From: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Date: Tue, 14 Sep 2021 11:18:38 +0200
Subject: bpf/tests: Add JMP tests with degenerate conditional
Patch-mainline: v5.16-rc1
Git-commit: c4df4559db8447cdae15254a713f7fd5d4cee3ab
References: jsc#PED-1377
This patch adds a set of tests for JMP and JMP32 operations where the
branch decision is know at JIT time. Mainly testing JIT behaviour.
Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210914091842.4186267-11-johan.almbladh@anyfinetworks.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
lib/test_bpf.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 229 insertions(+)
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -8732,6 +8732,235 @@ static struct bpf_test tests[] = {
.fill_helper = bpf_fill_jmp32_jsle_reg,
.nr_testruns = NR_PATTERN_RUNS,
},
+ /* Conditional jumps with constant decision */
+ {
+ "JMP_JSET_K: imm = 0 -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_IMM(BPF_JSET, R1, 0, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JLT_K: imm = 0 -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_IMM(BPF_JLT, R1, 0, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JGE_K: imm = 0 -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_IMM(BPF_JGE, R1, 0, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JGT_K: imm = 0xffffffff -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_IMM(BPF_JGT, R1, U32_MAX, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JLE_K: imm = 0xffffffff -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_IMM(BPF_JLE, R1, U32_MAX, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP32_JSGT_K: imm = 0x7fffffff -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP32_IMM(BPF_JSGT, R1, S32_MAX, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP32_JSGE_K: imm = -0x80000000 -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP32_IMM(BPF_JSGE, R1, S32_MIN, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP32_JSLT_K: imm = -0x80000000 -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP32_IMM(BPF_JSLT, R1, S32_MIN, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP32_JSLE_K: imm = 0x7fffffff -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP32_IMM(BPF_JSLE, R1, S32_MAX, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JEQ_X: dst = src -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JEQ, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JGE_X: dst = src -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JGE, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JLE_X: dst = src -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JLE, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JSGE_X: dst = src -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JSGE, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JSLE_X: dst = src -> always taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JSLE, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 1 } },
+ },
+ {
+ "JMP_JNE_X: dst = src -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JNE, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JGT_X: dst = src -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JGT, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JLT_X: dst = src -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JLT, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JSGT_X: dst = src -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JSGT, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
+ {
+ "JMP_JSLT_X: dst = src -> never taken",
+ .u.insns_int = {
+ BPF_ALU64_IMM(BPF_MOV, R0, 1),
+ BPF_JMP_REG(BPF_JSLT, R1, R1, 1),
+ BPF_ALU64_IMM(BPF_MOV, R0, 0),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL | FLAG_NO_DATA,
+ { },
+ { { 0, 0 } },
+ },
/* Short relative jumps */
{
"Short relative jump: offset=0",