linux-kernel - Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to ssize

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Date:   Wed, 8 Jun 2022 08:57:33 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>
Cc:     Sasha Levin <sashal@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, rburanyi@...gle.com,
        Greg Thelen <gthelen@...gle.com>, viro@...iv.linux.org.uk,
        kexec mailing list <kexec@...ts.infradead.org>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] fs/kernel_read_file: Allow to read files up-to
 ssize_t

On 06/07/22 at 11:52am, Pasha Tatashin wrote:
> On Sun, Jun 5, 2022 at 10:45 PM Baoquan He <bhe@...hat.com> wrote:
> >
> > On 05/27/22 at 02:55am, Pasha Tatashin wrote:
> > > Currently, the maximum file size that is supported is 2G. This may be
> > > too small in some cases. For example, kexec_file_load() system call
> > > loads initramfs. In some netboot cases initramfs can be rather large.
> > >
> > > Allow to use up-to ssize_t bytes. The callers still can limit the
> > > maximum file size via buf_size.
> >
> > If we really met initramfs bigger than 2G, it's reasonable to increase
> > the limit. While wondering why we should take sszie_t, but not size_t.
> 
> ssize_t instead of size_t so we can return errors as negative values.

Makes sense. Thanks.