Hello, I'm auditing get_user_pages() users and when looking into vb2_dc_get_userptr() I was wondering about the following: The address this function works with is an arbitrary user-provided address. However the function vb2_dc_get_user_pages() uses pfn_to_page() on the pfn obtained from VM_IO | VM_PFNMAP vma. That isn't really safe for arbitrary vma of this type (such vmas don't have to have struct page associated at all). I expect this works because userspace always passes a pointer to either a regular vma or VM_FIXMAP vma where struct page is associated with pfn. Am I right? Or for on which vmas this code is supposed to work? Thanks in advance for clarification. Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
