Messages in this thread |  | | | Subject | Re: [RFC] FUSE permission modell (Was: fuse review bits) | | From | Miklos Szeredi <> | | Date | Wed, 20 Apr 2005 09:09:38 +0200 |
> Likely because its a chroot vulnerability. > > It allows a process to obtain a reference to the root vfsmount that > doesn't have chroot checks performed on it. > > Consider the following pseudo example: > [...] > > if main is run within a chroot where it's "/" is on the same vfsmount as > it's "..", then the application can step out of the chroot using clone(2). > > Note: using chdir in a vfsmount outside of your namespace works, however > you won't be able to walk off that vfsmount (to its parent or children).
How about fixing fchdir, so it checks whether you gone outside the tree under current->fs->rootmnt? Should be fairly easy to do.
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