On Wed, Jun 27, 2018 at 5:05 PM, Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: > On Tue, Jun 26, 2018 at 7:29 PM, Catalin Marinas > <catalin.marinas@xxxxxxx> wrote: >> While I support this work, as a maintainer I'd like to understand >> whether we'd be in a continuous chase of ABI breaks with every kernel >> release or we have a better way to identify potential issues. Is there >> any way to statically analyse conversions from __user ptr to long for >> example? Or, could we get the compiler to do this for us? > > > OK, got it, I'll try to figure out a way to find these conversions. I've prototyped a checker on top of clang static analyzer (initially looked at sparse, but couldn't find any documentation or examples). The results are here [1], search for "warning: user pointer cast". Sharing in case anybody wants to take a look, will look at them myself tomorrow. [1] https://gist.github.com/xairy/433edd5c86456a64026247cb2fef2115
