mirror of https://gitee.com/openkylin/linux.git
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* linux/fs/ext2/xattr_trusted.c
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* Handler for trusted extended attributes.
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*
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* Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
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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/capability.h>
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include "xattr.h"
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static size_t
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ext2_xattr_trusted_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 int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
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const size_t total_len = prefix_len + name_len + 1;
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if (!capable(CAP_SYS_ADMIN))
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return 0;
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if (list && total_len <= list_size) {
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memcpy(list, XATTR_TRUSTED_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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ext2_xattr_trusted_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 ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
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buffer, size);
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}
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static int
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ext2_xattr_trusted_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 ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
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value, size, flags);
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}
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struct xattr_handler ext2_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.list = ext2_xattr_trusted_list,
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.get = ext2_xattr_trusted_get,
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.set = ext2_xattr_trusted_set,
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};
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