linux-kernel - [PATCH 5.11 118/122] bpf: Move off_reg into sanitize_ptr

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Message-Id: <20210419130534.177288531@linuxfoundation.org>
Date:   Mon, 19 Apr 2021 15:06:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 118/122] bpf: Move off_reg into sanitize_ptr_alu

From: Daniel Borkmann <daniel@...earbox.net>

[ Upstream commit 6f55b2f2a1178856c19bbce2f71449926e731914 ]

Small refactor to drag off_reg into sanitize_ptr_alu(), so we later on can
use off_reg for generalizing some of the checks for all pointer types.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Reviewed-by: John Fastabend <john.fastabend@...il.com>
Acked-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/bpf/verifier.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index fe473e565092..afb2ae55c9a7 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5463,11 +5463,12 @@ static int sanitize_val_alu(struct bpf_verifier_env *env,
 static int sanitize_ptr_alu(struct bpf_verifier_env *env,
 			    struct bpf_insn *insn,
 			    const struct bpf_reg_state *ptr_reg,
-			    struct bpf_reg_state *dst_reg,
-			    bool off_is_neg)
+			    const struct bpf_reg_state *off_reg,
+			    struct bpf_reg_state *dst_reg)
 {
 	struct bpf_verifier_state *vstate = env->cur_state;
 	struct bpf_insn_aux_data *aux = cur_aux(env);
+	bool off_is_neg = off_reg->smin_value < 0;
 	bool ptr_is_dst_reg = ptr_reg == dst_reg;
 	u8 opcode = BPF_OP(insn->code);
 	u32 alu_state, alu_limit;
@@ -5602,7 +5603,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
 
 	switch (opcode) {
 	case BPF_ADD:
-		ret = sanitize_ptr_alu(env, insn, ptr_reg, dst_reg, smin_val < 0);
+		ret = sanitize_ptr_alu(env, insn, ptr_reg, off_reg, dst_reg);
 		if (ret < 0) {
 			verbose(env, "R%d tried to add from different maps, paths, or prohibited types\n", dst);
 			return ret;
@@ -5657,7 +5658,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
 		}
 		break;
 	case BPF_SUB:
-		ret = sanitize_ptr_alu(env, insn, ptr_reg, dst_reg, smin_val < 0);
+		ret = sanitize_ptr_alu(env, insn, ptr_reg, off_reg, dst_reg);
 		if (ret < 0) {
 			verbose(env, "R%d tried to sub from different maps, paths, or prohibited types\n", dst);
 			return ret;
-- 
2.30.2