ebpf: Allow dereferences of PTR_TO_STACK registers

[firefly-linux-kernel-4.4.55.git] / samples / bpf / test_verifier.c

diff --git a/samples/bpf/test_verifier.c b/samples/bpf/test_verifier.c
index 693605997abcbb9eb7d069d2ec57b8046579263b..ee0f110c9c543b54fd8593607d161598fb29e472 100644 (file)
--- a/samples/bpf/test_verifier.c
+++ b/samples/bpf/test_verifier.c
@@ -822,6 +822,65 @@ static struct bpf_test tests[] = {
                .result = ACCEPT,
                .prog_type = BPF_PROG_TYPE_SCHED_CLS,
        },
+       {
+               "PTR_TO_STACK store/load",
+               .insns = {
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -10),
+                       BPF_ST_MEM(BPF_DW, BPF_REG_1, 2, 0xfaceb00c),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 2),
+                       BPF_EXIT_INSN(),
+               },
+               .result = ACCEPT,
+       },
+       {
+               "PTR_TO_STACK store/load - bad alignment on off",
+               .insns = {
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+                       BPF_ST_MEM(BPF_DW, BPF_REG_1, 2, 0xfaceb00c),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 2),
+                       BPF_EXIT_INSN(),
+               },
+               .result = REJECT,
+               .errstr = "misaligned access off -6 size 8",
+       },
+       {
+               "PTR_TO_STACK store/load - bad alignment on reg",
+               .insns = {
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -10),
+                       BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
+                       BPF_EXIT_INSN(),
+               },
+               .result = REJECT,
+               .errstr = "misaligned access off -2 size 8",
+       },
+       {
+               "PTR_TO_STACK store/load - out of bounds low",
+               .insns = {
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -80000),
+                       BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
+                       BPF_EXIT_INSN(),
+               },
+               .result = REJECT,
+               .errstr = "invalid stack off=-79992 size=8",
+       },
+       {
+               "PTR_TO_STACK store/load - out of bounds high",
+               .insns = {
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+                       BPF_ST_MEM(BPF_DW, BPF_REG_1, 8, 0xfaceb00c),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
+                       BPF_EXIT_INSN(),
+               },
+               .result = REJECT,
+               .errstr = "invalid stack off=0 size=8",
+       },
 };
 
 static int probe_filter_length(struct bpf_insn *fp)