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authorDaniel Borkmann <daniel@iogearbox.net>2015-03-01 12:31:47 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-01 14:05:19 -0500
commit24701ecea76b0b93bd9667486934ec310825f558 (patch)
tree7f658077fea363e89643d95fc808236d748b8431 /kernel/bpf
parent96be4325f443dbbfeb37d2a157675ac0736531a1 (diff)
downloadlinux-next-24701ecea76b0b93bd9667486934ec310825f558.tar.gz
ebpf: move read-only fields to bpf_prog and shrink bpf_prog_aux
is_gpl_compatible and prog_type should be moved directly into bpf_prog as they stay immutable during bpf_prog's lifetime, are core attributes and they can be locked as read-only later on via bpf_prog_select_runtime(). With a bit of rearranging, this also allows us to shrink bpf_prog_aux to exactly 1 cacheline. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/syscall.c7
-rw-r--r--kernel/bpf/verifier.c4
2 files changed, 5 insertions, 6 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 536edc2be307..0d69449acbd0 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -354,10 +354,11 @@ static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
list_for_each_entry(tl, &bpf_prog_types, list_node) {
if (tl->type == type) {
prog->aux->ops = tl->ops;
- prog->aux->prog_type = type;
+ prog->type = type;
return 0;
}
}
+
return -EINVAL;
}
@@ -508,7 +509,7 @@ static int bpf_prog_load(union bpf_attr *attr)
prog->jited = false;
atomic_set(&prog->aux->refcnt, 1);
- prog->aux->is_gpl_compatible = is_gpl;
+ prog->gpl_compatible = is_gpl;
/* find program type: socket_filter vs tracing_filter */
err = find_prog_type(type, prog);
@@ -517,7 +518,6 @@ static int bpf_prog_load(union bpf_attr *attr)
/* run eBPF verifier */
err = bpf_check(prog, attr);
-
if (err < 0)
goto free_used_maps;
@@ -528,7 +528,6 @@ static int bpf_prog_load(union bpf_attr *attr)
bpf_prog_select_runtime(prog);
err = anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, O_RDWR | O_CLOEXEC);
-
if (err < 0)
/* failed to allocate fd */
goto free_used_maps;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 594d341f04db..bdf4192a889b 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -852,7 +852,7 @@ static int check_call(struct verifier_env *env, int func_id)
}
/* eBPF programs must be GPL compatible to use GPL-ed functions */
- if (!env->prog->aux->is_gpl_compatible && fn->gpl_only) {
+ if (!env->prog->gpl_compatible && fn->gpl_only) {
verbose("cannot call GPL only function from proprietary program\n");
return -EINVAL;
}
@@ -1205,7 +1205,7 @@ static int check_ld_abs(struct verifier_env *env, struct bpf_insn *insn)
struct reg_state *reg;
int i, err;
- if (!may_access_skb(env->prog->aux->prog_type)) {
+ if (!may_access_skb(env->prog->type)) {
verbose("BPF_LD_ABS|IND instructions not allowed for this program type\n");
return -EINVAL;
}