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

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Message-ID: <315a63f5-712e-c6a0-c447-9dd70253e3aa@huawei.com>
Date: Sat, 14 Sep 2024 17:00:45 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Thomas Gleixner <tglx@...utronix.de>, 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 2024/9/13 18:46, Thomas Gleixner wrote:
> On Thu, Sep 12 2024 at 20:24, Jinjie Ruan wrote:
>> On 2024/9/12 20:04, Thomas Gleixner wrote:
>>> How does this code validate timespecs for clock_settime(clockid) where
>>> clockid != CLOCK_REALTIME?
>>
>> According to the man manual of clock_settime(), the other clockids are
>> not settable.
>>
>> And in Linux kernel code, except for CLOCK_REALTIME which is defined in
>> posix_clocks array, the clock_set() hooks are not defined and will
>> return -EINVAL in SYSCALL_DEFINE2(clock_settime), so the check is not
>> necessary.
> 
> You clearly understand the code you are modifying:
> 
> const struct k_clock clock_posix_dynamic = {
> 	.clock_getres           = pc_clock_getres,
>         .clock_set              = pc_clock_settime, 
> 
> which is what PTP clocks use and that's what this is about, no?

Yes, it uses the dynamic one rather than the static ones.

> 
> Thanks,
> 
>         tglx