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[libsanitizer] add mach_override and enable libsanitizer on darwin
From-SVN: r193781
This commit is contained in:
Jack Howarth
Kostya Serebryany
parent
9f1b2dcbad
commit
f246eadc0a
@ -1,3 +1,7 @@
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2012-11-24 Jack Howarth <howarth@bromo.med.uc.edu>
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* config/darwin.h (LINK_COMMAND_SPEC_A): Deal with -fsanitize=address.
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2012-11-24 Matthias Klose <doko@ubuntu.com>
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* configure.ac (multiarch): Use $enableval instead of $withval.
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@ -180,6 +180,9 @@ extern GTY(()) int darwin_ms_struct;
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%{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} \
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%{fopenmp|ftree-parallelize-loops=*: \
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%{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
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%{fsanitize=address: \
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%{static|static-libasan|static-libgcc|static-libgfortran: -framework CoreFoundation -lstdc++ libasan.a%s; \
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static-libstdc++: -framework CoreFoundation libstdc++.a%s libasan.a%s; : -framework CoreFoundation -lasan } } \
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%{fgnu-tm: \
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%{static|static-libgcc|static-libstdc++|static-libgfortran: libitm.a%s; : -litm } } \
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%{!nostdlib:%{!nodefaultlibs:\
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@ -1,3 +1,16 @@
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2012-11-24 Kostya Serebryany kcc@google.com
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Jack Howarth <howarth@bromo.med.uc.edu>
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* interception/mach_override/mach_override.c: Migrate from llvm.
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* interception/mach_override/mach_override.h: Likewise.
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* interception/mach_override/LICENSE.txt: Likewise.
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* configure.tgt: Add darwin to supported targets.
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* configure.ac: Define USING_MACH_OVERRIDE when on darwin.
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* interception/Makefile.am: Compile mach_override.c when
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USING_MACH_OVERRIDE defined.
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* configure: Regenerated.
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* interception/Makefile.in: Likewise.
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2012-11-23 H.J. Lu <hongjiu.lu@intel.com>
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PR sanitizer/55450
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23
libsanitizer/configure
vendored
23
libsanitizer/configure
vendored
@ -604,6 +604,8 @@ ac_subst_vars='am__EXEEXT_FALSE
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am__EXEEXT_TRUE
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LTLIBOBJS
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LIBOBJS
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USING_MACH_OVERRIDE_FALSE
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USING_MACH_OVERRIDE_TRUE
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TSAN_SUPPORTED_FALSE
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TSAN_SUPPORTED_TRUE
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enable_static
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@ -11078,7 +11080,7 @@ else
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lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
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lt_status=$lt_dlunknown
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cat > conftest.$ac_ext <<_LT_EOF
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#line 11081 "configure"
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#line 11083 "configure"
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#include "confdefs.h"
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#if HAVE_DLFCN_H
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@ -11184,7 +11186,7 @@ else
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lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
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lt_status=$lt_dlunknown
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cat > conftest.$ac_ext <<_LT_EOF
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#line 11187 "configure"
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#line 11189 "configure"
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#include "confdefs.h"
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#if HAVE_DLFCN_H
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@ -14494,6 +14496,19 @@ else
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fi
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case "$host" in
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*-*-darwin*) MACH_OVERRIDE=true ;;
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*) MACH_OVERRIDE=false ;;
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esac
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if $MACH_OVERRIDE; then
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USING_MACH_OVERRIDE_TRUE=
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USING_MACH_OVERRIDE_FALSE='#'
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else
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USING_MACH_OVERRIDE_TRUE='#'
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USING_MACH_OVERRIDE_FALSE=
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fi
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ac_config_files="$ac_config_files Makefile"
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@ -14670,6 +14685,10 @@ if test -z "${TSAN_SUPPORTED_TRUE}" && test -z "${TSAN_SUPPORTED_FALSE}"; then
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as_fn_error "conditional \"TSAN_SUPPORTED\" was never defined.
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Usually this means the macro was only invoked conditionally." "$LINENO" 5
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fi
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if test -z "${USING_MACH_OVERRIDE_TRUE}" && test -z "${USING_MACH_OVERRIDE_FALSE}"; then
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as_fn_error "conditional \"USING_MACH_OVERRIDE\" was never defined.
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Usually this means the macro was only invoked conditionally." "$LINENO" 5
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fi
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: ${CONFIG_STATUS=./config.status}
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ac_write_fail=0
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@ -80,6 +80,12 @@ unset TSAN_SUPPORTED
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. ${srcdir}/configure.tgt
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AM_CONDITIONAL(TSAN_SUPPORTED, [test "x$TSAN_SUPPORTED" = "xyes"])
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case "$host" in
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*-*-darwin*) MACH_OVERRIDE=true ;;
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*) MACH_OVERRIDE=false ;;
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esac
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AM_CONDITIONAL(USING_MACH_OVERRIDE, $MACH_OVERRIDE)
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AC_CONFIG_FILES([Makefile])
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AC_CONFIG_FILES(AC_FOREACH([DIR], [interception sanitizer_common asan], [DIR/Makefile ]),
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@ -27,6 +27,9 @@ case "${target}" in
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;;
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sparc*-*-linux*)
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;;
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x86_64-*-darwin* | i?86-*-darwin*)
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TSAN_SUPPORTED=no
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;;
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*)
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UNSUPPORTED=1
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;;
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@ -14,7 +14,11 @@ interception_files = \
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interception_mac.cc \
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interception_win.cc
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libinterception_la_SOURCES = $(interception_files)
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if USING_MACH_OVERRIDE
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libinterception_la_SOURCES = $(interception_files) mach_override/mach_override.c
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else
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libinterception_la_SOURCES = $(interception_files)
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endif
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# Work around what appears to be a GNU make bug handling MAKEFLAGS
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# values defined in terms of make variables, as is the case for CC and
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@ -53,14 +53,29 @@ CONFIG_CLEAN_FILES =
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CONFIG_CLEAN_VPATH_FILES =
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LTLIBRARIES = $(noinst_LTLIBRARIES)
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libinterception_la_LIBADD =
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am__libinterception_la_SOURCES_DIST = interception_linux.cc \
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interception_mac.cc interception_win.cc \
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mach_override/mach_override.c
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am__objects_1 = interception_linux.lo interception_mac.lo \
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interception_win.lo
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am_libinterception_la_OBJECTS = $(am__objects_1)
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@USING_MACH_OVERRIDE_FALSE@am_libinterception_la_OBJECTS = \
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@USING_MACH_OVERRIDE_FALSE@ $(am__objects_1)
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@USING_MACH_OVERRIDE_TRUE@am_libinterception_la_OBJECTS = \
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@USING_MACH_OVERRIDE_TRUE@ $(am__objects_1) mach_override.lo
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libinterception_la_OBJECTS = $(am_libinterception_la_OBJECTS)
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DEFAULT_INCLUDES = -I.@am__isrc@
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depcomp = $(SHELL) $(top_srcdir)/../depcomp
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am__depfiles_maybe = depfiles
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am__mv = mv -f
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COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
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$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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--mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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CCLD = $(CC)
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LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
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$(LDFLAGS) -o $@
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CXXCOMPILE = $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)
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LTCXXCOMPILE = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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@ -71,7 +86,7 @@ CXXLINK = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
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--mode=link $(CXXLD) $(AM_CXXFLAGS) $(CXXFLAGS) $(AM_LDFLAGS) \
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$(LDFLAGS) -o $@
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SOURCES = $(libinterception_la_SOURCES)
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DIST_SOURCES = $(libinterception_la_SOURCES)
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DIST_SOURCES = $(am__libinterception_la_SOURCES_DIST)
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ETAGS = etags
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CTAGS = ctags
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DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
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@ -215,7 +230,8 @@ interception_files = \
