commit 2aa0974d2573441bffd596b07bff8698b1f2f18c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Oct 20 14:29:50 2023 +0200

    elf: ldconfig should skip temporary files created by package managers
    
    This avoids crashes due to partially written files, after a package
    update is interrupted.
    
    Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

Conflicts:
	elf/ldconfig.c
	  (missing alloca removal downstream)

diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index 8c66d7e5426d8cc4..51de08f91fbaf093 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -771,6 +771,31 @@ struct dlib_entry
   struct dlib_entry *next;
 };
 
+/* Skip some temporary DSO files.  These files may be partially written
+   and lead to ldconfig crashes when examined.  */
+static bool
+skip_dso_based_on_name (const char *name, size_t len)
+{
+  /* Skip temporary files created by the prelink program.  Files with
+     names like these are never really DSOs we want to look at.  */
+  if (len >= sizeof (".#prelink#") - 1)
+    {
+      if (strcmp (name + len - sizeof (".#prelink#") + 1,
+		  ".#prelink#") == 0)
+	return true;
+      if (len >= sizeof (".#prelink#.XXXXXX") - 1
+	  && memcmp (name + len - sizeof (".#prelink#.XXXXXX")
+		     + 1, ".#prelink#.", sizeof (".#prelink#.") - 1) == 0)
+	return true;
+    }
+  /* Skip temporary files created by RPM.  */
+  if (memchr (name, len, ';') != NULL)
+    return true;
+  /* Skip temporary files created by dpkg.  */
+  if (len > 4 && memcmp (name + len - 4, ".tmp", 4) == 0)
+    return true;
+  return false;
+}
 
 static void
 search_dir (const struct dir_entry *entry)
@@ -849,18 +874,8 @@ search_dir (const struct dir_entry *entry)
 	continue;
 
       size_t len = strlen (direntry->d_name);
-      /* Skip temporary files created by the prelink program.  Files with
-	 names like these are never really DSOs we want to look at.  */
-      if (len >= sizeof (".#prelink#") - 1)
-	{
-	  if (strcmp (direntry->d_name + len - sizeof (".#prelink#") + 1,
-		      ".#prelink#") == 0)
-	    continue;
-	  if (len >= sizeof (".#prelink#.XXXXXX") - 1
-	      && memcmp (direntry->d_name + len - sizeof (".#prelink#.XXXXXX")
-			 + 1, ".#prelink#.", sizeof (".#prelink#.") - 1) == 0)
-	    continue;
-	}
+      if (skip_dso_based_on_name (direntry->d_name, len))
+	continue;
       len += strlen (entry->path) + 2;
       if (len > file_name_len)
 	{
