函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:security\smack\smack_lsm.c Create Date:2022-07-27 20:49:34
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/**
 * smack_inode_link - Smack check on link
 * @old_dentry: the existing object
 * @dir: unused
 * @new_dentry: the new object
 *
 * Returns 0 if access is permitted, an error code otherwise
 */
static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
                struct dentry *new_dentry)
{
    struct smack_known *isp;
    struct smk_audit_info ad;
    int rc;
 
    smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
    smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
 
    isp = smk_of_inode(d_backing_inode(old_dentry));
    rc = smk_curacc(isp, MAY_WRITE, &ad);
    rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
 
    if (rc == 0 && d_is_positive(new_dentry)) {
        isp = smk_of_inode(d_backing_inode(new_dentry));
        smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
        rc = smk_curacc(isp, MAY_WRITE, &ad);
        rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
    }
 
    return rc;
}