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Guillaume Nault says: ==================== l2tp: session creation fixes The session creation process has a few issues wrt. concurrent tunnel deletion. Patch #1 avoids creating sessions in tunnels that are getting removed. This prevents races where sessions could try to take tunnel resources that were already released. Patch #2 removes some racy l2tp_tunnel_find() calls in session creation callbacks. Together with path #1 it ensures that sessions can only access tunnel resources that are guaranteed to remain valid during the session creation process. There are other problems with how sessions are created: pseudo-wire specific data are set after the session is added to the tunnel. So the session can be used, or deleted, before it has been completely initialised. Separating session allocation from session registration would be necessary, but we'd still have circular dependencies preventing race-free registration. I'll consider this issue in future series. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.