On 01/12/2017 08:50 AM, Khalid Aziz wrote: > 2. Any shared page that has ADI protection enabled on it, must stay ADI > protected across all processes sharing it. Is that true? What happens if a page with ADI tags set is accessed via a PTE without the ADI enablement bit set? > COW creates an intersection of the two. It creates a new copy of the > shared data. It is a new data page and hence the process creating it > must be the one responsible for enabling ADI protection on it. Do you mean that the application must be responsible? Or the kernel running in the context of the new process must be responsible? > It is also a copy of what was ADI protected data, so should it > inherit the protection instead? I think the COW'd copy must inherit the VMA bit, the PTE bits, and the tags on the cachelines. > I misspoke earlier. I had misinterpreted the results of test I ran. > Changing the tag on shared memory is allowed by memory controller. The > requirement is every one sharing the page must switch to the new tag or > else they get SIGSEGV. I asked this in the last mail, but I guess I'll ask it again. Please answer this directly. If we require that everyone coordinate their tags on the backing physical memory, and we allow a lower-privileged program to access the same data as a more-privileged one, then the lower-privilege app can cause arbitrary crashes in the privileged application. For instance, say sudo mmap()'s /etc/passwd and uses ADI tags to protect the mapping. Couldn't any other app in the system prevent sudo from working? How can we *EVER* allow tags to be set on non-writable mappings? > I am inclined to suggest we copy the tags to the new data page on COW > and that will continue to enforce ADI on the COW'd pages even though > COW'd pages are new data pages. This is the logically consistent > behavior. Does that make sense? Yes, I think this is what you have to do. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
