Re: [PATCH] binfmt_elf: core dump masking support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue 2007-01-23 13:42:00, Kawai, Hidehiro wrote:
> Hi,
> 
> >>>(run echo 1 > coremask, echo 0 > coremask in a loop while dumping
> >>>core. Do you have enough locking to make it work as expected?)
> >>
> >>Currently, any lock isn't acquired.  But I think the kernel only
> >>have to preserve the coremask setting in a local variable at the
> >>begining of core dumping.  I'm going to do this in the next version.
> > 
> > No, I do not think that is enough. At minimum, you'd need atomic_t
> > variable. But I'd recomend against it. Playing with locking is tricky.
> 
> Why do you think it is not enough?  I think that any locking is not
> needed.

You are wrong.

>   unsigned int mask = current->mm->coremask;

Not a valid C; coremask can change from another cpu.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux