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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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b00530b6de
Initial data segment is established (see initimg-solaris.c for rationale): - directly during client program image initialization, - or on demand when the executed program is the runtime linker itself, after it has loaded its target dynamic executable (see PRE(sys_mmapobj)), or when the first brk() syscall is made. More preparatory work for ldsoexec support. n-i-bz git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15583
606 lines
20 KiB
C
606 lines
20 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- User-mode execve() for ELF executables m_ume_elf.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2015 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#if defined(VGO_linux) || defined(VGO_solaris)
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#include "pub_core_basics.h"
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#include "pub_core_vki.h"
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#include "pub_core_aspacemgr.h" // various mapping fns
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#include "pub_core_debuglog.h"
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#include "pub_core_libcassert.h" // VG_(exit), vg_assert
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#include "pub_core_libcbase.h" // VG_(memcmp), etc
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#include "pub_core_libcprint.h"
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#include "pub_core_libcfile.h" // VG_(open) et al
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#include "pub_core_machine.h" // VG_ELF_CLASS (XXX: which should be moved)
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#include "pub_core_mallocfree.h" // VG_(malloc), VG_(free)
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#include "pub_core_syscall.h" // VG_(strerror)
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#include "pub_core_ume.h" // self
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#include "priv_ume.h"
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/* --- !!! --- EXTERNAL HEADERS start --- !!! --- */
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#if defined(VGO_linux)
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# define _GNU_SOURCE
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# define _FILE_OFFSET_BITS 64
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#endif
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/* This is for ELF types etc, and also the AT_ constants. */
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#include <elf.h>
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#if defined(VGO_solaris)
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# include <sys/fasttrap.h> // PT_SUNWDTRACE_SIZE
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#endif
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/* --- !!! --- EXTERNAL HEADERS end --- !!! --- */
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#if VG_WORDSIZE == 8
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#define ESZ(x) Elf64_##x
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#elif VG_WORDSIZE == 4
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#define ESZ(x) Elf32_##x
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#else
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#error VG_WORDSIZE needs to ==4 or ==8
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#endif
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struct elfinfo
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{
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ESZ(Ehdr) e;
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ESZ(Phdr) *p;
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Int fd;
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};
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static void check_mmap(SysRes res, Addr base, SizeT len)
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{
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if (sr_isError(res)) {
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VG_(printf)("valgrind: mmap(0x%llx, %lld) failed in UME "
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"with error %lu (%s).\n",
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(ULong)base, (Long)len,
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sr_Err(res), VG_(strerror)(sr_Err(res)) );
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if (sr_Err(res) == VKI_EINVAL) {
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VG_(printf)("valgrind: this can be caused by executables with "
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"very large text, data or bss segments.\n");
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}
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VG_(exit)(1);
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}
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}
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/*------------------------------------------------------------*/
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/*--- Loading ELF files ---*/
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/*------------------------------------------------------------*/
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static
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struct elfinfo *readelf(Int fd, const HChar *filename)
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{
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SysRes sres;
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struct elfinfo *e = VG_(malloc)("ume.re.1", sizeof(*e));
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Int phsz;
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e->fd = fd;
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sres = VG_(pread)(fd, &e->e, sizeof(e->e), 0);
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if (sr_isError(sres) || sr_Res(sres) != sizeof(e->e)) {
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VG_(printf)("valgrind: %s: can't read ELF header: %s\n",
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filename, VG_(strerror)(sr_Err(sres)));
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goto bad;
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}
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if (VG_(memcmp)(&e->e.e_ident[0], ELFMAG, SELFMAG) != 0) {
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VG_(printf)("valgrind: %s: bad ELF magic number\n", filename);
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goto bad;
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}
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if (e->e.e_ident[EI_CLASS] != VG_ELF_CLASS) {
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VG_(printf)("valgrind: wrong ELF executable class "
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"(eg. 32-bit instead of 64-bit)\n");
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goto bad;
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}
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if (e->e.e_ident[EI_DATA] != VG_ELF_DATA2XXX) {
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VG_(printf)("valgrind: executable has wrong endian-ness\n");
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goto bad;
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}
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if (!(e->e.e_type == ET_EXEC || e->e.e_type == ET_DYN)) {
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VG_(printf)("valgrind: this is not an executable\n");
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goto bad;
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}
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if (e->e.e_machine != VG_ELF_MACHINE) {
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VG_(printf)("valgrind: executable is not for "
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"this architecture\n");
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goto bad;
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}
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if (e->e.e_phentsize != sizeof(ESZ(Phdr))) {
