Extended ELF ABI version handling only for Linux.

If the OSABI is generic we should not allow the ABI version to be nonzero.
Move all the new functionality into Linux-specific files.

ChangeLog

@@ -1,5 +1,15 @@
 2010-03-16  Ulrich Drepper  <drepper@redhat.com>
 
+	* elf/dl-load.c (VALID_ELF_ABIVERSION): Add additional osabi parameter.
+	Not used here.
+	(open_verify): Modify for extended VALID_ELF_ABIVERSION macro
+	interface.
+	* sysdeps/unix/sysv/linux/ldsodefs.h (VALID_ELF_ABIVERSION): Add
+	additional osabi parameter.  Only acceept nonzero ABI versions if osabi
+	is Linux.
+	Fix includes.
+	(expected2): Don't explicitly initialize EI_ABIVERSION byte.
+
 	* sysdeps/unix/sysv/linux/ldsodefs.h (VALID_ELF_ABIVERSION): Update
 	definition to follow generic code.
 

elf/dl-load.c

@@ -1569,7 +1569,7 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
 #ifndef VALID_ELF_HEADER
 # define VALID_ELF_HEADER(hdr,exp,size)	(memcmp (hdr, exp, size) == 0)
 # define VALID_ELF_OSABI(osabi)		(osabi == ELFOSABI_SYSV)
-# define VALID_ELF_ABIVERSION(ver)	(ver < LIBC_ABI_MAX)
+# define VALID_ELF_ABIVERSION(osabi,ver) (ver == 0)
 #elif defined MORE_ELF_HEADER_DATA
   MORE_ELF_HEADER_DATA;
 #endif
@@ -1656,7 +1656,8 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
       /* See whether the ELF header is what we expect.  */
       if (__builtin_expect (! VALID_ELF_HEADER (ehdr->e_ident, expected,
 						EI_ABIVERSION)
-			    || !VALID_ELF_ABIVERSION (ehdr->e_ident[EI_ABIVERSION]),
+			    || !VALID_ELF_ABIVERSION (ehdr->e_ident[EI_OSABI],
+						      ehdr->e_ident[EI_ABIVERSION]),
 			    0))
 	{
 	  /* Something is wrong.  */
@@ -1697,7 +1698,8 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
 	     allowed here.  */
 	  else if (!VALID_ELF_OSABI (ehdr->e_ident[EI_OSABI]))
 	    errstring = N_("ELF file OS ABI invalid");
-	  else if (!VALID_ELF_ABIVERSION (ehdr->e_ident[EI_ABIVERSION]))
+	  else if (!VALID_ELF_ABIVERSION (ehdr->e_ident[EI_OSABI],
+					  ehdr->e_ident[EI_ABIVERSION]))
 	    errstring = N_("ELF file ABI version invalid");
 	  else
 	    /* Otherwise we don't know what went wrong.  */

sysdeps/unix/sysv/linux/ldsodefs.h

@@ -1,5 +1,5 @@
 /* Run-time dynamic linker data structures for loaded ELF shared objects.
-   Copyright (C) 2001, 2002, 2003, 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2002, 2003, 2006, 2009, 2010 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -19,6 +19,7 @@
 
 #ifndef	_LDSODEFS_H
 
+#include <libc-abis.h>
 #include <kernel-features.h>
 
 /* Get the real definitions.  */
@@ -58,7 +59,8 @@ extern void _dl_non_dynamic_init (void) internal_function;
 					 || memcmp (hdr, expected2, size) == 0)
 #define VALID_ELF_OSABI(osabi)		(osabi == ELFOSABI_SYSV \
 					 || osabi == ELFOSABI_LINUX)
-#define VALID_ELF_ABIVERSION(ver)	(ver < LIBC_ABI_MAX)
+#define VALID_ELF_ABIVERSION(osabi,ver) \
+  (ver == 0 || (osabi == ELFOSABI_LINUX && ver < LIBC_ABI_MAX))
 #define MORE_ELF_HEADER_DATA \
   static const unsigned char expected2[EI_PAD] =	\
   {							\
@@ -69,8 +71,7 @@ extern void _dl_non_dynamic_init (void) internal_function;
     [EI_CLASS] = ELFW(CLASS),				\
     [EI_DATA] = byteorder,				\
     [EI_VERSION] = EV_CURRENT,				\
-    [EI_OSABI] = ELFOSABI_LINUX,			\
-    [EI_ABIVERSION] = 0					\
+    [EI_OSABI] = ELFOSABI_LINUX				\
   }
 
 #endif /* ldsodefs.h */