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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
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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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#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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#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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