From 2ea3d6064911104d8e0437cb75b0e2559b0cd1b2 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Wed, 23 Jul 2025 15:47:12 -0400
Subject: [PATCH] Bash-5.3 patch 2: do not try to use shm_open, there is too
 much variance in behavior across systems

---
 lib/sh/anonfile.c | 37 +++----------------------------------
 patchlevel.h      |  2 +-
 2 files changed, 4 insertions(+), 35 deletions(-)

diff --git a/lib/sh/anonfile.c b/lib/sh/anonfile.c
index c3c3c699..4fe56bdd 100644
--- a/lib/sh/anonfile.c
+++ b/lib/sh/anonfile.c
@@ -25,7 +25,7 @@
 #endif
 #include <bashtypes.h>
 
-#if defined (HAVE_MEMFD_CREATE) || defined (HAVE_SHM_OPEN) || defined (HAVE_SHM_MKSTEMP)
+#if defined (HAVE_MEMFD_CREATE) || defined (HAVE_SHM_MKSTEMP)
 #  include <sys/mman.h>
 #endif
 #include <filecntl.h>
@@ -41,17 +41,7 @@ static int anonunlink (const char *);
 #  define MFD_NOEXEC_SEAL 0
 #endif
 
-#if defined (HAVE_SHM_OPEN)
-#ifndef O_NOFOLLOW
-#  define O_NOFOLLOW 0
-#endif
-
-static int
-anonshmunlink (const char *fn)
-{
-  return (shm_unlink (fn));
-}
-
+#if defined (HAVE_SHM_MKSTEMP)
 static int
 anonshmopen (const char *name, int flags, char **fn)
 {
@@ -62,35 +52,14 @@ anonshmopen (const char *name, int flags, char **fn)
   if (fn)
     *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;
   else
@@ -122,7 +91,7 @@ anonopen (const char *name, int flags, char **fn)
   /* Heuristic */
   flag = (name && *name == '/') ? MT_TEMPLATE : MT_USETMPDIR;
 
-#if defined (HAVE_SHM_OPEN)
+#if defined (HAVE_SHM_MKSTEMP)
   fd = anonshmopen (name, flag, fn);
   if (fd >= 0)
     return fd;		/* anonshmopen sets *FN appropriately */
diff --git a/patchlevel.h b/patchlevel.h
index e473bd5a..ceabc701 100644
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 1
+#define PATCHLEVEL 2
 
 #endif /* _PATCHLEVEL_H_ */
-- 
2.47.3