Re: Local DoS on single_open?

viro_at_parcelfarce.linux.theplanet.co.uk
Date: 09/11/03

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    Date:	Thu, 11 Sep 2003 05:55:07 +0100
To: Keith Owens <kaos@ocs.com.au>

    On Thu, Sep 11, 2003 at 02:42:13PM +1000, Keith Owens wrote:
    > single_open() requires the kernel to kmalloc a buffer which lives until
    > the userspace caller closes the file. What prevents a malicious user
    > opening the same /proc entry multiple times, allocating lots of kmalloc
    > space and causing a local DoS?

    Size of that buffer is limited. IOW, it's not different from opening
    e.g. a shitload of pipes or sockets.
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