Commit Graph

3 Commits

Author SHA1 Message Date
Adhemerval Zanella
ccf970c7a7 posix: Add compat glob symbol to not follow dangling symbols
This patch follows commit 5554304f0 (posix: Allow glob to match dangling
symlinks [BZ #866]) by adding a compat symbol that follow previous
semantic of not following dangling symlinks and thus avoiding call
gl_lstat with GLOB_ALTDIRFUNC.

It avoids failure with old binaries that not set the alternate function
pointer for lstat (GNUmake for instance).  The following scenario, for
instance, fails with current GNUmake because glibc will access unitialized
memory when calling gl_lstat:

  $ cat src/t/t.c
  int main ()
  {
    return 0;
  }
  $ cat Makefile
  SRC = $(wildcard src/*/t.c)
  OBJ = $(patsubst src/%.c, obj/%.o, $(SRC))

  prog:           $(OBJ)
                  $(CC) $(CFLAGS) $(LDFLAGS) $(LIBS) $(OBJ) -o prog

  obj/%.o:        src/%.c
                  $(CC) $(CFLAGS) -c $< -o $@
  $ make

This works as expected with the patch applied.  Since it is for generic
ABI, default compat symbols are added with override for Linux due LFS.
Now we have two compat symbols for glob on Linux:

  1. sysdeps/unix/sysv/linux/oldglob.c which implements glob64 with
     the old dirent layout.  For this implementation I also set it to
     not follow dangling symlinks (which is the safest path).

  2. sysdeps/unix/sysv/linux/glob{64}-lstat-compat.c which implements
     the compat symbol for dangling symlinks.  As for generic glob,
     the implementation uses XSTAT_IS_XSTAT64 to define whether
     both __glob_lstat_compat and __glob64_lstat_compat should be
     different implementations.  For archictures that define
     XSTAT_IS_XSTAT64, __glob_lstat_compat is aliased to
     __glob64_lstat_compat.

  3. sysdeps/unix/sysv/linux/alpha/oldglob.c with a different glob_t
     layout.  As for 1. this patch changes it to not follow dangling
     symlinks.

The patch also bumps _GNU_GLOB_INTERFACE_VERSION to 2 to advertise the
new semantic.  On GNUmake, for instance, it will force to it use its
internal glob implementation instead and avoiding triggering the same
failure on builds against newer GLIBCs.

Checked on x86_64-linux-gnu and i686-linux-gnu.  I also checked
with a build against the major ABIs required to check for the abilist.

The changes should also work on gnulib (I run gnulib-tool.py check glob
and it shown no regressions).

	[BZ #22183]
	* include/gnu-versions.h (_GNU_GLOB_INTERFACE_VERSION): Increase
	version to 2.
	* posix/Makefile (routines): Add glob-lstat-compat and
	glob64-lstat-compat.
	* posix/Versions (GLIBC_2.27, glob, glob64): Add symbol version.
	* posix/glob-lstat-compat.c: New file.
	* posix/glob64-lstat-compat.c: Likewise.
	* posix/tst-glob_lstat_compat.c: Likewise.
	* sysdeps/unix/sysv/linux/glob-lstat-compat.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/glob-lstat-compat.c: Likewise.
	* sysdeps/unix/sysv/linux/glob64-lstat-compat.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/glob.c: Remove file.
	* posix/glob.c (glob_lstat): New function.
	(glob): Rename to __glob and add versioned symbol to 2.27.
	(glob_in_dir): Use glob_lstat.
	* posix/glob64.c (glob64): Add GLOB_ATTRIBUTE.
	* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/glob.c (glob): Add versioned symbol for
	2.27.
	* sysdeps/unix/sysv/linux/glob64.c (glob64): Likewise.
	* sysdeps/unix/sysv/linux/oldglob.c (GLOB_NO_LSTAT): Define.
	* sysdeps/unix/sysv/linux/alpha/oldglob.c (__old_glob): Do not use
	gl_lstat on glob call.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist: Add GLIBC_2.27 glob
	and glob64 symbols.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
	Likewise.
	* sysdeps/unix/linux/powerpc/powerpc32/nofpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
2017-09-25 18:04:16 -07:00
Adhemerval Zanella
116f1c64d8 posix: Consolidate Linux glob implementation
This patch consolidates the glob implementation.  The main changes are:

  * On Linux all implementation now uses the default one at
    sysdeps/unix/sysv/linux/glob{free}{64}.c with the exception
    of alpha (which requires specific versioning) and s390-32 (which
    different than other 32 bits ports it does not add a compat one
    symbol for 2.1 version).

  * The default implementation uses XSTAT_IS_XSTAT64 to define whether
    both glob{free} and glob{free}64 should be different implementations.
    For archictures that define XSTAT_IS_XSTAT64, glob{free} is an alias
    to glob{free}64.

  * Move i386 olddirent.h header to Linux default directory, since it is
    the only header with this name and it is shared among different
    architectures (and used on compat glob symbol as well).

