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bpf: verifier: record original instruction index

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The communication between the verifier and advanced JITs is based
on instruction indexes.  We have to keep them stable throughout
the optimizations otherwise referring to a particular instruction
gets messy quickly.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jakub Kicinski
2019-01-22 22:45:23 -08:00
committed by Alexei Starovoitov
parent cb05077508
commit 9e4c24e7ee
2 changed files with 6 additions and 3 deletions
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8
kernel/bpf/verifier.c
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@@ -7371,7 +7371,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
{
struct bpf_verifier_env *env;
struct bpf_verifier_log *log;
int ret = -EINVAL;
int i, len, ret = -EINVAL;
bool is_priv;
/* no program is valid */
@@ -7386,12 +7386,14 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
return -ENOMEM;
log = &env->log;
len = (*prog)->len;
env->insn_aux_data =
vzalloc(array_size(sizeof(struct bpf_insn_aux_data),
(*prog)->len));
vzalloc(array_size(sizeof(struct bpf_insn_aux_data), len));
ret = -ENOMEM;
if (!env->insn_aux_data)
goto err_free_env;
for (i = 0; i < len; i++)
env->insn_aux_data[i].orig_idx = i;
env->prog = *prog;
env->ops = bpf_verifier_ops[env->prog->type];