Implement handling of libc ABI in ELF header.

ChangeLog

@@ -1,3 +1,11 @@
+2010-03-15  Ulrich Drepper  <drepper@redhat.com>
+
+	* Makerules: Add rule for libc-abis.h.
+	* csu/version.c: Use LIBC_ABIS_STRING string if available.
+	* elf/dl-load.c (VALID_ELF_ABIVERSION): Check using LIBC_ABI_MAX.
+	(open_verify): Only check EI_ABIVERSION bytes using VALID_ELF_HEADER.
+	Add extra call to VALID_ELF_ABIVERSION.
+
 2010-03-12  Ulrich Drepper  <drepper@redhat.com>
 
 	* sysdeps/unix/sysv/linux/sys/mount.h (UMOUNT_NOFOLLOW): Define.

Makerules

@@ -1,4 +1,4 @@
-# Copyright (C) 1991-2006,2007,2008,2009 Free Software Foundation, Inc.
+# Copyright (C) 1991-2006,2007,2008,2009,2010 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
@@ -109,6 +109,18 @@ $(common-objpfx)%.latest: $(common-objpfx)abi-versions.h
 endif # avoid-generated
 endif # $(versioning) = yes
 
+ifndef avoid-generated
+before-compile := $(common-objpfx)libc-abis.h $(before-compile)
+libc-abis := $(firstword $(wildcard $(foreach D,$(add-ons), $(..)libc-abis)) \
+			 libc-abis)
+$(common-objpfx)libc-abis.h: $(..)scripts/gen-libc-abis $(libc-abis)
+	$(SHELL) $(..)scripts/gen-libc-abis \
+		 $(base-machine)-$(config-vendor)-$(config-os) \
+		 < $(libc-abis) > $@T
+	$(move-if-change) $@T $@
+common-generated += $(common-objpfx)libc-abis.h
+endif # avoid-generated
+
 # Make sure the subdirectory for object files gets created.
 ifdef objpfx
 ifeq (,$(wildcard $(objpfx).))
@@ -1395,7 +1407,7 @@ $(objpfx)stubs: $(objs-for-stubs)
 ifneq (,$(strip $(objs-for-stubs)))
 	(cd $(objpfx).; $(OBJDUMP) -h $(patsubst $(objpfx)%,%,$^)) | \
 	$(AWK) '/\.gnu\.glibc-stub\./ { \
-	          sub(/\.gnu\.glibc-stub\./, "", $$2); \
+		  sub(/\.gnu\.glibc-stub\./, "", $$2); \
 		  stubs[$$2] = 1; } \
 		END { for (s in stubs) print "#define __stub_" s }' > $@T
 	mv -f $@T $@

csu/version.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2008, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2008, 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
@@ -18,6 +18,7 @@
 
 #include "version.h"
 #include <tls.h>
+#include <libc-abis.h>
 #include <gnu/libc-version.h>
 
 static const char __libc_release[] = RELEASE;
@@ -25,12 +26,15 @@ static const char __libc_version[] = VERSION;
 
 static const char banner[] =
 "GNU C Library "RELEASE" release version "VERSION", by Roland McGrath et al.\n\
-Copyright (C) 2009 Free Software Foundation, Inc.\n\
+Copyright (C) 2010 Free Software Foundation, Inc.\n\
 This is free software; see the source for copying conditions.\n\
 There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n\
 PARTICULAR PURPOSE.\n\
 Compiled by GNU CC version "__VERSION__".\n"
 #include "version-info.h"
+#ifdef LIBC_ABIS_STRING
+LIBC_ABIS_STRING
+#endif
 #ifdef GLIBC_OLDEST_ABI
 "The oldest ABI supported: " GLIBC_OLDEST_ABI ".\n"
 #endif

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 == 0)
+# define VALID_ELF_ABIVERSION(ver)	(ver < LIBC_ABI_MAX)
 #elif defined MORE_ELF_HEADER_DATA
   MORE_ELF_HEADER_DATA;
 #endif
@@ -1655,7 +1655,9 @@ 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_PAD), 0))
+						EI_ABIVERSION)
+			    || !VALID_ELF_ABIVERSION (ehdr->e_ident[EI_ABIVERSION]),
+			    0))
 	{
 	  /* Something is wrong.  */
 	  const Elf32_Word *magp = (const void *) ehdr->e_ident;