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bpf: remove the verifier ops from program structure

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Since the verifier ops don't have to be associated with
the program for its entire lifetime we can move it to
verifier's struct bpf_verifier_env.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-10-16 16:40:54 -07:00 committed by David S. Miller
parent 7de16e3a35
commit 00176a34d9
4 changed files with 18 additions and 17 deletions
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1
include/linux/bpf.h
View File

@ -188,7 +188,6 @@ struct bpf_prog_aux {
struct latch_tree_node ksym_tnode;
struct list_head ksym_lnode;
const struct bpf_prog_ops *ops;
const struct bpf_verifier_ops *vops;
struct bpf_map **used_maps;
struct bpf_prog *prog;
struct user_struct *user;

1
include/linux/bpf_verifier.h
View File

@ -141,6 +141,7 @@ struct bpf_ext_analyzer_ops {
*/
struct bpf_verifier_env {
struct bpf_prog *prog; /* eBPF program being verified */
const struct bpf_verifier_ops *ops;
struct bpf_verifier_stack_elem *head; /* stack of verifier states to be processed */
int stack_size; /* number of states to be processed */
bool strict_alignment; /* perform strict pointer alignment checks */

10
kernel/bpf/syscall.c
View File

@ -748,22 +748,12 @@ static const struct bpf_prog_ops * const bpf_prog_types[] = {
#undef BPF_MAP_TYPE
};
static const struct bpf_verifier_ops * const bpf_verifier_ops[] = {
#define BPF_PROG_TYPE(_id, _name) \
[_id] = & _name ## _verifier_ops,
#define BPF_MAP_TYPE(_id, _ops)
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
#undef BPF_MAP_TYPE
};
static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
{
if (type >= ARRAY_SIZE(bpf_prog_types) || !bpf_prog_types[type])
return -EINVAL;
prog->aux->ops = bpf_prog_types[type];
prog->aux->vops = bpf_verifier_ops[type];
prog->type = type;
return 0;
}

23
kernel/bpf/verifier.c
View File

@ -23,6 +23,15 @@
#include "disasm.h"
static const struct bpf_verifier_ops * const bpf_verifier_ops[] = {
#define BPF_PROG_TYPE(_id, _name) \
[_id] = & _name ## _verifier_ops,
#define BPF_MAP_TYPE(_id, _ops)
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
#undef BPF_MAP_TYPE
};
/* bpf_check() is a static code analyzer that walks eBPF program
* instruction by instruction and updates register/stack state.
* All paths of conditional branches are analyzed until 'bpf_exit' insn.
@ -856,8 +865,8 @@ static int check_ctx_access(struct bpf_verifier_env *env, int insn_idx, int off,
*reg_type = info.reg_type;
return 0;
}
} else if (env->prog->aux->vops->is_valid_access &&
env->prog->aux->vops->is_valid_access(off, size, t, &info)) {
} else if (env->ops->is_valid_access &&
env->ops->is_valid_access(off, size, t, &info)) {
/* A non zero info.ctx_field_size indicates that this field is a
* candidate for later verifier transformation to load the whole
* field and then apply a mask when accessed with a narrower
@ -1565,8 +1574,8 @@ static int check_call(struct bpf_verifier_env *env, int func_id, int insn_idx)
return -EINVAL;
}
if (env->prog->aux->vops->get_func_proto)
fn = env->prog->aux->vops->get_func_proto(func_id);
if (env->ops->get_func_proto)
fn = env->ops->get_func_proto(func_id);
if (!fn) {
verbose(env, "unknown func %s#%d\n", func_id_name(func_id),
@ -4035,7 +4044,7 @@ static struct bpf_prog *bpf_patch_insn_data(struct bpf_verifier_env *env, u32 of
*/
static int convert_ctx_accesses(struct bpf_verifier_env *env)
{
const struct bpf_verifier_ops *ops = env->prog->aux->vops;
const struct bpf_verifier_ops *ops = env->ops;
int i, cnt, size, ctx_field_size, delta = 0;
const int insn_cnt = env->prog->len;
struct bpf_insn insn_buf[16], *insn;
@ -4236,7 +4245,7 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
insn = new_prog->insnsi + i + delta;
}
patch_call_imm:
fn = prog->aux->vops->get_func_proto(insn->imm);
fn = env->ops->get_func_proto(insn->imm);
/* all functions that have prototype and verifier allowed
* programs to call them, must be real in-kernel functions
*/
@ -4294,6 +4303,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr)
if (!env->insn_aux_data)
goto err_free_env;
env->prog = *prog;
env->ops = bpf_verifier_ops[env->prog->type];
/* grab the mutex to protect few globals used by verifier */
mutex_lock(&bpf_verifier_lock);
@ -4406,6 +4416,7 @@ int bpf_analyzer(struct bpf_prog *prog, const struct bpf_ext_analyzer_ops *ops,
if (!env->insn_aux_data)
goto err_free_env;
env->prog = prog;
env->ops = bpf_verifier_ops[env->prog->type];
env->analyzer_ops = ops;
env->analyzer_priv = priv;