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

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Message-ID: <ea351ea0-5095-d7ae-5592-ec3bd45c771c@huawei.com>
Date: Thu, 12 Sep 2024 10:53:44 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: 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>, <tglx@...utronix.de>,
	<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 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()?

There was already checks in following code, so it is not necessary to
check NULL or timespec64_valid() in ptp core and its drivers, only the
second patch is needed.

169 int do_sys_settimeofday64(const struct timespec64 *tv, const struct
timezone *tz)
 170 {
 171 >-------static int firsttime = 1;
 172 >-------int error = 0;
 173
 174 >-------if (tv && !timespec64_valid_settod(tv))
 175 >------->-------return -EINVAL;



> 
> Thanks,
> Richard