函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\crypto\keysetup.c Create Date:2022-07-29 10:57:32
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：fscrypt_setup_v2_file_key

函数原型：static int fscrypt_setup_v2_file_key(struct fscrypt_info *ci, struct fscrypt_master_key *mk)

返回类型：int

参数：

类型参数名称
struct fscrypt_info *ci
struct fscrypt_master_key *mk
180  如果flags按位与FSCRYPT_POLICY_FLAG_DIRECT_KEY则
189  如果非fscrypt_mode_supports_direct_key(Encryption mode used for this inode. It corresponds to either the* contents or filenames encryption mode, depending on the inode type.)则
190  fscrypt_warn(Back-pointer to the inode , "Direct key flag not allowed with %s", friendly_name)
193  返回:负EINVAL
195  返回:setup_per_mode_key(ci, mk, Crypto API transforms for DIRECT_KEY policies, allocated on-demand , HKDF_CONTEXT_DIRECT_KEY, false)
197  否则如果flags按位与FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64则
205  返回:setup_per_mode_key(ci, mk, Crypto API transforms for filesystem-layer implementation of* IV_INO_LBLK_64 policies, allocated on-demand., HKDF_CONTEXT_IV_INO_LBLK_64_KEY, true)
210  err等于HKDF-Expand (RFC 5869 section 2
214  如果err则返回:err
217  err等于Given the per-file key, set up the file's crypto transform object
218  memzero_explicit - Fill a region of memory (e
219  返回:err
调用者
名称描述
setup_file_encryption_keyFind the master key, then set up the inode's actual encryption key.* If the master key is found in the filesystem-level keyring, then the* corresponding 'struct key' is returned in *master_key_ret with* ->mk_secret_sem read-locked