posix: Use posix_spawn for wordexp

This patch replaces the fork+exec by posix_spawn on wordexp, which
allows a better scability on Linux and simplifies the thread
cancellation handling.

The only change which can not be implemented with posix_spawn the
/dev/null check to certify it is indeed the expected device.  I am
not sure how effetive this check is since /dev/null tampering means
something very wrong with the system and this is the least of the
issues.  My view is the tests is really out of the place and the
hardening provided is minimum.

If the idea is still to provide such check, I think a possibilty
would be to open /dev/null, check it, add a dup2 file action, and
close the file descriptor.

Checked on powerpc64le-linux-gnu and x86_64-linux-gnu.

	* include/spawn.h (__posix_spawn_file_actions_addopen): New
	prototype.
	* posix/spawn_faction_addopen.c (posix_spawn_file_actions_addopen):
	Add internal alias.
	* posix/wordexp.c (create_environment, free_environment): New
	functions.
	(exec_comm_child, exec_comm): Use posix_spawn instead of fork+exec.
	* posix/wordexp-test.c: Use libsupport.

1 files changed, 9 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 1d4f418e17..2e34b2da34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2019-10-09  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* include/spawn.h (__posix_spawn_file_actions_addopen): New
+	prototype.
+	* posix/spawn_faction_addopen.c (posix_spawn_file_actions_addopen):
+	Add internal alias.
+	* posix/wordexp.c (create_environment, free_environment): New
+	functions.
+	(exec_comm_child, exec_comm): Use posix_spawn instead of fork+exec.
+	* posix/wordexp-test.c: Use libsupport.
+
 	* sysdeps/unix/sysv/linux/mips/mips64/getdents64.c (__getdents64):
 	Add small optimization for older kernel to avoid issuing
 	__NR_getdents64 on each call and replace scratch_buffer usage with