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Commit d3796e8f authored by John Fastabend's avatar John Fastabend Committed by Greg Kroah-Hartman
Browse files

bpf, selftests: Add a verifier test for assigning 32bit reg states to 64bit ones 



commit cf66c29bd7534813d2e1971fab71e25fe87c7e0a upstream

Added a verifier test for assigning 32bit reg states to
64bit where 32bit reg holds a constant value of 0.

Without previous kernel verifier.c fix, the test in
this patch will fail.

Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/159077335867.6014.2075350327073125374.stgit@john-Precision-5820-Tower


Signed-off-by: default avatarOvidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8dec99ab

tools/testing/selftests/bpf/verifier/bounds.c

+22 −0
Original line number Diff line number Diff line
@@ -545,3 +545,25 @@ 
	},

	.result = ACCEPT

},

{

	"assigning 32bit bounds to 64bit for wA = 0, wB = wA",

	.insns = {

	BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1,

		    offsetof(struct __sk_buff, data_end)),

	BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

		    offsetof(struct __sk_buff, data)),

	BPF_MOV32_IMM(BPF_REG_9, 0),

	BPF_MOV32_REG(BPF_REG_2, BPF_REG_9),

	BPF_MOV64_REG(BPF_REG_6, BPF_REG_7),

	BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_2),

	BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

	BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8),

	BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_8, 1),

	BPF_LDX_MEM(BPF_W, BPF_REG_5, BPF_REG_6, 0),

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_EXIT_INSN(),

	},

	.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	.result = ACCEPT,

	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

},