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#!/bin/bash
has() {
f=$1
shift
[[ "${@/$f/}" != "$@" ]] && return 0
return 1
}
paxmarksh() {
local f # loop over paxables
local flags # pax flags
local ret=0 # overal return code of this function
# Only the actual PaX flags and z are accepted
# 1. The leading '-' is optional
# 2. -C -c only make sense for paxctl, but are unnecessary
# because we progressively do -q -qc -qC
# 3. z is allowed for the default
flags="${1//[!zPpEeMmRrSs]}"
[[ "${flags}" ]] || return 0
shift
# z = default. For XATTR_PAX, the default is no xattr field at all
local dodefault=""
[[ "${flags//[!z]}" ]] && dodefault="yes"
if has PT ${PAX_MARKINGS}; then
for f in "$@"; do
#First try paxctl -> this might try to create/convert program headers
if type -p paxctl > /dev/null; then
# First, try modifying the existing PAX_FLAGS header
paxctl -q${flags} "${f}" >/dev/null 2>&1 && continue
# Second, try creating a PT_PAX header (works on ET_EXEC)
# Even though this is less safe, most exes need it, eg bug #463170
paxctl -qC${flags} "${f}" >/dev/null 2>&1 && continue
# Third, try stealing the (unused under PaX) PT_GNU_STACK header
paxctl -qc${flags} "${f}" >/dev/null 2>&1 && continue
fi
#Next try paxctl-ng -> this will not create/convert any program headers
if type -p paxctl-ng > /dev/null && paxctl-ng -L ; then
flags="${flags//z}"
[[ ${dodefault} == "yes" ]] && paxctl-ng -L -z "${f}" >/dev/null 2>&1
[[ "${flags}" ]] || continue
paxctl-ng -L -${flags} "${f}" >/dev/null 2>&1 && continue
fi
#Finally fall back on scanelf
if type -p scanelf > /dev/null && [[ ${PAX_MARKINGS} != "none" ]]; then
scanelf -Xxz ${flags} "$f" >/dev/null 2>&1
#We failed to set PT_PAX flags
elif [[ ${PAX_MARKINGS} != "none" ]]; then
ret=1
fi
done
fi
if has XT ${PAX_MARKINGS}; then
flags="${flags//z}"
for f in "$@"; do
#First try paxctl-ng
if type -p paxctl-ng > /dev/null && paxctl-ng -l ; then
[[ ${dodefault} == "yes" ]] && paxctl-ng -d "${f}" >/dev/null 2>&1
[[ "${flags}" ]] || continue
paxctl-ng -l -${flags} "${f}" >/dev/null 2>&1 && continue
fi
#Next try setfattr
if type -p setfattr > /dev/null; then
[[ "${flags//[!Ee]}" ]] || flags+="e" # bug 447150
[[ ${dodefault} == "yes" ]] && setfattr -x "user.pax.flags" "${f}" >/dev/null 2>&1
setfattr -n "user.pax.flags" -v "${flags}" "${f}" >/dev/null 2>&1 && continue
fi
#We failed to set XATTR_PAX flags
if [[ ${PAX_MARKINGS} != "none" ]]; then
ret=1
fi
done
fi
return ${ret}
}
if command -v portageq >/dev/null; then
PAX_MARKINGS="$(portageq envvar PAX_MARKINGS)"
fi
if [[ -z ${PAX_MARKINGS} ]]; then
MAKE_CONF="/etc/portage/make.conf"
if [[ -d ${MAKE_CONF} ]]; then
for MC in "${MAKE_CONF}"/*; do
source "${MC}"
done
elif [[ -r ${MAKE_CONF} ]]; then
source "${MAKE_CONF}"
fi
fi
: "${PAX_MARKINGS:="none"}"
paxmarksh "$@"
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