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Extended ELF ABI version handling only for Linux.

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If the OSABI is generic we should not allow the ABI version to be nonzero.
Move all the new functionality into Linux-specific files.
This commit is contained in:
Ulrich Drepper 2010-03-16 23:34:59 -07:00
parent 8ed9a2b18b
commit d8c47894ca
3 changed files with 20 additions and 7 deletions
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10
ChangeLog
View File

@ -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.

8
elf/dl-load.c
View File

@ -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. */

9
sysdeps/unix/sysv/linux/ldsodefs.h
View File

@ -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 */