[BZ #5818]

	* nscd/connections.c (dbs): Add initializers for .suggested_module.
	(verify_persistent_db): Remove one unnecessary test and add a new one
	for bad configuration.
	(nscd_init): Improve error reported when persistent database cannot
	be reused.
	* nscd/nscd.h (DEFAULT_SUGGESTED_MODULE): Define.
	* nscd/nscd_conf.c (nscd_parse_file): Provide default values for
	.suggested_module and .max_db_size and case config file says the
	values are zero.
	* nscd/nscd_helper.c (get_mapping): Fail if hash table module is zero.

4 files changed, 37 insertions, 27 deletions

diff --git a/nscd/connections.c b/nscd/connections.c
index 8140e96821..5da5e5f08a 100644
--- a/nscd/connections.c
+++ b/nscd/connections.c
@@ -1,6 +1,5 @@
 /* Inner loops of cache daemon.
-   Copyright (C) 1998-2003, 2004, 2005, 2006, 2007, 2008
-   Free Software Foundation, Inc.
+   Copyright (C) 1998-2007, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
@@ -112,7 +111,8 @@ struct database_dyn dbs[lastdb] =
     .propagate = 1,
     .shared = 0,
     .max_db_size = DEFAULT_MAX_DB_SIZE,
-    .reset_res = 0,
+    .suggested_module = DEFAULT_SUGGESTED_MODULE,
+   .reset_res = 0,
     .filename = "/etc/passwd",
     .db_filename = _PATH_NSCD_PASSWD_DB,
     .disabled_iov = &pwd_iov_disabled,
@@ -131,6 +131,7 @@ struct database_dyn dbs[lastdb] =
     .propagate = 1,
     .shared = 0,
     .max_db_size = DEFAULT_MAX_DB_SIZE,
+    .suggested_module = DEFAULT_SUGGESTED_MODULE,
     .reset_res = 0,
     .filename = "/etc/group",
     .db_filename = _PATH_NSCD_GROUP_DB,
@@ -150,6 +151,7 @@ struct database_dyn dbs[lastdb] =
     .propagate = 0,		/* Not used.  */
     .shared = 0,
     .max_db_size = DEFAULT_MAX_DB_SIZE,
+    .suggested_module = DEFAULT_SUGGESTED_MODULE,
     .reset_res = 1,
     .filename = "/etc/hosts",
     .db_filename = _PATH_NSCD_HOSTS_DB,
@@ -169,6 +171,7 @@ struct database_dyn dbs[lastdb] =
     .propagate = 0,		/* Not used.  */
     .shared = 0,
     .max_db_size = DEFAULT_MAX_DB_SIZE,
+    .suggested_module = DEFAULT_SUGGESTED_MODULE,
     .reset_res = 0,
     .filename = "/etc/services",
     .db_filename = _PATH_NSCD_SERVICES_DB,
@@ -346,7 +349,7 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr)
   struct database_pers_head head_copy = *head;
 
   /* Check that the header that was read matches the head in the database.  */
-  if (readhead != NULL && memcmp (head, readhead, sizeof (*head)) != 0)
+  if (memcmp (head, readhead, sizeof (*head)) != 0)
     return 0;
 
