On Mon, Dec 4, 2017 at 9:14 AM, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > On Sun, Dec 03, 2017 at 12:16:08PM -0800, Eric Biggers wrote: >> Looks like BLKTRACESETUP doesn't limit the '.buf_nr' parameter, allowing anyone >> who can open a block device to cause an extremely large kmalloc. Here's a >> simplified reproducer: >> > > There are lots of places which allow people to allocate as much as they > want. With Syzcaller, you might want to just hard code a __GFP_NOWARN > in to disable it. Hi, Hard code it where? User-controllable allocation are supposed to use __GFP_NOWARN.
