mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-16 15:44:56 +00:00
0dc5853b9e
glibc added some security hardening adding (optimized) index/strchr
calls in the LD_PRELOAD path:
commit 6d0ba622891bed9d8394eef1935add53003b12e8
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon Jun 19 22:31:04 2017 +0200
ld.so: Reject overly long LD_PRELOAD path elements
arm32 doesn't have an ld.so hardwire for index/strchr like other
architectures and so will always complain during early startup:
==9495== Conditional jump or move depends on uninitialised value(s)
==9495== at 0x401CF84: index (in /usr/lib/ld-2.25.so)
==9495==
==9495== Conditional jump or move depends on uninitialised value(s)
==9495== at 0x401CF88: index (in /usr/lib/ld-2.25.so)
index/strchr is doing a word load from a partially-written
stack-allocated buffer, therefore accessing uninitialized data.
This is normal for an optimized string function. The uninitialized
data does not affect the function result.
This can be suppressed by adding a index hardwire for ld.so on arm32
like on other arches. There even was already some commented out code
to do that. Enable that code.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@16458
181 lines
7.6 KiB
C
181 lines
7.6 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- The trampoline code page. pub_core_trampoline.h ---*/
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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) 2000-2017 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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#ifndef __PUB_CORE_TRAMPOLINE_H
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#define __PUB_CORE_TRAMPOLINE_H
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#include "pub_core_basics.h" // VG_ macro
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//--------------------------------------------------------------------
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// PURPOSE: This module defines a few replacement functions for Linux
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// vsyscalls, which we can't implement directly. It also contains
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// stubs for signal returns. Note, all the code within runs on the
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// simulated CPU. The vsyscall stubs are gotten to by use of the
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// redirect mechanism.
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//
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// Note: generally, putting replacement functions in here is a bad
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// idea, since any Dwarf frame-unwind info attached to them will not
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// be seen by the unwinder in gcc's runtime support. This means
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// unwinding during exception handling by gcc tends to fail if it
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// encounters one of these replacement functions. A better place to
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// put them is in one of the .so's preloaded into the client, since
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// the client's ld.so will know about it and so gcc's unwinder
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// (somehow) is able to get hold of it.
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//--------------------------------------------------------------------
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/* These two delimit our handwritten assembly code, so we can tell
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tools which track memory that this area should be regarded as
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readable, at least. Otherwise Memcheck complains we're jumping to
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invalid addresses. */
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extern Addr VG_(trampoline_stuff_start);
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extern Addr VG_(trampoline_stuff_end);
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#if defined(VGP_x86_linux)
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extern Addr VG_(x86_linux_SUBST_FOR_sigreturn);
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extern Addr VG_(x86_linux_SUBST_FOR_rt_sigreturn);
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extern Char* VG_(x86_linux_REDIR_FOR_index) ( const Char*, Int );
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extern UInt VG_(x86_linux_REDIR_FOR_strlen)( void* );
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#endif
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#if defined(VGP_amd64_linux)
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extern Addr VG_(amd64_linux_SUBST_FOR_rt_sigreturn);
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extern Addr VG_(amd64_linux_REDIR_FOR_vgettimeofday);
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extern Addr VG_(amd64_linux_REDIR_FOR_vtime);
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extern Addr VG_(amd64_linux_REDIR_FOR_vgetcpu);
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extern UInt VG_(amd64_linux_REDIR_FOR_strlen)( void* );
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extern Char* VG_(amd64_linux_REDIR_FOR_index) ( const Char*, Int );
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#endif
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#if defined(VGP_ppc32_linux)
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extern Addr VG_(ppc32_linux_SUBST_FOR_sigreturn);
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extern Addr VG_(ppc32_linux_SUBST_FOR_rt_sigreturn);
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extern UInt VG_(ppc32_linux_REDIR_FOR_strlen)( void* );
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extern UInt VG_(ppc32_linux_REDIR_FOR_strcmp)( void*, void* );
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extern void* VG_(ppc32_linux_REDIR_FOR_strchr)( void*, Int );
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#endif
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#if defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
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extern Addr VG_(ppc64_linux_SUBST_FOR_rt_sigreturn);
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extern UInt VG_(ppc64_linux_REDIR_FOR_strlen)( void* );
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extern void* VG_(ppc64_linux_REDIR_FOR_strchr)( void*, Int );
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/* A label (sans dot) marking the ultra-magical return stub via which
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all redirected and wrapped functions are made to "return" on
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ppc64-linux. The one insn at this label is never really
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translated. Instead, m_translate generates IR to restore the
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thread's LR and R2 registers from a small stack in the ppc64 guest
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state structure, and then branch to LR. Convoluted? Confusing?
