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kpatch-build: do not assume that TEMPDIR is unexported on entry to script 

The user's environment might have TEMPDIR exported.  If so, then kpatch-build
dies with a bogus "invalid ancestor" error. If you turn those bogus errors into
warnings, then the script goes on to incorrectly put into the generated .ko file
every single function that was compiled in the *original* kernel build, thereby
producing an immense .ko file with more than 64k sections that the linux kernel
cannot load.  This fix makes sure that TEMPDIR is unexported on the build of the
original kernel.  Actually, this fix uses a separate KPATCH_GCC_TEMPDIR variable,
so that if the kernel build is interrupted, the cleanup function in the kpatch-kbuild
script will still have TEMPDIR set correctly.

Signed-off-by: Martin Carroll <martin.carroll@alcatel-lucent.com>
This commit is contained in:
Martin Carroll 2016-07-22 09:30:11 -04:00
parent 649764db02
commit 145d1289dc
2 changed files with 9 additions and 7 deletions
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4
kpatch-build/kpatch-build
View File

@ -495,12 +495,14 @@ done
echo "Building original kernel"
./scripts/setlocalversion --save-scmversion || die
make mrproper >> "$LOGFILE" 2>&1 || die
unset KPATCH_GCC_TEMPDIR
CROSS_COMPILE="$TOOLSDIR/kpatch-gcc " make "-j$CPUS" $TARGETS "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
echo "Building patched kernel"
patch -N -p1 < "$APPLIEDPATCHFILE" >> "$LOGFILE" 2>&1 || die
mkdir -p "$TEMPDIR/orig" "$TEMPDIR/patched"
export TEMPDIR
KPATCH_GCC_TEMPDIR=$TEMPDIR
export KPATCH_GCC_TEMPDIR
# TODO: remove custom LDFLAGS and ugly "undefined reference" grep when core
# module gets moved to the kernel tree
CROSS_COMPILE="$TOOLSDIR/kpatch-gcc " \

12
kpatch-build/kpatch-gcc
View File

@ -5,7 +5,7 @@ set -x
TOOLCHAINCMD="$1"
shift
if [[ -z "$TEMPDIR" ]]; then
if [[ -z "$KPATCH_GCC_TEMPDIR" ]]; then
exec "$TOOLCHAINCMD" "$@"
fi
@ -36,9 +36,9 @@ if [[ "$TOOLCHAINCMD" = "gcc" ]] ; then
break
;;
*.o)
mkdir -p "$TEMPDIR/orig/$(dirname $obj)"
[[ -e $obj ]] && cp -f "$obj" "$TEMPDIR/orig/$obj"
echo "$obj" >> "$TEMPDIR/changed_objs"
mkdir -p "$KPATCH_GCC_TEMPDIR/orig/$(dirname $obj)"
[[ -e $obj ]] && cp -f "$obj" "$KPATCH_GCC_TEMPDIR/orig/$obj"
echo "$obj" >> "$KPATCH_GCC_TEMPDIR/changed_objs"
break
;;
*)
@ -54,8 +54,8 @@ elif [[ "$TOOLCHAINCMD" = "ld" ]] ; then
obj=$2
case "$obj" in
*.ko)
mkdir -p "$TEMPDIR/module/$(dirname $obj)"
cp -f "$obj" "$TEMPDIR/module/$obj"
mkdir -p "$KPATCH_GCC_TEMPDIR/module/$(dirname $obj)"
cp -f "$obj" "$KPATCH_GCC_TEMPDIR/module/$obj"
break
;;
*)