This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] glob: Avoid copying the d_name field of struct dirent [BZ #19779]


On 04/01/2016 11:55 PM, Roland McGrath wrote:
I can remove the use of d_namlen as a separate patch, before the copy
avoidance.  I did not realize it has implications on application
behavior at the time, for which I apologize.  But now, I still think
it's a desirable improvement.

That sounds great.

Now that the d_namlen change is in, here is a rebased version of the CVE-2016-1234 fix.

This version keeps the d_ino-guided skipping.

Tested on x86_64 and i386.

Thanks,
Florian
2016-04-01  Florian Weimer  <fweimer@redhat.com>

	[BZ #19779]
	CVE-2016-1234
	Avoid copying names of directory entries.
	* posix/glob.c (DIRENT_MUST_BE, DIRENT_MIGHT_BE_SYMLINK)
	(DIRENT_MIGHT_BE_DIR, CONVERT_D_INO, CONVERT_D_TYPE)
	(CONVERT_DIRENT_DIRENT64, REAL_DIR_ENTRY): Remove macros.
	(struct readdir_result): New type.
	(D_TYPE_TO_RESULT, D_INO_TO_RESULT, READDIR_RESULT_INITIALIZER)
	(GL_READDIR): New macros.
	(readdir_result_might_be_symlink, readdir_result_might_be_dir)
	(convert_dirent, convert_dirent64): New functions.
	(glob_in_dir): Use struct readdir_result.  Call convert_dirent or
	convert_dirent64.  Adjust references to the readdir result.
	* sysdeps/unix/sysv/linux/i386/glob64.c:
	(convert_dirent, GL_READDIR): Redefine for second file inclusion.
	* posix/bug-glob2.c (LONG_NAME): Define.
	(filesystem): Add LONG_NAME.
	(my_DIR): Increase the size of room_for_dirent.

diff --git a/posix/bug-glob2.c b/posix/bug-glob2.c
index 0fdc5d0..5873e08 100644
--- a/posix/bug-glob2.c
+++ b/posix/bug-glob2.c
@@ -40,6 +40,17 @@
 # define PRINTF(fmt, args...)
 #endif
 
+#define LONG_NAME \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
+  "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 
 static struct
 {
@@ -58,6 +69,7 @@ static struct
       { ".", 3, DT_DIR, 0755 },
       { "..", 3, DT_DIR, 0755 },
       { "a", 3, DT_REG, 0644 },
+      { LONG_NAME, 3, DT_REG, 0644 },
     { "unreadable", 2, DT_DIR, 0111 },
       { ".", 3, DT_DIR, 0111 },
       { "..", 3, DT_DIR, 0755 },
@@ -75,7 +87,7 @@ typedef struct
   int level;
   int idx;
   struct dirent d;
-  char room_for_dirent[NAME_MAX];
+  char room_for_dirent[sizeof (LONG_NAME)];
 } my_DIR;
 
 
diff --git a/posix/glob.c b/posix/glob.c
index 9ae76ac..f687023 100644
--- a/posix/glob.c
+++ b/posix/glob.c
@@ -24,6 +24,7 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <stdbool.h>
 #include <stddef.h>
 
 /* Outcomment the following line for production quality code.  */
@@ -73,69 +74,8 @@
 # endif /* HAVE_VMSDIR_H */
 #endif
 
