On Tue, Nov 28, 2017 at 8:48 AM, <js1304@xxxxxxxxx> wrote: > From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > > Hello, > > This patchset introduces a new tool, valid access checker. > > Vchecker is a dynamic memory error detector. It provides a new debug feature > that can find out an un-intended access to valid area. Valid area here means > the memory which is allocated and allowed to be accessed by memory owner and > un-intended access means the read/write that is initiated by non-owner. > Usual problem of this class is memory overwritten. > > Most of debug feature focused on finding out un-intended access to > in-valid area, for example, out-of-bound access and use-after-free, and, > there are many good tools for it. But, as far as I know, there is no good tool > to find out un-intended access to valid area. This kind of problem is really > hard to solve so this tool would be very useful. > > This tool doesn't automatically catch a problem. Manual runtime configuration > to specify the target object is required. > > Note that there was a similar attempt for the debugging overwritten problem > however it requires manual code modifying and recompile. > > http://lkml.kernel.org/r/<20171117223043.7277-1-wen.gang.wang@xxxxxxxxxx> > > To get more information about vchecker, please see a documention at > the last patch. > > Patchset can also be available at > > https://github.com/JoonsooKim/linux/tree/vchecker-master-v1.0-next-20171122 > > Enjoy it. Hi Joonsoo, I skimmed through the code and this looks fine from KASAN point of view (minimal code changes and no perf impact). I don't feel like I can judge if this should go in or not. I will not use this, we use KASAN for large-scale testing, but vchecker is in a different bucket, it is meant for developers debugging hard bugs. Wengang come up with a very similar change, and Andi said that this looks useful. If the decision is that this goes in, please let me take a closer look before this is merged. Thanks -- 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>
