netdev - [RFC PATCH bpf-next v1 03/14] MIPS: eBPF: fix BPF_ALU|ARSH handling in JIT static analysis

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Message-Id: <ad3c9df52fadf63586d4efd8f6b3ee601f034654.1625970384.git.Tony.Ambardar@gmail.com>
Date:   Sun, 11 Jul 2021 17:34:49 -0700
From:   Tony Ambardar <tony.ambardar@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>
Cc:     Tony Ambardar <Tony.Ambardar@...il.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-mips@...r.kernel.org,
        Johan Almbladh <johan.almbladh@...finetworks.com>,
        Hassan Naveed <hnaveed@...ecomp.com>,
        David Daney <ddaney@...iumnetworks.com>,
        Luke Nelson <luke.r.nels@...il.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Subject: [RFC PATCH bpf-next v1 03/14] MIPS: eBPF: fix BPF_ALU|ARSH handling in JIT static analysis

Update reg_val_propagate_range() to add the missing case for BPF_ALU|ARSH,
otherwise zero-extension breaks for this opcode.

Resolves failures for test_verifier tests:
  963/p arsh32 reg zero extend check FAIL retval -1 != 0
  964/u arsh32 imm zero extend check FAIL retval -1 != 0
  964/p arsh32 imm zero extend check FAIL retval -1 != 0

Fixes: b6bd53f9c4e8 ("MIPS: Add missing file for eBPF JIT.")
Signed-off-by: Tony Ambardar <Tony.Ambardar@...il.com>
---
 arch/mips/net/ebpf_jit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/net/ebpf_jit.c b/arch/mips/net/ebpf_jit.c
index 64f76c7191b1..67b45d502435 100644
--- a/arch/mips/net/ebpf_jit.c
+++ b/arch/mips/net/ebpf_jit.c
@@ -1587,6 +1587,7 @@ static int reg_val_propagate_range(struct jit_ctx *ctx, u64 initial_rvt,
 			case BPF_AND:
 			case BPF_LSH:
 			case BPF_RSH:
+			case BPF_ARSH:
 			case BPF_NEG:
 			case BPF_MOD:
 			case BPF_XOR:
-- 
2.25.1