Message ID | 20210217181803.3189758-1-yhs@fb.com (mailing list archive) |
---|---|
State | Superseded |
Delegated to: | BPF |
Headers | show |
Series | bpf: add bpf_for_each_map_elem() helper | expand |
Context | Check | Description |
---|---|---|
netdev/cover_letter | success | Link |
netdev/fixes_present | success | Link |
netdev/patch_count | success | Link |
netdev/tree_selection | success | Clearly marked for bpf-next |
netdev/subject_prefix | success | Link |
netdev/cc_maintainers | warning | 6 maintainers not CCed: andrii@kernel.org netdev@vger.kernel.org john.fastabend@gmail.com kpsingh@kernel.org songliubraving@fb.com kafai@fb.com |
netdev/source_inline | success | Was 0 now: 0 |
netdev/verify_signedoff | success | Link |
netdev/module_param | success | Was 0 now: 0 |
netdev/build_32bit | success | Errors and warnings before: 17 this patch: 17 |
netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
netdev/verify_fixes | success | Link |
netdev/checkpatch | warning | WARNING: line length of 81 exceeds 80 columns |
netdev/build_allmodconfig_warn | success | Errors and warnings before: 17 this patch: 17 |
netdev/header_inline | success | Link |
netdev/stable | success | Stable not CCed |
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 11a242932a2c..e3149239b346 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -8591,6 +8591,27 @@ static int push_insn(int t, int w, int e, struct bpf_verifier_env *env, return DONE_EXPLORING; } +static int visit_func_call_insn(int t, int insn_cnt, + struct bpf_insn *insns, + struct bpf_verifier_env *env, + bool visit_callee) +{ + int ret; + + ret = push_insn(t, t + 1, FALLTHROUGH, env, false); + if (ret) + return ret; + + if (t + 1 < insn_cnt) + init_explored_state(env, t + 1); + if (visit_callee) { + init_explored_state(env, t); + ret = push_insn(t, t + insns[t].imm + 1, BRANCH, + env, false); + } + return ret; +} + /* Visits the instruction at index t and returns one of the following: * < 0 - an error occurred * DONE_EXPLORING - the instruction was fully explored @@ -8611,18 +8632,8 @@ static int visit_insn(int t, int insn_cnt, struct bpf_verifier_env *env) return DONE_EXPLORING; case BPF_CALL: - ret = push_insn(t, t + 1, FALLTHROUGH, env, false); - if (ret) - return ret; - - if (t + 1 < insn_cnt) - init_explored_state(env, t + 1); - if (insns[t].src_reg == BPF_PSEUDO_CALL) { - init_explored_state(env, t); - ret = push_insn(t, t + insns[t].imm + 1, BRANCH, - env, false); - } - return ret; + return visit_func_call_insn(t, insn_cnt, insns, env, + insns[t].src_reg == BPF_PSEUDO_CALL); case BPF_JA: if (BPF_SRC(insns[t].code) != BPF_K)
During verifier check_cfg(), all instructions are visited to ensure verifier can handle program control flows. This patch factored out function visit_func_call_insn() so it can be reused in later patch to visit callback function calls. There is no functionality change for this patch. Signed-off-by: Yonghong Song <yhs@fb.com> --- kernel/bpf/verifier.c | 35 +++++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 12 deletions(-)