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Commit 87c1793b authored by Daniel Borkmann's avatar Daniel Borkmann Committed by Alexei Starovoitov
Browse files

bpf: add couple of test cases for div/mod by zero 



Add couple of missing test cases for eBPF div/mod by zero to the
new test_verifier prog runtime feature. Also one for an empty prog
and only exit.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent fcd1c917

tools/testing/selftests/bpf/test_verifier.c

+87 −0
Original line number Diff line number Diff line
@@ -101,6 +101,93 @@ static struct bpf_test tests[] = { 
		.result = ACCEPT,

		.retval = -3,

	},

	{

		"DIV32 by 0, zero check 1",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_MOV32_IMM(BPF_REG_1, 0),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU32_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"DIV32 by 0, zero check 2",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_LD_IMM64(BPF_REG_1, 0xffffffff00000000LL),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU32_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"DIV64 by 0, zero check",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_MOV32_IMM(BPF_REG_1, 0),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU64_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"MOD32 by 0, zero check 1",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_MOV32_IMM(BPF_REG_1, 0),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU32_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"MOD32 by 0, zero check 2",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_LD_IMM64(BPF_REG_1, 0xffffffff00000000LL),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU32_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"MOD64 by 0, zero check",

		.insns = {

			BPF_MOV32_IMM(BPF_REG_0, 42),

			BPF_MOV32_IMM(BPF_REG_1, 0),

			BPF_MOV32_IMM(BPF_REG_2, 1),

			BPF_ALU64_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.retval = 0,

	},

	{

		"empty prog",

		.insns = {

		},

		.errstr = "last insn is not an exit or jmp",

		.result = REJECT,

	},

	{

		"only exit insn",

		.insns = {

			BPF_EXIT_INSN(),

		},

		.errstr = "R0 !read_ok",

		.result = REJECT,

	},

	{

		"unreachable",

		.insns = {