kc3-lang/gnulib/modules/lchown

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• Hash : 162ce0b7
  Author :
  Date : 2025-09-21T07:55:00
  

  fchownat: fix security races and other bugs
  
  This fixes some unlikely security races,
  where our “no-op” chmod undid some other process’s chmod.
  Ironically this bug occurred on OpenBSD, our most paranoid target.
  This patch also fixes some EOVERFLOW bugs,
  along with a performance bug and a CHOWN_CHANGE_TIME_BUG with fchownat.
  * lib/chown.c, lib/fchownat.c, lib/lchown.c:
  Remove unnecessary inconsistencies.
  Include stat-time.h.
  (CHOWN_CHANGE_TIME_BUG, CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE)
  (CHOWN_MODIFIES_SYMLINK, CHOWN_TRAILING_SLASH_BUG):
  Default to 0, and prefer ‘if (...)’ to ‘#ifdef ...’.
  (utimensat) [!HAVE_UTIMENSAT]: Default to a no-op.
  (rpl_chown, rpl_fchownat, rpl_lchown):
  Prefer ‘if (...)’ to ‘#ifdef ...’.
  Statically, call the stat-like and chown-like functions just once.
  Do not fail if the stat-like function fails with EOVERFLOW,
  if existence is all we care about.
  Use utimensat to update ctime, instead of a chmod-like function.
  * lib/fchownat.c (rpl_fchownat): Defend against OpenBSD’s
  CHOWN_CHANGE_TIME_BUG.  This bug in rpl_fchownat was exposed by
  yesterday’s fix that caused rpl_fchownat to call fchownat instead
  of using the tricky old fork/chdir business.
  * m4/chown.m4 (gl_FUNC_CHOWN):
  Check for utimensat if the ctime bug is present.
  * modules/chown, modules/lchown, modules/fchownat:
  (Depends-on): Add stat-time.
  

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• modules/lchown

• Description:
  lchown() function: change ownership of a file, without following symlinks.
  
  Files:
  lib/lchown.c
  m4/lchown.m4
  
  Depends-on:
  unistd-h
  bool            [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  chown           [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  errno-h         [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  issymlink       [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  stat-time       [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  sys_stat-h      [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1]
  lstat           [test $REPLACE_LCHOWN = 1]
  
  configure.ac:
  gl_FUNC_LCHOWN
  gl_CONDITIONAL([GL_COND_OBJ_LCHOWN],
                 [test $HAVE_LCHOWN = 0 || test $REPLACE_LCHOWN = 1])
  gl_UNISTD_MODULE_INDICATOR([lchown])
  
  Makefile.am:
  if GL_COND_OBJ_LCHOWN
  lib_SOURCES += lchown.c
  endif
  
  Include:
  <unistd.h>
  
  License:
  LGPLv2+
  
  Maintainer:
  Jim Meyering, Eric Blake
  

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