diff options
-rw-r--r-- | README | 8 | ||||
-rw-r--r-- | patchelf.1 | 6 | ||||
-rw-r--r-- | src/patchelf.cc | 60 | ||||
-rw-r--r-- | tests/Makefile.am | 2 | ||||
-rwxr-xr-x | tests/shrink-rpath-with-allowed-prefixes.sh | 47 |
5 files changed, 107 insertions, 16 deletions
@@ -19,6 +19,14 @@ libraries. In particular, it can do the following: an RPATH "/lib:/usr/lib:/foo/lib", and libfoo.so can only be found in /foo/lib, then the new RPATH will be "/foo/lib". + In addition, the '--allowed-rpath-prefixes' option can be used for + further rpath tuning. For instance, if an executable has an RPATH + "/tmp/build-foo/.libs:/foo/lib", it is probably desirable to keep + the "/foo/lib" reference instead of the "/tmp" entry. To accomplish + that, use: + + $ patchelf --shrink-rpath --allowed-rpath-prefixes /usr/lib:/foo/lib my-program + * Remove declared dependencies on dynamic libraries (DT_NEEDED entries): @@ -53,6 +53,12 @@ For instance, if an executable references one library libfoo.so, has an RPATH "/lib:/usr/lib:/foo/lib", and libfoo.so can only be found in /foo/lib, then the new RPATH will be "/foo/lib". +.IP "--allowed-rpath-prefixes PREFIXES" +Combined with the "--shrink-rpath" option, this can be used for +further rpath tuning. For instance, if an executable has an RPATH +"/tmp/build-foo/.libs:/foo/lib", it is probably desirable to keep +the "/foo/lib" reference instead of the "/tmp" entry. + .IP --print-rpath Prints the RPATH for an executable or library. diff --git a/src/patchelf.cc b/src/patchelf.cc index ca8fb49..a59c12d 100644 --- a/src/patchelf.cc +++ b/src/patchelf.cc @@ -57,6 +57,29 @@ unsigned char * contents = 0; #define ElfFileParamNames Elf_Ehdr, Elf_Phdr, Elf_Shdr, Elf_Addr, Elf_Off, Elf_Dyn, Elf_Sym, Elf_Verneed +static vector<string> splitColonDelimitedString(const char * s){ + vector<string> parts; + const char * pos = s; + while (*pos) { + const char * end = strchr(pos, ':'); + if (!end) end = strchr(pos, 0); + + parts.push_back(string(pos, end - pos)); + if (*end == ':') ++end; + pos = end; + } + + return parts; +} + +static bool hasAllowedPrefix(const string & s, const vector<string> & allowedPrefixes){ + for (vector<string>::const_iterator it = allowedPrefixes.begin(); it != allowedPrefixes.end(); ++it) { + if (!s.compare(0, it->size(), *it)) return true; + } + return false; +} + + static unsigned int getPageSize(){ return pageSize; } @@ -169,7 +192,7 @@ public: typedef enum { rpPrint, rpShrink, rpSet, rpRemove } RPathOp; - void modifyRPath(RPathOp op, string newRPath); + void modifyRPath(RPathOp op, vector<string> allowedRpathPrefixes, string newRPath); void addNeeded(set<string> libs); @@ -1027,7 +1050,7 @@ static void concatToRPath(string & rpath, const string & path) template<ElfFileParams> -void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath) +void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, vector<string> allowedRpathPrefixes, string newRPath) { Elf_Shdr & shdrDynamic = findSection(".dynamic"); @@ -1095,15 +1118,9 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath) newRPath = ""; - char * pos = rpath; - while (*pos) { - char * end = strchr(pos, ':'); - if (!end) end = strchr(pos, 0); - - /* Get the name of the directory. */ - string dirName(pos, end - pos); - if (*end == ':') ++end; - pos = end; + vector<string> rpathDirs = splitColonDelimitedString(rpath); + for (vector<string>::iterator it = rpathDirs.begin(); it != rpathDirs.end(); ++it) { + const string & dirName = *it; /* Non-absolute entries are allowed (e.g., the special "$ORIGIN" hack). */ @@ -1112,6 +1129,13 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath) continue; } + /* If --allowed-rpath-prefixes was given, reject directories + not starting with any of the (colon-delimited) prefixes. */ + if (!allowedRpathPrefixes.empty() && !hasAllowedPrefix(dirName, allowedRpathPrefixes)) { + debug("removing