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interception_mac.cc \
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interception_win.cc
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libinterception_la_SOURCES = $(interception_files)
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@USING_MACH_OVERRIDE_FALSE@libinterception_la_SOURCES = $(interception_files)
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@USING_MACH_OVERRIDE_TRUE@libinterception_la_SOURCES = $(interception_files) mach_override/mach_override.c
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# Work around what appears to be a GNU make bug handling MAKEFLAGS
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# values defined in terms of make variables, as is the case for CC and
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@ -261,7 +277,7 @@ MAKEOVERRIDES =
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all: all-am
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.SUFFIXES:
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.SUFFIXES: .cc .lo .o .obj
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.SUFFIXES: .c .cc .lo .o .obj
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$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am $(am__configure_deps)
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@for dep in $?; do \
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case '$(am__configure_deps)' in \
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@ -313,6 +329,35 @@ distclean-compile:
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@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/interception_linux.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/interception_mac.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/interception_win.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mach_override.Plo@am__quote@
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.c.o:
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@am__fastdepCC_TRUE@ $(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
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@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCC_FALSE@ $(COMPILE) -c $<
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.c.obj:
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@am__fastdepCC_TRUE@ $(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
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@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCC_FALSE@ $(COMPILE) -c `$(CYGPATH_W) '$<'`
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.c.lo:
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@am__fastdepCC_TRUE@ $(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
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@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCC_FALSE@ $(LTCOMPILE) -c -o $@ $<
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mach_override.lo: mach_override/mach_override.c
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@am__fastdepCC_TRUE@ $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT mach_override.lo -MD -MP -MF $(DEPDIR)/mach_override.Tpo -c -o mach_override.lo `test -f 'mach_override/mach_override.c' || echo '$(srcdir)/'`mach_override/mach_override.c
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@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/mach_override.Tpo $(DEPDIR)/mach_override.Plo
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='mach_override/mach_override.c' object='mach_override.lo' libtool=yes @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCC_FALSE@ $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o mach_override.lo `test -f 'mach_override/mach_override.c' || echo '$(srcdir)/'`mach_override/mach_override.c
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.cc.o:
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@am__fastdepCXX_TRUE@ $(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
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3
libsanitizer/interception/mach_override/LICENSE.txt
Normal file
3
libsanitizer/interception/mach_override/LICENSE.txt
Normal file
@ -0,0 +1,3 @@
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Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
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Some rights reserved: <http://opensource.org/licenses/mit-license.php>
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970
libsanitizer/interception/mach_override/mach_override.c
Normal file
970
libsanitizer/interception/mach_override/mach_override.c
Normal file
@ -0,0 +1,970 @@
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/*******************************************************************************
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mach_override.c
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Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
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Some rights reserved: <http://opensource.org/licenses/mit-license.php>
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***************************************************************************/
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#ifdef __APPLE__
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#include "mach_override.h"
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#include <mach-o/dyld.h>
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#include <mach/mach_host.h>
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#include <mach/mach_init.h>
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#include <mach/vm_map.h>
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#include <sys/mman.h>
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#include <CoreServices/CoreServices.h>
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//#define DEBUG_DISASM 1
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#undef DEBUG_DISASM
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/**************************
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*
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* Constants
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*
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**************************/
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#pragma mark -
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#pragma mark (Constants)
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#if defined(__ppc__) || defined(__POWERPC__)
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static
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long kIslandTemplate[] = {
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0x9001FFFC, // stw r0,-4(SP)
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0x3C00DEAD, // lis r0,0xDEAD
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0x6000BEEF, // ori r0,r0,0xBEEF
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0x7C0903A6, // mtctr r0
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0x8001FFFC, // lwz r0,-4(SP)
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0x60000000, // nop ; optionally replaced
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0x4E800420 // bctr
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};
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#define kAddressHi 3
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#define kAddressLo 5
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#define kInstructionHi 10
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#define kInstructionLo 11
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#elif defined(__i386__)
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#define kOriginalInstructionsSize 16
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static
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unsigned char kIslandTemplate[] = {
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// kOriginalInstructionsSize nop instructions so that we
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// should have enough space to host original instructions
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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// Now the real jump instruction
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0xE9, 0xEF, 0xBE, 0xAD, 0xDE
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};
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#define kInstructions 0
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#define kJumpAddress kInstructions + kOriginalInstructionsSize + 1
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#elif defined(__x86_64__)
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#define kOriginalInstructionsSize 32
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#define kJumpAddress kOriginalInstructionsSize + 6
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static
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unsigned char kIslandTemplate[] = {
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// kOriginalInstructionsSize nop instructions so that we
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// should have enough space to host original instructions
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
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// Now the real jump instruction
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0xFF, 0x25, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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};
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#endif
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#define kAllocateHigh 1
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#define kAllocateNormal 0
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/**************************
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*
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* Data Types
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*
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**************************/
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#pragma mark -
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#pragma mark (Data Types)
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typedef struct {
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char instructions[sizeof(kIslandTemplate)];
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int allocatedHigh;
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} BranchIsland;
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/**************************
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*
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* Funky Protos
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*
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**************************/
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#pragma mark -
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#pragma mark (Funky Protos)
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static mach_error_t
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allocateBranchIsland(
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BranchIsland **island,
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int allocateHigh,
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void *originalFunctionAddress);
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static mach_error_t
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freeBranchIsland(
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BranchIsland *island );
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static mach_error_t
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defaultIslandMalloc(
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void **ptr, size_t unused_size, void *hint);
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static mach_error_t
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defaultIslandFree(
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void *ptr);
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#if defined(__ppc__) || defined(__POWERPC__)
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static mach_error_t
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setBranchIslandTarget(
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BranchIsland *island,
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const void *branchTo,
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long instruction );
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#endif
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#if defined(__i386__) || defined(__x86_64__)
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static mach_error_t
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setBranchIslandTarget_i386(
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BranchIsland *island,
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const void *branchTo,
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char* instructions );
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// Can't be made static because there's no C implementation for atomic_mov64
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// on i386.
