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Message-Id: <1458788042-26173-2-git-send-email-mic@digikod.net>
Date: Thu, 24 Mar 2016 03:53:55 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: linux-security-module@...r.kernel.org
Cc: Mickaël Salaün <mic@...ikod.net>,
Andreas Gruenbacher <agruenba@...hat.com>,
Andy Lutomirski <luto@...capital.net>,
Andy Lutomirski <luto@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>,
Daniel Borkmann <daniel@...earbox.net>,
David Drysdale <drysdale@...gle.com>,
Eric Paris <eparis@...hat.com>,
James Morris <james.l.morris@...cle.com>,
Jeff Dike <jdike@...toit.com>,
Julien Tinnes <jln@...gle.com>,
Kees Cook <keescook@...omium.org>,
Michael Kerrisk <mtk@...7.org>,
Paul Moore <pmoore@...hat.com>,
Richard Weinberger <richard@....at>,
"Serge E . Hallyn" <serge@...lyn.com>,
Stephen Smalley <sds@...ho.nsa.gov>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Will Drewry <wad@...omium.org>,
linux-api@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [RFC v1 10/17] selftest/seccomp: Add field_is_valid_syscall test
Test the new seccomp_data field: is_valid_syscall.
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Paul Moore <pmoore@...hat.com>
Cc: Will Drewry <wad@...omium.org>
---
tools/testing/selftests/seccomp/seccomp_bpf.c | 31 +++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index edaa405111aa..8b1a6bfc64a1 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -2208,6 +2208,37 @@ TEST(syscall_restart)
_metadata->passed = 0;
}
+#ifdef SECCOMP_DATA_ARGEVAL_PRESENT
+TEST(field_is_valid_syscall)
+{
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, nr)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, is_valid_syscall)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 1, 1, 0),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ };
+ struct sock_fprog prog = {
+ .len = (unsigned short)ARRAY_SIZE(filter),
+ .filter = filter,
+ };
+
+ ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
+ TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
+ }
+ EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog)) {
+ TH_LOG("Failed to install filter!");
+ }
+
+ EXPECT_EQ(-1, syscall(__NR_getpid));
+ EXPECT_EQ(EINVAL, errno);
+}
+#endif /* SECCOMP_DATA_ARGEVAL_PRESENT */
+
/*
* TODO:
* - add microbenchmarks
--
2.8.0.rc3
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