diff options
| -rw-r--r-- | fs/fuse/dir.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 1a7927c38bbb..31145d625a61 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1701,16 +1701,40 @@ error: static int fuse_setattr(struct dentry *entry, struct iattr *attr) { struct inode *inode = d_inode(entry); + struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; int ret; if (!fuse_allow_current_process(get_fuse_conn(inode))) return -EACCES; - if (attr->ia_valid & ATTR_FILE) - ret = fuse_do_setattr(inode, attr, attr->ia_file); - else - ret = fuse_do_setattr(inode, attr, NULL); + if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { + int kill; + + attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | + ATTR_MODE); + /* + * ia_mode calculation may have used stale i_mode. Refresh and + * recalculate. + */ + ret = fuse_do_getattr(inode, NULL, file); + if (ret) + return ret; + + attr->ia_mode = inode->i_mode; + kill = should_remove_suid(entry); + if (kill & ATTR_KILL_SUID) { + attr->ia_valid |= ATTR_MODE; + attr->ia_mode &= ~S_ISUID; + } + if (kill & ATTR_KILL_SGID) { + attr->ia_valid |= ATTR_MODE; + attr->ia_mode &= ~S_ISGID; + } + } + if (!attr->ia_valid) + return 0; + ret = fuse_do_setattr(inode, attr, file); if (!ret) { /* Directory mode changed, may need to revalidate access */ if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) |