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void
|
||||
atomic_mov64(
|
||||
uint64_t *targetAddress,
|
||||
uint64_t value ) __attribute__((visibility("hidden")));
|
||||
|
||||
static Boolean
|
||||
eatKnownInstructions(
|
||||
unsigned char *code,
|
||||
uint64_t *newInstruction,
|
||||
int *howManyEaten,
|
||||
char *originalInstructions,
|
||||
int *originalInstructionCount,
|
||||
uint8_t *originalInstructionSizes );
|
||||
|
||||
static void
|
||||
fixupInstructions(
|
||||
void *originalFunction,
|
||||
void *escapeIsland,
|
||||
void *instructionsToFix,
|
||||
int instructionCount,
|
||||
uint8_t *instructionSizes );
|
||||
|
||||
#ifdef DEBUG_DISASM
|
||||
static void
|
||||
dump16Bytes(
|
||||
void *ptr);
|
||||
#endif // DEBUG_DISASM
|
||||
#endif
|
||||
|
||||
/*******************************************************************************
|
||||
*
|
||||
* Interface
|
||||
*
|
||||
*******************************************************************************/
|
||||
#pragma mark -
|
||||
#pragma mark (Interface)
|
||||
|
||||
#if defined(__i386__) || defined(__x86_64__)
|
||||
static mach_error_t makeIslandExecutable(void *address) {
|
||||
mach_error_t err = err_none;
|
||||
vm_size_t pageSize;
|
||||
host_page_size( mach_host_self(), &pageSize );
|
||||
uintptr_t page = (uintptr_t)address & ~(uintptr_t)(pageSize-1);
|
||||
int e = err_none;
|
||||
e |= mprotect((void *)page, pageSize, PROT_EXEC | PROT_READ | PROT_WRITE);
|
||||
e |= msync((void *)page, pageSize, MS_INVALIDATE );
|
||||
if (e) {
|
||||
err = err_cannot_override;
|
||||
}
|
||||
return err;
|
||||
}
|
||||
#endif
|
||||
|
||||
static mach_error_t
|
||||
defaultIslandMalloc(
|
||||
void **ptr, size_t unused_size, void *hint) {
|
||||
return allocateBranchIsland( (BranchIsland**)ptr, kAllocateHigh, hint );
|
||||
}
|
||||
static mach_error_t
|
||||
defaultIslandFree(
|
||||
void *ptr) {
|
||||
return freeBranchIsland(ptr);
|
||||
}
|
||||
|
||||
mach_error_t
|
||||
__asan_mach_override_ptr(
|
||||
void *originalFunctionAddress,
|
||||
const void *overrideFunctionAddress,
|
||||
void **originalFunctionReentryIsland )
|
||||
{
|
||||
return __asan_mach_override_ptr_custom(originalFunctionAddress,
|
||||
overrideFunctionAddress,
|
||||
originalFunctionReentryIsland,
|
||||
defaultIslandMalloc,
|
||||
defaultIslandFree);
|
||||
}
|
||||
|
||||
mach_error_t
|
||||
__asan_mach_override_ptr_custom(
|
||||
void *originalFunctionAddress,
|
||||
const void *overrideFunctionAddress,
|
||||
void **originalFunctionReentryIsland,
|
||||
island_malloc *alloc,
|
||||
island_free *dealloc)
|
||||
{
|
||||
assert( originalFunctionAddress );
|
||||
assert( overrideFunctionAddress );
|
||||
|
||||
// this addresses overriding such functions as AudioOutputUnitStart()
|
||||
// test with modified DefaultOutputUnit project
|
||||
#if defined(__x86_64__)
|
||||
for(;;){
|
||||
if(*(uint16_t*)originalFunctionAddress==0x25FF) // jmp qword near [rip+0x????????]
|
||||
originalFunctionAddress=*(void**)((char*)originalFunctionAddress+6+*(int32_t *)((uint16_t*)originalFunctionAddress+1));
|
||||
else break;
|
||||
}
|
||||
#elif defined(__i386__)
|
||||
for(;;){
|
||||
if(*(uint16_t*)originalFunctionAddress==0x25FF) // jmp *0x????????
|
||||
originalFunctionAddress=**(void***)((uint16_t*)originalFunctionAddress+1);
|
||||
else break;
|
||||
}
|
||||
#endif
|
||||
#ifdef DEBUG_DISASM
|
||||
{
|
||||
fprintf(stderr, "Replacing function at %p\n", originalFunctionAddress);
|
||||
fprintf(stderr, "First 16 bytes of the function: ");
|
||||
unsigned char *orig = (unsigned char *)originalFunctionAddress;
|
||||
int i;
|
||||
for (i = 0; i < 16; i++) {
|
||||
fprintf(stderr, "%x ", (unsigned int) orig[i]);
|
||||
}
|
||||
fprintf(stderr, "\n");
|
||||
fprintf(stderr,
|
||||
"To disassemble, save the following function as disas.c"
|
||||
" and run:\n gcc -c disas.c && gobjdump -d disas.o\n"
|
||||
"The first 16 bytes of the original function will start"
|
||||
" after four nop instructions.\n");
|
||||
fprintf(stderr, "\nvoid foo() {\n asm volatile(\"nop;nop;nop;nop;\");\n");
|
||||
int j = 0;
|
||||
for (j = 0; j < 2; j++) {
|
||||
fprintf(stderr, " asm volatile(\".byte ");
|
||||
for (i = 8 * j; i < 8 * (j+1) - 1; i++) {
|
||||
fprintf(stderr, "0x%x, ", (unsigned int) orig[i]);
|
||||
}
|
||||
fprintf(stderr, "0x%x;\");\n", (unsigned int) orig[8 * (j+1) - 1]);
|
||||
}
|
||||
fprintf(stderr, "}\n\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
long *originalFunctionPtr = (long*) originalFunctionAddress;
|
||||
mach_error_t err = err_none;
|
||||
|
||||
#if defined(__ppc__) || defined(__POWERPC__)
|
||||
// Ensure first instruction isn't 'mfctr'.
|
||||
#define kMFCTRMask 0xfc1fffff
|
||||
#define kMFCTRInstruction 0x7c0903a6
|
||||
|
||||
long originalInstruction = *originalFunctionPtr;
|
||||
if( !err && ((originalInstruction & kMFCTRMask) == kMFCTRInstruction) )
|
||||
err = err_cannot_override;
|
||||
#elif defined(__i386__) || defined(__x86_64__)
|
||||
int eatenCount = 0;
|
||||
int originalInstructionCount = 0;
|
||||
char originalInstructions[kOriginalInstructionsSize];
|
||||
uint8_t originalInstructionSizes[kOriginalInstructionsSize];
|
||||
uint64_t jumpRelativeInstruction = 0; // JMP
|
||||
|
||||
Boolean overridePossible = eatKnownInstructions ((unsigned char *)originalFunctionPtr,
|
||||
&jumpRelativeInstruction, &eatenCount,
|
||||
originalInstructions, &originalInstructionCount,
|
||||
originalInstructionSizes );
|
||||
#ifdef DEBUG_DISASM
|
||||
if (!overridePossible) fprintf(stderr, "overridePossible = false @%d\n", __LINE__);
|
||||
#endif
|
||||
if (eatenCount > kOriginalInstructionsSize) {
|
||||
#ifdef DEBUG_DISASM
|
||||
fprintf(stderr, "Too many instructions eaten\n");
|
||||
#endif
|
||||
overridePossible = false;
|
||||
}
|
||||
if (!overridePossible) err = err_cannot_override;
|
||||
if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
|
||||
#endif
|
||||
|
||||
// Make the original function implementation writable.
|
||||
if( !err ) {
|
||||
err = vm_protect( mach_task_self(),
|
||||
(vm_address_t) originalFunctionPtr, 8, false,
|
||||
(VM_PROT_ALL | VM_PROT_COPY) );
|
||||
if( err )
|
||||
err = vm_protect( mach_task_self(),
|
||||
(vm_address_t) originalFunctionPtr, 8, false,
|
||||
(VM_PROT_DEFAULT | VM_PROT_COPY) );
|
||||
}
|
||||
if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
|
||||
|
||||
// Allocate and target the escape island to the overriding function.
|
||||
BranchIsland *escapeIsland = NULL;
|
||||
if( !err )
|
||||
err = alloc( (void**)&escapeIsland, sizeof(BranchIsland), originalFunctionAddress );
|
||||
if ( err ) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
|
||||
|
||||
#if defined(__ppc__) || defined(__POWERPC__)
|
||||
if( !err )
|
||||
err = setBranchIslandTarget( escapeIsland, overrideFunctionAddress, 0 );
|
||||
|
||||
// Build the branch absolute instruction to the escape island.