   /* First some easy tests: make sure the database header is sane.  */
@@ -356,6 +359,7 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr)
 	 This should cover daylight saving time changes.  */
       || head->timestamp > now + 60 * 60 + 60
       || (head->gc_cycle & 1)
+      || head->module == 0
       || (size_t) head->module > INT32_MAX / sizeof (ref_t)
       || (size_t) head->data_size > INT32_MAX - head->module * sizeof (ref_t)
       || head->first_free < 0
@@ -506,6 +510,7 @@ nscd_init (void)
 	    int fd = open (dbs[cnt].db_filename, O_RDWR | EXTRA_O_FLAGS);
 	    if (fd != -1)
 	      {
+		char *msg = NULL;
 		struct stat64 st;
 		void *mem;
 		size_t total;
@@ -514,23 +519,26 @@ nscd_init (void)
 						      sizeof (head)));
 		if (n != sizeof (head) || fstat64 (fd, &st) != 0)
 		  {
+		  fail_db_errno:
+		    /* The code is single-threaded at this point so
+		       using strerror is just fine.  */
+		    msg = strerror (errno);
 		  fail_db:
 		    dbg_log (_("invalid persistent database file \"%s\": %s"),
-			     dbs[cnt].db_filename, strerror (errno));
+			     dbs[cnt].db_filename, msg);
 		    unlink (dbs[cnt].db_filename);
 		  }
 		else if (head.module == 0 && head.data_size == 0)
 		  {
-		    /* The file has been created, but the head has not been
-		       initialized yet.  Remove the old file.  */
-		    unlink (dbs[cnt].db_filename);
+		    /* The file has been created, but the head has not
+		       been initialized yet.  */
+		    msg = _("uninitialized header");
+		    goto fail_db;
 		  }
 		else if (head.header_size != (int) sizeof (head))
 		  {
-		    dbg_log (_("invalid persistent database file \"%s\": %s"),
-			     dbs[cnt].db_filename,
-			     _("header size does not match"));
-		    unlink (dbs[cnt].db_filename);
+		    msg = _("header size does not match");
+		    goto fail_db;
 		  }
 		else if ((total = (sizeof (head)
 				   + roundup (head.module * sizeof (ref_t),
@@ -539,10 +547,8 @@ nscd_init (void)
 			 > st.st_size
 			 || total < sizeof (head))
 		  {
-		    dbg_log (_("invalid persistent database file \"%s\": %s"),
-			     dbs[cnt].db_filename,
-			     _("file size does not match"));
-		    unlink (dbs[cnt].db_filename);
+		    msg = _("file size does not match");
+		    goto fail_db;
 		  }
 		/* Note we map with the maximum size allowed for the
 		   database.  This is likely much larger than the
@@ -554,14 +560,12 @@ nscd_init (void)
 				      PROT_READ | PROT_WRITE,
 				      MAP_SHARED, fd, 0))
 			 == MAP_FAILED)
-		  goto fail_db;
+		  goto fail_db_errno;
 		else if (!verify_persistent_db (mem, &head, cnt))
 		  {
 		    munmap (mem, total);
-		    dbg_log (_("invalid persistent database file \"%s\": %s"),
-			     dbs[cnt].db_filename,
-			     _("verification failed"));
-		    unlink (dbs[cnt].db_filename);
+		    msg = _("verification failed");
+		    goto fail_db;
 		  }
 		else
 		  {
diff --git a/nscd/nscd.h b/nscd/nscd.h
index cd6fe15c30..ec2d9454ca 100644
--- a/nscd/nscd.h
+++ b/nscd/nscd.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
+/* Copyright (c) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
@@ -120,6 +120,9 @@ struct database_dyn
 /* Number of bytes of data we initially reserve for each hash table bucket.  */
 #define DEFAULT_DATASIZE_PER_BUCKET 1024
 
+/* Default module of hash table.  */
+#define DEFAULT_SUGGESTED_MODULE 211
+
 
 /* Number of seconds between two cache pruning runs if we do not have
    better information when it is really needed.  */
diff --git a/nscd/nscd_conf.c b/nscd/nscd_conf.c
index 0d5a5f2d8c..9d0ef0e43d 100644
--- a/nscd/nscd_conf.c
+++ b/nscd/nscd_conf.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 1998, 2000, 2003-2006, 2007 Free Software Foundation, Inc.
+/* Copyright (c) 1998, 2000, 2003-2007, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
 
@@ -140,7 +140,8 @@ nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
 	{
 	  int idx = find_db (arg1);
 	  if (idx >= 0)
-	    dbs[idx].suggested_module = atol (arg2);
+	    dbs[idx].suggested_module
+	      = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
 	}
       else if (strcmp (entry, "enable-cache") == 0)
 	{
@@ -168,7 +169,7 @@ nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
 	{
 	  int idx = find_db (arg1);
 	  if (idx >= 0)
-	    dbs[idx].max_db_size = atol (arg2);
+	    dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
 	}
       else if (strcmp (entry, "logfile") == 0)
 	set_logfile (arg1);
diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c
index 866535200f..9828a46df0 100644
--- a/nscd/nscd_helper.c
+++ b/nscd/nscd_helper.c
@@ -1,5 +1,4 @@
-/* Copyright (C) 1998-2002,2003,2004,2005,2006,2007
-   Free Software Foundation, Inc.
+/* Copyright (C) 1998-2007, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
@@ -339,6 +338,9 @@ get_mapping (request_type type, const char *key,
 
       if (__builtin_expect (head->version != DB_VERSION, 0)
 	  || __builtin_expect (head->header_size != sizeof (*head), 0)
+	  /* Catch some misconfiguration.  The server should catch
+	     them now but some older versions did not.  */
+	  || __builtin_expect (head->module == 0, 0)
 	  /* This really should not happen but who knows, maybe the update
 	     thread got stuck.  */
 	  || __builtin_expect (! head->nscd_certainly_running