-
-/* When used in the GNU libc the symbol _DIRENT_HAVE_D_TYPE is available
-   if the `d_type' member for `struct dirent' is available.
-   HAVE_STRUCT_DIRENT_D_TYPE plays the same role in GNULIB.  */
-#if defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE
-/* True if the directory entry D must be of type T.  */
-# define DIRENT_MUST_BE(d, t)	((d)->d_type == (t))
-
-/* True if the directory entry D might be a symbolic link.  */
-# define DIRENT_MIGHT_BE_SYMLINK(d) \
-    ((d)->d_type == DT_UNKNOWN || (d)->d_type == DT_LNK)
-
-/* True if the directory entry D might be a directory.  */
-# define DIRENT_MIGHT_BE_DIR(d)	 \
-    ((d)->d_type == DT_DIR || DIRENT_MIGHT_BE_SYMLINK (d))
-
-#else /* !HAVE_D_TYPE */
-# define DIRENT_MUST_BE(d, t)		false
-# define DIRENT_MIGHT_BE_SYMLINK(d)	true
-# define DIRENT_MIGHT_BE_DIR(d)		true
-#endif /* HAVE_D_TYPE */
-
-/* If the system has the `struct dirent64' type we use it internally.  */
-#if defined _LIBC && !defined COMPILE_GLOB64
-
-# if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
-#  define CONVERT_D_INO(d64, d32)
-# else
-#  define CONVERT_D_INO(d64, d32) \
-  (d64)->d_ino = (d32)->d_ino;
-# endif
-
-# ifdef _DIRENT_HAVE_D_TYPE
-#  define CONVERT_D_TYPE(d64, d32) \
-  (d64)->d_type = (d32)->d_type;
-# else
-#  define CONVERT_D_TYPE(d64, d32)
-# endif
-
-# define CONVERT_DIRENT_DIRENT64(d64, d32) \
-  strcpy ((d64)->d_name, (d32)->d_name);				      \
-  CONVERT_D_INO (d64, d32)						      \
-  CONVERT_D_TYPE (d64, d32)
-#endif
-
-
-#if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
-/* Posix does not require that the d_ino field be present, and some
-   systems do not provide it. */
-# define REAL_DIR_ENTRY(dp) 1
-#else
-# define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
-#endif /* POSIX */
-
 #include <stdlib.h>
 #include <string.h>
-
-/* NAME_MAX is usually defined in <dirent.h> or <limits.h>.  */
-#include <limits.h>
-#ifndef NAME_MAX
-# define NAME_MAX (sizeof (((struct dirent *) 0)->d_name))
-#endif
-
 #include <alloca.h>
 
 #ifdef _LIBC
@@ -180,8 +120,109 @@
 
 static const char *next_brace_sub (const char *begin, int flags) __THROWNL;
 
+/* A representation of a directory entry which does not depend on the
+   layout of struct dirent, or the size of ino_t.  */
+struct readdir_result
+{
+  const char *name;
+# if defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE
+  unsigned char type;
+# endif
+  bool skip_entry;
+};
+
+# if defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE
+/* Initializer based on the d_type member of struct dirent.  */
+#  define D_TYPE_TO_RESULT(source) (source)->d_type,
+
+/* True if the directory entry D might be a symbolic link.  */
+static bool
+readdir_result_might_be_symlink (struct readdir_result d)
+{
+  return d.type == DT_UNKNOWN || d.type == DT_LNK;
+}
+
+/* True if the directory entry D might be a directory.  */
+static bool
+readdir_result_might_be_dir (struct readdir_result d)
+{
+  return d.type == DT_DIR || readdir_result_might_be_symlink (d);
+}
+# else /* defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE */
+#  define D_TYPE_TO_RESULT(source)
+
+/* If we do not have type information, symbolic links and directories
+   are always a possibility.  */
+
+static bool
+readdir_result_might_be_symlink (struct readdir_result d)
+{
+  return true;
+}
+
+static bool
+readdir_result_might_be_dir (struct readdir_result d)
+{
+  return true;
+}
+
+# endif /* defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE */
+
+# if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
+/* Initializer for skip_entry.  POSIX does not require that the d_ino
+   field be present, and some systems do not provide it. */
+#  define D_INO_TO_RESULT(source) false,
+# else
+#  define D_INO_TO_RESULT(source) (source)->d_ino == 0,
+# endif
+
+/* Construct an initializer for a struct readdir_result object from a
+   struct dirent *.  No copy of the name is made.  */
+#define READDIR_RESULT_INITIALIZER(source) \
+  {					   \
+    source->d_name,			   \
+    D_TYPE_TO_RESULT (source)		   \
+    D_INO_TO_RESULT (source)		   \
+  }
+
 #endif /* !defined _LIBC || !defined GLOB_ONLY_P */
 
+/* Call gl_readdir on STREAM.  This macro can be overridden to reduce
+   type safety if an old interface version needs to be supported.  */
+#ifndef GL_READDIR
+# define GL_READDIR(pglob, stream) ((pglob)->gl_readdir (stream))
+#endif
+
+/* Extract name and type from directory entry.  No copy of the name is
+   made.  If SOURCE is NULL, result name is NULL.  */
+static struct readdir_result
+convert_dirent (const struct dirent *source)
+{
+  if (source == NULL)
+    {
+      struct readdir_result result = {NULL};
+      return result;
+    }
+  struct readdir_result result = READDIR_RESULT_INITIALIZER (source);
+  return result;
+}
+
+#ifndef COMPILE_GLOB64
+/* Like convert_dirent, but works on struct dirent64 instead.  */
+static struct readdir_result
+convert_dirent64 (const struct dirent64 *source)
+{
+  if (source == NULL)
+    {
+      struct readdir_result result = {NULL};
+      return result;
+    }
+  struct readdir_result result = READDIR_RESULT_INITIALIZER (source);
+  return result;
+}
+#endif
+
+
 #ifndef attribute_hidden
 # define attribute_hidden
 #endif
@@ -1538,55 +1579,36 @@ glob_in_dir (const char *pattern, const char *directory, int flags,
 
