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add compiler-rt build script
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Thomas Pöchtrager
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README.COMPILER-RT.md
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README.COMPILER-RT.md
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## COMPILER-RT ##
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### WHAT IS COMPILER-RT: ###
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Please see http://compiler-rt.llvm.org/.
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### INSTALLATION: ###
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Ensure you have finished `build.sh`,
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then run: `./build_compiler_rt.sh`.
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You can verify compiler-rt is working by invoking the following command:
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echo "int main(void){return 0;}" | xcrun clang -xc -o/dev/null -v - 2>&1 | \
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grep "libclang_rt" 1>/dev/null && echo "Success"
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If you see "Success", then everything went well.
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### USAGE: ###
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You do not need to do anything, clang's doing the job for you.
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However, `-fsanitize=address` is a bit annoying because the address sanitizer library is linked
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dynamically, and thus requires you to copy the ASAN runtime library onto the target system.
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The following example illustrates how to achieve this:
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# Example source code.
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$ cat test.c
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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int main(void) {
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char buf[2];
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strcpy(buf, "Hello World"); /* Buffer overflow. */
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puts(buf);
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return 0;
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}
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# Compile the source file.
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$ o64-clang test.c -fsanitize=address -o test
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# Ensure the ASAN library is linked in.
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$ xcrun otool -L test
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test:
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/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 104.1.0) # ASAN dep.
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@rpath/libclang_rt.asan_osx_dynamic.dylib (compatibility version 0.0.0, current version 0.0.0)
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/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
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# Copy 'test' and 'libclang_rt.asan_osx_dynamic.dylib' onto the target system.
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# You can find the ASAN library path easily with this one-liner:
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$ echo "int main(void){return 0;}" | xcrun clang -fsanitize=address -xc -o/dev/null -v - 2>&1 | \
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tr ' ' '\n' | grep libclang_rt.asan_osx_dynamic.dylib
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[...]/bin/../lib/clang/3.6.2/lib/darwin/libclang_rt.asan_osx_dynamic.dylib
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# Run ./test on the target system:
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$ DYLD_LIBRARY_PATH=. ./test
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=================================================================
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==410==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff58c3ec72 at pc [...]
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WRITE of size 12 at 0x7fff58c3ec72 thread T0
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#0 0x1070029ac ([...]/tmp/libclang_rt.asan_osx_dynamic.dylib+0x3a9ac)
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#1 0x106fc1d3a ([...]/tmp/./test+0x100000d3a)
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#2 0x106fc1bd3 ([...]/tmp/./test+0x100000bd3)
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#3 0x0 (<unknown module>)
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Address 0x7fff58c3ec72 is located in stack of thread T0 at offset 50 in frame
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#0 0x106fc1bef ([...]/tmp/./test+0x100000bef)
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This frame has 2 object(s):
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[32, 36) ''
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[48, 50) 'buf' <== Memory access at offset 50 overflows this variable
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HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
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(longjmp and C++ exceptions *are* supported)
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Shadow bytes around the buggy address:
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0x1fffeb187d30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187d40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187d50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187d60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187d70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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=>0x1fffeb187d80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2[02]f3
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0x1fffeb187d90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187da0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187db0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187dc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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0x1fffeb187dd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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Shadow byte legend (one shadow byte represents 8 application bytes):
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Addressable: 00
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Partially addressable: 01 02 03 04 05 06 07
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Heap left redzone: fa
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Heap right redzone: fb
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Freed heap region: fd
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Stack left redzone: f1
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Stack mid redzone: f2
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Stack right redzone: f3
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Stack partial redzone: f4
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Stack after return: f5
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Stack use after scope: f8
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Global redzone: f9
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Global init order: f6
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Poisoned by user: f7
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Container overflow: fc
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Array cookie: ac
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Intra object redzone: bb
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ASan internal: fe
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Left alloca redzone: ca
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Right alloca redzone: cb
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==410==ABORTING
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157
build_compiler_rt.sh
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build_compiler_rt.sh
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#!/usr/bin/env bash
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pushd "${0%/*}" &>/dev/null
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source tools/tools.sh
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eval $(tools/osxcross_conf.sh)
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if [ $PLATFORM == "Darwin" ]; then
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exit 0
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fi
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require git
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require $MAKE
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set +e
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which xcrun &>/dev/null
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# Clang <= 3.4 doesn't like '-arch x86_64h'
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if [ $? -ne 0 ] ||
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[[ $(xcrun clang -arch x86_64h --version 2>/dev/null) \
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== *Target:\ x86_64-* ]];
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then
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echo "Please re-run ./build.sh" 1>&2
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exit 1
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fi
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set -e
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CLANG_VERSION=$(echo "__clang_major__ __clang_minor__ __clang_patchlevel__" | \
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clang -xc -E - | tail -n1 | tr ' ' '.')
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set +e
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which llvm-config &>/dev/null && { CLANG_LIB_DIR=$(llvm-config --libdir); }
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set -e
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if [ -z "$CLANG_LIB_DIR" ]; then
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require $READLINK
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CLANG_LIB_DIR="$(dirname $($READLINK -f $(which clang)))/../lib"
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fi
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CLANG_LIB_DIR+="/clang"
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if [ ! -d "$CLANG_LIB_DIR" ]; then
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echo "$CLANG_LIB_DIR does not exist!" 1>&2
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echo "Installing llvm-dev may help" 1>&2
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exit 1
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fi
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# Drop patch level for <= 3.3.
