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oss-fuzz: Add very verbose explaination for RPATH vs RUNPATH

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Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

Autobuild-User(master): Douglas Bagnall <dbagnall@samba.org>
Autobuild-Date(master): Fri Oct 23 00:33:57 UTC 2020 on sn-devel-184
This commit is contained in:
Andrew Bartlett 2020-10-23 10:06:20 +13:00 committed by Douglas Bagnall
parent a57702db1d
commit 8f66ce0a3d
1 changed files with 140 additions and 3 deletions
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143
lib/fuzzing/oss-fuzz/do_build.sh
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@ -88,9 +88,146 @@ make -j
# Make a directory for the system shared libraries to be copied into
mkdir -p $OUT/lib
# We can't static link to all the system libs with waf, so copy them
# to $OUT/lib and set the rpath to point there. This is similar to how
# firefox handles this.
# oss-fuzz would prefer for all the binaries put into $OUT to be
# statically linked.
#
# We can't static link to all the system libs with waf, so copy the
# libraries we need to $OUT/lib and set the rpath to point there.
# This is similar to how firefox handles this.
#
# NOTE on RPATH vs RUNPATH:
#
# RUNPATH appears to be the more modern version, and so modern ld.bfd
# and ld.gold only set RUNPATH. RUNPATH makes sense on most systems,
# but not for our hack.
#
# If we use RUNPATH, we can get an error like this:
# Step #6: Error occured while running fuzz_nmblib_parse_packet:
# Step #6: /workspace/out/coverage/fuzz_nmblib_parse_packet: error while loading shared libraries: libavahi-common.so.3: cannot open shared object file: No such file or directory
