New upstream version 1.3upstream/1.3upstream

1 files changed, 267 insertions, 0 deletions

diff --git a/tests/test-getcwd.c b/tests/test-getcwd.c
new file mode 100644
index 00000000..e9d89340
--- /dev/null
+++ b/tests/test-getcwd.c
@@ -0,0 +1,267 @@
+/* Test of getcwd() function.
+   Copyright (C) 2009-2024 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "pathmax.h"
+#include "qemu.h"
+#include "macros.h"
+
+/* This size is chosen to be larger than PATH_MAX (4k), yet smaller than
+   the 16kB pagesize on ia64 linux.  Those conditions make the code below
+   trigger a bug in glibc's getcwd implementation before 2.4.90-10.  */
+#define TARGET_LEN (5 * 1024)
+
+#if defined HAVE_OPENAT || (defined GNULIB_OPENAT && defined HAVE_FDOPENDIR)
+# define HAVE_OPENAT_SUPPORT 1
+#else
+# define HAVE_OPENAT_SUPPORT 0
+#endif
+
+/* Keep this test in sync with m4/getcwd-abort-bug.m4.  */
+static int
+test_abort_bug (void)
+{
+  char *cwd;
+  size_t initial_cwd_len;
+  int fail = 0;
+
+  /* The bug is triggered when PATH_MAX < page size, so skip
+     this relatively expensive and invasive test if that's not true.  */
+#if defined PATH_MAX && defined _SC_PAGESIZE
+  int bug_possible = PATH_MAX < sysconf (_SC_PAGESIZE);
+#else
+  int bug_possible = 0;
+#endif
+  if (! bug_possible)
+    return 0;
+
+  cwd = getcwd (NULL, 0);
+  if (cwd == NULL)
+    return 2;
+
+  initial_cwd_len = strlen (cwd);
+  free (cwd);
+
+  if (HAVE_OPENAT_SUPPORT)
+    {
+      static char const dir_name[] = "confdir-14B---";
+      size_t desired_depth = ((TARGET_LEN - 1 - initial_cwd_len)
+                              / sizeof dir_name);
+      size_t d;
+      for (d = 0; d < desired_depth; d++)
+        {
+          if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0)
+            {
+              if (! (errno == ERANGE || errno == ENAMETOOLONG
+                     || errno == ENOENT))
+                fail = 3; /* Unable to construct deep hierarchy.  */
+              break;
+            }
+        }
+
+      /* If libc has the bug in question, this invocation of getcwd
+         results in a failed assertion.  */
+      cwd = getcwd (NULL, 0);
+      if (cwd == NULL)
+        fail = 4; /* getcwd didn't assert, but it failed for a long name
+                     where the answer could have been learned.  */
+      free (cwd);
+
+      /* Call rmdir first, in case the above chdir failed.  */
+      rmdir (dir_name);
+      while (0 < d--)
+        {
+          if (chdir ("..") < 0)
+            {
+              fail = 5;
+              break;
+            }
+          rmdir (dir_name);
+        }
+    }
+
+  return fail;
+}
+
+/* The length of this name must be 8.  */
+#define DIR_NAME "confdir3"
+#define DIR_NAME_LEN 8
+#define DIR_NAME_SIZE (DIR_NAME_LEN + 1)
+
+/* The length of "../".  */
+#define DOTDOTSLASH_LEN 3
+
+/* Leftover bytes in the buffer, to work around library or OS bugs.  */
+#define BUF_SLOP 20
+
+/* Keep this test in sync with m4/getcwd-path-max.m4.  */
+static int
+test_long_name (void)
+{
+#ifndef PATH_MAX
+  /* The Hurd doesn't define this, so getcwd can't exhibit the bug --
+     at least not on a local file system.  And if we were to start worrying
+     about remote file systems, we'd have to enable the wrapper function
+     all of the time, just to be safe.  That's not worth the cost.  */
+  return 0;
+#elif ((INT_MAX / (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) \
+        - DIR_NAME_SIZE - BUF_SLOP) \
+       <= PATH_MAX)
+  /* FIXME: Assuming there's a system for which this is true,
+     this should be done in a compile test.  */
+  return 0;
+#else
+  /* For a process running under QEMU user-mode, the "/" directory is not
+     really the root directory, but the value of the QEMU_LD_PREFIX environment