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VG_(printf)("valgrind: sizeof ELF Phdr wrong\n");
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goto bad;
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}
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phsz = sizeof(ESZ(Phdr)) * e->e.e_phnum;
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e->p = VG_(malloc)("ume.re.2", phsz);
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sres = VG_(pread)(fd, e->p, phsz, e->e.e_phoff);
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if (sr_isError(sres) || sr_Res(sres) != phsz) {
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VG_(printf)("valgrind: can't read phdr: %s\n",
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VG_(strerror)(sr_Err(sres)));
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VG_(free)(e->p);
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goto bad;
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}
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return e;
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bad:
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VG_(free)(e);
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return NULL;
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}
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/* Map an ELF file. Returns the brk address. */
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static
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ESZ(Addr) mapelf(struct elfinfo *e, ESZ(Addr) base)
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{
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Int i;
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SysRes res;
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ESZ(Addr) elfbrk = 0;
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for (i = 0; i < e->e.e_phnum; i++) {
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ESZ(Phdr) *ph = &e->p[i];
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ESZ(Addr) addr, brkaddr;
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ESZ(Word) memsz;
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if (ph->p_type != PT_LOAD)
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continue;
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addr = ph->p_vaddr+base;
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memsz = ph->p_memsz;
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brkaddr = addr+memsz;
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if (brkaddr > elfbrk)
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elfbrk = brkaddr;
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}
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for (i = 0; i < e->e.e_phnum; i++) {
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ESZ(Phdr) *ph = &e->p[i];
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ESZ(Addr) addr, bss, brkaddr;
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ESZ(Off) off;
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ESZ(Word) filesz;
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ESZ(Word) memsz;
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unsigned prot = 0;
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if (ph->p_type != PT_LOAD)
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continue;
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if (ph->p_flags & PF_X) prot |= VKI_PROT_EXEC;
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if (ph->p_flags & PF_W) prot |= VKI_PROT_WRITE;
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if (ph->p_flags & PF_R) prot |= VKI_PROT_READ;
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addr = ph->p_vaddr+base;
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off = ph->p_offset;
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filesz = ph->p_filesz;
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bss = addr+filesz;
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memsz = ph->p_memsz;
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brkaddr = addr+memsz;
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// Tom says: In the following, do what the Linux kernel does and only
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// map the pages that are required instead of rounding everything to
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// the specified alignment (ph->p_align). (AMD64 doesn't work if you
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// use ph->p_align -- part of stage2's memory gets trashed somehow.)
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//
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// The condition handles the case of a zero-length segment.
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if (VG_PGROUNDUP(bss)-VG_PGROUNDDN(addr) > 0) {
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if (0) VG_(debugLog)(0,"ume","mmap_file_fixed_client #1\n");
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res = VG_(am_mmap_file_fixed_client)(
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VG_PGROUNDDN(addr),
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VG_PGROUNDUP(bss)-VG_PGROUNDDN(addr),
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prot, /*VKI_MAP_FIXED|VKI_MAP_PRIVATE, */
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e->fd, VG_PGROUNDDN(off)
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);
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if (0) VG_(am_show_nsegments)(0,"after #1");
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check_mmap(res, VG_PGROUNDDN(addr),
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VG_PGROUNDUP(bss)-VG_PGROUNDDN(addr));
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}
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// if memsz > filesz, fill the remainder with zeroed pages
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if (memsz > filesz) {
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UInt bytes;
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bytes = VG_PGROUNDUP(brkaddr)-VG_PGROUNDUP(bss);
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if (bytes > 0) {
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if (0) VG_(debugLog)(0,"ume","mmap_anon_fixed_client #2\n");
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res = VG_(am_mmap_anon_fixed_client)(
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VG_PGROUNDUP(bss), bytes,
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prot
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);
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if (0) VG_(am_show_nsegments)(0,"after #2");
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check_mmap(res, VG_PGROUNDUP(bss), bytes);
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}
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bytes = bss & (VKI_PAGE_SIZE - 1);
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// The 'prot' condition allows for a read-only bss
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if ((prot & VKI_PROT_WRITE) && (bytes > 0)) {
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bytes = VKI_PAGE_SIZE - bytes;
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VG_(memset)((void *)bss, 0, bytes);
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}
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}
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}
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return elfbrk;
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}
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Bool VG_(match_ELF)(const void *hdr, SizeT len)
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{
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const ESZ(Ehdr) *e = hdr;
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return (len > sizeof(*e)) && VG_(memcmp)(&e->e_ident[0], ELFMAG, SELFMAG) == 0;
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}
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/* load_ELF pulls an ELF executable into the address space, prepares
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it for execution, and writes info about it into INFO. In
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particular it fills in .init_eip, which is the starting point.
