Messages in this thread | | | Date | Wed, 3 Jun 2009 15:42:13 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space) |
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On Wed, 3 Jun 2009, Eric Paris wrote:
> NAK with SELinux on you now need both the SELinux mmap_zero > permission and the CAP_SYS_RAWIO permission. Previously you only > needed one or the other, depending on which was the predominant > LSM.....
CAP_SYS_RAWIO is checked so you only need to check for mmap_zero in SELinux.
> Even if you want to argue that I have to take CAP_SYS_RAWIO in the > SELinux case what about all the other places? do_mremap? do_brk? > expand_downwards?
brk(0) would free up all the code? The others could be added.
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