From: Ben Hutchings <ben.hutchings@codethink.co.uk>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] selftests/bpf: Add test case for defence against SSB exploitation
Date: Fri, 23 Nov 2018 18:35:10 +0000 [thread overview]
Message-ID: <20181123183510.irdednmxibfal5mu@xylophone.i.decadent.org.uk> (raw)
In-Reply-To: <20181123183356.5q4bu47zpj5wdufb@xylophone.i.decadent.org.uk>
Test that the defence added by commit af86ca4e3088 "bpf: Prevent
memory disambiguation attack" is actually being applied.
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
---
tools/testing/selftests/bpf/test_verifier.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index e71b7f2e5f17..ca21a63541b0 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -13927,6 +13927,21 @@ static struct bpf_test tests[] = {
.result = ACCEPT,
},
{
+ "reference tracking: defend against SSB exploitation",
+ .insns = {
+ BPF_MOV32_IMM(BPF_REG_2, 1),
+ /* stack[-1] = (integer) 1 */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8),
+ /* stack[-1] = (pointer) context */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .infostr_unpriv = "patching in sanitization against SSB at 2",
+ .result_unpriv = ACCEPT,
+ .result = ACCEPT,
+ },
+ {
"calls: ctx read at start of subprog",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
--
Ben Hutchings, Software Developer Codethink Ltd
https://www.codethink.co.uk/ Dale House, 35 Dale Street
Manchester, M1 2HF, United Kingdom
prev parent reply other threads:[~2018-11-23 18:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-23 18:33 [PATCH 0/3] bpf: Test defence against SSB exploitation Ben Hutchings
2018-11-23 18:34 ` [PATCH 1/3] bpf/verifier: Log instruction patching when verbose logging is enabled Ben Hutchings
2018-11-23 20:10 ` Daniel Borkmann
2018-11-29 15:55 ` Ben Hutchings
2018-11-23 18:35 ` [PATCH 2/3] selftests/bpf: Add the ability to test for a log message on success Ben Hutchings
2018-11-23 18:35 ` Ben Hutchings [this message]
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