Checked on x86_64-linux-gnu and on a build using build-many-glibcs.py
for all major architectures.

	* sysdeps/unix/sysv/linux/arm/glob64.c: Remove file.
	* sysdeps/unix/sysv/linux/i386/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/glob.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/globfree.c: Likewise.
	* sysdeps/wordsize-64/glob.c: Likewise.
	* sysdeps/wordsize-64/glob64.c: Likewise.
	* sysdeps/wordsize-64/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/glob.c: New file.
	* sysdeps/unix/sysv/linux/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/globfree.c: Likewise.
	* sysdeps/unix/sysv/linux/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/glob64.c: Likewise.
	* sysdeps/unix/sysv/linux/oldglob.c [SHLIB_COMPAT]: Also
	adds !GLOB_NO_OLD_VERSION as an extra condition.
	* sysdeps/unix/sysv/linux/i386/alphasort64.c: Include olddirent.h
	using relative path instead of absolute one.
	* sysdeps/unix/sysv/linux/i386/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/readdir64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/readdir64_r.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/versionsort64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/olddirent.h: Move to ...
	* sysdeps/unix/sysv/linux//olddirent.h: ... here.
2017-09-08 16:34:02 +02:00
Adhemerval Zanella
c66c908230 posix: Sync glob with gnulib [BZ #1062]
This patch syncs posix/glob.c implementation with gnulib version
b5ec983 (glob: simplify symlink detection).  The only difference
to gnulib code is

  * DT_UNKNOWN, DT_DIR, and DT_LNK definition in the case there
    were not already defined.  Gnulib code which uses
    HAVE_STRUCT_DIRENT_D_TYPE will redefine them wrongly because
    GLIBC does not define HAVE_STRUCT_DIRENT_D_TYPE.  Instead
    the patch check for each definition instead.

Also, the patch requires additional globfree and globfree64 files
for compatibility version on some architectures.  Also the code
simplification leads to not macro simplification (not need for
NO_GLOB_PATTERN_P anymore).

Checked on x86_64-linux-gnu and on a build using build-many-glibcs.py
for all major architectures.

	[BZ #1062]
	* posix/Makefile (routines): Add globfree, globfree64, and
	glob_pattern_p.
	* posix/flexmember.h: New file.
	* posix/glob_internal.h: Likewise.
	* posix/glob_pattern_p.c: Likewise.
	* posix/globfree.c: Likewise.
	* posix/globfree64.c: Likewise.
	* sysdeps/gnu/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/alpha/globfree.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/oldglob.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/globfree64.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/globfree.c: Likewise.
	* sysdeps/wordsize-64/globfree.c: Likewise.
	* sysdeps/wordsize-64/globfree64.c: Likewise.
	* posix/glob.c (HAVE_CONFIG_H): Use !_LIBC instead.
	[NDEBUG): Remove comments.
	(GLOB_ONLY_P, _AMIGA, VMS): Remove define.
	(dirent_type): New type.  Use uint_fast8_t not
	uint8_t, as C99 does not require uint8_t.
	(DT_UNKNOWN, DT_DIR, DT_LNK): New macros.
	(struct readdir_result): Use dirent_type.  Do not define skip_entry
	unless it is needed; this saves a byte on platforms lacking d_ino.
	(readdir_result_type, readdir_result_skip_entry):
	New functions, replacing ...
	(readdir_result_might_be_symlink, readdir_result_might_be_dir):
	 these functions, which were removed.  This makes the callers
	easier to read.  All callers changed.
	(D_INO_TO_RESULT): Now empty if there is no d_ino.
	(size_add_wrapv, glob_use_alloca): New static functions.
	(glob, glob_in_dir): Check for size_t overflow in several places,
	and fix some size_t checks that were not quite right.
	Remove old code using SHELL since Bash no longer
	uses this.
	(glob, prefix_array): Separate MS code better.
	(glob_in_dir): Remove old Amiga and VMS code.
	(globfree, __glob_pattern_type, __glob_pattern_p): Move to
	separate files.
	(glob_in_dir): Do not rely on undefined behavior in accessing
	struct members beyond their bounds.  Use a flexible array member
	instead
	(link_stat): Rename from link_exists2_p and return -1/0 instead of
	0/1.  Caller changed.
	(glob): Fix memory leaks.
	* posix/glob64 (globfree64): Move to separate file.
	* sysdeps/gnu/glob64.c (NO_GLOB_PATTERN_P): Remove define.
	(globfree64): Remove hidden alias.
	* sysdeps/unix/sysv/linux/Makefile (sysdeps_routines): Add
	oldglob.
	* sysdeps/unix/sysv/linux/alpha/glob.c (__new_globfree): Move to
	separate file.
	* sysdeps/unix/sysv/linux/i386/glob64.c (NO_GLOB_PATTERN_P): Remove
	define.
	Move compat code to separate file.
	* sysdeps/wordsize-64/glob.c (globfree): Move definitions to
	separate file.
2017-09-08 09:39:13 +02:00