+     variable or of the -L command-line option.  This causes the logic from
+     glibc/sysdeps/posix/getcwd.c to fail.  In this case, skip the test.  */
+  if (is_running_under_qemu_user ())
+    return 77;
+
+  char buf[PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1)
+           + DIR_NAME_SIZE + BUF_SLOP];
+  char *cwd = getcwd (buf, PATH_MAX);
+  size_t initial_cwd_len;
+  size_t cwd_len;
+  int fail = 0;
+  size_t n_chdirs = 0;
+
+  if (cwd == NULL)
+    return 1;
+
+  cwd_len = initial_cwd_len = strlen (cwd);
+
+  while (1)
+    {
+# ifdef HAVE_GETCWD_SHORTER
+      /* On OS/X <= 10.9 for example, we're restricted to shorter paths
+         as lstat() doesn't support more than PATH_MAX.  */
+      size_t dotdot_max = PATH_MAX * 2;
+# else
+      size_t dotdot_max = PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN);
+# endif
+      char *c = NULL;
+
+      cwd_len += DIR_NAME_SIZE;
+      /* If mkdir or chdir fails, it could be that this system cannot create
+         any file with an absolute name longer than PATH_MAX, such as cygwin.
+         If so, leave fail as 0, because the current working directory can't
+         be too long for getcwd if it can't even be created.  On Linux with
+         the 9p file system, mkdir fails with error EINVAL when cwd_len gets
+         too long; ignore this failure because the getcwd() system call
+         produces good results whereas the gnulib substitute calls getdents64
+         which fails with error EPROTO.
+         For other errors, be pessimistic and consider that as a failure,
+         too.  */
+      if (mkdir (DIR_NAME, S_IRWXU) < 0 || chdir (DIR_NAME) < 0)
+        {
+          if (! (errno == ERANGE || errno == ENAMETOOLONG || errno == ENOENT))
+            #ifdef __linux__
+            if (! (errno == EINVAL))
+            #endif
+              fail = 2;
+          break;
+        }
+
+      if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE)
+        {
+          c = getcwd (buf, PATH_MAX);
+          if (!c && errno == ENOENT)
+            {
+              fail = 3;
+              break;
+            }
+          if (c)
+            {
+              fail = 4;
+              break;
+            }
+          if (! (errno == ERANGE || errno == ENAMETOOLONG))
+            {
+              fail = 5;
+              break;
+            }
+        }
+
+      if (dotdot_max <= cwd_len - initial_cwd_len)
+        {
+          if (dotdot_max + DIR_NAME_SIZE < cwd_len - initial_cwd_len)
+            break;
+          c = getcwd (buf, cwd_len + 1);
+          if (!c)
+            {
+              if (! (errno == ERANGE || errno == ENOENT
+                     || errno == ENAMETOOLONG))
+                {
+                  fail = 6;
+                  break;
+                }
+              if (HAVE_OPENAT_SUPPORT || errno == ERANGE || errno == ENOENT)
+                {
+                  fail = 7;
+                  break;
+                }
+            }
+        }
+
+      if (c && strlen (c) != cwd_len)
+        {
+          fail = 8;
+          break;
+        }
+      ++n_chdirs;
+    }
+
+  /* Leaving behind such a deep directory is not polite.
+     So clean up here, right away, even though the driving
+     shell script would also clean up.  */
+  {
+    size_t i;
+
+    /* Try rmdir first, in case the chdir failed.  */
+    rmdir (DIR_NAME);
+    for (i = 0; i <= n_chdirs; i++)
+      {
+        if (chdir ("..") < 0)
+          break;
+        if (rmdir (DIR_NAME) != 0)
+          break;
+      }
+  }
+
+  return fail;
+#endif
+}
+
+int
+main ()
+{
+  int err1 = test_abort_bug ();
+  int err2 = test_long_name ();
+  int result = err1 * 10 + (err1 != 0 && err2 == 77 ? 0 : err2);
+  return (result ? result : test_exit_status);
+}