Excerpts from Michael Ellerman's message of 2016-03-25 05:01:38 -0500: > I think you can (should) use is_kernel_addr() for the DAR check. > > I'm also slightly worried by that logic in the case of a non-kernel context. > > ie. if ctx->kernel is false, we get: > > if (true || !is_kernel_addr(dar)) > access |= _PAGE_USER; > > Which means we just add _PAGE_USER for any address. What am I missing here?
It's been ages since I did a deep dive on the related mm code, so I don't recall the precise details so take this with a grain of salt, but if memory serves the call to copro_handle_mm_fault will fail if a user is trying to access a kernel region since it won't be mapped in the mm. -Ian _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
