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Message-Id: <20210608175931.401585891@linuxfoundation.org>
Date: Tue, 8 Jun 2021 20:27:11 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Frank van der Linden <fllinden@...zon.com>
Subject: [PATCH 4.14 28/47] bpf: Move off_reg into sanitize_ptr_alu
From: Daniel Borkmann <daniel@...earbox.net>
commit 6f55b2f2a1178856c19bbce2f71449926e731914 upstream.
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>
[fllinden@...zon.com: fix minor contextual conflict for 4.14]
Signed-off-by: Frank van der Linden <fllinden@...zon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
kernel/bpf/verifier.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2094,11 +2094,12 @@ static int sanitize_val_alu(struct bpf_v
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;
@@ -2224,7 +2225,7 @@ static int adjust_ptr_min_max_vals(struc
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("R%d tried to add from different maps, paths, or prohibited types\n", dst);
return ret;
@@ -2279,7 +2280,7 @@ static int adjust_ptr_min_max_vals(struc
}
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("R%d tried to sub from different maps, paths, or prohibited types\n", dst);
return ret;
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