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if [ $(osxcross-cmp $CLANG_VERSION "<=" 3.3) -eq 1 ]; then
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CLANG_VERSION=$(echo $CLANG_VERSION | tr '.' ' ' |
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awk '{print $1, $2}' | tr ' ' '.')
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fi
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CLANG_INCLUDE_DIR="${CLANG_LIB_DIR}/${CLANG_VERSION}/include"
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CLANG_DARWIN_LIB_DIR="${CLANG_LIB_DIR}/${CLANG_VERSION}/lib/darwin"
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case $CLANG_VERSION in
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3.2*) BRANCH=release_32 ;;
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3.3*) BRANCH=release_33 ;;
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3.4*) BRANCH=release_34 ;;
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3.5*) BRANCH=release_35 ;;
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3.6*) BRANCH=release_36 ;;
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3.7*) BRANCH=master ;;
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* ) echo "Unsupported Clang version, must be >= 3.2 and <= 3.7" 1>&2; exit 1;
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esac
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pushd $OSXCROSS_BUILD_DIR &>/dev/null
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if [ ! -e compiler-rt/.clone_complete ]; then
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rm -rf compiler-rt
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git clone http://llvm.org/git/compiler-rt.git
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fi
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pushd compiler-rt &>/dev/null
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git reset --hard
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git checkout $BRANCH
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git clean -fdx
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touch .clone_complete
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git pull
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sed -i "s/Configs += ios//g" make/platform/clang_darwin.mk
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sed -i "s/Configs += cc_kext_ios5//g" make/platform/clang_darwin.mk
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sed -i "s/Configs += profile_ios//g" make/platform/clang_darwin.mk
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sed -i "s/Configs += asan_iossim_dynamic//g" make/platform/clang_darwin.mk
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# Unbreak the -Werror build.
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if [ -f lib/asan/asan_mac.h ]; then
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sed -i "s/ASAN__MAC_H/ASAN_MAC_H/g" lib/asan/asan_mac.h
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fi
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if [ $(osxcross-cmp $CLANG_VERSION ">=" 3.5) -eq 1 ]; then
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export MACOSX_DEPLOYMENT_TARGET=10.7
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else
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export MACOSX_DEPLOYMENT_TARGET=10.4
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fi
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if [ $(osxcross-cmp $MACOSX_DEPLOYMENT_TARGET ">" \
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$OSXCROSS_SDK_VERSION) -eq 1 ];
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then
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echo ">= $MACOSX_DEPLOYMENT_TARGET SDK required" 1>&2
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exit 1
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fi
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EXTRA_MAKE_FLAGS="LIPO=\"xcrun lipo\""
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if [ $(osxcross-cmp $CLANG_VERSION "<=" 3.3) -eq 1 ]; then
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EXTRA_MAKE_FLAGS+=" AR=\"xcrun ar\""
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EXTRA_MAKE_FLAGS+=" RANLIB=\"xcrun ranlib\""
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EXTRA_MAKE_FLAGS+=" CC=\"xcrun clang\""
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fi
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if [ -n "$OCDEBUG" ]; then
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EXTRA_MAKE_FLAGS+=" VERBOSE=1"
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fi
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# Must eval here because of the spaces in EXTRA_MAKE_FLAGS.
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eval \
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"OSXCROSS_NO_X86_64H_DEPLOYMENT_TARGET_WARNING=1 \
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$MAKE clang_darwin $EXTRA_MAKE_FLAGS -j $JOBS"
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echo ""
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echo ""
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echo ""
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echo "Please run the following commands by hand to install compiler-rt:"
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echo ""
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echo "mkdir -p ${CLANG_LIB_DIR}/${CLANG_VERSION}/include"
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echo "mkdir -p ${CLANG_LIB_DIR}/${CLANG_VERSION}/lib/darwin"
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echo "cp -r $PWD/include/sanitizer ${CLANG_INCLUDE_DIR}"
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pushd "clang_darwin" &>/dev/null
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function print_install_command() {
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if [ -f "$1" ]; then
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echo "cp $PWD/$1 ${CLANG_DARWIN_LIB_DIR}/$2"
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fi
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}
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print_install_command "osx/libcompiler_rt.a" "libclang_rt.osx.a"
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print_install_command "10.4/libcompiler_rt.a" "libclang_rt.10.4.a"
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print_install_command "eprintf/libcompiler_rt.a" "libclang_rt.eprintf.a"
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print_install_command "cc_kext/libcompiler_rt.a" "libclang_rt.cc_kext.a"
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print_install_command "profile_osx/libcompiler_rt.a" "libclang_rt.profile_osx.a"
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print_install_command "ubsan_osx_dynamic/libcompiler_rt.dylib" \
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"libclang_rt.ubsan_osx_dynamic.dylib"
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print_install_command "asan_osx_dynamic/libcompiler_rt.dylib" \
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"libclang_rt.asan_osx_dynamic.dylib"
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echo ""
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