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9a29a67190
Like it is done for SET_PERSONALITY with ARM, which requires the ELF header to select correct personality parameters, x86 requires the headers when selecting which VDSO to load, instead of relying on the going-away TIF_IA32/X32 flags. Add an indirection macro to arch_setup_additional_pages(), that x86 can reimplement to receive the extra parameter just for ELF files. This requires no changes to other architectures, who can continue to use the original arch_setup_additional_pages for ELF and non-ELF binaries. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20201004032536.1229030-8-krisman@collabora.com
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* 32-bit compatibility support for ELF format executables and core dumps.
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*
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* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
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*
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* Red Hat Author: Roland McGrath.
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*
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* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
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* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
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* used below, with definitions appropriate for 32-bit ABI compatibility.
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*
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* We use macros to rename the ABI types and machine-dependent
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* functions used in binfmt_elf.c to compat versions.
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*/
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#include <linux/elfcore-compat.h>
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#include <linux/time.h>
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#define ELF_COMPAT 1
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/*
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* Rename the basic ELF layout types to refer to the 32-bit class of files.
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*/
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#undef ELF_CLASS
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#define ELF_CLASS ELFCLASS32
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#undef elfhdr
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#undef elf_phdr
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#undef elf_shdr
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#undef elf_note
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#undef elf_addr_t
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#undef ELF_GNU_PROPERTY_ALIGN
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#define elfhdr elf32_hdr
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#define elf_phdr elf32_phdr
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#define elf_shdr elf32_shdr
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#define elf_note elf32_note
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#define elf_addr_t Elf32_Addr
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#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
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/*
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* Some data types as stored in coredump.
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*/
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#define user_long_t compat_long_t
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#define user_siginfo_t compat_siginfo_t
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#define copy_siginfo_to_external copy_siginfo_to_external32
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/*
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* The machine-dependent core note format types are defined in elfcore-compat.h,
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* which requires asm/elf.h to define compat_elf_gregset_t et al.
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*/
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#define elf_prstatus compat_elf_prstatus
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#define elf_prpsinfo compat_elf_prpsinfo
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#undef ns_to_kernel_old_timeval
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#define ns_to_kernel_old_timeval ns_to_old_timeval32
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/*
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* To use this file, asm/elf.h must define compat_elf_check_arch.
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* The other following macros can be defined if the compat versions
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* differ from the native ones, or omitted when they match.
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*/
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#undef ELF_ARCH
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#undef elf_check_arch
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#define elf_check_arch compat_elf_check_arch
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#ifdef COMPAT_ELF_PLATFORM
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#undef ELF_PLATFORM
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#define ELF_PLATFORM COMPAT_ELF_PLATFORM
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#endif
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#ifdef COMPAT_ELF_HWCAP
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#undef ELF_HWCAP
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#define ELF_HWCAP COMPAT_ELF_HWCAP
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#endif
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#ifdef COMPAT_ELF_HWCAP2
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#undef ELF_HWCAP2
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#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
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#endif
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#ifdef COMPAT_ARCH_DLINFO
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#undef ARCH_DLINFO
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#define ARCH_DLINFO COMPAT_ARCH_DLINFO
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#endif
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#ifdef COMPAT_ELF_ET_DYN_BASE
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#undef ELF_ET_DYN_BASE
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#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
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#endif
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#ifdef COMPAT_ELF_EXEC_PAGESIZE
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#undef ELF_EXEC_PAGESIZE
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#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
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#endif
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#ifdef COMPAT_ELF_PLAT_INIT
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#undef ELF_PLAT_INIT
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#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
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#endif
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#ifdef COMPAT_SET_PERSONALITY
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#undef SET_PERSONALITY
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#define SET_PERSONALITY COMPAT_SET_PERSONALITY
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#endif
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#ifdef compat_start_thread
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#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
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compat_start_thread(regs, new_ip, new_sp)
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#endif
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#ifdef COMPAT_START_THREAD
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#undef START_THREAD
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#define START_THREAD COMPAT_START_THREAD
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#endif
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#ifdef compat_arch_setup_additional_pages
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#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
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compat_arch_setup_additional_pages(bprm, interpreter)
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#endif
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#ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
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#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
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#undef ARCH_SETUP_ADDITIONAL_PAGES
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#define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
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#endif
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#ifdef compat_elf_read_implies_exec
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#undef elf_read_implies_exec
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#define elf_read_implies_exec compat_elf_read_implies_exec
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#endif
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/*
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* Rename a few of the symbols that binfmt_elf.c will define.
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* These are all local so the names don't really matter, but it
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* might make some debugging less confusing not to duplicate them.
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*/
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#define elf_format compat_elf_format
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#define init_elf_binfmt init_compat_elf_binfmt
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#define exit_elf_binfmt exit_compat_elf_binfmt
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/*
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* We share all the actual code with the native (64-bit) version.
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*/
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#include "binfmt_elf.c"
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