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bpf: Move off_reg into sanitize_ptr_alu

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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@iogearbox.net>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2021-03-22 15:45:52 +01:00
parent 9601148392
commit 6f55b2f2a1
1 changed files with 5 additions and 4 deletions
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9
kernel/bpf/verifier.c
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@ -5929,11 +5929,12 @@ 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;
@ -6110,7 +6111,7 @@ 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;
@ -6165,7 +6166,7 @@ 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;