|
||||
long branchAbsoluteInstruction = 0; // Set to 0 just to silence warning.
|
||||
if( !err ) {
|
||||
long escapeIslandAddress = ((long) escapeIsland) & 0x3FFFFFF;
|
||||
branchAbsoluteInstruction = 0x48000002 | escapeIslandAddress;
|
||||
}
|
||||
#elif defined(__i386__) || defined(__x86_64__)
|
||||
if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
|
||||
|
||||
if( !err )
|
||||
err = setBranchIslandTarget_i386( escapeIsland, overrideFunctionAddress, 0 );
|
||||
|
||||
if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
|
||||
// Build the jump relative instruction to the escape island
|
||||
#endif
|
||||
|
||||
|
||||
#if defined(__i386__) || defined(__x86_64__)
|
||||
if (!err) {
|
||||
uint32_t addressOffset = ((char*)escapeIsland - (char*)originalFunctionPtr - 5);
|
||||
addressOffset = OSSwapInt32(addressOffset);
|
||||
|
||||
jumpRelativeInstruction |= 0xE900000000000000LL;
|
||||
jumpRelativeInstruction |= ((uint64_t)addressOffset & 0xffffffff) << 24;
|
||||
jumpRelativeInstruction = OSSwapInt64(jumpRelativeInstruction);
|
||||
}
|
||||
#endif
|
||||
|
||||
// Optionally allocate & return the reentry island. This may contain relocated
|
||||
// jmp instructions and so has all the same addressing reachability requirements
|
||||
// the escape island has to the original function, except the escape island is
|
||||
// technically our original function.
|
||||
BranchIsland *reentryIsland = NULL;
|
||||
if( !err && originalFunctionReentryIsland ) {
|
||||
err = alloc( (void**)&reentryIsland, sizeof(BranchIsland), escapeIsland);
|
||||
if( !err )
|
||||
*originalFunctionReentryIsland = reentryIsland;
|
||||
}
|
||||
|
||||
#if defined(__ppc__) || defined(__POWERPC__)
|
||||
// Atomically:
|
||||
// o If the reentry island was allocated:
|
||||
// o Insert the original instruction into the reentry island.
|
||||
// o Target the reentry island at the 2nd instruction of the
|
||||
// original function.
|
||||
// o Replace the original instruction with the branch absolute.
|
||||
if( !err ) {
|
||||
int escapeIslandEngaged = false;
|
||||
do {
|
||||
if( reentryIsland )
|
||||
err = setBranchIslandTarget( reentryIsland,
|
||||
(void*) (originalFunctionPtr+1), originalInstruction );
|
||||
if( !err ) {
|
||||
escapeIslandEngaged = CompareAndSwap( originalInstruction,
|
||||
branchAbsoluteInstruction,
|
||||
(UInt32*)originalFunctionPtr );
|
||||
if( !escapeIslandEngaged ) {
|
||||
// Someone replaced the instruction out from under us,
|
||||
// re-read the instruction, make sure it's still not
|
||||
// 'mfctr' and try again.
|
||||
originalInstruction = *originalFunctionPtr;
|
||||
if( (originalInstruction & kMFCTRMask) == kMFCTRInstruction)
|
||||
err = err_cannot_override;
|
||||
}
|
||||
}
|
||||
} while( !err && !escapeIslandEngaged );
|
||||
}
|
||||
#elif defined(__i386__) || defined(__x86_64__)
|
||||
// Atomically:
|
||||
// o If the reentry island was allocated:
|
||||
// o Insert the original instructions into the reentry island.
|
||||
// o Target the reentry island at the first non-replaced
|
||||
// instruction of the original function.
|
||||
// o Replace the original first instructions with the jump relative.
|
||||
//
|
||||
// Note that on i386, we do not support someone else changing the code under our feet
|
||||
if ( !err ) {
|
||||
fixupInstructions(originalFunctionPtr, reentryIsland, originalInstructions,
|
||||
originalInstructionCount, originalInstructionSizes );
|
||||
|
||||
if( reentryIsland )
|
||||
err = setBranchIslandTarget_i386( reentryIsland,
|
||||
(void*) ((char *)originalFunctionPtr+eatenCount), originalInstructions );
|
||||
// try making islands executable before planting the jmp
|
||||
#if defined(__x86_64__) || defined(__i386__)
|
||||
if( !err )
|
||||
err = makeIslandExecutable(escapeIsland);
|
||||
if( !err && reentryIsland )
|
||||
err = makeIslandExecutable(reentryIsland);
|
||||
#endif
|
||||
if ( !err )
|
||||
atomic_mov64((uint64_t *)originalFunctionPtr, jumpRelativeInstruction);
|
||||
}
|
||||
#endif
|
||||
|
||||
// Clean up on error.
|
||||
if( err ) {
|
||||
if( reentryIsland )
|
||||
dealloc( reentryIsland );
|
||||
if( escapeIsland )
|
||||
dealloc( escapeIsland );
|
||||
}
|
||||
|
||||
#ifdef DEBUG_DISASM
|
||||
{
|
||||
fprintf(stderr, "First 16 bytes of the function after slicing: ");
|
||||
unsigned char *orig = (unsigned char *)originalFunctionAddress;
|
||||
int i;
|
||||
for (i = 0; i < 16; i++) {
|
||||
fprintf(stderr, "%x ", (unsigned int) orig[i]);
|
||||
}
|
||||
fprintf(stderr, "\n");
|
||||
}
|
||||
#endif
|
||||
return err;
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
*
|
||||
* Implementation
|
||||
*
|
||||
*******************************************************************************/
|
||||
#pragma mark -
|
||||
#pragma mark (Implementation)
|
||||
|
||||
/***************************************************************************//**
|
||||
Implementation: Allocates memory for a branch island.
|
||||
|
||||
@param island <- The allocated island.
|
||||
@param allocateHigh -> Whether to allocate the island at the end of the
|
||||
address space (for use with the branch absolute
|
||||
instruction).
|
||||
@result <- mach_error_t
|
||||
|
||||
***************************************************************************/
|
||||
|
||||
static mach_error_t
|
||||
allocateBranchIsland(
|
||||
BranchIsland **island,
|
||||
int allocateHigh,
|
||||
void *originalFunctionAddress)
|
||||
{
|
||||
assert( island );
|
||||
|
||||
mach_error_t err = err_none;
|
||||
|
||||
if( allocateHigh ) {
|
||||
vm_size_t pageSize;
|
||||
err = host_page_size( mach_host_self(), &pageSize );
|
||||
if( !err ) {
|
||||
assert( sizeof( BranchIsland ) <= pageSize );
|
||||
#if defined(__ppc__) || defined(__POWERPC__)
|
||||
vm_address_t first = 0xfeffffff;
|
||||
vm_address_t last = 0xfe000000 + pageSize;
|
||||
#elif defined(__x86_64__)
|
||||
vm_address_t first = ((uint64_t)originalFunctionAddress & ~(uint64_t)(((uint64_t)1 << 31) - 1)) | ((uint64_t)1 << 31); // start in the middle of the page?
