From: Yonghong Song <yonghong.song@linux.dev>
To: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>
Cc: David Faust <david.faust@oracle.com>,
Fangrui Song <maskray@google.com>,
"Jose E . Marchesi" <jose.marchesi@oracle.com>,
kernel-team@fb.com
Subject: [PATCH bpf-next v4 11/17] selftests/bpf: Add unit tests for new sign-extension load insns
Date: Wed, 26 Jul 2023 15:08:27 -0700 [thread overview]
Message-ID: <20230726220827.1100979-1-yonghong.song@linux.dev> (raw)
In-Reply-To: <20230726220726.1089817-1-yonghong.song@linux.dev>
Add unit tests for new ldsx insns. The test includes sign-extension
with a single value or with a value range.
If cpuv4 is not supported due to
(1) older compiler, e.g., less than clang version 18, or
(2) test runner test_progs and test_progs-no_alu32 which tests
cpu v2 and v3, or
(3) non-x86_64 arch not supporting new insns in jit yet,
a dummy program is added with below output:
#318/1 verifier_ldsx/cpuv4 is not supported by compiler or jit, use a dummy test:OK
#318 verifier_ldsx:OK
to indicate the test passed with a dummy test instead of actually
testing cpuv4. I am using a dummy prog to avoid changing the
verifier testing infrastructure. Once clang 18 is widely available
and other architectures support cpuv4, at least for CI run,
the dummy program can be removed.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
---
.../selftests/bpf/prog_tests/verifier.c | 2 +
.../selftests/bpf/progs/verifier_ldsx.c | 131 ++++++++++++++++++
2 files changed, 133 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/verifier_ldsx.c
diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index c375e59ff28d..6eec6a9463c8 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -31,6 +31,7 @@
#include "verifier_int_ptr.skel.h"
#include "verifier_jeq_infer_not_null.skel.h"
#include "verifier_ld_ind.skel.h"
+#include "verifier_ldsx.skel.h"
#include "verifier_leak_ptr.skel.h"
#include "verifier_loops1.skel.h"
#include "verifier_lwt.skel.h"
@@ -133,6 +134,7 @@ void test_verifier_helper_value_access(void) { RUN(verifier_helper_value_access
void test_verifier_int_ptr(void) { RUN(verifier_int_ptr); }
void test_verifier_jeq_infer_not_null(void) { RUN(verifier_jeq_infer_not_null); }
void test_verifier_ld_ind(void) { RUN(verifier_ld_ind); }
+void test_verifier_ldsx(void) { RUN(verifier_ldsx); }
void test_verifier_leak_ptr(void) { RUN(verifier_leak_ptr); }
void test_verifier_loops1(void) { RUN(verifier_loops1); }
void test_verifier_lwt(void) { RUN(verifier_lwt); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_ldsx.c b/tools/testing/selftests/bpf/progs/verifier_ldsx.c
new file mode 100644
index 000000000000..3c3d1bddd67f
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_ldsx.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+#if defined(__TARGET_ARCH_x86) && __clang_major__ >= 18
+
+SEC("socket")
+__description("LDSX, S8")
+__success __success_unpriv __retval(-2)
+__naked void ldsx_s8(void)
+{
+ asm volatile (" \
+ r1 = 0x3fe; \
+ *(u64 *)(r10 - 8) = r1; \
+ r0 = *(s8 *)(r10 - 8); \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("socket")
+__description("LDSX, S16")
+__success __success_unpriv __retval(-2)
+__naked void ldsx_s16(void)
+{
+ asm volatile (" \
+ r1 = 0x3fffe; \
+ *(u64 *)(r10 - 8) = r1; \
+ r0 = *(s16 *)(r10 - 8); \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("socket")
+__description("LDSX, S32")
+__success __success_unpriv __retval(-1)
+__naked void ldsx_s32(void)
+{
+ asm volatile (" \
+ r1 = 0xfffffffe; \
+ *(u64 *)(r10 - 8) = r1; \
+ r0 = *(s32 *)(r10 - 8); \
+ r0 >>= 1; \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("socket")
+__description("LDSX, S8 range checking, privileged")
+__log_level(2) __success __retval(1)
+__msg("R1_w=scalar(smin=-128,smax=127)")
+__naked void ldsx_s8_range_priv(void)
