On Tue, 2007-08-07 at 17:17 -0500, Serge E. Hallyn wrote:
> diff --git a/fs/splice.c b/fs/splice.c
> index e36c003..2df95f3 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -827,6 +827,12 @@ generic_file_splice_write(struct pipe_inode_info *pipe,
> struct file *out,
> ssize_t ret;
> int err;
>
> + mutex_lock(&inode->i_mutex);
> + err = security_inode_killpriv(out->f_path.dentry);
> + mutex_unlock(&inode->i_mutex);
> + if (err)
> + return err;
You are unconditionally taking the i_mutex whether or not you actually
have any capabilities to remove. Normally, removing capabilities due to
a write is something which occurs once every blue moon. Can't you
introduce a heuristic along the lines of should_remove_suid() in order
to optimise away the common case?
In addition, if you need to remove both the capabilities and the suid
bits, then it should be unnecessary to take the i_mutex twice.
> +
> err = should_remove_suid(out->f_path.dentry);
> if (unlikely(err)) {
> mutex_lock(&inode->i_mutex);
Trond
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