openwrtv3/scripts/bundle-libraries.sh
Jo-Philipp Wich 9030a78a71 scripts: bundle-libraries: prevent loading host locales (FS#1803)
Binary patch the bundled glibc library to inhibit loading of host locale
archives in order to avoid triggering internal libc assertions when
invoking shipped, bundled executables.

The problem has been solved with upstream Glibc commit
0062ace229 ("Gracefully handle incompatible locale data") but we still
need to deal with older Glibc binaries for some time to come.

Fixes FS#1803
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2018-08-27 12:51:07 +02:00

196 lines
4.2 KiB
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#!/usr/bin/env bash
#
# Script to install host system binaries along with required libraries.
#
# Copyright (C) 2012-2017 Jo-Philipp Wich <jo@mein.io>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
DIR="$1"; shift
_cp() {
cp ${VERBOSE:+-v} -L "$1" "$2" || {
echo "cp($1 $2) failed" >&2
exit 1
}
}
_mv() {
mv ${VERBOSE:+-v} "$1" "$2" || {
echo "mv($1 $2) failed" >&2
exit 1
}
}
_md() {
mkdir ${VERBOSE:+-v} -p "$1" || {
echo "mkdir($1) failed" >&2
exit 2
}
}
_ln() {
ln ${VERBOSE:+-v} -sf "$1" "$2" || {
echo "ln($1 $2) failed" >&2
exit 3
}
}
_relpath() {
local base="$(readlink -f "$1")"
local dest="$(readlink -f "$2")"
local up
[ -d "$base" ] || base="${base%/*}"
[ -d "$dest" ] || dest="${dest%/*}"
while true; do
case "$base"
in "$dest"/*)
echo "$up/${base#$dest/}"
break
;;
*)
dest="${dest%/*}"
up="${up:+$up/}.."
;;
esac
done
}
_runas_so() {
cat <<-EOT | ${CC:-gcc} -x c -fPIC -shared -o "$1" -
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int mangle_arg0(int argc, char **argv, char **env) {
char *arg0 = getenv("RUNAS_ARG0");
if (arg0) {
argv[0] = arg0;
unsetenv("RUNAS_ARG0");
}
return 0;
}
#ifdef __APPLE__
__attribute__((section("__DATA,__mod_init_func")))
#else
__attribute__((section(".init_array")))
#endif
static void *mangle_arg0_constructor = &mangle_arg0;
EOT
[ -x "$1" ] || {
echo "compiling preload library failed" >&2
exit 5
}
}
_patch_ldso() {
_cp "$1" "$1.patched"
sed -i -e 's,/\(usr\|lib\|etc\)/,/###/,g' "$1.patched"
if "$1.patched" 2>&1 | grep -q -- --library-path; then
_mv "$1.patched" "$1"
else
echo "binary patched ${1##*/} not executable, using original" >&2
rm -f "$1.patched"
fi
}
_patch_glibc() {
_cp "$1" "$1.patched"
sed -i -e 's,/usr/\(\(lib\|share\)/locale\),/###/\1,g' "$1.patched"
if "$1.patched" 2>&1 | grep -q -- GNU; then
_mv "$1.patched" "$1"
else
echo "binary patched ${1##*/} not executable, using original" >&2
rm -f "$1.patched"
fi
}
for LDD in ${PATH//://ldd }/ldd; do
"$LDD" --version >/dev/null 2>/dev/null && break
LDD=""
done
[ -n "$LDD" -a -x "$LDD" ] || LDD=
for BIN in "$@"; do
[ -n "$BIN" -a -n "$DIR" ] || {
echo "Usage: $0 <destdir> <executable> ..." >&2
exit 1
}
[ ! -d "$DIR/lib" ] && {
_md "$DIR/lib"
_md "$DIR/usr"
_ln "../lib" "$DIR/usr/lib"
}
[ ! -x "$DIR/lib/runas.so" ] && {
_runas_so "$DIR/lib/runas.so"
}
LDSO=""
[ -n "$LDD" ] && [ -x "$BIN" ] && file "$BIN" | grep -sqE "ELF.*(executable|interpreter)" && {
for token in $("$LDD" "$BIN" 2>/dev/null); do
case "$token" in */*.so*)
dest="$DIR/lib/${token##*/}"
ddir="${dest%/*}"
[ -f "$token" -a ! -f "$dest" ] && {
_md "$ddir"
_cp "$token" "$dest"
case "$token" in
*ld-*.so*)
LDSO="${token##*/}"
_patch_ldso "$dest"
;;
libc.so.6|*/libc.so.6)
_patch_glibc "$dest"
;;
esac
}
;; esac
done
}
# is a dynamically linked executable
if [ -n "$LDSO" ]; then
echo "Bundling ${BIN##*/}"
RUNDIR="$(readlink -f "$BIN")"; RUNDIR="${RUNDIR%/*}"
RUN="${LDSO#ld-}"; RUN="run-${RUN%%.so*}.sh"
REL="$(_relpath "$DIR/lib" "$BIN")"
_mv "$BIN" "$RUNDIR/.${BIN##*/}.bin"
cat <<-EOF > "$BIN"
#!/usr/bin/env bash
dir="\$(dirname "\$0")"
export RUNAS_ARG0="\$0"
export LD_PRELOAD="\$dir/${REL:+$REL/}runas.so"
exec "\$dir/${REL:+$REL/}$LDSO" --library-path "\$dir/${REL:+$REL/}" "\$dir/.${BIN##*/}.bin" "\$@"
EOF
chmod ${VERBOSE:+-v} 0755 "$BIN"
fi
done