78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* linux/fs/ext4/xattr_security.c
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* Handler for storing security labels as extended attributes.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/slab.h>
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#include "ext4_jbd2.h"
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#include "ext4.h"
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#include "xattr.h"
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static size_t
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ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
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const char *name, size_t name_len, int type)
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{
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const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
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const size_t total_len = prefix_len + name_len + 1;
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if (list && total_len <= list_size) {
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memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
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memcpy(list+prefix_len, name, name_len);
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list[prefix_len + name_len] = '\0';
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}
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return total_len;
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}
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static int
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ext4_xattr_security_get(struct dentry *dentry, const char *name,
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void *buffer, size_t size, int type)
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{
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if (strcmp(name, "") == 0)
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return -EINVAL;
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return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
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name, buffer, size);
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}
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static int
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ext4_xattr_security_set(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags, int type)
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{
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if (strcmp(name, "") == 0)
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return -EINVAL;
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return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
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name, value, size, flags);
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}
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int
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ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
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{
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int err;
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size_t len;
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void *value;
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char *name;
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err = security_inode_init_security(inode, dir, &name, &value, &len);
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if (err) {
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if (err == -EOPNOTSUPP)
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return 0;
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return err;
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}
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err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY,
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name, value, len, 0);
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kfree(name);
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kfree(value);
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return err;
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}
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const struct xattr_handler ext4_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.list = ext4_xattr_security_list,
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.get = ext4_xattr_security_get,
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.set = ext4_xattr_security_set,
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};
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