ChangeSet 1.954, 2003/01/16 14:23:59-08:00, sds@epoch.ncsc.mil [PATCH] Replace inode_post_lookup hook with d_instantiate hook This patch removes the security_inode_post_lookup hook entirely and adds a security_d_instantiate hook call to the d_instantiate function and the d_splice_alias function. The inode_post_lookup hook was subject to races since the inode is already accessible through the dcache before it is called, didn't handle filesystems that directly populate the dcache, and wasn't always called in the desired context (e.g. for pipe, shmem, and devpts inodes). The d_instantiate hook enables initialization of the inode security information. This hook is used by SELinux and by DTE to setup the inode security state, and eliminated the need for the inode_precondition function in SELinux. diff -Nru a/fs/dcache.c b/fs/dcache.c --- a/fs/dcache.c Thu Jan 16 15:07:30 2003 +++ b/fs/dcache.c Thu Jan 16 15:07:30 2003 @@ -25,6 +25,7 @@ #include #include #include +#include #define DCACHE_PARANOIA 1 /* #define DCACHE_DEBUG 1 */ @@ -699,6 +700,7 @@ void d_instantiate(struct dentry *entry, struct inode * inode) { if (!list_empty(&entry->d_alias)) BUG(); + security_d_instantiate(entry, inode); spin_lock(&dcache_lock); if (inode) list_add(&entry->d_alias, &inode->i_dentry); @@ -825,6 +827,7 @@ struct dentry *new = NULL; if (inode && S_ISDIR(inode->i_mode)) { + security_d_instantiate(dentry, inode); spin_lock(&dcache_lock); if (!list_empty(&inode->i_dentry)) { new = list_entry(inode->i_dentry.next, struct dentry, d_alias); diff -Nru a/fs/namei.c b/fs/namei.c --- a/fs/namei.c Thu Jan 16 15:07:30 2003 +++ b/fs/namei.c Thu Jan 16 15:07:30 2003 @@ -372,10 +372,8 @@ result = dir->i_op->lookup(dir, dentry); if (result) dput(dentry); - else { + else result = dentry; - security_inode_post_lookup(dir, result); - } } up(&dir->i_sem); return result; @@ -916,10 +914,9 @@ if (!new) goto out; dentry = inode->i_op->lookup(inode, new); - if (!dentry) { + if (!dentry) dentry = new; - security_inode_post_lookup(inode, dentry); - } else + else dput(new); } out: diff -Nru a/include/linux/security.h b/include/linux/security.h --- a/include/linux/security.h Thu Jan 16 15:07:30 2003 +++ b/include/linux/security.h Thu Jan 16 15:07:30 2003 @@ -339,10 +339,6 @@ * @mnt is the vfsmount where the dentry was looked up * @dentry contains the dentry structure for the file. * Return 0 if permission is granted. - * @inode_post_lookup: - * Set the security attributes for a file after it has been looked up. - * @inode contains the inode structure for parent directory. - * @d contains the dentry structure for the file. * @inode_delete: * @inode contains the inode structure for deleted inode. * This hook is called when a deleted inode is released (i.e. an inode @@ -868,7 +864,6 @@ int (*inode_permission_lite) (struct inode *inode, int mask); int (*inode_setattr) (struct dentry *dentry, struct iattr *attr); int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry); - void (*inode_post_lookup) (struct inode *inode, struct dentry *d); void (*inode_delete) (struct inode *inode); int (*inode_setxattr) (struct dentry *dentry, char *name, void *value, size_t size, int flags); @@ -953,6 +948,8 @@ struct security_operations *ops); int (*unregister_security) (const char *name, struct security_operations *ops); + + void (*d_instantiate) (struct dentry * dentry, struct inode * inode); }; /* global variables */ @@ -1246,12 +1243,6 @@ return security_ops->inode_getattr (mnt, dentry); } -static inline void security_inode_post_lookup (struct inode *inode, - struct dentry *dentry) -{ - security_ops->inode_post_lookup (inode, dentry); -} - static inline void security_inode_delete (struct inode *inode) { security_ops->inode_delete (inode); @@ -1549,6 +1540,11 @@ return security_ops->sem_semop(sma, sops, nsops, alter); } +static inline void security_d_instantiate (struct dentry *dentry, struct inode *inode) +{ + security_ops->d_instantiate (dentry, inode); +} + /* prototypes */ extern int security_scaffolding_startup (void); extern int register_security (struct security_operations *ops); @@ -1828,10 +1824,6 @@ return 0; } -static inline void security_inode_post_lookup (struct inode *inode, - struct dentry *dentry) -{ } - static inline void security_inode_delete (struct inode *inode) { } @@ -2114,6 +2106,9 @@ { return 0; } + +static inline void security_d_instantiate (struct dentry *dentry, struct inode *inode) +{ } #endif /* CONFIG_SECURITY */ diff -Nru a/security/dummy.c b/security/dummy.c --- a/security/dummy.c Thu Jan 16 15:07:30 2003 +++ b/security/dummy.c Thu Jan 16 15:07:30 2003 @@ -311,11 +311,6 @@ return 0; } -static void dummy_inode_post_lookup (struct inode *ino, struct dentry *d) -{ - return; -} - static void dummy_inode_delete (struct inode *ino) { return; @@ -612,6 +607,12 @@ return -EINVAL; } +static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode) +{ + return; +} + + struct security_operations dummy_security_ops; #define set_to_dummy_if_null(ops, function) \ @@ -674,7 +675,6 @@ set_to_dummy_if_null(ops, inode_permission_lite); set_to_dummy_if_null(ops, inode_setattr); set_to_dummy_if_null(ops, inode_getattr); - set_to_dummy_if_null(ops, inode_post_lookup); set_to_dummy_if_null(ops, inode_delete); set_to_dummy_if_null(ops, inode_setxattr); set_to_dummy_if_null(ops, inode_getxattr); @@ -731,5 +731,6 @@ set_to_dummy_if_null(ops, sem_semop); set_to_dummy_if_null(ops, register_security); set_to_dummy_if_null(ops, unregister_security); + set_to_dummy_if_null(ops, d_instantiate); }