Fix test-errno issues

This patch fixes multiple issues of test-errno.c (9a56f8718341):

  - Rename Linux test-errno.c to test-errno-linux.c to avoid build
    the same source for both tests.

  - Add a mlock check for 32 bits build running on 64 bits kernels.
    Althuough man pages states that mlock fails with EINVAL if final
    address overflows, kernels does not return it for aforementioned
    condition (it returns ENOMEM instead).  Although it seems to be
    a kernel issue for compat syscall handling, I think it is worth
    to still check syscall return and document the behavior.

  - Initialize option lenght for setsockopt check.

  - Change open test from EINVAL to EISDIR.

Checked on x86_64-linux-gnu and i686-linux-gnu (running on 64 bits
kernel).

	* posix/test-errno.c (do_test): Initialize setsockopt optlen.
	* sysdeps/unix/sysv/linux/test-errno.c: Move to ...
	* sysdeps/unix/sysv/linux/test-errno-linux.c: ... here.
	(test_wrp_rv): Fix format.
	(test_wrp_rv2): New macro.
	(do_test): Handle mlock return on 64 bits kernels with 32 bits
	binaries.

1 files changed, 176 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/test-errno-linux.c b/sysdeps/unix/sysv/linux/test-errno-linux.c
new file mode 100644
index 0000000..03a74bd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/test-errno-linux.c
@@ -0,0 +1,176 @@
+/* Test that failing system calls do set errno to the correct value.
+   Linux sycalls version.
+
+   Copyright (C) 2017 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 <errno.h>
+#include <fcntl.h>
+#include <mqueue.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <sys/file.h>
+#include <sys/fsuid.h>
+#include <sys/inotify.h>
+#include <sys/mman.h>
+#include <sys/poll.h>
+#include <sys/quota.h>
+#include <sys/resource.h>
+#include <sys/select.h>
+#include <sys/sendfile.h>
+#include <sys/swap.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+/* This is not an exhaustive test: only system calls that can be
+   persuaded to fail with a consistent error code and no side effects
+   are included.  Usually these are failures due to invalid arguments,
+   with errno code EBADF or EINVAL.  The order of argument checks is
+   unspecified, so we must take care to provide arguments that only
+   allow _one_ failure mode.
+
+   Note that all system calls that can fail with EFAULT are permitted
+   to deliver a SIGSEGV signal instead, so we avoid supplying invalid
+   pointers in general, and we do not attempt to test system calls
+   that can only fail with EFAULT (e.g. gettimeofday, gethostname).
+
+   Also note that root-only system calls (e.g. acct, reboot) may, when
+   the test is run as an unprivileged user, fail due to insufficient
+   privileges before bothering to do argument checks, so those are not
+   tested either.
+
+   Also, system calls that take enum or a set of flags as argument is
+   not tested if POSIX doesn't specify exact binary values for all
+   flags, and so any value passed to flags may become valid.
+
+   Some tests assume "/bin/sh" names a file that exists and is not a
+   directory.  */
+
+#define test_wrp_rv(rtype, prtype, experr, syscall, ...)	\
+  (__extension__ ({						\
+    errno = 0xdead;						\
+    rtype ret = syscall (__VA_ARGS__);				\
+    int err = errno;						\
+    int fail;							\
+    if ((ret == (rtype) -1) && (err == experr))			\
+      fail = 0;							\
+    else							\
+      {								\
+        fail = 1;						\
+        if (ret != (rtype) -1)					\
+          printf ("FAIL: " #syscall ": didn't fail as expected"	\
+		  " (return "prtype")\n", ret);			\
+        else if (err == 0xdead)					\
