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test_bpf: add tests checking that JIT/interpreter sets A and X to 0. 

It is mandatory for the JIT or interpreter to reset the A and X
registers to 0 before running the filter. Check that it is the case on
various ALU and JMP instructions.

Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Schichan 2015-08-04 15:19:12 +02:00 committed by David S. Miller
parent 08fcb08fc0
commit 86bf1721b2
1 changed files with 158 additions and 0 deletions
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158
lib/test_bpf.c
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@ -4931,6 +4931,164 @@ static struct bpf_test tests[] = {
}, },
{ {0x40, 0x88ee99ff } }, { {0x40, 0x88ee99ff } },
}, },
/*
* verify that the interpreter or JIT correctly sets A and X
* to 0.
*/
{
"ADD default X",
.u.insns = {
/*
* A = 0x42
* A = A + X
* ret A
*/
BPF_STMT(BPF_LD | BPF_IMM, 0x42),
BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x42 } },
},
{
"ADD default A",
.u.insns = {
/*
* A = A + 0x42
* ret A
*/
BPF_STMT(BPF_ALU | BPF_ADD | BPF_K, 0x42),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x42 } },
},
{
"SUB default X",
.u.insns = {
/*
* A = 0x66
* A = A - X
* ret A
*/
BPF_STMT(BPF_LD | BPF_IMM, 0x66),
BPF_STMT(BPF_ALU | BPF_SUB | BPF_X, 0),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x66 } },
},
{
"SUB default A",
.u.insns = {
/*
* A = A - -0x66
* ret A
*/
BPF_STMT(BPF_ALU | BPF_SUB | BPF_K, -0x66),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x66 } },
},
{
"MUL default X",
.u.insns = {
/*
* A = 0x42
* A = A * X
* ret A
*/
BPF_STMT(BPF_LD | BPF_IMM, 0x42),
BPF_STMT(BPF_ALU | BPF_MUL | BPF_X, 0),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x0 } },
},
{
"MUL default A",
.u.insns = {
/*
* A = A * 0x66
* ret A
*/
BPF_STMT(BPF_ALU | BPF_MUL | BPF_K, 0x66),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x0 } },
},
{
"DIV default X",
.u.insns = {
/*
* A = 0x42
* A = A / X ; this halt the filter execution if X is 0
* ret 0x42
*/
BPF_STMT(BPF_LD | BPF_IMM, 0x42),
BPF_STMT(BPF_ALU | BPF_DIV | BPF_X, 0),
BPF_STMT(BPF_RET | BPF_K, 0x42),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x0 } },
},
{
"DIV default A",
.u.insns = {
/*
* A = A / 1
* ret A
*/
BPF_STMT(BPF_ALU | BPF_DIV | BPF_K, 0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x0 } },
},
{
"JMP EQ default A",
.u.insns = {
/*
* cmp A, 0x0, 0, 1
* ret 0x42
* ret 0x66
*/
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x0, 0, 1),
BPF_STMT(BPF_RET | BPF_K, 0x42),
BPF_STMT(BPF_RET | BPF_K, 0x66),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x42 } },
},
{
"JMP EQ default X",
.u.insns = {
/*
* A = 0x0
* cmp A, X, 0, 1
* ret 0x42
* ret 0x66
*/
BPF_STMT(BPF_LD | BPF_IMM, 0x0),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_X, 0x0, 0, 1),
BPF_STMT(BPF_RET | BPF_K, 0x42),
BPF_STMT(BPF_RET | BPF_K, 0x66),
},
CLASSIC | FLAG_NO_DATA,
{},
{ {0x1, 0x42 } },
},
}; };
static struct net_device dev; static struct net_device dev;