函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\btf.c Create Date:2022-07-27 14:36:53
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：btf_enum_check_kflag_member

函数原型：static int btf_enum_check_kflag_member(struct btf_verifier_env *env, const struct btf_type *struct_type, const struct btf_member *member, const struct btf_type *member_type)

返回类型：int

参数：

类型参数名称
struct btf_verifier_env *env
const struct btf_type *struct_type
const struct btf_member *member
const struct btf_type *member_type
2401  int_bitsize等于sizeof(int)乘BITS_PER_BYTE
2403  struct_bits_off等于BTF_MEMBER_BIT_OFFSET(If the type info kind_flag is set, the btf_member offset* contains both member bitfield size and bit offset. The* bitfield size is set for bitfield members. If the type* info kind_flag is not set, the offset contains only bit* offset.)
2404  nr_bits等于If the struct/union type info kind_flag is set, the* following two macros are used to access bitfield_size* and bit_offset from btf_member.offset.(If the type info kind_flag is set, the btf_member offset* contains both member bitfield size and bit offset. The* bitfield size is set for bitfield members. If the type* info kind_flag is not set, the offset contains only bit* offset.)
2405  如果非nr_bits则
2406  如果BITS_PER_BYTE_MASKED(struct_bits_off)则
2407  btf_verifier_log_member(env, struct_type, member, "Member is not byte aligned")
2409  返回:负EINVAL
2412  nr_bits等于int_bitsize
2413  否则如果nr_bits大于int_bitsize则
2414  btf_verifier_log_member(env, struct_type, member, "Invalid member bitfield_size")
2416  返回:负EINVAL
2419  struct_size等于size
2420  bytes_end等于BITS_ROUNDUP_BYTES(struct_bits_off + nr_bits)
2421  如果struct_size小于bytes_end则
2422  btf_verifier_log_member(env, struct_type, member, "Member exceeds struct_size")
2424  返回:负EINVAL
2427  返回:0