linux-kernel - Re: [PATCH] infiniband: remove WARN that is not kernel bug

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Date:   Mon, 21 Nov 2016 11:19:33 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     Valdis.Kletnieks@...edu, dledford@...hat.com, sean.hefty@...el.com,
        Hal Rosenstock <hal.rosenstock@...il.com>, leon@...nel.org,
        linux-rdma@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH] infiniband: remove WARN that is not kernel bug

On Sat, Nov 19, 2016 at 7:57 PM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> On Fri, Nov 18, 2016 at 09:22:42PM -0500, Valdis.Kletnieks@...edu wrote:
>> On Fri, 18 Nov 2016 12:24:37 +0100, Dmitry Vyukov said:
>> > WARNINGs mean kernel bugs.
>> > The one in ucma_write() points to user programming error
>> > or a malicious attempt. This is not a kernel bug, remove it.
>>
>> > -   if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
>> > +   if (!ib_safe_file_access(filp))
>> >             return -EACCES;
>>
>> In that case, wouldn't this be better?
>>
>>       if (!ib_safe_file_access(filp)) {
>>               printk_once("Process %d (%s) tried to do something hinky", pid, comm);
>>               return _EACCESS;
>>       }
>>
>> so the sysadmin becomes aware of the malicious attempt?
>
> Yes please

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