|
||||
vm_address_t last = 0x0;
|
||||
#else
|
||||
vm_address_t first = 0xffc00000;
|
||||
vm_address_t last = 0xfffe0000;
|
||||
#endif
|
||||
|
||||
vm_address_t page = first;
|
||||
int allocated = 0;
|
||||
vm_map_t task_self = mach_task_self();
|
||||
|
||||
while( !err && !allocated && page != last ) {
|
||||
|
||||
err = vm_allocate( task_self, &page, pageSize, 0 );
|
||||
if( err == err_none )
|
||||
allocated = 1;
|
||||
else if( err == KERN_NO_SPACE ) {
|
||||
#if defined(__x86_64__)
|
||||
page -= pageSize;
|
||||
#else
|
||||
page += pageSize;
|
||||
#endif
|
||||
err = err_none;
|
||||
}
|
||||
}
|
||||
if( allocated )
|
||||
*island = (BranchIsland*) page;
|
||||
else if( !allocated && !err )
|
||||
err = KERN_NO_SPACE;
|
||||
}
|
||||
} else {
|
||||
void *block = malloc( sizeof( BranchIsland ) );
|
||||
if( block )
|
||||
*island = block;
|
||||
else
|
||||
err = KERN_NO_SPACE;
|
||||
}
|
||||
if( !err )
|
||||
(**island).allocatedHigh = allocateHigh;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/***************************************************************************//**
|
||||
Implementation: Deallocates memory for a branch island.
|
||||
|
||||
@param island -> The island to deallocate.
|
||||
@result <- mach_error_t
|
||||
|
||||
***************************************************************************/
|
||||
|
||||
static mach_error_t
|
||||
freeBranchIsland(
|
||||
BranchIsland *island )
|
||||
{
|
||||
assert( island );
|
||||
assert( (*(long*)&island->instructions[0]) == kIslandTemplate[0] );
|
||||
assert( island->allocatedHigh );
|
||||
|
||||
mach_error_t err = err_none;
|
||||
|
||||
if( island->allocatedHigh ) {
|
||||
vm_size_t pageSize;
|
||||
err = host_page_size( mach_host_self(), &pageSize );
|
||||
if( !err ) {
|
||||
assert( sizeof( BranchIsland ) <= pageSize );
|
||||
err = vm_deallocate(
|
||||
mach_task_self(),
|
||||
(vm_address_t) island, pageSize );
|
||||
}
|
||||
} else {
|
||||
free( island );
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/***************************************************************************//**
|
||||
Implementation: Sets the branch island's target, with an optional
|
||||
instruction.
|
||||
|
||||
@param island -> The branch island to insert target into.
|
||||
@param branchTo -> The address of the target.
|
||||
@param instruction -> Optional instruction to execute prior to branch. Set
|
||||
to zero for nop.
|
||||
@result <- mach_error_t
|
||||
|
||||
***************************************************************************/
|
||||
#if defined(__ppc__) || defined(__POWERPC__)
|
||||
static mach_error_t
|
||||
setBranchIslandTarget(
|
||||
BranchIsland *island,
|
||||
const void *branchTo,
|
||||
long instruction )
|
||||
{
|
||||
// Copy over the template code.
|
||||
bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
|
||||
|
||||
// Fill in the address.
|
||||
((short*)island->instructions)[kAddressLo] = ((long) branchTo) & 0x0000FFFF;
|
||||
((short*)island->instructions)[kAddressHi]
|
||||
= (((long) branchTo) >> 16) & 0x0000FFFF;
|
||||
|
||||
// Fill in the (optional) instuction.
|
||||
if( instruction != 0 ) {
|
||||
((short*)island->instructions)[kInstructionLo]
|
||||
= instruction & 0x0000FFFF;
|
||||
((short*)island->instructions)[kInstructionHi]
|
||||
= (instruction >> 16) & 0x0000FFFF;
|
||||
}
|
||||
|
||||
//MakeDataExecutable( island->instructions, sizeof( kIslandTemplate ) );
|
||||
msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
|
||||
|
||||
return err_none;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(__i386__)
|
||||
static mach_error_t
|
||||
setBranchIslandTarget_i386(
|
||||
BranchIsland *island,
|
||||
const void *branchTo,
|
||||
char* instructions )
|
||||
{
|
||||
|
||||
// Copy over the template code.
|
||||
bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
|
||||
|
||||
// copy original instructions
|
||||
if (instructions) {
|
||||
bcopy (instructions, island->instructions + kInstructions, kOriginalInstructionsSize);
|
||||
}
|
||||
|
||||
// Fill in the address.
|
||||
int32_t addressOffset = (char *)branchTo - (island->instructions + kJumpAddress + 4);
|
||||
*((int32_t *)(island->instructions + kJumpAddress)) = addressOffset;
|
||||
|
||||
msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
|
||||
return err_none;
|
||||
}
|
||||
|
||||
#elif defined(__x86_64__)
|
||||
static mach_error_t
|
||||
setBranchIslandTarget_i386(
|
||||
BranchIsland *island,
|
||||
const void *branchTo,
|
||||
char* instructions )
|
||||
{
|
||||
// Copy over the template code.
|
||||
bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
|
||||
|
||||
// Copy original instructions.
|
||||
if (instructions) {
|
||||
bcopy (instructions, island->instructions, kOriginalInstructionsSize);
|
||||
}
|
||||
|
||||
// Fill in the address.
|
||||
*((uint64_t *)(island->instructions + kJumpAddress)) = (uint64_t)branchTo;
|
||||
msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
|
||||
|
||||
return err_none;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
#if defined(__i386__) || defined(__x86_64__)
|
||||
// simplistic instruction matching
|
||||
typedef struct {
|
||||
unsigned int length; // max 15
|
||||
unsigned char mask[15]; // sequence of bytes in memory order
|
||||
unsigned char constraint[15]; // sequence of bytes in memory order
|
||||
} AsmInstructionMatch;
|
||||
|
||||
#if defined(__i386__)
|
||||
static AsmInstructionMatch possibleInstructions[] = {
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} }, // jmp 0x????????
|
||||
{ 0x5, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0x55, 0x89, 0xe5, 0xc9, 0xc3} }, // push %esp; mov %esp,%ebp; leave; ret
|
||||
{ 0x1, {0xFF}, {0x90} }, // nop
|
||||
{ 0x1, {0xF8}, {0x50} }, // push %reg
|
||||
{ 0x2, {0xFF, 0xFF}, {0x89, 0xE5} }, // mov %esp,%ebp
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x89, 0x1C, 0x24} }, // mov %ebx,(%esp)
|
||||
{ 0x3, {0xFF, 0xFF, 0x00}, {0x83, 0xEC, 0x00} }, // sub 0x??, %esp
|
||||
{ 0x6, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00}, {0x81, 0xEC, 0x00, 0x00, 0x00, 0x00} }, // sub 0x??, %esp with 32bit immediate
|
||||
{ 0x2, {0xFF, 0xFF}, {0x31, 0xC0} }, // xor %eax, %eax
|
||||
{ 0x3, {0xFF, 0x4F, 0x00}, {0x8B, 0x45, 0x00} }, // mov $imm(%ebp), %reg
|
||||
{ 0x3, {0xFF, 0x4C, 0x00}, {0x8B, 0x40, 0x00} }, // mov $imm(%eax-%edx), %reg
|
||||
{ 0x3, {0xFF, 0xCF, 0x00}, {0x8B, 0x4D, 0x00} }, // mov $imm(%rpb), %reg
|
||||
{ 0x3, {0xFF, 0x4F, 0x00}, {0x8A, 0x4D, 0x00} }, // mov $imm(%ebp), %cl
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x8B, 0x4C, 0x24, 0x00} }, // mov $imm(%esp), %ecx
|
||||
{ 0x4, {0xFF, 0x00, 0x00, 0x00}, {0x8B, 0x00, 0x00, 0x00} }, // mov r16,r/m16 or r32,r/m32
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xB9, 0x00, 0x00, 0x00, 0x00} }, // mov $imm, %ecx
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} }, // mov $imm, %eax
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x66, 0x0F, 0xEF, 0x00} }, // pxor xmm2/128, xmm1
|
||||
{ 0x2, {0xFF, 0xFF}, {0xDB, 0xE3} }, // fninit
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE8, 0x00, 0x00, 0x00, 0x00} }, // call $imm
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x0F, 0xBE, 0x55, 0x00} }, // movsbl $imm(%ebp), %edx
|
||||
{ 0x0, {0x00}, {0x00} }
|
||||
};
|
||||
#elif defined(__x86_64__)
|
||||
// TODO(glider): disassembling the "0x48, 0x89" sequences is trickier than it's done below.
