Add unit tests for new ldsx insns. The test includes sign-extension
with a single value or with a value range.
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
.../selftests/bpf/prog_tests/verifier.c | 2 +
.../selftests/bpf/progs/verifier_ldsx.c | 117 ++++++++++++++++++
2 files changed, 119 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..4163e9ffffe9
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_ldsx.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+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);
+}
+
+char _license[] SEC("license") = "GPL";
--
2.34.1