+          puts ("FAIL: " #syscall ": didn't update errno");	\
+        else if (err != experr)					\
+          printf ("FAIL: " #syscall				\
+		  ": errno is: %d (%s) expected: %d (%s)\n",	\
+		  err, strerror (err), experr, strerror (experr));\
+      }								\
+    fail;							\
+  }))
+
+#define test_wrp_rv2(rtype, prtype, experr1, experr2, syscall, ...) 	\
+  (__extension__ ({							\
+    errno = 0xdead;							\
+    rtype ret = syscall (__VA_ARGS__);					\
+    int err = errno;							\
+    int fail;								\
+    if ((ret == (rtype) -1) && ((err == experr1) || (err == experr2)))	\
+      fail = 0;								\
+    else								\
+      {									\
+        fail = 1;							\
+        if (ret != (rtype) -1)						\
+          printf ("FAIL: " #syscall ": didn't fail as expected"		\
+		  " (return "prtype")\n", ret);				\
+        else if (err == 0xdead)						\
+          puts ("FAIL: " #syscall ": didn't update errno");		\
+        else if (err != experr1 && err != experr2)			\
+          printf ("FAIL: " #syscall					\
+		  ": errno is: %d (%s) expected: %d (%s) or %d (%s)\n",	\
+		  err, strerror (err), experr1, strerror (experr1),	\
+		  experr2, strerror (experr2));				\
+      }									\
+    fail;								\
+  }))
+
+#define test_wrp(experr, syscall, ...)				\
+  test_wrp_rv(int, "%d", experr, syscall, __VA_ARGS__)
+
+#define test_wrp2(experr1, experr2, syscall, ...)		\
+  test_wrp_rv2(int, "%d", experr1, experr2, syscall, __VA_ARGS__)
+
+static int
+do_test (void)
+{
+  fd_set rs, ws, es;
+  int status;
+  off_t off;
+  stack_t ss;
+  struct dqblk dqblk;
+  struct epoll_event epoll_event;
+  struct pollfd pollfd;
+  struct sched_param sch_param;
+  struct timespec ts;
+  struct timeval tv;
+  unsigned char vec[16];
+  ss.ss_flags = ~SS_DISABLE;
+  ts.tv_sec = -1;
+
+  int fails = 0;
+  fails |= test_wrp (EINVAL, epoll_create, -1);
+  fails |= test_wrp (EINVAL, epoll_create1, EPOLL_CLOEXEC + 1);
+  fails |= test_wrp (EBADF, epoll_ctl, -1, EPOLL_CTL_ADD, 0, &epoll_event);
+  fails |= test_wrp (EBADF, epoll_wait, -1, &epoll_event, 1, 1);
+  fails |= test_wrp (EBADF, fdatasync, -1);
+  fails |= test_wrp (EBADF, flock, -1, LOCK_SH);
+  fails |= test_wrp (ESRCH, getpgid, -1);
+  fails |= test_wrp (EINVAL, inotify_add_watch, -1, "/", 0);
+  fails |= test_wrp (EINVAL, mincore, (void *) -1, 0, vec);
+  /* mlock fails if the result of the addition addr+len was less than addr
+     (which indicates final address overflow), however on 32 bits binaries
+     running on 64 bits kernels, internal syscall address check won't result
+     in an invalid address and thus syscalls fails later in vma
+     allocation.  */
+  fails |= test_wrp2 (EINVAL, ENOMEM, mlock, (void *) -1, 1);
+  fails |= test_wrp (EINVAL, nanosleep, &ts, &ts);
+  fails |= test_wrp (EINVAL, poll, &pollfd, -1, 0);
+  fails |= test_wrp (ENODEV, quotactl, Q_GETINFO, NULL, -1, (caddr_t) &dqblk);
+  fails |= test_wrp (EINVAL, sched_getparam, -1, &sch_param);
+  fails |= test_wrp (EINVAL, sched_getscheduler, -1);
+  fails |= test_wrp (EINVAL, sched_get_priority_max, -1);
+  fails |= test_wrp (EINVAL, sched_get_priority_min, -1);
+  fails |= test_wrp (EINVAL, sched_rr_get_interval, -1, &ts);
+  fails |= test_wrp (EINVAL, sched_setparam, -1, &sch_param);
+  fails |= test_wrp (EINVAL, sched_setscheduler, -1, 0, &sch_param);
+  fails |= test_wrp (EINVAL, select, -1, &rs, &ws, &es, &tv);
+  fails |= test_wrp (EBADF, sendfile, -1, -1, &off, 0);
+  fails |= test_wrp (EINVAL, sigaltstack, &ss, NULL);
+  fails |= test_wrp (ECHILD, wait4, -1, &status, 0, NULL);
+
+  return fails;
+}
+
+#include "support/test-driver.c"