			     BASH PATCH REPORT
			     =================

Bash-Release:	5.3
Patch-ID:	bash53-002

Bug-Reported-by:	
Bug-Reference-ID:
Bug-Reference-URL:	https://savannah.gnu.org/bugs/?67326

Bug-Description:

There are too many differences in the various implementations of shm_open(2)
to rely on it for bash's use.

Patch (apply with `patch -p0'):

*** ../bash-5.3-patched/lib/sh/anonfile.c	Tue Jul  9 11:41:57 2024
--- lib/sh/anonfile.c	Thu Jul 17 11:03:23 2025
***************
*** 26,30 ****
  #include <bashtypes.h>
  
! #if defined (HAVE_MEMFD_CREATE) || defined (HAVE_SHM_OPEN) || defined (HAVE_SHM_MKSTEMP)
  #  include <sys/mman.h>
  #endif
--- 26,30 ----
  #include <bashtypes.h>
  
! #if defined (HAVE_MEMFD_CREATE) || defined (HAVE_SHM_MKSTEMP)
  #  include <sys/mman.h>
  #endif
***************
*** 42,57 ****
  #endif
  
! #if defined (HAVE_SHM_OPEN)
! #ifndef O_NOFOLLOW
! #  define O_NOFOLLOW 0
! #endif
! 
  static int
- anonshmunlink (const char *fn)
- {
-   return (shm_unlink (fn));
- }
- 
- static int
  anonshmopen (const char *name, int flags, char **fn)
  {
--- 42,47 ----
  #endif
  
! #if defined (HAVE_SHM_MKSTEMP)
  static int
  anonshmopen (const char *name, int flags, char **fn)
  {
***************
*** 63,95 ****
      *fn = 0;
  
- #if defined (HAVE_SHM_MKSTEMP)
    fname = savestring ("/shm-XXXXXXXXXX");
    fd = shm_mkstemp (fname);
    if (fd < 0)
-     free (fname);
- #endif
- 
-   if (fd < 0)
      {
-       fname = sh_mktmpname (name, flags);
-       fd = shm_open (fname, O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, 0600);
-     }
- 
-   if (fd < 0)
-     {
        free (fname);
        return fd;
      }
  
-   if (shm_unlink (fname) < 0)
-     {
-       int o;
-       o = errno;
-       free (fname);
-       close (fd);
-       errno = o;
-       return -1;
-     }
- 
    if (fn)
      *fn = fname;
--- 53,64 ----
***************
*** 123,127 ****
    flag = (name && *name == '/') ? MT_TEMPLATE : MT_USETMPDIR;
  
! #if defined (HAVE_SHM_OPEN)
    fd = anonshmopen (name, flag, fn);
    if (fd >= 0)
--- 92,96 ----
    flag = (name && *name == '/') ? MT_TEMPLATE : MT_USETMPDIR;
  
! #if defined (HAVE_SHM_MKSTEMP)
    fd = anonshmopen (name, flag, fn);
    if (fd >= 0)

*** ../bash-5.3/patchlevel.h	2020-06-22 14:51:03.000000000 -0400
--- patchlevel.h	2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 1
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 2
  
  #endif /* _PATCHLEVEL_H_ */