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Returns zero on success, non-zero (a VKI_E.. value) on failure.
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The sequence of activities is roughly as follows:
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- use readelf() to extract program header info from the exe file.
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- scan the program header, collecting info (not sure what all those
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info-> fields are, or whether they are used, but still) and in
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particular looking out fo the PT_INTERP header, which describes
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the interpreter. If such a field is found, the space needed to
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hold the interpreter is computed into interp_size.
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- map the executable in, by calling mapelf(). This maps in all
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loadable sections, and I _think_ also creates any .bss areas
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required. mapelf() returns the address just beyond the end of
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the furthest-along mapping it creates. The executable is mapped
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starting at EBASE, which is usually read from it (eg, 0x8048000
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etc) except if it's a PIE, in which case I'm not sure what
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happens.
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The returned address is recorded in info->brkbase as the start
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point of the brk (data) segment, as it is traditional to place
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the data segment just after the executable. Neither load_ELF nor
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mapelf creates the brk segment, though: that is for the caller of
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load_ELF to attend to.
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- If the initial phdr scan didn't find any mention of an
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interpreter (interp == NULL), this must be a statically linked
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executable, and we're pretty much done.
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- Otherwise, we need to use mapelf() a second time to load the
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interpreter. The interpreter can go anywhere, but mapelf() wants
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to be told a specific address to put it at. So an advisory query
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is passed to aspacem, asking where it would put an anonymous
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client mapping of size INTERP_SIZE. That address is then used
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as the mapping address for the interpreter.
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- The entry point in INFO is set to the interpreter's entry point,
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and we're done. */
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Int VG_(load_ELF)(Int fd, const HChar* name, /*MOD*/ExeInfo* info)
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{
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SysRes sres;
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struct elfinfo *e;
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struct elfinfo *interp = NULL;
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ESZ(Addr) minaddr = ~0; /* lowest mapped address */
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ESZ(Addr) maxaddr = 0; /* highest mapped address */
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ESZ(Addr) interp_addr = 0; /* interpreter (ld.so) address */
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ESZ(Word) interp_size = 0; /* interpreter size */
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/* ESZ(Word) interp_align = VKI_PAGE_SIZE; */ /* UNUSED */
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Int i;
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void *entry;
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ESZ(Addr) ebase = 0;
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# if defined(VGO_solaris)
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ESZ(Addr) thrptr_addr = 0;
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# endif
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# if defined(HAVE_PIE)
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ebase = info->exe_base;
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# endif
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e = readelf(fd, name);
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if (e == NULL)
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return VKI_ENOEXEC;
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/* The kernel maps position-independent executables at TASK_SIZE*2/3;
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duplicate this behavior as close as we can. */
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if (e->e.e_type == ET_DYN && ebase == 0) {
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ebase = VG_PGROUNDDN(info->exe_base
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+ (info->exe_end - info->exe_base) * 2 / 3);
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/* We really don't want to load PIEs at zero or too close. It
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works, but it's unrobust (NULL pointer reads and writes
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become legit, which is really bad) and causes problems for
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exp-ptrcheck, which assumes all numbers below 1MB are
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nonpointers. So, hackily, move it above 1MB. */
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/* Later .. it appears ppc32-linux tries to put [vdso] at 1MB,
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which totally screws things up, because nothing else can go
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there. The size of [vdso] is around 2 or 3 pages, so bump
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the hacky load addess along by 8 * VKI_PAGE_SIZE to be safe. */
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/* Later .. on mips64 we can't use 0x108000, because mapelf will
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fail. */
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# if defined(VGP_mips64_linux)
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if (ebase < 0x100000)
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ebase = 0x100000;
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# else
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vg_assert(VKI_PAGE_SIZE >= 4096); /* stay sane */
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ESZ(Addr) hacky_load_address = 0x100000 + 8 * VKI_PAGE_SIZE;
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if (ebase < hacky_load_address)
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ebase = hacky_load_address;
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# endif
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# if defined(VGO_solaris)
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/* Record for later use in AT_BASE. */
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info->interp_offset = ebase;
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# endif
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}
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info->phnum = e->e.e_phnum;
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info->entry = e->e.e_entry + ebase;
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info->phdr = 0;
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info->stack_prot = VKI_PROT_READ|VKI_PROT_WRITE|VKI_PROT_EXEC;
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for (i = 0; i < e->e.e_phnum; i++) {
