Re: sys_gettimeofday racy or not?
From: Chris Friesen (cfriesen_at_nortelnetworks.com)
Date: 06/25/04
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- In reply to: Wichert Akkerman: "sys_gettimeofday racy or not?"
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Date: Fri, 25 Jun 2004 00:53:04 -0400 To: Wichert Akkerman <wichert@wiggy.net>
Wichert Akkerman wrote:
> This just happened to catch my eye and it's probably perfectly
> valid, but if so please educate me on why it is. In kernel/time.c
> sys_gettimeofday() there is this code:
>
> if (unlikely(tz != NULL)) {
> if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
> return -EFAULT;
> }
>
> what prevents sys_tz from being changed while this code runs?
Nothing at all.
I suspect most people don't worry about it, since its use is deprecated. The
man page for gettimeofday() says "The use of the timezone struct is obsolete".
Chris
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- Previous message: Shai Fultheim: "RE: [Lhms-devel] Re: [Lhns-devel] Merging Nonlinear and Numa style memory hotplug"
- In reply to: Wichert Akkerman: "sys_gettimeofday racy or not?"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
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