forked from luck/tmp_suning_uos_patched
ac7b34218a
now that toolchains long support PT_GNU_STACK marking and there's no need anymore to force modern programs into having all its user mappings executable instead of only the stack and the PROT_EXEC ones. Disable that automatic READ_IMPLIES_EXEC forcing on x86-64 and arm64. Add tables documenting how READ_IMPLIES_EXEC is handled on x86-64, arm and arm64. By Kees Cook. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAl7YFDIACgkQEsHwGGHe VUpnzxAAmXdODNOb1gGQvt+KJthkfkWh2A2R+tWxCRmFtjFTcS/eRxFfvGu2KmFY 2b2AcJzuJeGjs7WIvQU0pkR2p6STyzuSBBLj5J/OJR9FonQ4pPah38df4A0fOgI6 GJyJV9Ie7O2Ph1w2iLOeWBdmR90CnYuabxsfipgOL+sjHlEI0RqLSDgARRQsxTEj KM+JVAFD472KcUJnQKBVBOD1I1DOVBGu12r3y6chgsOtwshLNW/cO15cDgYrgnJZ OlR3EIUukCEEc1KQzUCihsypLuGfrmdq1MyPN8CME8gLfmOBsJyGRDhvmdbS+Wxh kAMYQ9BuNP/jMVtN950qV0qUtnZCeIPlj1sDb9STWz5fInLsXDSCS0eYi32yBFi+ 7yviVU95ml6Mda1Qd5axItTHFAjKIn0qfMZszkLOtUszIzNinCgH7t3ThoXeV223 BqrpntRwiGZVpXDdcp0QFYBsWSMchR47yuhL8pB4SWxQzgNzXqAEg2KFQU0XMDKp pdia9IzUozg/BrjG5cnRfZhq2lBra7fy3Dn6fw5+NR5vqhka0Wr8L6dyM1Rj74EU HPk5bRXgt0OIiIFPi4139ApY7k+8j2nbf12qUchue1ZVVKzbvK996FDXbrGgW3zD Wis1wglxB9urSUTmC1bMOeyOd+gebo3i/ACAjgSo+EbDN7qW0Qw= =2L7y -----END PGP SIGNATURE----- Merge tag 'core_core_updates_for_5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull READ_IMPLIES_EXEC changes from Borislav Petkov: "Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK now that toolchains long support PT_GNU_STACK marking and there's no need anymore to force modern programs into having all its user mappings executable instead of only the stack and the PROT_EXEC ones. Disable that automatic READ_IMPLIES_EXEC forcing on x86-64 and arm64. Add tables documenting how READ_IMPLIES_EXEC is handled on x86-64, arm and arm64. By Kees Cook" * tag 'core_core_updates_for_5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: arm64/elf: Disable automatic READ_IMPLIES_EXEC for 64-bit address spaces arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK arm32/64/elf: Add tables to document READ_IMPLIES_EXEC x86/elf: Disable automatic READ_IMPLIES_EXEC on 64-bit x86/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK x86/elf: Add table to document READ_IMPLIES_EXEC
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 32-bit compatibility support for ELF format executables and core dumps.
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* Red Hat Author: Roland McGrath.
|
|
*
|
|
* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
|
|
* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
|
|
* used below, with definitions appropriate for 32-bit ABI compatibility.
|
|
*
|
|
* We use macros to rename the ABI types and machine-dependent
|
|
* functions used in binfmt_elf.c to compat versions.
|
|
*/
|
|
|
|
#include <linux/elfcore-compat.h>
|
|
#include <linux/time.h>
|
|
|
|
#define ELF_COMPAT 1
|
|
|
|
/*
|
|
* Rename the basic ELF layout types to refer to the 32-bit class of files.