|
||||
// If it stops working, refer to http://ref.x86asm.net/geek.html#modrm_byte_32_64 to do it
|
||||
// more accurately.
|
||||
// Note: 0x48 is in fact the REX.W prefix, but it might be wrong to treat it as a separate
|
||||
// instruction.
|
||||
static AsmInstructionMatch possibleInstructions[] = {
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} }, // jmp 0x????????
|
||||
{ 0x1, {0xFF}, {0x90} }, // nop
|
||||
{ 0x1, {0xF8}, {0x50} }, // push %rX
|
||||
{ 0x1, {0xFF}, {0x65} }, // GS prefix
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x48, 0x89, 0xE5} }, // mov %rsp,%rbp
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x48, 0x83, 0xEC, 0x00} }, // sub 0x??, %rsp
|
||||
{ 0x4, {0xFB, 0xFF, 0x07, 0x00}, {0x48, 0x89, 0x05, 0x00} }, // move onto rbp
|
||||
{ 0x3, {0xFB, 0xFF, 0x00}, {0x48, 0x89, 0x00} }, // mov %reg, %reg
|
||||
{ 0x3, {0xFB, 0xFF, 0x00}, {0x49, 0x89, 0x00} }, // mov %reg, %reg (REX.WB)
|
||||
{ 0x2, {0xFF, 0x00}, {0x41, 0x00} }, // push %rXX
|
||||
{ 0x2, {0xFF, 0x00}, {0x84, 0x00} }, // test %rX8,%rX8
|
||||
{ 0x2, {0xFF, 0x00}, {0x85, 0x00} }, // test %rX,%rX
|
||||
{ 0x2, {0xFF, 0x00}, {0x77, 0x00} }, // ja $i8
|
||||
{ 0x2, {0xFF, 0x00}, {0x74, 0x00} }, // je $i8
|
||||
{ 0x5, {0xF8, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} }, // mov $imm, %reg
|
||||
{ 0x3, {0xFF, 0xFF, 0x00}, {0xFF, 0x77, 0x00} }, // pushq $imm(%rdi)
|
||||
{ 0x2, {0xFF, 0xFF}, {0x31, 0xC0} }, // xor %eax, %eax
|
||||
{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0x25, 0x00, 0x00, 0x00, 0x00} }, // and $imm, %eax
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x80, 0x3F, 0x00} }, // cmpb $imm, (%rdi)
|
||||
|
||||
{ 0x8, {0xFF, 0xFF, 0xCF, 0xFF, 0x00, 0x00, 0x00, 0x00},
|
||||
{0x48, 0x8B, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00}, }, // mov $imm, %{rax,rdx,rsp,rsi}
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x48, 0x83, 0xFA, 0x00}, }, // cmp $i8, %rdx
|
||||
{ 0x4, {0xFF, 0xFF, 0x00, 0x00}, {0x83, 0x7f, 0x00, 0x00}, }, // cmpl $imm, $imm(%rdi)
|
||||
{ 0xa, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
|
||||
{0x48, 0xB8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00} }, // mov $imm, %rax
|
||||
{ 0x6, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00},
|
||||
{0x81, 0xE6, 0x00, 0x00, 0x00, 0x00} }, // and $imm, %esi
|
||||
{ 0x6, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00},
|
||||
{0xFF, 0x25, 0x00, 0x00, 0x00, 0x00} }, // jmpq *(%rip)
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x66, 0x0F, 0xEF, 0x00} }, // pxor xmm2/128, xmm1
|
||||
{ 0x2, {0xFF, 0x00}, {0x89, 0x00} }, // mov r/m32,r32 or r/m16,r16
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x49, 0x89, 0xF8} }, // mov %rdi,%r8
|
||||
{ 0x4, {0xFF, 0xFF, 0xFF, 0xFF}, {0x40, 0x0F, 0xBE, 0xCE} }, // movsbl %sil,%ecx
|
||||
{ 0x7, {0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00},
|
||||
{0x48, 0x8D, 0x05, 0x00, 0x00, 0x00, 0x00} }, // lea $imm(%rip),%rax
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x0F, 0xBE, 0xCE} }, // movsbl, %dh, %ecx
|
||||
{ 0x3, {0xFF, 0xFF, 0x00}, {0xFF, 0x77, 0x00} }, // pushq $imm(%rdi)
|
||||
{ 0x2, {0xFF, 0xFF}, {0xDB, 0xE3} }, // fninit
|
||||
{ 0x3, {0xFF, 0xFF, 0xFF}, {0x48, 0x85, 0xD2} }, // test %rdx,%rdx
|
||||
{ 0x0, {0x00}, {0x00} }
|
||||
};
|
||||
#endif
|
||||
|
||||
static Boolean codeMatchesInstruction(unsigned char *code, AsmInstructionMatch* instruction)
|
||||
{
|
||||
Boolean match = true;
|
||||
|
||||
size_t i;
|
||||
assert(instruction);
|
||||
#ifdef DEBUG_DISASM
|
||||
fprintf(stderr, "Matching: ");
|
||||
#endif
|
||||
for (i=0; i<instruction->length; i++) {
|
||||
unsigned char mask = instruction->mask[i];
|
||||
unsigned char constraint = instruction->constraint[i];
|
||||
unsigned char codeValue = code[i];
|
||||
#ifdef DEBUG_DISASM
|
||||
fprintf(stderr, "%x ", (unsigned)codeValue);
|
||||
#endif
|
||||
match = ((codeValue & mask) == constraint);
|
||||
if (!match) break;
|
||||
}
|
||||
#ifdef DEBUG_DISASM
|
||||
if (match) {
|
||||
fprintf(stderr, " OK\n");
|
||||
} else {
|
||||
fprintf(stderr, " FAIL\n");
|
||||
}
|
||||
#endif
|
||||
return match;
|
||||
}
|
||||
|
||||
#if defined(__i386__) || defined(__x86_64__)
|
||||
static Boolean
|
||||
eatKnownInstructions(
|
||||
unsigned char *code,
|
||||
uint64_t *newInstruction,
|
||||
int *howManyEaten,
|
||||
char *originalInstructions,
|
||||
int *originalInstructionCount,
|
||||
uint8_t *originalInstructionSizes )
|
||||
{
|
||||
Boolean allInstructionsKnown = true;
|
||||
int totalEaten = 0;
|
||||
unsigned char* ptr = code;
|
||||
int remainsToEat = 5; // a JMP instruction takes 5 bytes
|
||||
int instructionIndex = 0;
|
||||
|
||||
if (howManyEaten) *howManyEaten = 0;
|
||||
if (originalInstructionCount) *originalInstructionCount = 0;
|
||||
while (remainsToEat > 0) {
|
||||
Boolean curInstructionKnown = false;
|
||||
|
||||
// See if instruction matches one we know
|
||||
AsmInstructionMatch* curInstr = possibleInstructions;
|
||||
do {
|
||||
if ((curInstructionKnown = codeMatchesInstruction(ptr, curInstr))) break;
|
||||
curInstr++;
|
||||
} while (curInstr->length > 0);
|
||||
|
||||
// if all instruction matches failed, we don't know current instruction then, stop here
|
||||
if (!curInstructionKnown) {
|
||||
allInstructionsKnown = false;
|
||||
fprintf(stderr, "mach_override: some instructions unknown! Need to update mach_override.c\n");
|
||||
break;
|
||||
}
|
||||
|
||||
