49ae4d4b11
Existing PRSTATUS note contains only si_signo, si_code, si_errno fields from the siginfo of the signal which caused core to be dumped. There are tools which try to analyze crashes for possible security implications, and they want to use, among other data, si_addr field from the SIGSEGV. This patch adds a new elf note, NT_SIGINFO, which contains the complete siginfo_t of the signal which killed the process. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/*
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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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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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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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/*
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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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#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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/*
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* Some data types as stored in coredump.
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*/
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#define user_siginfo_t compat_siginfo_t
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#define copy_siginfo_to_user copy_siginfo_to_user32
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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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/*
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* Compat version of cputime_to_compat_timeval, perhaps this
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* should be an inline in <linux/compat.h>.
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*/
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static void cputime_to_compat_timeval(const cputime_t cputime,
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struct compat_timeval *value)
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{
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struct timeval tv;
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cputime_to_timeval(cputime, &tv);
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value->tv_sec = tv.tv_sec;
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value->tv_usec = tv.tv_usec;
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}
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#undef cputime_to_timeval
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#define cputime_to_timeval cputime_to_compat_timeval
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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_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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/*
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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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