fs/jffs2/security.c

Source file repositories/reference/linux-study-clean/fs/jffs2/security.c

File Facts

System
Linux kernel
Corpus path
fs/jffs2/security.c
Extension
.c
Size
2024 bytes
Lines
74
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/mtd/mtd.h>
#include <linux/security.h>
#include "nodelist.h"

/* ---- Initial Security Label(s) Attachment callback --- */
static int jffs2_initxattrs(struct inode *inode,
			    const struct xattr *xattr_array, void *fs_info)
{
	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
					xattr->name, xattr->value,
					xattr->value_len, 0);
		if (err < 0)
			break;
	}
	return err;
}

/* ---- Initial Security Label(s) Attachment ----------- */
int jffs2_init_security(struct inode *inode, struct inode *dir,
			const struct qstr *qstr)
{
	return security_inode_init_security(inode, dir, qstr,
					    &jffs2_initxattrs, NULL);
}

/* ---- XATTR Handler for "security.*" ----------------- */
static int jffs2_security_getxattr(const struct xattr_handler *handler,
				   struct dentry *unused, struct inode *inode,
				   const char *name, void *buffer, size_t size)
{
	return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY,
				 name, buffer, size);
}

static int jffs2_security_setxattr(const struct xattr_handler *handler,
				   struct mnt_idmap *idmap,
				   struct dentry *unused, struct inode *inode,
				   const char *name, const void *buffer,
				   size_t size, int flags)
{
	return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
				 name, buffer, size, flags);
}

const struct xattr_handler jffs2_security_xattr_handler = {
	.prefix = XATTR_SECURITY_PREFIX,
	.set = jffs2_security_setxattr,
	.get = jffs2_security_getxattr
};

Annotation

Implementation Notes