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https://github.com/LineageOS/android_kernel_fxtec_sm6115.git
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252813af78
This is in preparation to add a helper for BPF LSM programs to use IMA hashes when attached to LSM hooks. There are LSM hooks like inode_unlink which do not have a struct file * argument and cannot use the existing ima_file_hash API. An inode based API is, therefore, useful in LSM based detections like an executable trying to delete itself which rely on the inode_unlink LSM hook. Moreover, the ima_file_hash function does nothing with the struct file pointer apart from calling file_inode on it and converting it to an inode. Change-Id: I8ac13cf584464d43809539a12b20826b570cc2a2 Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Mimi Zohar <zohar@linux.ibm.com> Link: https://lore.kernel.org/bpf/20201124151210.1081188-2-kpsingh@chromium.org
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
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* Copyright (C) 2008 IBM Corporation
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* Author: Mimi Zohar <zohar@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*/
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#ifndef _LINUX_IMA_H
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#define _LINUX_IMA_H
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/kexec.h>
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struct linux_binprm;
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#ifdef CONFIG_IMA
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extern int ima_bprm_check(struct linux_binprm *bprm);
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extern int ima_file_check(struct file *file, int mask);
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extern void ima_post_create_tmpfile(struct inode *inode);
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extern void ima_file_free(struct file *file);
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extern int ima_file_mmap(struct file *file, unsigned long reqprot,
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unsigned long prot, unsigned long flags);
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extern int ima_load_data(enum kernel_load_data_id id);
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extern int ima_read_file(struct file *file, enum kernel_read_file_id id);
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extern int ima_post_read_file(struct file *file, void *buf, loff_t size,
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enum kernel_read_file_id id);
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extern void ima_post_path_mknod(struct dentry *dentry);
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extern int ima_file_hash(struct file *file, char *buf, size_t buf_size);
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extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size);
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extern void ima_kexec_cmdline(const void *buf, int size);
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#ifdef CONFIG_IMA_KEXEC
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extern void ima_add_kexec_buffer(struct kimage *image);
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#endif
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#else
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static inline int ima_bprm_check(struct linux_binprm *bprm)
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{
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return 0;
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}
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static inline int ima_file_check(struct file *file, int mask)
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{
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return 0;
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}
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static inline void ima_post_create_tmpfile(struct inode *inode)
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{
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}
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static inline void ima_file_free(struct file *file)
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{
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return;
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}
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static inline int ima_file_mmap(struct file *file, unsigned long reqprot,
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unsigned long prot, unsigned long flags)
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{
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return 0;
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}
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static inline int ima_load_data(enum kernel_load_data_id id)
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{
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return 0;
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}
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static inline int ima_read_file(struct file *file, enum kernel_read_file_id id)
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{
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return 0;
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}
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static inline int ima_post_read_file(struct file *file, void *buf, loff_t size,
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enum kernel_read_file_id id)
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{
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return 0;
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}
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static inline void ima_post_path_mknod(struct dentry *dentry)
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{
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return;
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}
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static inline int ima_file_hash(struct file *file, char *buf, size_t buf_size)
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{
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return -EOPNOTSUPP;
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}
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static inline int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
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{
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return -EOPNOTSUPP;
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}
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static inline void ima_kexec_cmdline(const void *buf, int size) {}
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#endif /* CONFIG_IMA */
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#ifndef CONFIG_IMA_KEXEC
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struct kimage;
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static inline void ima_add_kexec_buffer(struct kimage *image)
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{}
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#endif
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#ifdef CONFIG_IMA_APPRAISE
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extern bool is_ima_appraise_enabled(void);
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extern void ima_inode_post_setattr(struct dentry *dentry);
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extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
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const void *xattr_value, size_t xattr_value_len);
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extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name);
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#else
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static inline bool is_ima_appraise_enabled(void)
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{
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return 0;
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}
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static inline void ima_inode_post_setattr(struct dentry *dentry)
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{
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return;
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}
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static inline int ima_inode_setxattr(struct dentry *dentry,
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const char *xattr_name,
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const void *xattr_value,
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size_t xattr_value_len)
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{
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return 0;
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}
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static inline int ima_inode_removexattr(struct dentry *dentry,
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const char *xattr_name)
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{
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return 0;
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}
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#endif /* CONFIG_IMA_APPRAISE */
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#endif /* _LINUX_IMA_H */
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