#
# This is because the full contents of $OUT are copied to yet another
# host, which otherwise does not have much of linux at all. oss-fuzz
# prefers a static binary because that will 'just work', but we can't
# do that, so we need to use linker tricks.
#
# If the linker used RUNPATH (eg ld.bfd on Ubuntu 18.04 and later, ld.gold):
# * bin=fuzz_nmblib_parse_packet
# * OUT=/tmp/3/b12207/prefix/samba-fuzz
# * chrpath -r '$ORIGIN/lib' $OUT/$bin'
# * ldd $OUT/$bin
# linux-vdso.so.1 (0x00007ffd4b7a5000)
# libasan.so.5 => /tmp/3/b12207/prefix/samba-fuzz/lib/libasan.so.5 (0x00007ff25bdd0000)
# libldap_r-2.4.so.2 => /tmp/3/b12207/prefix/samba-fuzz/lib/libldap_r-2.4.so.2 (0x00007ff25bd7a000)
# liblber-2.4.so.2 => /tmp/3/b12207/prefix/samba-fuzz/lib/liblber-2.4.so.2 (0x00007ff25bd69000)
# libunwind-x86_64.so.8 => /tmp/3/b12207/prefix/samba-fuzz/lib/libunwind-x86_64.so.8 (0x00007ff25bd47000)
# libunwind.so.8 => /tmp/3/b12207/prefix/samba-fuzz/lib/libunwind.so.8 (0x00007ff25bd2a000)
# libgnutls.so.30 => /tmp/3/b12207/prefix/samba-fuzz/lib/libgnutls.so.30 (0x00007ff25bb54000)
# libdl.so.2 => /tmp/3/b12207/prefix/samba-fuzz/lib/libdl.so.2 (0x00007ff25bb4c000)
# libz.so.1 => /tmp/3/b12207/prefix/samba-fuzz/lib/libz.so.1 (0x00007ff25bb30000)
# libjansson.so.4 => /tmp/3/b12207/prefix/samba-fuzz/lib/libjansson.so.4 (0x00007ff25bb21000)
# libresolv.so.2 => /tmp/3/b12207/prefix/samba-fuzz/lib/libresolv.so.2 (0x00007ff25bb05000)
# libsystemd.so.0 => /tmp/3/b12207/prefix/samba-fuzz/lib/libsystemd.so.0 (0x00007ff25ba58000)
# libpthread.so.0 => /tmp/3/b12207/prefix/samba-fuzz/lib/libpthread.so.0 (0x00007ff25ba35000)
# libicuuc.so.66 => /tmp/3/b12207/prefix/samba-fuzz/lib/libicuuc.so.66 (0x00007ff25b84d000)
# libicui18n.so.66 => /tmp/3/b12207/prefix/samba-fuzz/lib/libicui18n.so.66 (0x00007ff25b54e000)
# libcap.so.2 => /tmp/3/b12207/prefix/samba-fuzz/lib/libcap.so.2 (0x00007ff25b545000)
# libbsd.so.0 => /tmp/3/b12207/prefix/samba-fuzz/lib/libbsd.so.0 (0x00007ff25b52b000)
# libnsl.so.1 => /tmp/3/b12207/prefix/samba-fuzz/lib/libnsl.so.1 (0x00007ff25b50e000)
# libc.so.6 => /tmp/3/b12207/prefix/samba-fuzz/lib/libc.so.6 (0x00007ff25b31c000)
# librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007ff25b2f2000)
# libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff25b1a3000)
# libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff25b188000)
# libsasl2.so.2 => /usr/lib/x86_64-linux-gnu/libsasl2.so.2 (0x00007ff25b16b000)
# libgssapi.so.3 => /usr/lib/x86_64-linux-gnu/libgssapi.so.3 (0x00007ff25b126000)
# liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007ff25b0fd000)
# /lib64/ld-linux-x86-64.so.2 (0x00007ff25ea0c000)
# libp11-kit.so.0 => /usr/lib/x86_64-linux-gnu/libp11-kit.so.0 (0x00007ff25afc5000)
# libidn2.so.0 => /usr/lib/x86_64-linux-gnu/libidn2.so.0 (0x00007ff25afa4000)
# libunistring.so.2 => /usr/lib/x86_64-linux-gnu/libunistring.so.2 (0x00007ff25ae22000)
# libtasn1.so.6 => /usr/lib/x86_64-linux-gnu/libtasn1.so.6 (0x00007ff25ae0c000)
# libnettle.so.7 => /usr/lib/x86_64-linux-gnu/libnettle.so.7 (0x00007ff25add2000)
# libhogweed.so.5 => /usr/lib/x86_64-linux-gnu/libhogweed.so.5 (0x00007ff25ad9a000)
# libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007ff25ad14000)
# liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007ff25acf3000)
# libgcrypt.so.20 => /usr/lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007ff25abd5000)
# libicudata.so.66 => /usr/lib/x86_64-linux-gnu/libicudata.so.66 (0x00007ff259114000)
# libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff258f33000)
# libheimntlm.so.0 => /usr/lib/x86_64-linux-gnu/libheimntlm.so.0 (0x00007ff258f25000)
# libkrb5.so.26 => /usr/lib/x86_64-linux-gnu/libkrb5.so.26 (0x00007ff258e92000)
# libasn1.so.8 => /usr/lib/x86_64-linux-gnu/libasn1.so.8 (0x00007ff258deb000)
# libcom_err.so.2 => /lib/x86_64-linux-gnu/libcom_err.so.2 (0x00007ff258de4000)
# libhcrypto.so.4 => /usr/lib/x86_64-linux-gnu/libhcrypto.so.4 (0x00007ff258dac000)
# libroken.so.18 => /usr/lib/x86_64-linux-gnu/libroken.so.18 (0x00007ff258d93000)
# libffi.so.7 => /usr/lib/x86_64-linux-gnu/libffi.so.7 (0x00007ff258d85000)
# libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007ff258d62000)
# libwind.so.0 => /usr/lib/x86_64-linux-gnu/libwind.so.0 (0x00007ff258d38000)
# libheimbase.so.1 => /usr/lib/x86_64-linux-gnu/libheimbase.so.1 (0x00007ff258d26000)
# libhx509.so.5 => /usr/lib/x86_64-linux-gnu/libhx509.so.5 (0x00007ff258cd8000)
# libsqlite3.so.0 => /usr/lib/x86_64-linux-gnu/libsqlite3.so.0 (0x00007ff258bad000)
# libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007ff258b72000)
#
# Note how all the dependencies of libc and gnutls are not forced to
# $OUT/lib (via the magic $ORIGIN variable, meaning the directory of
# the binary). These will not be found on the target system!
