This tests the fs.protected_regular and fs.protected_fifos
sysctls which restrict access behavior in sticky world-writable
directories as documented in the kernel at
Documentation/admin-guide/sysctl/fs.rst
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
V2: Don't count on nonzero exit from xfs_io since that is almost
always broken and was only recently fixed and may end up broken
again... collect & check any emitted error messages instead.
diff --git a/tests/generic/901 b/tests/generic/901
new file mode 100755
index 00000000..9bb658e0
--- /dev/null
+++ b/tests/generic/901
@@ -0,0 +1,133 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 YOUR NAME HERE. All Rights Reserved.
+#
+# FS QA Test 900
+#
+# Test protected_symlink and protected_hardlink ioctls
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ rm -rf $TEST_DIR/$seq
+ sysctl -qw fs.protected_regular=$REGULAR_PROTECTION
+ sysctl -qw fs.protected_fifos=$FIFO_PROTECTION
+ cd /
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_test
+_require_sysctl fs.protected_regular
+_require_sysctl fs.protected_fifos
+_require_user fsgqa
+_require_user fsgqa2
+
+USER1=fsgqa
+USER2=fsgqa2
+
+# Save current system state to reset when done
+REGULAR_PROTECTION=`sysctl -n fs.protected_regular`
+FIFO_PROTECTION=`sysctl -n fs.protected_fifos`
+
+test_access()
+{
+ FILENAME=$1
+
+ # sticky dir is world & group writable:
+ echo "= group & world writable dir"
+ chmod og+w $TEST_DIR/$seq/sticky_dir
+ # "open -f" opens O_CREAT
+ result=`sudo -u $USER2 $XFS_IO_PROG -c "open -f $TEST_DIR/$seq/sticky_dir/$FILENAME" 2>&1`
+ if [ -z "$result" ]; then
+ echo "successfully opened $FILENAME"
+ else
+ echo $result | _filter_test_dir
+ fi
+ # sticky dir is only group writable:
+ echo "= only group writable dir"
+ chmod o-w $TEST_DIR/$seq/sticky_dir
+ result=`sudo -u $USER2 $XFS_IO_PROG -c "open -f $TEST_DIR/$seq/sticky_dir/$FILENAME" 2>&1`
+ if [ -z "$result" ]; then
+ echo "successfully opened $FILENAME"
+ else
+ echo $result | _filter_test_dir
+ fi
+}
+
+setup_tree()
+{
+ # Create sticky dir owned by $USER2
+ mkdir -p $TEST_DIR/$seq
+ mkdir -p $TEST_DIR/$seq/sticky_dir
+ chmod 1777 $TEST_DIR/$seq/sticky_dir
+ chown $USER2.$USER2 $TEST_DIR/$seq/sticky_dir
+
+ # Create file & fifo in that dir owned by $USER1, and open
+ # normal read/write privs for world & group
+ $XFS_IO_PROG -c "open -f $TEST_DIR/$seq/sticky_dir/file"
+ chown $USER1.$USER1 $TEST_DIR/$seq/sticky_dir/file
+ chmod o+rw $TEST_DIR/$seq/sticky_dir/file
+
+ mkfifo $TEST_DIR/$seq/sticky_dir/fifo
+ chown $USER1.$USER1 $TEST_DIR/$seq/sticky_dir/fifo
+ chmod o+rw $TEST_DIR/$seq/sticky_dir/fifo
+}
+
+setup_tree
+
+# First test fs.protected_regular
+# With protection set to 1, O_CREAT opens in a world-writable sticky
+# directory should fail if the file exists, is owned by another, and
+# file owner != dir owner
+#
+# With protection set to 2, the same goes for group-writable
+# sticky directories
+
+echo "== Test file open when owned by another and file owner != dir owner"
+sysctl -w fs.protected_regular=0
+test_access file
+sysctl -w fs.protected_regular=1
+test_access file
+sysctl -w fs.protected_regular=2
+test_access file
+
+echo
+
+# Now test fs.protected_fifos
+# With protection set to 1, O_CREAT opens in a world-writable sticky
+# directory should fail if the fifo exists, is owned by another, and
+# file owner != dir owner
+#
+# With protection set to 2, the same goes for group-writable
+# sticky directories
+echo "== Test fifo open when owned by another and fifo owner != dir owner"
+sysctl -w fs.protected_fifos=0
+test_access fifo
+sysctl -w fs.protected_fifos=1
+test_access fifo
+sysctl -w fs.protected_fifos=2
+test_access fifo
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/901.out b/tests/generic/901.out
new file mode 100644
index 00000000..af774ca5
--- /dev/null
+++ b/tests/generic/901.out
@@ -0,0 +1,34 @@
+QA output created by 901
+== Test file open when owned by another and file owner != dir owner
+fs.protected_regular = 0
+= group & world writable dir
+successfully opened file
+= only group writable dir
+successfully opened file
+fs.protected_regular = 1
+= group & world writable dir
+TEST_DIR/901/sticky_dir/file: Permission denied
+= only group writable dir
+successfully opened file
+fs.protected_regular = 2
+= group & world writable dir
+TEST_DIR/901/sticky_dir/file: Permission denied
+= only group writable dir
+TEST_DIR/901/sticky_dir/file: Permission denied
+
+== Test fifo open when owned by another and fifo owner != dir owner
+fs.protected_fifos = 0
+= group & world writable dir
+successfully opened fifo
+= only group writable dir
+successfully opened fifo
+fs.protected_fifos = 1
+= group & world writable dir
+TEST_DIR/901/sticky_dir/fifo: Permission denied
+= only group writable dir
+successfully opened fifo
+fs.protected_fifos = 2
+= group & world writable dir
+TEST_DIR/901/sticky_dir/fifo: Permission denied
+= only group writable dir
+TEST_DIR/901/sticky_dir/fifo: Permission denied
diff --git a/tests/generic/group b/tests/generic/group
index 782b0cc3..d1e529d5 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -599,3 +599,4 @@
595 auto quick encrypt
596 auto quick
900 auto quick perms
+901 auto quick perms