 	  while (1)
 	    {
-	      const char *name;
-#if defined _LIBC && !defined COMPILE_GLOB64
-	      struct dirent64 *d;
-	      union
-		{
-		  struct dirent64 d64;
-		  char room [offsetof (struct dirent64, d_name[0])
-			     + NAME_MAX + 1];
-		}
-	      d64buf;
-
-	      if (__glibc_unlikely (flags & GLOB_ALTDIRFUNC))
-		{
-		  struct dirent *d32 = (*pglob->gl_readdir) (stream);
-		  if (d32 != NULL)
-		    {
-		      CONVERT_DIRENT_DIRENT64 (&d64buf.d64, d32);
-		      d = &d64buf.d64;
-		    }
-		  else
-		    d = NULL;
-		}
-	      else
-		d = __readdir64 (stream);
+	      struct readdir_result d;
+	      {
+		if (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0))
+		  d = convert_dirent (GL_READDIR (pglob, stream));
+		else
+		  {
+#ifdef COMPILE_GLOB64
+		    d = convert_dirent (__readdir (stream));
 #else
-	      struct dirent *d = (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
-				  ? ((struct dirent *)
-				     (*pglob->gl_readdir) (stream))
-				  : __readdir (stream));
+		    d = convert_dirent64 (__readdir64 (stream));
 #endif
-	      if (d == NULL)
+		  }
+	      }
+	      if (d.name == NULL)
 		break;
-	      if (! REAL_DIR_ENTRY (d))
+	      if (d.skip_entry)
 		continue;
 
 	      /* If we shall match only directories use the information
 		 provided by the dirent call if possible.  */
-	      if ((flags & GLOB_ONLYDIR) && !DIRENT_MIGHT_BE_DIR (d))
+	      if ((flags & GLOB_ONLYDIR) && !readdir_result_might_be_dir (d))
 		continue;
 
-	      name = d->d_name;
-
-	      if (fnmatch (pattern, name, fnm_flags) == 0)
+	      if (fnmatch (pattern, d.name, fnm_flags) == 0)
 		{
 		  /* If the file we found is a symlink we have to
 		     make sure the target file exists.  */
-		  if (!DIRENT_MIGHT_BE_SYMLINK (d)
-		      || link_exists_p (dfd, directory, dirlen, name, pglob,
-					flags))
+		  if (!readdir_result_might_be_symlink (d)
+		      || link_exists_p (dfd, directory, dirlen, d.name,
+					pglob, flags))
 		    {
 		      if (cur == names->count)
 			{
@@ -1606,7 +1628,7 @@ glob_in_dir (const char *pattern, const char *directory, int flags,
 			  names = newnames;
 			  cur = 0;
 			}
-		      names->name[cur] = strdup (d->d_name);
+		      names->name[cur] = strdup (d.name);
 		      if (names->name[cur] == NULL)
 			goto memory_error;
 		      ++cur;
diff --git a/sysdeps/unix/sysv/linux/i386/glob64.c b/sysdeps/unix/sysv/linux/i386/glob64.c
index b4fcd1a..802c957 100644
--- a/sysdeps/unix/sysv/linux/i386/glob64.c
+++ b/sysdeps/unix/sysv/linux/i386/glob64.c
@@ -1,3 +1,21 @@
+/* Two glob variants with 64-bit support, for dirent64 and __olddirent64.
+   Copyright (C) 1998-2016 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 <dirent.h>
 #include <glob.h>
 #include <sys/stat.h>
@@ -38,11 +56,15 @@ int __old_glob64 (const char *__pattern, int __flags,
 
 #undef dirent
 #define dirent __old_dirent64
+#undef GL_READDIR
+# define GL_READDIR(pglob, stream) \
+  ((struct __old_dirent64 *) (pglob)->gl_readdir (stream))
 #undef __readdir
 #define __readdir(dirp) __old_readdir64 (dirp)
 #undef glob
 #define glob(pattern, flags, errfunc, pglob) \
   __old_glob64 (pattern, flags, errfunc, pglob)
+#define convert_dirent __old_convert_dirent
 #define glob_in_dir __old_glob_in_dir
 #define GLOB_ATTRIBUTE attribute_compat_text_section
 

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]