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vfs: define kernel_read_file_id enumeration

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To differentiate between the kernel_read_file() callers, this patch
defines a new enumeration named kernel_read_file_id and includes the
caller identifier as an argument.

Subsequent patches define READING_KEXEC_IMAGE, READING_KEXEC_INITRAMFS,
READING_FIRMWARE, READING_MODULE, and READING_POLICY.

Changelog v3:
- Replace the IMA specific enumeration with a generic one.

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>
Cc: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Mimi Zohar 2016-01-24 10:07:32 -05:00
parent b44a7dfc6f
commit bc8ca5b92d
5 changed files with 19 additions and 8 deletions
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4
include/linux/lsm_hooks.h
View file

@ -567,6 +567,7 @@
* by the kernel.
* @buf pointer to buffer containing the file contents.
* @size length of the file contents.
* @id kernel read file identifier
* Return 0 if permission is granted.
* @task_fix_setuid:
* Update the module's state after setting one or more of the user
@ -1464,7 +1465,8 @@ union security_list_options {
int (*kernel_fw_from_file)(struct file *file, char *buf, size_t size);
int (*kernel_module_request)(char *kmod_name);
int (*kernel_module_from_file)(struct file *file);
int (*kernel_post_read_file)(struct file *file, char *buf, loff_t size);
int (*kernel_post_read_file)(struct file *file, char *buf, loff_t size,
enum kernel_read_file_id id);
int (*task_fix_setuid)(struct cred *new, const struct cred *old,
int flags);
int (*task_setpgid)(struct task_struct *p, pid_t pgid);