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Commit be08815c authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Alexei Starovoitov
Browse files

bpf: add also cbpf long jump test cases with heavy expansion 



We have one triggering on eBPF but lets also add a cBPF example to
make sure we keep tracking them. Also add anther cBPF test running
max number of MSH ops.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 06be0864

lib/test_bpf.c

+63 −0
Original line number Diff line number Diff line
@@ -356,6 +356,52 @@ static int bpf_fill_maxinsns11(struct bpf_test *self) 
	return __bpf_fill_ja(self, BPF_MAXINSNS, 68);

}



static int bpf_fill_maxinsns12(struct bpf_test *self)

{

	unsigned int len = BPF_MAXINSNS;

	struct sock_filter *insn;

	int i = 0;



	insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL);

	if (!insn)

		return -ENOMEM;



	insn[0] = __BPF_JUMP(BPF_JMP | BPF_JA, len - 2, 0, 0);



	for (i = 1; i < len - 1; i++)

		insn[i] = __BPF_STMT(BPF_LDX | BPF_B | BPF_MSH, 0);



	insn[len - 1] = __BPF_STMT(BPF_RET | BPF_K, 0xabababab);



	self->u.ptr.insns = insn;

	self->u.ptr.len = len;



	return 0;

}



static int bpf_fill_maxinsns13(struct bpf_test *self)

{

	unsigned int len = BPF_MAXINSNS;

	struct sock_filter *insn;

	int i = 0;



	insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL);

	if (!insn)

		return -ENOMEM;



	for (i = 0; i < len - 3; i++)

		insn[i] = __BPF_STMT(BPF_LDX | BPF_B | BPF_MSH, 0);



	insn[len - 3] = __BPF_STMT(BPF_LD | BPF_IMM, 0xabababab);

	insn[len - 2] = __BPF_STMT(BPF_ALU | BPF_XOR | BPF_X, 0);

	insn[len - 1] = __BPF_STMT(BPF_RET | BPF_A, 0);



	self->u.ptr.insns = insn;

	self->u.ptr.len = len;



	return 0;

}



static int bpf_fill_ja(struct bpf_test *self)

{

	/* Hits exactly 11 passes on x86_64 JIT. */
@@ -5289,6 +5335,23 @@ static struct bpf_test tests[] = { 
		.fill_helper = bpf_fill_maxinsns11,

		.expected_errcode = -ENOTSUPP,

	},

	{

		"BPF_MAXINSNS: jump over MSH",

		{ },

		CLASSIC | FLAG_EXPECTED_FAIL,

		{ 0xfa, 0xfb, 0xfc, 0xfd, },

		{ { 4, 0xabababab } },

		.fill_helper = bpf_fill_maxinsns12,

		.expected_errcode = -EINVAL,

	},

	{

		"BPF_MAXINSNS: exec all MSH",

		{ },

		CLASSIC,

		{ 0xfa, 0xfb, 0xfc, 0xfd, },

		{ { 4, 0xababab83 } },

		.fill_helper = bpf_fill_maxinsns13,

	},

	{

		"BPF_MAXINSNS: ld_abs+get_processor_id",

		{ },