strip kernel modules more aggressively: make all global symbols local, rename all...

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30662 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/rules.mk b/rules.mk
index 474c0e2..79a2a9f 100644 (file)
--- a/rules.mk
+++ b/rules.mk
@@ -219,9 +219,10 @@ else
     endif
   endif
   RSTRIP:= \
     endif
   endif
   RSTRIP:= \

+    export CROSS="$(TARGET_CROSS)"; \

     NM="$(TARGET_CROSS)nm" \
     STRIP="$(STRIP)" \
     NM="$(TARGET_CROSS)nm" \
     STRIP="$(STRIP)" \

-    STRIP_KMOD="$(TARGET_CROSS)strip --strip-unneeded -R .comment -R .pdr -R .mdebug.abi32 -R .note.gnu.build-id -R .gnu.attributes -R .reginfo -x" \
+    STRIP_KMOD="$(SCRIPT_DIR)/strip-kmod.sh" \

     $(SCRIPT_DIR)/rstrip.sh
 endif
 
     $(SCRIPT_DIR)/rstrip.sh
 endif
 

diff --git a/scripts/rstrip.sh b/scripts/rstrip.sh
index e42caa5..4665ff5 100755 (executable)
--- a/scripts/rstrip.sh
+++ b/scripts/rstrip.sh
@@ -5,25 +5,6 @@
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
 #

-
-find_modparams() {
-       FILE="$1"
-       $NM "$FILE" | awk '
-BEGIN {
-       FS=" "
-}
-($3 ~ /^__module_parm_/) && ($3 !~ /^__module_parm_desc/) {
-       gsub(/__module_parm_/, "", $3)
-       printf "-K " $3 " "
-}
-($2 ~ /r/) && ($3 ~ /__param_/) {
-       gsub(/__param_/, "", $3)
-       printf "-K " $3 " "
-}
-'
-}
-
-

 SELF=${0##*/}
 
 [ -z "$STRIP" ] && {
 SELF=${0##*/}
 
 [ -z "$STRIP" ] && {


@@ -46,7 +27,7 @@ find $TARGETS -type f -a -exec file {} \; | \
   while read F S; do
     echo "$SELF: $F:$S"
        [ "${S}" = "relocatable" ] && {
   while read F S; do
     echo "$SELF: $F:$S"
        [ "${S}" = "relocatable" ] && {

-               eval "$STRIP_KMOD -w -K '__param*' -K '__mod*' $(find_modparams "$F")$F"
+               eval "$STRIP_KMOD $F"

        } || {
                b=$(stat -c '%a' $F)
                eval "$STRIP $F"
        } || {
                b=$(stat -c '%a' $F)
                eval "$STRIP $F"

diff --git a/scripts/strip-kmod.sh b/scripts/strip-kmod.sh
new file mode 100755 (executable)
index 0000000..68da9e9
--- /dev/null
+++ b/scripts/strip-kmod.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+[ -n "$CROSS" ] || {
+       echo "The variable CROSS must be set to point to the cross-compiler prefix"
+       exit 1
+}
+
+MODULE="$1"
+
+[ "$#" -ne 1 ] && {
+       echo "Usage: $0 <module>"
+       exit 1
+}
+
+${CROSS}objcopy \
+       --strip-unneeded \
+       -R .comment \
+       -R .pdr \
+       -R .mdebug.abi32 \
+       -R .note.gnu.build-id \
+       -R .gnu.attributes \
+       -R .reginfo \
+       -G __this_module \
+       -x "$MODULE" "$MODULE.tmp"
+
+${CROSS}nm "$MODULE.tmp" | awk '
+BEGIN {
+       n = 0
+}
+
+$3 && $2 ~ /[brtd]/ && $3 !~ /\$LC/ {
+       print "--redefine-sym "$3"=_"n;
+       n = n + 1
+}
+' > "$MODULE.tmp1"
+
+${CROSS}objcopy `cat ${MODULE}.tmp1` ${MODULE}.tmp ${MODULE}.out
+mv "${MODULE}.out" "${MODULE}"
+rm -f "${MODULE}".t*