diff options
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/namei.c b/fs/namei.c index 68921d9b5302..94a5e60779f9 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -232,6 +232,7 @@ int generic_permission(struct inode *inode, int mask, /* * Searching includes executable on directories, else just read. */ + mask &= MAY_READ | MAY_WRITE | MAY_EXEC; if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE))) if (capable(CAP_DAC_READ_SEARCH)) return 0; @@ -560,6 +561,7 @@ static __always_inline int __do_follow_link(struct path *path, struct nameidata dget(dentry); } mntget(path->mnt); + nd->last_type = LAST_BIND; cookie = dentry->d_inode->i_op->follow_link(dentry, nd); error = PTR_ERR(cookie); if (!IS_ERR(cookie)) { @@ -1602,11 +1604,12 @@ struct file *do_filp_open(int dfd, const char *pathname, struct file *filp; struct nameidata nd; int error; - struct path path, save; + struct path path; struct dentry *dir; int count = 0; int will_truncate; int flag = open_to_namei_flags(open_flag); + int force_reval = 0; /* * O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only @@ -1618,7 +1621,7 @@ struct file *do_filp_open(int dfd, const char *pathname, open_flag |= O_DSYNC; if (!acc_mode) - acc_mode = MAY_OPEN | ACC_MODE(flag); + acc_mode = MAY_OPEN | ACC_MODE(open_flag); /* O_TRUNC implies we need access checks for write permissions */ if (flag & O_TRUNC) @@ -1658,9 +1661,12 @@ struct file *do_filp_open(int dfd, const char *pathname, /* * Create - we need to know the parent. */ +reval: error = path_init(dfd, pathname, LOOKUP_PARENT, &nd); if (error) return ERR_PTR(error); + if (force_reval) + nd.flags |= LOOKUP_REVAL; error = path_walk(pathname, &nd); if (error) { if (nd.root.mnt) @@ -1852,17 +1858,7 @@ do_link: error = security_inode_follow_link(path.dentry, &nd); if (error) goto exit_dput; - save = nd.path; - path_get(&save); error = __do_follow_link(&path, &nd); - if (error == -ESTALE) { - /* nd.path had been dropped */ - nd.path = save; - path_get(&nd.path); - nd.flags |= LOOKUP_REVAL; - error = __do_follow_link(&path, &nd); - } - path_put(&save); path_put(&path); if (error) { /* Does someone understand code flow here? Or it is only @@ -1872,6 +1868,10 @@ do_link: release_open_intent(&nd); if (nd.root.mnt) path_put(&nd.root); + if (error == -ESTALE && !force_reval) { + force_reval = 1; + goto reval; + } return ERR_PTR(error); } nd.flags &= ~LOOKUP_PARENT; |