directory '%s' from RPATH because of non-allowed prefix\n", dirName.c_str()); + continue; + } + /* For each library that we haven't found yet, see if it exists in this directory. */ bool libFound = false; @@ -1455,6 +1479,7 @@ static bool setSoname = false; static string newSoname; static string newInterpreter; static bool shrinkRPath = false; +static vector<string> allowedRpathPrefixes; static bool removeRPath = false; static bool setRPath = false; static bool printRPath = false; @@ -1483,14 +1508,14 @@ static void patchElf2(ElfFile & elfFile) elfFile.setInterpreter(newInterpreter); if (printRPath) - elfFile.modifyRPath(elfFile.rpPrint, ""); + elfFile.modifyRPath(elfFile.rpPrint, vector<string>(), ""); if (shrinkRPath) - elfFile.modifyRPath(elfFile.rpShrink, ""); + elfFile.modifyRPath(elfFile.rpShrink, allowedRpathPrefixes, ""); else if (removeRPath) - elfFile.modifyRPath(elfFile.rpRemove, ""); + elfFile.modifyRPath(elfFile.rpRemove, vector<string>(), ""); else if (setRPath) - elfFile.modifyRPath(elfFile.rpSet, newRPath); + elfFile.modifyRPath(elfFile.rpSet, vector<string>(), newRPath); if (printNeeded) elfFile.printNeededLibs(); @@ -1553,6 +1578,7 @@ void showHelp(const string & progName) [--set-rpath RPATH]\n\ [--remove-rpath]\n\ [--shrink-rpath]\n\ + [--allowed-rpath-prefixes PREFIXES]\t\tWith '--shrink-rpath', reject rpath entries not starting with the allowed prefix\n\ [--print-rpath]\n\ [--force-rpath]\n\ [--add-needed LIBRARY]\n\ @@ -1604,6 +1630,10 @@ int main(int argc, char * * argv) else if (arg == "--shrink-rpath") { shrinkRPath = true; } + else if (arg == "--allowed-rpath-prefixes") { + if (++i == argc) error("missing argument"); + allowedRpathPrefixes = splitColonDelimitedString(argv[i]); + } else if (arg == "--set-rpath") { if (++i == argc) error("missing argument"); setRPath = true; diff --git a/tests/Makefile.am b/tests/Makefile.am index 4290fe3..32218e8 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -21,7 +21,7 @@ no_rpath_arch_TESTS = \ src_TESTS = \ plain-fail.sh plain-run.sh shrink-rpath.sh set-interpreter-short.sh \ set-interpreter-long.sh set-rpath.sh no-rpath.sh big-dynstr.sh \ - set-rpath-library.sh soname.sh + set-rpath-library.sh soname.sh shrink-rpath-with-allowed-prefixes.sh build_TESTS = \ $(no_rpath_arch_TESTS) diff --git a/tests/shrink-rpath-with-allowed-prefixes.sh b/tests/shrink-rpath-with-allowed-prefixes.sh new file mode 100755 index 0000000..db24da2 --- /dev/null +++ b/tests/shrink-rpath-with-allowed-prefixes.sh @@ -0,0 +1,47 @@ +#! /bin/sh -e +SCRATCH=scratch/$(basename $0 .sh) + +rm -rf ${SCRATCH} +mkdir -p ${SCRATCH} +mkdir -p ${SCRATCH}/libsA +mkdir -p ${SCRATCH}/libsB + +cp main ${SCRATCH}/ +cp libfoo.so libbar.so ${SCRATCH}/libsA/ +cp libfoo.so libbar.so ${SCRATCH}/libsB/ + +oldRPath=$(../src/patchelf --print-rpath ${SCRATCH}/main) +if test -z "$oldRPath"; then oldRPath="/oops"; fi +pathA="$(pwd)/${SCRATCH}/libsA" +pathB="$(pwd)/${SCRATCH}/libsB" +../src/patchelf --force-rpath --set-rpath $oldRPath:$pathA:$pathB ${SCRATCH}/main + +cp ${SCRATCH}/main ${SCRATCH}/mainA +cp ${SCRATCH}/main ${SCRATCH}/mainB + +../src/patchelf --shrink-rpath ${SCRATCH}/main +../src/patchelf --shrink-rpath --allowed-rpath-prefixes $oldRPath:$pathA ${SCRATCH}/mainA +../src/patchelf --shrink-rpath --allowed-rpath-prefixes $oldRPath:$pathB ${SCRATCH}/mainB + +check() { + exe=$1 + mustContain=$2 + mustNotContain=$3 + + rpath=$(../src/patchelf --print-rpath $exe) + echo "RPATH of $exe after: $rpath" + + if ! echo "$rpath" | grep -q $mustContain; then + echo "RPATH didn't contain '$mustContain' when it should have" + exit 1 + fi + + if echo "$rpath" | grep -q $mustNotContain; then + echo "RPATH contained '$mustNotContain' when it shouldn't have" + exit 1 + fi +} + +check ${SCRATCH}/main $pathA $pathB +check ${SCRATCH}/mainA $pathA $pathB +check ${SCRATCH}/mainB $pathB $pathA |