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selftests/bpf: add verifier tests for bpf_call 

Add extensive set of tests for bpf_call verification logic:

calls: basic sanity
calls: using r0 returned by callee
calls: callee is using r1
calls: callee using args1
calls: callee using wrong args2
calls: callee using two args
calls: callee changing pkt pointers
calls: two calls with args
calls: two calls with bad jump
calls: recursive call. test1
calls: recursive call. test2
calls: unreachable code
calls: invalid call
calls: jumping across function bodies. test1
calls: jumping across function bodies. test2
calls: call without exit
calls: call into middle of ld_imm64
calls: call into middle of other call
calls: two calls with bad fallthrough
calls: two calls with stack read
calls: two calls with stack write
calls: spill into caller stack frame
calls: two calls with stack write and void return
calls: ambiguous return value
calls: two calls that return map_value
calls: two calls that return map_value with bool condition
calls: two calls that return map_value with incorrect bool check
calls: two calls that receive map_value via arg=ptr_stack_of_caller. test1
calls: two calls that receive map_value via arg=ptr_stack_of_caller. test2
calls: two jumps that receive map_value via arg=ptr_stack_of_jumper. test3
calls: two calls that receive map_value_ptr_or_null via arg. test1
calls: two calls that receive map_value_ptr_or_null via arg. test2
calls: pkt_ptr spill into caller stack

