xattr_trusted.c

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#include "reiserfs.h"
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "xattr.h"
#include <asm/uaccess.h>

static int
trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
        int handler_flags)
{
    if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
        return -EINVAL;

    if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
        return -EPERM;

    return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
}

static int
trusted_set(struct dentry *dentry, const char *name, const void *buffer,
        size_t size, int flags, int handler_flags)
{
    if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
        return -EINVAL;

    if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
        return -EPERM;

    return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
}

static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
               const char *name, size_t name_len, int handler_flags)
{
    const size_t len = name_len + 1;

    if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
        return 0;

    if (list && len <= list_size) {
        memcpy(list, name, name_len);
        list[name_len] = '\0';
    }
    return len;
}

const struct xattr_handler reiserfs_xattr_trusted_handler = {
    .prefix = XATTR_TRUSTED_PREFIX,
    .get = trusted_get,
    .set = trusted_set,
    .list = trusted_list,
};