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bpf: Rename bpf_reg_state variables 

Using "reg" for an array of bpf_reg_state and "reg[i + 1]" for an
individual bpf_reg_state is error-prone and verbose. Use "regs" for the
former and "reg" for the latter as other code nearby does.

Signed-off-by: Dmitrii Banshchikov <me@ubique.spb.ru>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210212205642.620788-2-me@ubique.spb.ru
This commit is contained in:
Dmitrii Banshchikov 2021-02-13 00:56:39 +04:00 committed by Alexei Starovoitov
parent b62eba5632
commit feb4adfad5
1 changed files with 12 additions and 8 deletions
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20
kernel/bpf/btf.c
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@ -5291,7 +5291,7 @@ int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *pr
* Only PTR_TO_CTX and SCALAR_VALUE states are recognized.
*/
int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
struct bpf_reg_state *reg)
struct bpf_reg_state *regs)
{
struct bpf_verifier_log *log = &env->log;
struct bpf_prog *prog = env->prog;
@ -5337,17 +5337,19 @@ int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
* verifier sees.
*/
for (i = 0; i < nargs; i++) {
struct bpf_reg_state *reg = &regs[i + 1];
t = btf_type_by_id(btf, args[i].type);
while (btf_type_is_modifier(t))
t = btf_type_by_id(btf, t->type);
if (btf_type_is_int(t) || btf_type_is_enum(t)) {
if (reg[i + 1].type == SCALAR_VALUE)
if (reg->type == SCALAR_VALUE)
continue;
bpf_log(log, "R%d is not a scalar\n", i + 1);
goto out;
}
if (btf_type_is_ptr(t)) {
if (reg[i + 1].type == SCALAR_VALUE) {
if (reg->type == SCALAR_VALUE) {
bpf_log(log, "R%d is not a pointer\n", i + 1);
goto out;
}
@ -5355,13 +5357,13 @@ int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
* is passing PTR_TO_CTX.
*/
if (btf_get_prog_ctx_type(log, btf, t, prog->type, i)) {
if (reg[i + 1].type != PTR_TO_CTX) {
if (reg->type != PTR_TO_CTX) {
bpf_log(log,
"arg#%d expected pointer to ctx, but got %s\n",
i, btf_kind_str[BTF_INFO_KIND(t->info)]);
goto out;
}
if (check_ctx_reg(env, &reg[i + 1], i + 1))
if (check_ctx_reg(env, reg, i + 1))
goto out;
continue;
}
@ -5388,7 +5390,7 @@ out:
* (either PTR_TO_CTX or SCALAR_VALUE).
*/
int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
struct bpf_reg_state *reg)
struct bpf_reg_state *regs)
{
struct bpf_verifier_log *log = &env->log;
struct bpf_prog *prog = env->prog;
@ -5459,16 +5461,18 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
* Only PTR_TO_CTX and SCALAR are supported atm.
*/
for (i = 0; i < nargs; i++) {
struct bpf_reg_state *reg = &regs[i + 1];
t = btf_type_by_id(btf, args[i].type);
while (btf_type_is_modifier(t))
t = btf_type_by_id(btf, t->type);
if (btf_type_is_int(t) || btf_type_is_enum(t)) {
reg[i + 1].type = SCALAR_VALUE;
reg->type = SCALAR_VALUE;
continue;
}
if (btf_type_is_ptr(t) &&
btf_get_prog_ctx_type(log, btf, t, prog_type, i)) {
reg[i + 1].type = PTR_TO_CTX;
reg->type = PTR_TO_CTX;
continue;
}
bpf_log(log, "Arg#%d type %s in %s() is not supported yet.\n",