getxattr: use correct xattr length

[mirror_ubuntu-bionic-kernel.git] / fs / inode.c

diff --git a/fs/inode.c b/fs/inode.c
index 5c1138e9cac060ade60b613efb8ad1826b29ec84..797b4cb3d20bf71393216d964b96ca20d3e8520c 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2008,8 +2008,14 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
        inode->i_uid = current_fsuid();
        if (dir && dir->i_mode & S_ISGID) {
                inode->i_gid = dir->i_gid;
+
+               /* Directories are special, and always inherit S_ISGID */
                if (S_ISDIR(mode))
                        mode |= S_ISGID;
+               else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
+                        !in_group_p(inode->i_gid) &&
+                        !capable_wrt_inode_uidgid(dir, CAP_FSETID))
+                       mode &= ~S_ISGID;
        } else
                inode->i_gid = current_fsgid();
        inode->i_mode = mode;