linux-kernel - Re: [PATCH -next v3 1/2] posix-timers: Check timespec64 before call clock

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Message-ID: <875xr3btou.ffs@tglx>
Date: Tue, 10 Sep 2024 14:05:05 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Jinjie Ruan <ruanjinjie@...wei.com>, Richard Cochran
 <richardcochran@...il.com>
Cc: bryan.whitehead@...rochip.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, anna-maria@...utronix.de,
 frederic@...nel.org, UNGLinuxDriver@...rochip.com, mbenes@...e.cz,
 jstultz@...gle.com, andrew@...n.ch, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v3 1/2] posix-timers: Check timespec64 before call
 clock_set()

On Tue, Sep 10 2024 at 19:23, Jinjie Ruan wrote:
> On 2024/9/9 23:19, Richard Cochran wrote:
>> On Mon, Sep 09, 2024 at 03:41:23PM +0800, Jinjie Ruan wrote:
>>> diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
>>> index 1cc830ef93a7..34deec619e17 100644
>>> --- a/kernel/time/posix-timers.c
>>> +++ b/kernel/time/posix-timers.c
>>> @@ -1137,6 +1137,9 @@ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
>>>  	if (get_timespec64(&new_tp, tp))
>>>  		return -EFAULT;
>>>  
>>> +	if (!timespec64_valid(&new_tp))
>>> +		return -ERANGE;
>> 
>> Why not use timespec64_valid_settod()?
>
> It seems more limited and is only used in timekeeping or
> do_sys_settimeofday64().

For a very good reason.

> And the timespec64_valid() is looser and wider used, which I think is
> more appropriate here.

Can you please stop this handwaving and provide proper technical
arguments?

Why would PTP have less strict requirements than settimeofday()?

Thanks,

        tglx