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You betcha. Could I think of anything simpler? No. */
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extern Addr VG_(ppctoc_magic_redirect_return_stub);
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#endif
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#if defined(VGP_arm_linux)
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extern Addr VG_(arm_linux_SUBST_FOR_sigreturn);
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extern Addr VG_(arm_linux_SUBST_FOR_rt_sigreturn);
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extern UInt VG_(arm_linux_REDIR_FOR_strlen)( void* );
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extern void* VG_(arm_linux_REDIR_FOR_index) ( void*, Int );
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extern void* VG_(arm_linux_REDIR_FOR_memcpy)( void*, void*, Int );
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extern void* VG_(arm_linux_REDIR_FOR_strcmp)( void*, void* );
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#endif
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#if defined(VGP_arm64_linux)
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extern Addr VG_(arm64_linux_SUBST_FOR_rt_sigreturn);
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extern ULong VG_(arm64_linux_REDIR_FOR_strlen)( void* );
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extern void* VG_(arm64_linux_REDIR_FOR_index) ( void*, Long );
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extern Long VG_(arm64_linux_REDIR_FOR_strcmp)( void*, void* );
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#endif
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#if defined(VGP_x86_darwin)
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extern Addr VG_(x86_darwin_SUBST_FOR_sigreturn);
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extern SizeT VG_(x86_darwin_REDIR_FOR_strlen)( void* );
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extern SizeT VG_(x86_darwin_REDIR_FOR_strcmp)( void*, void* );
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extern void* VG_(x86_darwin_REDIR_FOR_strcat)( void*, void * );
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extern char* VG_(x86_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
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extern SizeT VG_(x86_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
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SizeT size );
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#endif
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#if defined(VGP_amd64_darwin)
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extern Addr VG_(amd64_darwin_SUBST_FOR_sigreturn);
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extern SizeT VG_(amd64_darwin_REDIR_FOR_strlen)( void* );
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extern SizeT VG_(amd64_darwin_REDIR_FOR_strcmp)( void*, void* );
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extern void* VG_(amd64_darwin_REDIR_FOR_strcat)( void*, void * );
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extern char* VG_(amd64_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
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extern SizeT VG_(amd64_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
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SizeT size );
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extern UInt VG_(amd64_darwin_REDIR_FOR_arc4random)( void );
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# if DARWIN_VERS == DARWIN_10_9
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extern char* VG_(amd64_darwin_REDIR_FOR_strchr)( const char*, int );
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# endif
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#endif
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#if defined(VGP_s390x_linux)
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extern Addr VG_(s390x_linux_SUBST_FOR_sigreturn);
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extern Addr VG_(s390x_linux_SUBST_FOR_rt_sigreturn);
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// Note: Long for the 2nd parameter because according to z-series ABI,
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// section "Parameter Passing" SIMPLE_ARG:
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// "Values shorter than 64 bits are sign- or zero-extended
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// (as appropriate) to 64 bits."
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extern void* VG_(s390x_linux_REDIR_FOR_index) ( void*, Long );
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#endif
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#if defined(VGP_mips32_linux)
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extern Addr VG_(mips32_linux_SUBST_FOR_sigreturn);
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extern Addr VG_(mips32_linux_SUBST_FOR_rt_sigreturn);
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extern Char* VG_(mips32_linux_REDIR_FOR_index)( const Char*, Int );
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extern UInt VG_(mips32_linux_REDIR_FOR_strlen)( void* );
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#endif
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#if defined(VGP_mips64_linux)
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extern Addr VG_(mips64_linux_SUBST_FOR_rt_sigreturn);
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extern Char* VG_(mips64_linux_REDIR_FOR_index)( const Char*, Int );
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extern UInt VG_(mips64_linux_REDIR_FOR_strlen)( void* );
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#endif
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#if defined(VGP_x86_solaris)
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extern SizeT VG_(x86_solaris_REDIR_FOR_strcmp)(const HChar *, const HChar *);
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extern SizeT VG_(x86_solaris_REDIR_FOR_strlen)(const HChar *);
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#endif
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#if defined(VGP_amd64_solaris)
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extern HChar *VG_(amd64_solaris_REDIR_FOR_strcpy)(HChar *, const HChar *);
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extern HChar *VG_(amd64_solaris_REDIR_FOR_strncpy)(HChar *, const HChar *,
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SizeT);
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extern Int VG_(amd64_solaris_REDIR_FOR_strcmp)(const HChar *, const HChar *);
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extern HChar *VG_(amd64_solaris_REDIR_FOR_strcat)(HChar *, const HChar *);
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extern SizeT VG_(amd64_solaris_REDIR_FOR_strlen)(const HChar *);
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#endif
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#endif // __PUB_CORE_TRAMPOLINE_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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