// At this point, we've matched curInstr
|
||||
int eaten = curInstr->length;
|
||||
ptr += eaten;
|
||||
remainsToEat -= eaten;
|
||||
totalEaten += eaten;
|
||||
|
||||
if (originalInstructionSizes) originalInstructionSizes[instructionIndex] = eaten;
|
||||
instructionIndex += 1;
|
||||
if (originalInstructionCount) *originalInstructionCount = instructionIndex;
|
||||
}
|
||||
|
||||
|
||||
if (howManyEaten) *howManyEaten = totalEaten;
|
||||
|
||||
if (originalInstructions) {
|
||||
Boolean enoughSpaceForOriginalInstructions = (totalEaten < kOriginalInstructionsSize);
|
||||
|
||||
if (enoughSpaceForOriginalInstructions) {
|
||||
memset(originalInstructions, 0x90 /* NOP */, kOriginalInstructionsSize); // fill instructions with NOP
|
||||
bcopy(code, originalInstructions, totalEaten);
|
||||
} else {
|
||||
#ifdef DEBUG_DISASM
|
||||
fprintf(stderr, "Not enough space in island to store original instructions. Adapt the island definition and kOriginalInstructionsSize\n");
|
||||
#endif
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
if (allInstructionsKnown) {
|
||||
// save last 3 bytes of first 64bits of codre we'll replace
|
||||
uint64_t currentFirst64BitsOfCode = *((uint64_t *)code);
|
||||
currentFirst64BitsOfCode = OSSwapInt64(currentFirst64BitsOfCode); // back to memory representation
|
||||
currentFirst64BitsOfCode &= 0x0000000000FFFFFFLL;
|
||||
|
||||
// keep only last 3 instructions bytes, first 5 will be replaced by JMP instr
|
||||
*newInstruction &= 0xFFFFFFFFFF000000LL; // clear last 3 bytes
|
||||
*newInstruction |= (currentFirst64BitsOfCode & 0x0000000000FFFFFFLL); // set last 3 bytes
|
||||
}
|
||||
|
||||
return allInstructionsKnown;
|
||||
}
|
||||
|
||||
static void
|
||||
fixupInstructions(
|
||||
void *originalFunction,
|
||||
void *escapeIsland,
|
||||
void *instructionsToFix,
|
||||
int instructionCount,
|
||||
uint8_t *instructionSizes )
|
||||
{
|
||||
void *initialOriginalFunction = originalFunction;
|
||||
int index, fixed_size, code_size = 0;
|
||||
for (index = 0;index < instructionCount;index += 1)
|
||||
code_size += instructionSizes[index];
|
||||
|
||||
#ifdef DEBUG_DISASM
|
||||
void *initialInstructionsToFix = instructionsToFix;
|
||||
fprintf(stderr, "BEFORE FIXING:\n");
|
||||
dump16Bytes(initialOriginalFunction);
|
||||
dump16Bytes(initialInstructionsToFix);
|
||||
#endif // DEBUG_DISASM
|
||||
|
||||
for (index = 0;index < instructionCount;index += 1)
|
||||
{
|
||||
fixed_size = instructionSizes[index];
|
||||
if ((*(uint8_t*)instructionsToFix == 0xE9) || // 32-bit jump relative
|
||||
(*(uint8_t*)instructionsToFix == 0xE8)) // 32-bit call relative
|
||||
{
|
||||
uint32_t offset = (uintptr_t)originalFunction - (uintptr_t)escapeIsland;
|
||||
uint32_t *jumpOffsetPtr = (uint32_t*)((uintptr_t)instructionsToFix + 1);
|
||||
*jumpOffsetPtr += offset;
|
||||
}
|
||||
if ((*(uint8_t*)instructionsToFix == 0x74) || // Near jump if equal (je), 2 bytes.
|
||||
(*(uint8_t*)instructionsToFix == 0x77)) // Near jump if above (ja), 2 bytes.
|
||||
{
|
||||
// We replace a near je/ja instruction, "7P JJ", with a 32-bit je/ja, "0F 8P WW XX YY ZZ".
|
||||
// This is critical, otherwise a near jump will likely fall outside the original function.
|
||||
uint32_t offset = (uintptr_t)initialOriginalFunction - (uintptr_t)escapeIsland;
|
||||
uint32_t jumpOffset = *(uint8_t*)((uintptr_t)instructionsToFix + 1);
|
||||
*((uint8_t*)instructionsToFix + 1) = *(uint8_t*)instructionsToFix + 0x10;
|
||||
*(uint8_t*)instructionsToFix = 0x0F;
|
||||
uint32_t *jumpOffsetPtr = (uint32_t*)((uintptr_t)instructionsToFix + 2 );
|
||||
*jumpOffsetPtr = offset + jumpOffset;
|
||||
fixed_size = 6;
|
||||
}
|
||||
|
||||
originalFunction = (void*)((uintptr_t)originalFunction + instructionSizes[index]);
|
||||
escapeIsland = (void*)((uintptr_t)escapeIsland + instructionSizes[index]);
|
||||
instructionsToFix = (void*)((uintptr_t)instructionsToFix + fixed_size);
|
||||
|
||||
// Expanding short instructions into longer ones may overwrite the next instructions,
|
||||
// so we must restore them.
|
||||
code_size -= fixed_size;
|
||||
if ((code_size > 0) && (fixed_size != instructionSizes[index])) {
|
||||
bcopy(originalFunction, instructionsToFix, code_size);
|
||||
}
|
||||
}
|
||||
#ifdef DEBUG_DISASM
|
||||
fprintf(stderr, "AFTER_FIXING:\n");
|
||||
dump16Bytes(initialOriginalFunction);
|
||||
dump16Bytes(initialInstructionsToFix);
|
||||
#endif // DEBUG_DISASM
|
||||
}
|
||||
|
||||
#ifdef DEBUG_DISASM
|
||||
#define HEX_DIGIT(x) ((((x) % 16) < 10) ? ('0' + ((x) % 16)) : ('A' + ((x) % 16 - 10)))
|
||||
|
||||
static void
|
||||
dump16Bytes(
|
||||
void *ptr) {
|
||||
int i;
|
||||
char buf[3];
|
||||
uint8_t *bytes = (uint8_t*)ptr;
|
||||
for (i = 0; i < 16; i++) {
|
||||
buf[0] = HEX_DIGIT(bytes[i] / 16);
|
||||
buf[1] = HEX_DIGIT(bytes[i] % 16);
|
||||
buf[2] = ' ';
|
||||
write(2, buf, 3);
|
||||
}
|
||||
write(2, "\n", 1);
|
||||
}
|
||||
#endif // DEBUG_DISASM
|
||||
#endif
|
||||
|
||||
#if defined(__i386__)
|
||||
__asm(
|
||||
".text;"
|
||||
".align 2, 0x90;"
|
||||
"_atomic_mov64:;"
|
||||
" pushl %ebp;"
|
||||
" movl %esp, %ebp;"
|
||||
" pushl %esi;"
|
||||
" pushl %ebx;"
|
||||
" pushl %ecx;"
|
||||
" pushl %eax;"
|
||||
" pushl %edx;"
|
||||
|
||||
// atomic push of value to an address
|
||||
// we use cmpxchg8b, which compares content of an address with
|
||||
// edx:eax. If they are equal, it atomically puts 64bit value
|
||||
// ecx:ebx in address.
