == ENOEXEC);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
const posix_spawnattr_t * attrp, char *const argv[],
char *const envp[], int xflags)
{
+ /* It uses __execvpex to avoid run ENOEXEC in non compatibility mode (it
+ will be handled by maybe_script_execute). */
return __spawnix (pid, file, acts, attrp, argv, envp, xflags,
- xflags & SPAWN_XFLAGS_USE_PATH ? __execvpe : __execve);
+ xflags & SPAWN_XFLAGS_USE_PATH ? __execvpex : __execve);
}
const posix_spawnattr_t * attrp, char *const argv[],
char *const envp[], int xflags)
{
+ /* It uses __execvpex to avoid run ENOEXEC in non compatibility mode (it
+ will be handled by maybe_script_execute). */
return __spawnix (pid, file, acts, attrp, argv, envp, xflags,
- xflags & SPAWN_XFLAGS_USE_PATH ? __execvpe : __execve);
+ xflags & SPAWN_XFLAGS_USE_PATH ? __execvpex :__execve);
}
projects / thirdparty / glibc.git / commitdiff
