* Cristian Rodríguez: > On Sat, Jul 23, 2022 at 12:25 PM Jason A. Donenfeld via Libc-alpha > <libc-alpha@xxxxxxxxxxxxxx> wrote: > >> For that reason, past discussion of having some random number generation >> in userspace libcs has geared toward doing this in the vDSO, somehow, >> where the kernel can be part and parcel of that effort. > > On linux just making this interface call "something" from the VDSO that > > - does not block. > - cannot ever fail or if it does indeed need to bail out it kills the > calling thread as last resort. > > (if neither of those can be provided, we are back to square one) > > Will be beyond awesome because it could be usable everywhere, > including the dynamic linker, malloc or whatever else > question is..is there any at least experimental patch with a hope of > beign accepted available ? I agree that this would be nice, but we'd like have to donate thread-specific data for kernel use, and that's currently totally vaporware. The “cannot ever fail” part is impossible to achieve due to old kernels and seccomp filters. Low-level userspace needs to paper over it in some way, so that applications don't have to deal with it. Thanks, Florian