|
|
*/
|
|
#undef ELF_CLASS
|
|
#define ELF_CLASS ELFCLASS32
|
|
|
|
#undef elfhdr
|
|
#undef elf_phdr
|
|
#undef elf_shdr
|
|
#undef elf_note
|
|
#undef elf_addr_t
|
|
#undef ELF_GNU_PROPERTY_ALIGN
|
|
#define elfhdr elf32_hdr
|
|
#define elf_phdr elf32_phdr
|
|
#define elf_shdr elf32_shdr
|
|
#define elf_note elf32_note
|
|
#define elf_addr_t Elf32_Addr
|
|
#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
|
|
|
|
/*
|
|
* Some data types as stored in coredump.
|
|
*/
|
|
#define user_long_t compat_long_t
|
|
#define user_siginfo_t compat_siginfo_t
|
|
#define copy_siginfo_to_external copy_siginfo_to_external32
|
|
|
|
/*
|
|
* The machine-dependent core note format types are defined in elfcore-compat.h,
|
|
* which requires asm/elf.h to define compat_elf_gregset_t et al.
|
|
*/
|
|
#define elf_prstatus compat_elf_prstatus
|
|
#define elf_prpsinfo compat_elf_prpsinfo
|
|
|
|
#undef ns_to_kernel_old_timeval
|
|
#define ns_to_kernel_old_timeval ns_to_old_timeval32
|
|
|
|
/*
|
|
* To use this file, asm/elf.h must define compat_elf_check_arch.
|
|
* The other following macros can be defined if the compat versions
|
|
* differ from the native ones, or omitted when they match.
|
|
*/
|
|
|
|
#undef ELF_ARCH
|
|
#undef elf_check_arch
|
|
#define elf_check_arch compat_elf_check_arch
|
|
|
|
#ifdef COMPAT_ELF_PLATFORM
|
|
#undef ELF_PLATFORM
|
|
#define ELF_PLATFORM COMPAT_ELF_PLATFORM
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_HWCAP
|
|
#undef ELF_HWCAP
|
|
#define ELF_HWCAP COMPAT_ELF_HWCAP
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_HWCAP2
|
|
#undef ELF_HWCAP2
|
|
#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
|
|
#endif
|
|
|
|
#ifdef COMPAT_ARCH_DLINFO
|
|
#undef ARCH_DLINFO
|
|
#define ARCH_DLINFO COMPAT_ARCH_DLINFO
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_ET_DYN_BASE
|
|
#undef ELF_ET_DYN_BASE
|
|
#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_EXEC_PAGESIZE
|
|
#undef ELF_EXEC_PAGESIZE
|
|
#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
|
|
#endif
|
|
|
|
#ifdef COMPAT_ELF_PLAT_INIT
|
|
#undef ELF_PLAT_INIT
|
|
#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
|
|
#endif
|
|
|
|
#ifdef COMPAT_SET_PERSONALITY
|
|
#undef SET_PERSONALITY
|
|
#define SET_PERSONALITY COMPAT_SET_PERSONALITY
|
|
#endif
|
|
|
|
#ifdef compat_start_thread
|
|
#undef start_thread
|
|
#define start_thread compat_start_thread
|
|
#endif
|
|
|
|
#ifdef compat_arch_setup_additional_pages
|
|
#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
|
|
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
|
|
#undef arch_setup_additional_pages
|
|
#define arch_setup_additional_pages compat_arch_setup_additional_pages
|
|
#endif
|
|
|
|
#ifdef compat_elf_read_implies_exec
|
|
#undef elf_read_implies_exec
|
|
#define elf_read_implies_exec compat_elf_read_implies_exec
|
|
#endif
|
|
|
|
/*
|
|
* Rename a few of the symbols that binfmt_elf.c will define.
|
|
* These are all local so the names don't really matter, but it
|
|
* might make some debugging less confusing not to duplicate them.
|
|
*/
|
|
#define elf_format compat_elf_format
|
|
#define init_elf_binfmt init_compat_elf_binfmt
|
|
#define exit_elf_binfmt exit_compat_elf_binfmt
|
|
|
|
/*
|
|
* We share all the actual code with the native (64-bit) version.
|
|
*/
|
|
#include "binfmt_elf.c"
|