On Fri, Oct 16, 2020 at 07:56:16AM +0100, Christoph Hellwig wrote: > On Thu, Oct 15, 2020 at 10:01:54AM -0500, Christopher M. Riedl wrote: > > Functions called between user_*_access_begin() and user_*_access_end() > > should be either inlined or marked 'notrace' to prevent leaving > > userspace access exposed. Mark any such functions relevant to signal > > handling so that subsequent patches can call them inside uaccess blocks. > > I don't think running this much code with uaccess enabled is a good > idea. Please refactor the code to reduce the criticial sections with > uaccess enabled. > > Btw, does powerpc already have the objtool validation that we don't > accidentally jump out of unsafe uaccess critical sections?
It does not, there was some effort on that a while ago, but I suspect they're waiting for the ARM64 effort to land and build on that.
