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On Wed, 2006-04-19 at 10:50 -0700, Tony Jones wrote: > This patch exports the namespace_sem semaphore. > > The shared subtree patches which went into 2.6.15-rc1 replaced the old > namespace semaphore which used to be per namespace (and visible) with a > new single static semaphore. > > The reason for this change is that currently visibility of vfsmount information > to the LSM hooks is fairly patchy. Either there is no passed parameter or > it can be NULL. For the case of the former, several LSM hooks that we > require to mediate have no vfsmount/nameidata passed. We previously (mis)used > the visibility of the old per namespace semaphore to walk the processes > namespace looking for vfsmounts with a root dentry matching the dentry we were > trying to mediate. > > Clearly this is not viable long term strategy and changes working towards > passing a vfsmount to all relevant LSM hooks would seem necessary (and also > useful for other users of LSM). Alternative suggestions and ideas are welcomed. The alternative I would recommend is to not use LSM. It isn't suitable for your path-based approach. If your path-based approach is deemed legitimate, then introduce new hooks at the proper point in processing where the information you need is available. -- Stephen Smalley National Security Agency - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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