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2017-12-14 17:55:07 -08:00 committed by Daniel Borkmann
parent f4d7e40a5b
commit a7ff3eca95
1 changed files with 960 additions and 1 deletions
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961
tools/testing/selftests/bpf/test_verifier.c
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@ -2,6 +2,7 @@
* Testsuite for eBPF verifier
*
* Copyright (c) 2014 PLUMgrid, http://plumgrid.com
* Copyright (c) 2017 Facebook
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@ -277,7 +278,7 @@ static struct bpf_test tests[] = {
.insns = {
BPF_ALU64_REG(BPF_MOV, BPF_REG_0, BPF_REG_2),
},
.errstr = "jump out of range",
.errstr = "not an exit",
.result = REJECT,
},
{
@ -8097,6 +8098,964 @@ static struct bpf_test tests[] = {
.result = REJECT,
.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
},
{
"calls: basic sanity",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 2),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.result = ACCEPT,
},
{
"calls: using r0 returned by callee",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 2),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.result = ACCEPT,
},
{
"calls: callee is using r1",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
offsetof(struct __sk_buff, len)),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_ACT,
.result = ACCEPT,
},
{
"calls: callee using args1",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "allowed for root only",
.result_unpriv = REJECT,
.result = ACCEPT,
},
{
"calls: callee using wrong args2",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "R2 !read_ok",
.result = REJECT,
},
{
"calls: callee using two args",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
offsetof(struct __sk_buff, len)),
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_6,
offsetof(struct __sk_buff, len)),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "allowed for root only",
.result_unpriv = REJECT,
.result = ACCEPT,
},
{
"calls: callee changing pkt pointers",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
offsetof(struct xdp_md, data)),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
offsetof(struct xdp_md, data_end)),
BPF_MOV64_REG(BPF_REG_8, BPF_REG_6),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_8, 8),
BPF_JMP_REG(BPF_JGT, BPF_REG_8, BPF_REG_7, 2),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
/* clear_all_pkt_pointers() has to walk all frames
* to make sure that pkt pointers in the caller
* are cleared when callee is calling a helper that
* adjusts packet size
*/
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_xdp_adjust_head),
BPF_EXIT_INSN(),
},
.result = REJECT,
.errstr = "R6 invalid mem access 'inv'",
.prog_type = BPF_PROG_TYPE_XDP,
},
{
"calls: two calls with args",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
offsetof(struct __sk_buff, len)),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"calls: two calls with bad jump",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
offsetof(struct __sk_buff, len)),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, -3),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "jump out of range from insn 11 to 9",
.result = REJECT,
},
{
"calls: recursive call. test1",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "back-edge",
.result = REJECT,
},
{
"calls: recursive call. test2",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -3),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "back-edge",
.result = REJECT,
},
{
"calls: unreachable code",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "unreachable insn 6",
.result = REJECT,
},
{
"calls: invalid call",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -4),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "invalid destination",
.result = REJECT,
},
{
"calls: jumping across function bodies. test1",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -3),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "jump out of range",
.result = REJECT,
},
{
"calls: jumping across function bodies. test2",
.insns = {
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 3),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "jump out of range",
.result = REJECT,
},
{
"calls: call without exit",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -2),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "not an exit",
.result = REJECT,
},
{
"calls: call into middle of ld_imm64",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LD_IMM64(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "last insn",
.result = REJECT,
},
{
"calls: call into middle of other call",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "last insn",
.result = REJECT,
},
{
"calls: two calls with bad fallthrough",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_0),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
offsetof(struct __sk_buff, len)),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
.errstr = "not an exit",
.result = REJECT,
},
{
"calls: two calls with stack read",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_XDP,
.result = ACCEPT,
},
{
"calls: two calls with stack write",
.insns = {
/* main prog */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 7),
BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
BPF_ALU64_REG(BPF_ADD, BPF_REG_8, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
/* write into stack frame of main prog */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 2 */
/* read from stack frame of main prog */
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_XDP,
.result = ACCEPT,
},
{
"calls: spill into caller stack frame",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_XDP,
.errstr = "cannot spill",
.result = REJECT,
},
{
"calls: two calls with stack write and void return",
.insns = {
/* main prog */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
/* subprog 2 */
/* write into stack frame of main prog */
BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 0),
BPF_EXIT_INSN(), /* void return */
},
.prog_type = BPF_PROG_TYPE_XDP,
.result = ACCEPT,
},
{
"calls: ambiguous return value",
.insns = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_EXIT_INSN(),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "allowed for root only",
.result_unpriv = REJECT,
.errstr = "R0 !read_ok",
.result = REJECT,
},
{
"calls: two calls that return map_value",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 8),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* fetch secound map_value_ptr from the stack */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
/* call 3rd function twice */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* first time with fp-8 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* second time with fp-16 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
/* subprog 2 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
/* lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
/* write map_value_ptr into stack frame of main prog */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(), /* return 0 */
},
.prog_type = BPF_PROG_TYPE_XDP,
.fixup_map1 = { 23 },
.result = ACCEPT,
},
{
"calls: two calls that return map_value with bool condition",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
/* call 3rd function twice */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* first time with fp-8 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 9),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* second time with fp-16 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
/* fetch secound map_value_ptr from the stack */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_EXIT_INSN(),
/* subprog 2 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
/* lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(), /* return 0 */
/* write map_value_ptr into stack frame of main prog */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(), /* return 1 */
},
.prog_type = BPF_PROG_TYPE_XDP,
.fixup_map1 = { 23 },
.result = ACCEPT,
},
{
"calls: two calls that return map_value with incorrect bool check",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
/* call 3rd function twice */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* first time with fp-8 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 9),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* second time with fp-16 */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
/* fetch secound map_value_ptr from the stack */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_EXIT_INSN(),
/* subprog 2 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
/* lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(), /* return 0 */
/* write map_value_ptr into stack frame of main prog */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(), /* return 1 */
},
.prog_type = BPF_PROG_TYPE_XDP,
.fixup_map1 = { 23 },
.result = REJECT,
.errstr = "invalid read from stack off -16+0 size 8",
},
{
"calls: two calls that receive map_value via arg=ptr_stack_of_caller. test1",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* 1st lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-8 */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_8, 1),
/* 2nd lookup from map */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), /* 20 */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, /* 24 */
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_9, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-16 */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_9, 1),
/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), /* 30 */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1), /* 34 */
BPF_EXIT_INSN(),
/* subprog 2 */
/* if arg2 == 1 do *arg1 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* if arg4 == 1 do *arg3 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 2, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map1 = { 12, 22 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=8 off=2 size=8",
},
{
"calls: two calls that receive map_value via arg=ptr_stack_of_caller. test2",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* 1st lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-8 */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_8, 1),
/* 2nd lookup from map */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), /* 20 */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, /* 24 */
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_9, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-16 */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_9, 1),
/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), /* 30 */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1), /* 34 */
BPF_EXIT_INSN(),
/* subprog 2 */
/* if arg2 == 1 do *arg1 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* if arg4 == 1 do *arg3 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map1 = { 12, 22 },
.result = ACCEPT,
},
{
"calls: two jumps that receive map_value via arg=ptr_stack_of_jumper. test3",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* 1st lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -24, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -24),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-8 */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_8, 1),
/* 2nd lookup from map */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -24),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_9, 0), // 26
BPF_JMP_IMM(BPF_JA, 0, 0, 2),
/* write map_value_ptr into stack frame of main prog at fp-16 */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_9, 1),
/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), // 30
BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1), // 34
BPF_JMP_IMM(BPF_JA, 0, 0, -30),
/* subprog 2 */
/* if arg2 == 1 do *arg1 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* if arg4 == 1 do *arg3 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 2, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, -8),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map1 = { 12, 22 },
.result = REJECT,
.errstr = "invalid access to map value, value_size=8 off=2 size=8",
},
{
"calls: two calls that receive map_value_ptr_or_null via arg. test1",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* 1st lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
/* write map_value_ptr_or_null into stack frame of main prog at fp-8 */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_MOV64_IMM(BPF_REG_8, 1),
/* 2nd lookup from map */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
/* write map_value_ptr_or_null into stack frame of main prog at fp-16 */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_9, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_MOV64_IMM(BPF_REG_9, 1),
/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
/* subprog 2 */
/* if arg2 == 1 do *arg1 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* if arg4 == 1 do *arg3 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map1 = { 12, 22 },
.result = ACCEPT,
},
{
"calls: two calls that receive map_value_ptr_or_null via arg. test2",
.insns = {
/* main prog */
/* pass fp-16, fp-8 into a function */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
/* 1st lookup from map */
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
/* write map_value_ptr_or_null into stack frame of main prog at fp-8 */
BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_8, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_MOV64_IMM(BPF_REG_8, 1),
/* 2nd lookup from map */
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
/* write map_value_ptr_or_null into stack frame of main prog at fp-16 */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_9, 0),
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
BPF_MOV64_IMM(BPF_REG_9, 1),
/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
/* subprog 2 */
/* if arg2 == 1 do *arg1 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
/* if arg4 == 0 do *arg3 = 0 */
BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 0, 2),
/* fetch map_value_ptr from the stack of this function */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
/* write into map value */
BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map1 = { 12, 22 },
.result = REJECT,
.errstr = "R0 invalid mem access 'inv'",
},
{
"calls: pkt_ptr spill into caller stack",
.insns = {
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
BPF_EXIT_INSN(),
/* subprog 1 */
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
/* spill unchecked pkt_ptr into stack of caller */
BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_2, 0),
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 2),
/* now the pkt range is verified, read pkt_ptr from stack */
BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_4, 0),
/* write 4 bytes into packet */
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
};
static int probe_filter_length(const struct bpf_insn *fp)