On 10/03/2015 01:17 AM, Ingo Molnar wrote: > Right now the native x86 PTE format allows two protection related bits for > user-space pages: > > _PAGE_BIT_RW: if 0 the page is read-only, if 1 then it's read-write > _PAGE_BIT_NX: if 0 the page is executable, if 1 then it's not executable > > As discussed previously, pkeys allows 'true execute only (--x)' mappings. > > Another possibility would be 'true write-only (-w-)' mappings. How would those work? Protection Keys has a Write-Disable and an Access-Disable bit. But, Access-Disable denies _all_ data access to the region. There's no way to allow only writes. Or am I missing something? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>