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selftests, bpf: Test that dead ldx_w insns are accepted

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Prevent regressions related to zero-extension metadata handling during
dead code sanitization.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210812151811.184086-3-iii@linux.ibm.com
This commit is contained in:
Ilya Leoshkevich 2021-08-12 17:18:11 +02:00 committed by Daniel Borkmann
parent 45c709f8c7
commit 3776f3517e
1 changed files with 12 additions and 0 deletions
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12
tools/testing/selftests/bpf/verifier/dead_code.c
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@ -159,3 +159,15 @@
.result = ACCEPT,
.retval = 2,
},
{
"dead code: zero extension",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4),
BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 1),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.retval = 0,
},