[PATCH v2] common: strip attr 2.6.0 --restore safety warnings

[Avinesh Kumar <avinesh.kumar@suse.com>]

From: Avinesh Kumar <avinesh.kumar@suse.com>

attr 2.6.0 (CVE-2026-54371 hardening) makes "setfattr --restore" print a
warning to stderr when neither -P nor -h is given, claiming it may
traverse or dereference symlinks in the dump's pathnames [0]. This warning
leaks into test output and breaks generic/062 and xfs/083 (via
_scratch_populate).

Add a _setfattr_restore helper that runs "setfattr --restore", filters
out just the expected warning line, and preserves any other (unexpected)
stderr. Convert the callers in common/populate, common/overlay and
generic/062 to use it.

[0] https://cgit.git.savannah.nongnu.org/cgit/attr.git/commit/?id=3fb06b9ba314d37035d0877e6de313de754f1ac8

Suggested-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Avinesh Kumar <avinesh.kumar@suse.com>
---
 common/overlay    | 2 +-
 common/populate   | 4 ++--
 common/rc         | 8 ++++++++
 tests/generic/062 | 2 +-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/common/overlay b/common/overlay
index d32f3219..73841dd7 100644
--- a/common/overlay
+++ b/common/overlay
@@ -494,7 +494,7 @@ _overlay_trusted_to_user()
 	local dir=$1
 
 	for file in `find $dir`; do
-		_getfattr --absolute-names -d -m '^trusted.overlay.(redirect|metacopy)$' $file  | sed 's/^trusted/user/' | $SETFATTR_PROG --restore=-
+		_getfattr --absolute-names -d -m '^trusted.overlay.(redirect|metacopy)$' $file  | sed 's/^trusted/user/' | _setfattr_restore --restore=-
 		for xattr in `_getfattr --absolute-names -d -m '^trusted.overlay.' $file  | tail -n +2 | cut -d= -f1`; do
 			$SETFATTR_PROG -x $xattr $file;
 		done
diff --git a/common/populate b/common/populate
index 1c0dd03e..f7fcd0c3 100644
--- a/common/populate
+++ b/common/populate
@@ -151,7 +151,7 @@ __populate_create_attr() {
 		echo "# file: ${name}";
 		seq --format "user.%08g=\"abcdefgh\"" 0 "${nr}"
 		echo
-	) | setfattr --restore -
+	) | _setfattr_restore --restore=-
 
 	test -z "${missing}" && return
 	seq 1 2 "${nr}" | while read d; do
@@ -200,7 +200,7 @@ __populate_xfs_create_btree_attr() {
 			seq --format "user.%08g=\"abcdefgh\"" "${nr}" "$((nr + incr + 1))"
 			echo "user.v$(printf "%.08d" "$nr")=\"${bigval}\""
 			echo
-		) | setfattr --restore -
+		) | _setfattr_restore --restore=-
 	done
 
 	# ... and in the second loop we delete all the remote attrs to
diff --git a/common/rc b/common/rc
index 79189e7e..6234a580 100644
--- a/common/rc
+++ b/common/rc
@@ -132,6 +132,14 @@ _test_fsxattr_xflag()
 	grep -q "fsxattr.xflags.*\[.*$2.*\]" <($XFS_IO_PROG -c "stat -v" "$1")
 }
 
+_setfattr_restore()
+{
+	$SETFATTR_PROG "$@" 2> $tmp.setfattr.$$
+	local ret=$?
+	cat $tmp.setfattr.$$ | sed -e '/--restore=.*unsafe.*without/d' 1>&2
+	return $ret
+}
+
 # This test requires extsize support on the  filesystem
 _require_scratch_extsize()
 {
diff --git a/tests/generic/062 b/tests/generic/062
index 89659040..3ef96da1 100755
--- a/tests/generic/062
+++ b/tests/generic/062
@@ -186,7 +186,7 @@ _create_test_bed
 _extend_test_bed
 
 echo "*** restore everything"
-setfattr -h --restore=$tmp.backup1
+_setfattr_restore -h --restore=$tmp.backup1 2>&1 | _filter_scratch
 _backup $tmp.backup2
 
 echo "AFTER RESTORE" >>$seqres.full
-- 
2.54.0