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Diffstat (limited to 'tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c')
-rw-r--r--tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c b/tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c
new file mode 100644
index 000000000000..b39665f33524
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c
@@ -0,0 +1,245 @@
+{
+ "atomic compare-and-exchange smoketest - 64bit",
+ .insns = {
+ /* val = 3; */
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
+ /* old = atomic_cmpxchg(&val, 2, 4); */
+ BPF_MOV64_IMM(BPF_REG_1, 4),
+ BPF_MOV64_IMM(BPF_REG_0, 2),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
+ /* if (old != 3) exit(2); */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 2),
+ BPF_EXIT_INSN(),
+ /* if (val != 3) exit(3); */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 3),
+ BPF_EXIT_INSN(),
+ /* old = atomic_cmpxchg(&val, 3, 4); */
+ BPF_MOV64_IMM(BPF_REG_1, 4),
+ BPF_MOV64_IMM(BPF_REG_0, 3),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
+ /* if (old != 3) exit(4); */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 4),
+ BPF_EXIT_INSN(),
+ /* if (val != 4) exit(5); */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 5),
+ BPF_EXIT_INSN(),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+},
+{
+ "atomic compare-and-exchange smoketest - 32bit",
+ .insns = {
+ /* val = 3; */
+ BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 3),
+ /* old = atomic_cmpxchg(&val, 2, 4); */
+ BPF_MOV32_IMM(BPF_REG_1, 4),
+ BPF_MOV32_IMM(BPF_REG_0, 2),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -4),
+ /* if (old != 3) exit(2); */
+ BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV32_IMM(BPF_REG_0, 2),
+ BPF_EXIT_INSN(),
+ /* if (val != 3) exit(3); */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
+ BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV32_IMM(BPF_REG_0, 3),
+ BPF_EXIT_INSN(),
+ /* old = atomic_cmpxchg(&val, 3, 4); */
+ BPF_MOV32_IMM(BPF_REG_1, 4),
+ BPF_MOV32_IMM(BPF_REG_0, 3),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -4),
+ /* if (old != 3) exit(4); */
+ BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
+ BPF_MOV32_IMM(BPF_REG_0, 4),
+ BPF_EXIT_INSN(),
+ /* if (val != 4) exit(5); */
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
+ BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
+ BPF_MOV32_IMM(BPF_REG_0, 5),
+ BPF_EXIT_INSN(),
+ /* exit(0); */
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+},
+{
+ "Can't use cmpxchg on uninit src reg",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
+ BPF_MOV64_IMM(BPF_REG_0, 3),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_2, -8),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "!read_ok",
+},
+{
+ "Can't use cmpxchg on uninit memory",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 3),
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_2, -8),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid read from stack",
+},
+{
+ "BPF_W cmpxchg should zero top 32 bits",
+ .insns = {
+ /* r0 = U64_MAX; */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 1),
+ /* u64 val = r0; */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
+ /* r0 = (u32)atomic_cmpxchg((u32 *)&val, r0, 1); */
+ BPF_MOV32_IMM(BPF_REG_1, 1),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
+ /* r1 = 0x00000000FFFFFFFFull; */
+ BPF_MOV64_IMM(BPF_REG_1, 1),
+ BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 32),
+ BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
+ /* if (r0 != r1) exit(1); */
+ BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_1, 2),
+ BPF_MOV32_IMM(BPF_REG_0, 1),
+ BPF_EXIT_INSN(),
+ /* exit(0); */
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+},
+{
+ "Dest pointer in r0 - fail",
+ .insns = {
+ /* val = 0; */
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ /* r0 = &val */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
+ /* r0 = atomic_cmpxchg(&val, r0, 1); */
+ BPF_MOV64_IMM(BPF_REG_1, 1),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
+ /* if (r0 != 0) exit(1); */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_EXIT_INSN(),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R0 leaks addr into mem",
+},
+{
+ "Dest pointer in r0 - succeed",
+ .insns = {
+ /* r0 = &val */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
+ /* val = r0; */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
+ /* r0 = atomic_cmpxchg(&val, r0, 0); */
+ BPF_MOV64_IMM(BPF_REG_1, 0),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
+ /* r1 = *r0 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, -8),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R0 leaks addr into mem",
+},
+{
+ "Dest pointer in r0 - succeed, check 2",
+ .insns = {
+ /* r0 = &val */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
+ /* val = r0; */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
+ /* r5 = &val */
+ BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
+ /* r0 = atomic_cmpxchg(&val, r0, r5); */
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_5, -8),
+ /* r1 = *r0 */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, -8),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R0 leaks addr into mem",
+},
+{
+ "Dest pointer in r0 - succeed, check 3",
+ .insns = {
+ /* r0 = &val */
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
+ /* val = r0; */
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
+ /* r5 = &val */
+ BPF_MOV64_REG(BPF_REG_5, BPF_REG_10),
+ /* r0 = atomic_cmpxchg(&val, r0, r5); */
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_5, -8),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "invalid size of register fill",
+ .errstr_unpriv = "R0 leaks addr into mem",
+},
+{
+ "Dest pointer in r0 - succeed, check 4",
+ .insns = {
+ /* r0 = &val */
+ BPF_MOV32_REG(BPF_REG_0, BPF_REG_10),
+ /* val = r0; */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -8),
+ /* r5 = &val */
+ BPF_MOV32_REG(BPF_REG_5, BPF_REG_10),
+ /* r0 = atomic_cmpxchg(&val, r0, r5); */
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_5, -8),
+ /* r1 = *r10 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_10, -8),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R10 partial copy of pointer",
+},
+{
+ "Dest pointer in r0 - succeed, check 5",
+ .insns = {
+ /* r0 = &val */
+ BPF_MOV32_REG(BPF_REG_0, BPF_REG_10),
+ /* val = r0; */
+ BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -8),
+ /* r5 = &val */
+ BPF_MOV32_REG(BPF_REG_5, BPF_REG_10),
+ /* r0 = atomic_cmpxchg(&val, r0, r5); */
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_5, -8),
+ /* r1 = *r0 */
+ BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, -8),
+ /* exit(0); */
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = REJECT,
+ .errstr = "R0 invalid mem access",
+ .errstr_unpriv = "R10 partial copy of pointer",
+},