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bpf/verifier: Handle BPF_LOAD_ACQ instructions in insn_def_regno()

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In preparation for supporting BPF load-acquire and store-release
instructions for architectures where bpf_jit_needs_zext() returns true
(e.g. riscv64), make insn_def_regno() handle load-acquires properly.

Acked-by: Björn Töpel <bjorn@kernel.org>
Tested-by: Björn Töpel <bjorn@rivosinc.com> # QEMU/RVA23
Signed-off-by: Peilin Ye <yepeilin@google.com>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Link: https://lore.kernel.org/r/09cb2aec979aaed9d16db41f0f5b364de39377c0.1746588351.git.yepeilin@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Peilin Ye 2025-05-07 03:42:45 +00:00 • committed by Alexei Starovoitov
parent b69d4413aa
commit fce7bd8e38
1 changed files with 6 additions and 6 deletions
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12
kernel/bpf/verifier.c
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@ -3649,16 +3649,16 @@ static int insn_def_regno(const struct bpf_insn *insn)
case BPF_ST:
return -1;
case BPF_STX:
if ((BPF_MODE(insn->code) == BPF_ATOMIC ||
BPF_MODE(insn->code) == BPF_PROBE_ATOMIC) &&
(insn->imm & BPF_FETCH)) {
if (BPF_MODE(insn->code) == BPF_ATOMIC ||
BPF_MODE(insn->code) == BPF_PROBE_ATOMIC) {
if (insn->imm == BPF_CMPXCHG)
return BPF_REG_0;
else
else if (insn->imm == BPF_LOAD_ACQ)
return insn->dst_reg;
else if (insn->imm & BPF_FETCH)
return insn->src_reg;
} else {
return -1;
}
return -1;
default:
return insn->dst_reg;
}