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e40ba6d56b
Replace the fw_read_file_contents with kernel_file_read_from_path(). Although none of the upstreamed LSMs define a kernel_fw_from_file hook, IMA is called by the security function to prevent unsigned firmware from being loaded and to measure/appraise signed firmware, based on policy. Instead of reading the firmware twice, once for measuring/appraising the firmware and again for reading the firmware contents into memory, the kernel_post_read_file() security hook calculates the file hash based on the in memory file buffer. The firmware is read once. This patch removes the LSM kernel_fw_from_file() hook and security call. Changelog v4+: - revert dropped buf->size assignment - reported by Sergey Senozhatsky v3: - remove kernel_fw_from_file hook - use kernel_file_read_from_path() - requested by Luis v2: - reordered and squashed firmware patches - fix MAX firmware size (Kees Cook) Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
85 lines
2.0 KiB
C
85 lines
2.0 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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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, int opened);
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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 prot);
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extern int ima_module_check(struct file *file);
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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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#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, int opened)
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{
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return 0;
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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 prot)
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{
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return 0;
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}
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static inline int ima_module_check(struct file *file)
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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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#endif /* CONFIG_IMA */
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#ifdef CONFIG_IMA_APPRAISE
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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 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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