+{
+ asm volatile (" \
+ call %[bpf_get_prandom_u32]; \
+ *(u64 *)(r10 - 8) = r0; \
+ r1 = *(s8 *)(r10 - 8); \
+ /* r1 with s8 range */ \
+ if r1 s> 0x7f goto l0_%=; \
+ if r1 s< -0x80 goto l0_%=; \
+ r0 = 1; \
+l1_%=: \
+ exit; \
+l0_%=: \
+ r0 = 2; \
+ goto l1_%=; \
+" :
+ : __imm(bpf_get_prandom_u32)
+ : __clobber_all);
+}
+
+SEC("socket")
+__description("LDSX, S16 range checking")
+__success __success_unpriv __retval(1)
+__naked void ldsx_s16_range(void)
+{
+ asm volatile (" \
+ call %[bpf_get_prandom_u32]; \
+ *(u64 *)(r10 - 8) = r0; \
+ r1 = *(s16 *)(r10 - 8); \
+ /* r1 with s16 range */ \
+ if r1 s> 0x7fff goto l0_%=; \
+ if r1 s< -0x8000 goto l0_%=; \
+ r0 = 1; \
+l1_%=: \
+ exit; \
+l0_%=: \
+ r0 = 2; \
+ goto l1_%=; \
+" :
+ : __imm(bpf_get_prandom_u32)
+ : __clobber_all);
+}
+
+SEC("socket")
+__description("LDSX, S32 range checking")
+__success __success_unpriv __retval(1)
+__naked void ldsx_s32_range(void)
+{
+ asm volatile (" \
+ call %[bpf_get_prandom_u32]; \
+ *(u64 *)(r10 - 8) = r0; \
+ r1 = *(s32 *)(r10 - 8); \
+ /* r1 with s16 range */ \
+ if r1 s> 0x7fffFFFF goto l0_%=; \
+ if r1 s< -0x80000000 goto l0_%=; \
+ r0 = 1; \
+l1_%=: \
+ exit; \
+l0_%=: \
+ r0 = 2; \
+ goto l1_%=; \
+" :
+ : __imm(bpf_get_prandom_u32)
+ : __clobber_all);
+}
+
+#else
+
+SEC("socket")
+__description("cpuv4 is not supported by compiler or jit, use a dummy test")
+__success
+int dummy_test(void)
+{
+ return 0;
+}
+
+#endif
+
+char _license[] SEC("license") = "GPL";
--
2.34.1
next prev parent reply other threads:[~2023-07-26 22:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-26 22:07 [PATCH bpf-next v4 00/17] bpf: Support new insns from cpu v4 Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 01/17] bpf: Support new sign-extension load insns Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 02/17] bpf: Support new sign-extension mov insns Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 03/17] bpf: Handle sign-extenstin ctx member accesses Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 04/17] bpf: Support new unconditional bswap instruction Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 05/17] bpf: Support new signed div/mod instructions Yonghong Song
2023-07-26 22:07 ` [PATCH bpf-next v4 06/17] bpf: Fix jit blinding with new sdiv/smov insns Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 07/17] bpf: Support new 32bit offset jmp instruction Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 09/17] selftests/bpf: Fix a test_verifier failure Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 10/17] selftests/bpf: Add a cpuv4 test runner for cpu=v4 testing Yonghong Song
2023-07-26 22:08 ` Yonghong Song [this message]
2023-07-26 22:08 ` [PATCH bpf-next v4 12/17] selftests/bpf: Add unit tests for new sign-extension mov insns Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 13/17] selftests/bpf: Add unit tests for new bswap insns Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 14/17] selftests/bpf: Add unit tests for new sdiv/smod insns Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 15/17] selftests/bpf: Add unit tests for new gotol insn Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 16/17] selftests/bpf: Test ldsx with more complex cases Yonghong Song
2023-07-26 22:08 ` [PATCH bpf-next v4 17/17] docs/bpf: Add documentation for new instructions Yonghong Song
2023-07-26 22:19 ` Dave Thaler
2023-07-26 22:19 ` [Bpf] " Dave Thaler
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230726220827.1100979-1-yonghong.song@linux.dev \
--to=yonghong.song@linux.dev \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=david.faust@oracle.com \
--cc=jose.marchesi@oracle.com \
--cc=kernel-team@fb.com \
--cc=martin.lau@kernel.org \
--cc=maskray@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox