btf_check_meta

Name:btf_check_meta

Proto:static s32 btf_check_meta(struct btf_verifier_env *env, const struct btf_type *t, u32 meta_left)

Type:s32

Parameter:

Type	Parameter	Name
struct btf_verifier_env *	env
const struct btf_type *	t
u32	meta_left

3003

saved_meta_left = meta_left

3006

If meta_left < size of t Then

3007

btf_verifier_log(env, "[%u] meta_left:%u meta_needed:%zu", log_type_id, meta_left, size of t )

3009

Return -EINVAL

3011

meta_left -= size of t

3013

If "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused * bits 24-27: kind (e.g. int, ptr, array...etc) * bits 28-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd & ~BTF_INFO_MASK Then

3014

btf_verifier_log(env, "[%u] Invalid btf_info:%x", log_type_id, "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused * bits 24-27: kind (e.g. int, ptr, array...etc) * bits 28-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd)

3016

Return -EINVAL

3019

If BTF_INFO_KIND( "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused * bits 24-27: kind (e.g. int, ptr, array...etc) * bits 28-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd) > BTF_KIND_MAX || BTF_INFO_KIND( "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused * bits 24-27: kind (e.g. int, ptr, array...etc) * bits 28-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd) == Unknown Then

3021

btf_verifier_log(env, "[%u] Invalid kind:%u", log_type_id, BTF_INFO_KIND( "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused * bits 24-27: kind (e.g. int, ptr, array...etc) * bits 28-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd))

3023

Return -EINVAL

3026

If Not btf_name_offset_valid(btf, name_off) Then

3027

btf_verifier_log(env, "[%u] Invalid name_offset:%u", log_type_id, name_off)

3029

Return -EINVAL

3032

var_meta_size = check_meta(env, t, meta_left)

3033

If var_meta_size < 0 Then Return var_meta_size

3036

meta_left -= var_meta_size

3038

Return saved_meta_left - meta_left

**Caller**
Name	Describe
btf_check_all_metas

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