diff options
| -rw-r--r-- | fs/nfsd/vfs.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 1d0406c31a4..a3a291f771f 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -359,24 +359,25 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, DQUOT_INIT(inode); } + /* sanitize the mode change */ if (iap->ia_valid & ATTR_MODE) { iap->ia_mode &= S_IALLUGO; iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); - /* if changing uid/gid revoke setuid/setgid in mode */ - if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) { - iap->ia_valid |= ATTR_KILL_PRIV; + } + + /* Revoke setuid/setgid on chown */ + if (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || + ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)) { + iap->ia_valid |= ATTR_KILL_PRIV; + if (iap->ia_valid & ATTR_MODE) { + /* we're setting mode too, just clear the s*id bits */ iap->ia_mode &= ~S_ISUID; + if (iap->ia_mode & S_IXGRP) + iap->ia_mode &= ~S_ISGID; + } else { + /* set ATTR_KILL_* bits and let VFS handle it */ + iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); } - if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) - iap->ia_mode &= ~S_ISGID; - } else { - /* - * Revoke setuid/setgid bit on chown/chgrp - */ - if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) - iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV; - if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) - iap->ia_valid |= ATTR_KILL_SGID; } /* Change the attributes. */ |