linux-kernel - Re: [PATCH v2 2/2] KEYS: Avoid false positive ENOMEM error on key read

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Message-ID: <a4c92057-c364-965c-a251-02cbe46229b6@redhat.com>
Date:   Tue, 10 Mar 2020 11:45:56 -0400
From:   Waiman Long <longman@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mimi Zohar <zohar@...ux.ibm.com>, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Chris von Recklinghausen <crecklin@...hat.com>
Subject: Re: [PATCH v2 2/2] KEYS: Avoid false positive ENOMEM error on key
 read

On 3/9/20 12:32 PM, David Howells wrote:
> Waiman Long <longman@...hat.com> wrote:
>
>> +			tmpbuf = kmalloc(tbuflen, GFP_KERNEL);
> This would probably be better off using kvmalloc() - otherwise big objects
> have to be constructed from runs of contiguous pages.  But since all we're
> doing is buffering for userspace, we don't care about that.
>
> If you agree, we can address it with an additional patch.
>
> David

That is certainly fine with me. I don't care if the pages are contiguous
or not. Will add a patch 3 for that as suggested.

Thanks,
Longman