fs: define a string representation of the kernel_read_file_id enumeration (1284ab5b) · Commits · 戴 / test

A string representation of the kernel_read_file_id enumeration is needed for displaying messages (eg. pr_info, auditing) that can be used by multiple LSMs and the integrity subsystem. To simplify keeping the list of strings up to date with the enumeration, this patch defines two new preprocessing macros named __fid_enumify and __fid_stringify to create the enumeration and an array of strings. kernel_read_file_id_str() returns a string based on the enumeration. Signed-off-by:

Mimi Zohar <zohar@linux.vnet.ibm.com> [kees: removed removal of my old version, constified pointer values] Signed-off-by:

Kees Cook <keescook@chromium.org> Signed-off-by:

James Morris <james.l.morris@oracle.com>

include/linux/fs.h

+25 −6

Original line number	Diff line number	Diff line
		@@ -2580,15 +2580,34 @@ static inline void i_readcount_inc(struct inode *inode)
		#endif
		extern int do_pipe_flags(int *, int);

		#define __kernel_read_file_id(id) \
		id(UNKNOWN, unknown) \
		id(FIRMWARE, firmware) \
		id(MODULE, kernel-module) \
		id(KEXEC_IMAGE, kexec-image) \
		id(KEXEC_INITRAMFS, kexec-initramfs) \
		id(POLICY, security-policy) \
		id(MAX_ID, )

		#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
		#define __fid_stringify(dummy, str) #str,

		enum kernel_read_file_id {
		READING_FIRMWARE = 1,
		READING_MODULE,
		READING_KEXEC_IMAGE,
		READING_KEXEC_INITRAMFS,
		READING_POLICY,
		READING_MAX_ID
		__kernel_read_file_id(__fid_enumify)
		};

		static const char * const kernel_read_file_str[] = {
		__kernel_read_file_id(__fid_stringify)
		};

		static inline const char * const kernel_read_file_id_str(enum kernel_read_file_id id)
		{
		if (id < 0 \|\| id >= READING_MAX_ID)
		return kernel_read_file_str[READING_UNKNOWN];

		return kernel_read_file_str[id];
		}

		extern int kernel_read(struct file , loff_t, char , unsigned long);
		extern int kernel_read_file(struct file , void , loff_t , loff_t,
		enum kernel_read_file_id);

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