On 19-09-2020 17:03, Anant Thazhemadam wrote: > On 19-09-2020 22:25, Al Viro wrote: >> On Sat, Sep 19, 2020 at 05:17:27PM +0100, Al Viro wrote: >> >>> Lovely... That would get an empty path and non-directory for a starting >>> point, but it should end up with LAST_ROOT in nd->last_type. Which should >>> not be able to reach the readers of those fields... Which kernel had >>> that been on? >> Yecchhh... I see what's going on; I suspect that this ought to be enough. >> Folks, could somebody test it on the original reproducer setup? > Sure. I can do that. Looks like this patch actually fixes this bug. I made syzbot test the patch, and no issues were triggered! Note: syzbot tested the patch with the KMSAN kernel, which was recently rebased on v5.9-rc4. Thanks, Anant
