RFE: add support for comparisons against 32-bit arguments

src/python/libseccomp.pxd

@@ -72,6 +72,7 @@ cdef extern from "seccomp.h":
         SCMP_CMP_GE
         SCMP_CMP_GT
         SCMP_CMP_MASKED_EQ
+        SCMP_CMP_32BIT
 
     cdef enum:
         SCMP_ACT_KILL_PROCESS

src/python/seccomp.pyx

@@ -133,6 +133,7 @@ EQ = libseccomp.SCMP_CMP_EQ
 GE = libseccomp.SCMP_CMP_GE
 GT = libseccomp.SCMP_CMP_GT
 MASKED_EQ = libseccomp.SCMP_CMP_MASKED_EQ
+CMP_32BIT = libseccomp.SCMP_CMP_32BIT
 
 def system_arch():
     """ Return the system architecture value.

tests/60-sim-32b_args_on_64b.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+#
+# Seccomp Library test program
+#
+# Copyright (c) 2022 Canonical Ltd.
+# Author: James Henstridge <[email protected]>
+#
+
+#
+# This library is free software; you can redistribute it and/or modify it
+# under the terms of version 2.1 of the GNU Lesser General Public License as
+# published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+# for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library; if not, see <http://www.gnu.org/licenses>.
+#
+
+import argparse
+import sys
+
+import util
+
+from seccomp import *
+
+def test(args):
+    f = SyscallFilter(KILL)
+    f.add_rule_exactly(ALLOW, 1001, Arg(0, NE | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1002, Arg(0, LT | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1003, Arg(0, LE | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1004, Arg(0, EQ | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1005, Arg(0, GE | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1006, Arg(0, GT | CMP_32BIT, 0x10))
+    f.add_rule_exactly(ALLOW, 1007, Arg(0, MASKED_EQ | CMP_32BIT, 0xff, 0x10))
+    return f
+
+args = util.get_opt()
+ctx = test(args)
+util.filter_output(args, ctx)
+
+# kate: syntax python;
+# kate: indent-mode python; space-indent on; indent-width 4; mixedindent off;

tests/Makefile.am

@@ -155,7 +155,8 @@ EXTRA_DIST_TESTPYTHON = \
 	56-basic-iterate_syscalls.py \
 	57-basic-rawsysrc.py \
 	58-live-tsync_notify.py \
-	59-basic-empty_binary_tree.py
+	59-basic-empty_binary_tree.py \
+	60-sim-32b_args_on_64b.tests.py
 
 EXTRA_DIST_TESTCFGS = \
 	01-sim-allow.tests \