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ESZ(Phdr) *ph = &e->p[i];
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switch(ph->p_type) {
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case PT_PHDR:
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info->phdr = ph->p_vaddr + ebase;
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# if defined(VGO_solaris)
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info->real_phdr_present = True;
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# endif
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break;
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case PT_LOAD:
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if (ph->p_vaddr < minaddr)
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minaddr = ph->p_vaddr;
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if (ph->p_vaddr+ph->p_memsz > maxaddr)
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maxaddr = ph->p_vaddr+ph->p_memsz;
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break;
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# if defined(VGO_solaris)
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case PT_SUNWDTRACE:
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if (ph->p_memsz < PT_SUNWDTRACE_SIZE ||
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(ph->p_flags & (PF_R | PF_W | PF_X)) != (PF_R | PF_W | PF_X)) {
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VG_(printf)("valgrind: m_ume.c: too small SUNWDTRACE size\n");
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return VKI_ENOEXEC;
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}
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info->init_thrptr = ph->p_vaddr + ebase;
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break;
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# endif
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case PT_INTERP: {
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HChar *buf = VG_(malloc)("ume.LE.1", ph->p_filesz+1);
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Int j;
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Int intfd;
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Int baseaddr_set;
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VG_(pread)(fd, buf, ph->p_filesz, ph->p_offset);
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buf[ph->p_filesz] = '\0';
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sres = VG_(open)(buf, VKI_O_RDONLY, 0);
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if (sr_isError(sres)) {
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VG_(printf)("valgrind: m_ume.c: can't open interpreter\n");
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VG_(exit)(1);
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}
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intfd = sr_Res(sres);
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interp = readelf(intfd, buf);
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if (interp == NULL) {
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VG_(printf)("valgrind: m_ume.c: can't read interpreter\n");
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return 1;
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}
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VG_(free)(buf);
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baseaddr_set = 0;
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for (j = 0; j < interp->e.e_phnum; j++) {
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ESZ(Phdr) *iph = &interp->p[j];
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ESZ(Addr) end;
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# if defined(VGO_solaris)
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if (iph->p_type == PT_SUNWDTRACE) {
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if (iph->p_memsz < PT_SUNWDTRACE_SIZE ||
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(iph->p_flags & (PF_R | PF_W | PF_X))
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!= (PF_R | PF_W | PF_X)) {
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VG_(printf)("valgrind: m_ume.c: too small SUNWDTRACE size\n");
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return VKI_ENOEXEC;
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}
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/* Store the thrptr value into a temporary because we do not
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know yet where the interpreter is mapped. */
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thrptr_addr = iph->p_vaddr;
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}
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# endif
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if (iph->p_type != PT_LOAD || iph->p_memsz == 0)
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continue;
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if (!baseaddr_set) {
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interp_addr = iph->p_vaddr;
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/* interp_align = iph->p_align; */ /* UNUSED */
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baseaddr_set = 1;
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}
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/* assumes that all segments in the interp are close */
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end = (iph->p_vaddr - interp_addr) + iph->p_memsz;
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if (end > interp_size)
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interp_size = end;
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}
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break;
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}
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# if defined(PT_GNU_STACK) || defined(PT_SUNWSTACK)
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# if defined(PT_GNU_STACK)
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/* Android's elf.h doesn't appear to have PT_GNU_STACK. */
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case PT_GNU_STACK:
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# endif
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# if defined(PT_SUNWSTACK)
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/* Solaris-specific program header. */
|
|
case PT_SUNWSTACK:
|
|
# endif
|
|
if ((ph->p_flags & PF_X) == 0) info->stack_prot &= ~VKI_PROT_EXEC;
|
|
if ((ph->p_flags & PF_W) == 0) info->stack_prot &= ~VKI_PROT_WRITE;
|
|
if ((ph->p_flags & PF_R) == 0) info->stack_prot &= ~VKI_PROT_READ;
|
|
break;
|
|
# endif
|
|
|
|
# if defined(PT_SUNW_SYSSTAT)
|
|
/* Solaris-specific program header which requires link-time support. */
|
|
case PT_SUNW_SYSSTAT:
|
|
VG_(unimplemented)("Support for program header PT_SUNW_SYSSTAT.");
|
|
break;
|
|
# endif
|
|
# if defined(PT_SUNW_SYSSTAT_ZONE)
|
|
/* Solaris-specific program header which requires link-time support. */
|
|
case PT_SUNW_SYSSTAT_ZONE:
|
|
VG_(unimplemented)("Support for program header PT_SUNW_SYSSTAT_ZONE.");
|
|
break;
|
|
# endif
|
|
|
|
default:
|
|
// do nothing
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (info->phdr == 0)
|
|
info->phdr = minaddr + ebase + e->e.e_phoff;
|
|
|
|
if (info->exe_base != info->exe_end) {
|
|
if (minaddr >= maxaddr ||
|
|
(minaddr + ebase < info->exe_base ||
|
|
maxaddr + ebase > info->exe_end)) {
|
|
VG_(printf)("Executable range %p-%p is outside the\n"
|
|
"acceptable range %p-%p\n",
|
|
(char *)minaddr + ebase, (char *)maxaddr + ebase,
|
|
(char *)info->exe_base, (char *)info->exe_end);
|
|
return VKI_ENOMEM;
|
|
}
|
|
}
|
|
|
|
info->brkbase = mapelf(e, ebase); /* map the executable */
|
|
|
|
if (info->brkbase == 0)
|
|
return VKI_ENOMEM;
|
|
|
|
if (interp != NULL) {
|
|
/* reserve a chunk of address space for interpreter */
|
|
MapRequest mreq;
|
|
Addr advised;
|
|
Bool ok;
|
|
|
|
/* Don't actually reserve the space. Just get an advisory
|
|
indicating where it would be allocated, and pass that to
|
|
mapelf(), which in turn asks aspacem to do some fixed maps at
|
|
the specified address. This is a bit of hack, but it should
|
|
work because there should be no intervening transactions with
|
|
aspacem which could cause those fixed maps to fail.
