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SUSE:SLE-12-SP2:GA
glibc-utils.6399
glob-altdirfunc.patch
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File glob-altdirfunc.patch of Package glibc-utils.6399
2016-05-04 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. 2016-04-29 Florian Weimer <fweimer@redhat.com> glob: Simplify and document the interface for the GLOB_ALTDIRFUNC callback function gl_readdir. * posix/glob.c (NAMELEN, CONVERT_D_NAMLEN): Remove. (CONVERT_DIRENT_DIRENT64): Use strcpy instead of memcpy. (glob_in_dir): Remove len. Use strdup instead of malloc and memcpy to copy the name. * manual/pattern.texi (Calling Glob): Document requirements for implementations of the gl_readdir callback function. * manual/examples/mkdirent.c: New example. * posix/bug-glob2.c (my_readdir): Set d_ino to 1 unconditionally, per the manual guidance. * posix/tst-gnuglob.c (my_readdir): Likewise. Index: glibc-2.19/manual/examples/mkdirent.c =================================================================== --- /dev/null +++ glibc-2.19/manual/examples/mkdirent.c @@ -0,0 +1,42 @@ +/* Example for creating a struct dirent object for use with glob. + Copyright (C) 2016 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 2 + 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, if not, see <http://www.gnu.org/licenses/>. +*/ + +#include <dirent.h> +#include <errno.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> + +struct dirent * +mkdirent (const char *name) +{ + size_t dirent_size = offsetof (struct dirent, d_name) + 1; + size_t name_length = strlen (name); + size_t total_size = dirent_size + name_length; + if (total_size < dirent_size) + { + errno = ENOMEM; + return NULL; + } + struct dirent *result = malloc (total_size); + if (result == NULL) + return NULL; + result->d_type = DT_UNKNOWN; + result->d_ino = 1; /* Do not skip this entry. */ + memcpy (result->d_name, name, name_length + 1); + return result; +} Index: glibc-2.19/manual/pattern.texi =================================================================== --- glibc-2.19.orig/manual/pattern.texi +++ glibc-2.19/manual/pattern.texi @@ -237,7 +237,44 @@ function used to read the contents of a @code{GLOB_ALTDIRFUNC} bit is set in the flag parameter. The type of this field is @w{@code{struct dirent *(*) (void *)}}. -This is a GNU extension. +An implementation of @code{gl_readdir} needs to initialize the following +members of the @code{struct dirent} object: + +@table @code +@item d_type +This member should be set to the file type of the entry if it is known. +Otherwise, the value @code{DT_UNKNOWN} can be used. The @code{glob} +function may use the specified file type to avoid callbacks in cases +where the file type indicates that the data is not required. + +@item d_ino +This member needs to be non-zero, otherwise @code{glob} may skip the +current entry and call the @code{gl_readdir} callback function again to +retrieve another entry. + +@item d_name +This member must be set to the name of the entry. It must be +null-terminated. +@end table + +The example below shows how to allocate a @code{struct dirent} object +containing a given name. + +@smallexample +@include mkdirent.c.texi +@end smallexample + +The @code{glob} function reads the @code{struct dirent} members listed +above and makes a copy of the file name in the @code{d_name} member +immediately after the @code{gl_readdir} callback function returns. +Future invocations of any of the callback functions may dealloacte or +reuse the buffer. It is the responsibility of the caller of the +@code{glob} function to allocate and deallocate the buffer, around the +call to @code{glob} or using the callback functions. For example, an +application could allocate the buffer in the @code{gl_readdir} callback +function, and deallocate it in the @code{gl_closedir} callback function. + +The @code{gl_readdir} member is a GNU extension. @item gl_opendir The address of an alternative implementation of the @code{opendir} Index: glibc-2.19/posix/bug-glob2.c =================================================================== --- glibc-2.19.orig/posix/bug-glob2.c +++ glibc-2.19/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; @@ -193,7 +205,7 @@ my_readdir (void *gdir) return NULL; } - dir->d.d_ino = dir->idx; + dir->d.d_ino = 1; /* glob should not skip this entry. */ #ifdef _DIRENT_HAVE_D_TYPE dir->d.d_type = filesystem[dir->idx].type; Index: glibc-2.19/posix/glob.c =================================================================== --- glibc-2.19.orig/posix/glob.c +++ glibc-2.19/posix/glob.c @@ -24,7 +24,9 @@ #include <errno.h> #include <sys/types.h> #include <sys/stat.h> +#include <stdbool.h> #include <stddef.h> +#include <stdint.h> /* Outcomment the following line for production quality code. */ /* #define NDEBUG 1 */ @@ -57,10 +59,8 @@ #if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__ # include <dirent.h> -# define NAMLEN(dirent) strlen((dirent)->d_name) #else # define dirent direct -# define NAMLEN(dirent) (dirent)->d_namlen # ifdef HAVE_SYS_NDIR_H # include <sys/ndir.h> # endif @@ -75,82 +75,8 @@ # endif /* HAVE_VMSDIR_H */ #endif - -/* In GNU systems, <dirent.h> defines this macro for us. */ -#ifdef _D_NAMLEN -# undef NAMLEN -# define NAMLEN(d) _D_NAMLEN(d) -#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 HAVE_DIRENT_H || defined __GNU_LIBRARY__ -# define CONVERT_D_NAMLEN(d64, d32) -# else -# define CONVERT_D_NAMLEN(d64, d32) \ - (d64)->d_namlen = (d32)->d_namlen; -# endif - -# 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) \ - memcpy ((d64)->d_name, (d32)->d_name, NAMLEN (d32) + 1); \ - CONVERT_D_NAMLEN (d64, d32) \ - 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 @@ -195,8 +121,111 @@ 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 + uint8_t 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. Keep in sync with + convert_dirent64 below. */ +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. Keep in + sync with convert_dirent above. */ +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 @@ -1561,56 +1590,36 @@ glob_in_dir (const char *pattern, const while (1) { - const char *name; - size_t len; -#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 (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)) - { - 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) { @@ -1630,12 +1639,10 @@ glob_in_dir (const char *pattern, const names = newnames; cur = 0; } - len = NAMLEN (d); - names->name[cur] = (char *) malloc (len + 1); + names->name[cur] = strdup (d.name); if (names->name[cur] == NULL) goto memory_error; - *((char *) mempcpy (names->name[cur++], name, len)) - = '\0'; + ++cur; ++nfound; } } Index: glibc-2.19/posix/tst-gnuglob.c =================================================================== --- glibc-2.19.orig/posix/tst-gnuglob.c +++ glibc-2.19/posix/tst-gnuglob.c @@ -211,7 +211,7 @@ my_readdir (void *gdir) return NULL; } - dir->d.d_ino = dir->idx; + dir->d.d_ino = 1; /* glob should not skip this entry. */ #ifdef _DIRENT_HAVE_D_TYPE dir->d.d_type = filesystem[dir->idx].type; Index: glibc-2.19/sysdeps/unix/sysv/linux/i386/glob64.c =================================================================== --- glibc-2.19.orig/sysdeps/unix/sysv/linux/i386/glob64.c +++ glibc-2.19/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, #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
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