#
# If the linker used RPATH however
# * bin=fuzz_nmblib_parse_packet
# * OUT=/tmp/3/b22/prefix/samba-fuzz
# * chrpath -r '$ORIGIN/lib' $OUT/$bin'
# * ldd $OUT/$bin
# linux-vdso.so.1 => (0x00007ffef85c7000)
# libasan.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libasan.so.2 (0x00007f3668b4f000)
# libldap_r-2.4.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libldap_r-2.4.so.2 (0x00007f36688fe000)
# liblber-2.4.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/liblber-2.4.so.2 (0x00007f36686ef000)
# libunwind-x86_64.so.8 => /tmp/3/b22/prefix/samba-fuzz/lib/libunwind-x86_64.so.8 (0x00007f36684d0000)
# libunwind.so.8 => /tmp/3/b22/prefix/samba-fuzz/lib/libunwind.so.8 (0x00007f36682b5000)
# libgnutls.so.30 => /tmp/3/b22/prefix/samba-fuzz/lib/libgnutls.so.30 (0x00007f3667f85000)
# libdl.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libdl.so.2 (0x00007f3667d81000)
# libz.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libz.so.1 (0x00007f3667b67000)
# libjansson.so.4 => /tmp/3/b22/prefix/samba-fuzz/lib/libjansson.so.4 (0x00007f366795a000)
# libresolv.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libresolv.so.2 (0x00007f366773f000)
# libsystemd.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libsystemd.so.0 (0x00007f366be2f000)
# libpthread.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libpthread.so.0 (0x00007f3667522000)
# libicuuc.so.55 => /tmp/3/b22/prefix/samba-fuzz/lib/libicuuc.so.55 (0x00007f366718e000)
# libicui18n.so.55 => /tmp/3/b22/prefix/samba-fuzz/lib/libicui18n.so.55 (0x00007f3666d2c000)
# libcap.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libcap.so.2 (0x00007f3666b26000)
# libbsd.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libbsd.so.0 (0x00007f3666911000)
# libnsl.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libnsl.so.1 (0x00007f36666f8000)
# libc.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libc.so.6 (0x00007f366632e000)
# libm.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libm.so.6 (0x00007f3666025000)
# libgcc_s.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libgcc_s.so.1 (0x00007f3665e0f000)
# libsasl2.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libsasl2.so.2 (0x00007f3665bf4000)
# libgssapi.so.3 => /tmp/3/b22/prefix/samba-fuzz/lib/libgssapi.so.3 (0x00007f36659b3000)
# liblzma.so.5 => /tmp/3/b22/prefix/samba-fuzz/lib/liblzma.so.5 (0x00007f3665791000)
# /lib64/ld-linux-x86-64.so.2 (0x00007f366bc93000)
# libp11-kit.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libp11-kit.so.0 (0x00007f366552d000)
# libidn.so.11 => /tmp/3/b22/prefix/samba-fuzz/lib/libidn.so.11 (0x00007f36652fa000)
# libtasn1.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libtasn1.so.6 (0x00007f36650e7000)
# libnettle.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libnettle.so.6 (0x00007f3664eb1000)
# libhogweed.so.4 => /tmp/3/b22/prefix/samba-fuzz/lib/libhogweed.so.4 (0x00007f3664c7e000)
# libgmp.so.10 => /tmp/3/b22/prefix/samba-fuzz/lib/libgmp.so.10 (0x00007f36649fe000)
# libselinux.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libselinux.so.1 (0x00007f36647dc000)
# librt.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/librt.so.1 (0x00007f36645d4000)
# libgcrypt.so.20 => /tmp/3/b22/prefix/samba-fuzz/lib/libgcrypt.so.20 (0x00007f36642f3000)
# libicudata.so.55 => /tmp/3/b22/prefix/samba-fuzz/lib/libicudata.so.55 (0x00007f366283c000)
# libstdc++.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libstdc++.so.6 (0x00007f36624ba000)
# libheimntlm.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libheimntlm.so.0 (0x00007f36622b1000)
# libkrb5.so.26 => /tmp/3/b22/prefix/samba-fuzz/lib/libkrb5.so.26 (0x00007f3662027000)
# libasn1.so.8 => /tmp/3/b22/prefix/samba-fuzz/lib/libasn1.so.8 (0x00007f3661d85000)
# libcom_err.so.2 => /tmp/3/b22/prefix/samba-fuzz/lib/libcom_err.so.2 (0x00007f3661b81000)
# libhcrypto.so.4 => /tmp/3/b22/prefix/samba-fuzz/lib/libhcrypto.so.4 (0x00007f366194e000)
# libroken.so.18 => /tmp/3/b22/prefix/samba-fuzz/lib/libroken.so.18 (0x00007f3661738000)
# libffi.so.6 => /tmp/3/b22/prefix/samba-fuzz/lib/libffi.so.6 (0x00007f3661530000)
# libpcre.so.3 => /tmp/3/b22/prefix/samba-fuzz/lib/libpcre.so.3 (0x00007f36612c0000)
# libgpg-error.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libgpg-error.so.0 (0x00007f36610ac000)
# libwind.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libwind.so.0 (0x00007f3660e83000)
# libheimbase.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libheimbase.so.1 (0x00007f3660c74000)
# libhx509.so.5 => /tmp/3/b22/prefix/samba-fuzz/lib/libhx509.so.5 (0x00007f3660a29000)
# libsqlite3.so.0 => /tmp/3/b22/prefix/samba-fuzz/lib/libsqlite3.so.0 (0x00007f3660754000)
# libcrypt.so.1 => /tmp/3/b22/prefix/samba-fuzz/lib/libcrypt.so.1 (0x00007f366051c000)
#
# See how the runtime linker seems to honour the RPATH for
# dependencies of dependencies in this case. This helps us us lot.
for x in bin/fuzz_*
do