|
|
|
|
Placement policy is:
|
|
|
|
if the interpreter asks to be loaded at zero
|
|
ignore that and put it wherever we like (mappings at zero
|
|
are bad news)
|
|
else
|
|
try and put it where it asks for, but if that doesn't work,
|
|
just put it anywhere.
|
|
*/
|
|
if (interp_addr == 0) {
|
|
mreq.rkind = MAny;
|
|
mreq.start = 0;
|
|
mreq.len = interp_size;
|
|
} else {
|
|
mreq.rkind = MHint;
|
|
mreq.start = interp_addr;
|
|
mreq.len = interp_size;
|
|
}
|
|
|
|
advised = VG_(am_get_advisory)( &mreq, True/*client*/, &ok );
|
|
|
|
if (!ok) {
|
|
/* bomb out */
|
|
SysRes res = VG_(mk_SysRes_Error)(VKI_EINVAL);
|
|
if (0) VG_(printf)("reserve for interp: failed\n");
|
|
check_mmap(res, (Addr)interp_addr, interp_size);
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
(void)mapelf(interp, (ESZ(Addr))advised - interp_addr);
|
|
|
|
VG_(close)(interp->fd);
|
|
|
|
entry = (void *)(advised - interp_addr + interp->e.e_entry);
|
|
|
|
info->interp_offset = advised - interp_addr;
|
|
# if defined(VGO_solaris)
|
|
if (thrptr_addr)
|
|
info->init_thrptr = thrptr_addr + info->interp_offset;
|
|
# endif
|
|
|
|
VG_(free)(interp->p);
|
|
VG_(free)(interp);
|
|
} else {
|
|
entry = (void *)(ebase + e->e.e_entry);
|
|
|
|
# if defined(VGO_solaris)
|
|
if (e->e.e_type == ET_DYN)
|
|
info->ldsoexec = True;
|
|
# endif
|
|
}
|
|
|
|
info->exe_base = minaddr + ebase;
|
|
info->exe_end = maxaddr + ebase;
|
|
|
|
#if defined(VGP_ppc64be_linux)
|
|
/* On PPC64BE, ELF ver 1, a func ptr is represented by a TOC entry ptr.
|
|
This TOC entry contains three words; the first word is the function
|
|
address, the second word is the TOC ptr (r2), and the third word
|
|
is the static chain value. */
|
|
info->init_ip = ((ULong*)entry)[0];
|
|
info->init_toc = ((ULong*)entry)[1];
|
|
info->init_ip += info->interp_offset;
|
|
info->init_toc += info->interp_offset;
|
|
#elif defined(VGP_ppc64le_linux)
|
|
/* On PPC64LE, ELF ver 2. API doesn't use a func ptr */
|
|
info->init_ip = (Addr)entry;
|
|
info->init_toc = 0; /* meaningless on this platform */
|
|
#else
|
|
info->init_ip = (Addr)entry;
|
|
info->init_toc = 0; /* meaningless on this platform */
|
|
#endif
|
|
VG_(free)(e->p);
|
|
VG_(free)(e);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif // defined(VGO_linux) || defined(VGO_solaris)
|
|
|
|
/*--------------------------------------------------------------------*/
|
|
/*--- end ---*/
|
|
/*--------------------------------------------------------------------*/
|