|
||||
// We thus put contents of address in edx:eax to force ecx:ebx
|
||||
// in address
|
||||
" mov 8(%ebp), %esi;" // esi contains target address
|
||||
" mov 12(%ebp), %ebx;"
|
||||
" mov 16(%ebp), %ecx;" // ecx:ebx now contains value to put in target address
|
||||
" mov (%esi), %eax;"
|
||||
" mov 4(%esi), %edx;" // edx:eax now contains value currently contained in target address
|
||||
" lock; cmpxchg8b (%esi);" // atomic move.
|
||||
|
||||
// restore registers
|
||||
" popl %edx;"
|
||||
" popl %eax;"
|
||||
" popl %ecx;"
|
||||
" popl %ebx;"
|
||||
" popl %esi;"
|
||||
" popl %ebp;"
|
||||
" ret"
|
||||
);
|
||||
#elif defined(__x86_64__)
|
||||
void atomic_mov64(
|
||||
uint64_t *targetAddress,
|
||||
uint64_t value )
|
||||
{
|
||||
*targetAddress = value;
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
#endif // __APPLE__
|
||||
140
libsanitizer/interception/mach_override/mach_override.h
Normal file
140
libsanitizer/interception/mach_override/mach_override.h
Normal file
@ -0,0 +1,140 @@
|
||||
/*******************************************************************************
|
||||
mach_override.h
|
||||
Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
|
||||
Some rights reserved: <http://opensource.org/licenses/mit-license.php>
|
||||
|
||||
***************************************************************************/
|
||||
|
||||
/***************************************************************************//**
|
||||
@mainpage mach_override
|
||||
@author Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
|
||||
|
||||
This package, coded in C to the Mach API, allows you to override ("patch")
|
||||
program- and system-supplied functions at runtime. You can fully replace
|
||||
functions with your implementations, or merely head- or tail-patch the
|
||||
original implementations.
|
||||
|
||||
Use it by #include'ing mach_override.h from your .c, .m or .mm file(s).
|
||||
|
||||
@todo Discontinue use of Carbon's MakeDataExecutable() and
|
||||
CompareAndSwap() calls and start using the Mach equivalents, if they
|
||||
exist. If they don't, write them and roll them in. That way, this
|
||||
code will be pure Mach, which will make it easier to use everywhere.
|
||||
Update: MakeDataExecutable() has been replaced by
|
||||
msync(MS_INVALIDATE). There is an OSCompareAndSwap in libkern, but
|
||||
I'm currently unsure if I can link against it. May have to roll in
|
||||
my own version...
|
||||
@todo Stop using an entire 4K high-allocated VM page per 28-byte escape
|
||||
branch island. Done right, this will dramatically speed up escape
|
||||
island allocations when they number over 250. Then again, if you're
|
||||
overriding more than 250 functions, maybe speed isn't your main
|
||||
concern...
|
||||
@todo Add detection of: b, bl, bla, bc, bcl, bcla, bcctrl, bclrl
|
||||
first-instructions. Initially, we should refuse to override
|
||||
functions beginning with these instructions. Eventually, we should
|
||||
dynamically rewrite them to make them position-independent.
|
||||
@todo Write mach_unoverride(), which would remove an override placed on a
|
||||
function. Must be multiple-override aware, which means an almost
|
||||
complete rewrite under the covers, because the target address can't
|
||||
be spread across two load instructions like it is now since it will
|
||||
need to be atomically updatable.
|
||||
@todo Add non-rentry variants of overrides to test_mach_override.
|
||||
|
||||
***************************************************************************/
|
||||
|
||||
#ifdef __APPLE__
|
||||
|
||||
#ifndef _mach_override_
|
||||
#define _mach_override_
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <mach/error.h>
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/**
|
||||
Returned if the function to be overrided begins with a 'mfctr' instruction.
|
||||
*/
|
||||
#define err_cannot_override (err_local|1)
|
||||
|
||||
/************************************************************************************//**
|
||||
Dynamically overrides the function implementation referenced by
|
||||
originalFunctionAddress with the implentation pointed to by overrideFunctionAddress.
|
||||
Optionally returns a pointer to a "reentry island" which, if jumped to, will resume
|
||||
the original implementation.
|
||||
|
||||
@param originalFunctionAddress -> Required address of the function to
|
||||
override (with overrideFunctionAddress).
|
||||
@param overrideFunctionAddress -> Required address to the overriding
|
||||
function.
|
||||
@param originalFunctionReentryIsland <- Optional pointer to pointer to the
|
||||
reentry island. Can be NULL.
|
||||
@result <- err_cannot_override if the original
|
||||
function's implementation begins with
|
||||
the 'mfctr' instruction.
|
||||
|
||||
************************************************************************************/
|
||||
|
||||
// We're prefixing mach_override_ptr() with "__asan_" to avoid name conflicts with other
|
||||
// mach_override_ptr() implementations that may appear in the client program.
|
||||
mach_error_t
|
||||
__asan_mach_override_ptr(
|
||||
void *originalFunctionAddress,
|
||||
const void *overrideFunctionAddress,
|
||||
void **originalFunctionReentryIsland );
|
||||
|
||||
// Allow to use custom allocation and deallocation routines with mach_override_ptr().
|
||||
// This should help to speed up the things on x86_64.
|
||||
typedef mach_error_t island_malloc( void **ptr, size_t size, void *hint );
|
||||
typedef mach_error_t island_free( void *ptr );
|
||||
|
||||
mach_error_t
|
||||
__asan_mach_override_ptr_custom(
|
||||
void *originalFunctionAddress,
|
||||
const void *overrideFunctionAddress,
|
||||
void **originalFunctionReentryIsland,
|
||||
island_malloc *alloc,
|
||||
island_free *dealloc );
|
||||
|
||||
/************************************************************************************//**
|
||||
|
||||
|
||||
************************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
||||
#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR ) \
|
||||
{ \
|
||||
static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS; \
|
||||
static bool ORIGINAL_FUNCTION_NAME##_overriden = false; \
|
||||
class mach_override_class__##ORIGINAL_FUNCTION_NAME { \
|
||||
public: \
|
||||
static kern_return_t override(void *originalFunctionPtr) { \
|
||||
kern_return_t result = err_none; \
|
||||
if (!ORIGINAL_FUNCTION_NAME##_overriden) { \
|
||||
ORIGINAL_FUNCTION_NAME##_overriden = true; \
|
||||
result = mach_override_ptr( (void*)originalFunctionPtr, \
|
||||
(void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement, \
|
||||
(void**)&ORIGINAL_FUNCTION_NAME##_reenter ); \
|
||||
} \
|
||||
return result; \
|
||||
} \
|
||||
static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
|
||||
|
||||
#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME ) \
|
||||
} \
|
||||
}; \
|
||||
\
|
||||
err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME); \
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
#endif // _mach_override_
|
||||
|
||||
#endif // __APPLE__
|
||||
Loading…
Reference in New Issue
Block a user