[PATCH v4] 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 options -P and -h are not 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 takes the restore source as its first
argument, 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

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
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         | 15 +++++++++++++++
 tests/generic/062 |  9 ++-------
 4 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/common/overlay b/common/overlay
index d32f3219..8e89d6e4 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 -
 		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..f3672c1a 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 -
 
 	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 -
 	done
 
 	# ... and in the second loop we delete all the remote attrs to
diff --git a/common/rc b/common/rc
index 106f044a..f5673113 100644
--- a/common/rc
+++ b/common/rc
@@ -132,6 +132,21 @@ _test_fsxattr_xflag()
 	grep -q "fsxattr.xflags.*\[.*$2.*\]" <($XFS_IO_PROG -c "stat -v" "$1")
 }
 
+# Restore xattrs from a getfattr-style dump given as $1 (a dump file, or "-"
+# for stdin); any extra setfattr options follow.  attr 2.6.0 (CVE-2026-54371)
+# makes --restore warn unless both -P and -h are given, so filter out just
+# those warning lines, keep other unexpected stderr.
+_setfattr_restore()
+{
+	local restore_from="$1"
+	shift
+
+	$SETFATTR_PROG "$@" --restore="$restore_from" 2> $tmp.setfattr
+	local ret=$?
+	sed -e '/--restore=.*unsafe.*without/d' "$tmp.setfattr" 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 ddf0a478..845d62f2 100755
--- a/tests/generic/062
+++ b/tests/generic/062
@@ -30,12 +30,7 @@ getfattr()
 
 setfattr()
 {
-    # attr >= 2.6.0 (CVE-2026-54371 fix) warns that "setfattr --restore" without
-    # -P/--physical is unsafe because it can traverse symlinks. Older attr does
-    # not accept -P, so just filter the warning to stay version-agnostic.
-    $SETFATTR_PROG $@ 2>&1 | \
-        sed -e '/^Warning: option --restore=file is unsafe without option/d' | \
-        _filter_scratch
+    $SETFATTR_PROG $@ 2>&1 | _filter_scratch
 }
 
 _create_test_bed()
@@ -191,7 +186,7 @@ _create_test_bed
 _extend_test_bed
 
 echo "*** restore everything"
-setfattr -h --restore=$tmp.backup1
+_setfattr_restore "$tmp.backup1" -h 2>&1 | _filter_scratch
 _backup $tmp.backup2
 
 echo "AFTER RESTORE" >>$seqres.full
-- 
2.55.0