On Mon, Jun 16, 2014 at 11:17:55PM -0400, Sasha Levin wrote: > On 06/13/2014 12:13 AM, Dave Jones wrote: > > On Fri, Jun 13, 2014 at 12:01:37AM -0400, Sasha Levin wrote: > > another theory: Trinity can sometimes generate plausible looking module > > addresses and pass those in structs etc. > > > > I wonder if there's somewhere in that path that isn't checking that the address > > in the optval it got is actually a userspace address before it tries to write to it. > > It happened again, and this time I've left the kernel addresses in, and it's quite > interesting: > > [ 88.837926] Call Trace: > [ 88.837926] [<ffffffff9ff6a792>] __sock_create+0x292/0x3c0 > [ 88.837926] [<ffffffff9ff6a610>] ? __sock_create+0x110/0x3c0 > [ 88.837926] [<ffffffff9ff6a920>] sock_create+0x30/0x40 > [ 88.837926] [<ffffffff9ff6ad4c>] SyS_socket+0x2c/0x70 > [ 88.837926] [<ffffffffa0561c30>] ? tracesys+0x7e/0xe6 > [ 88.837926] [<ffffffffa0561c93>] tracesys+0xe1/0xe6 > > tracesys() seems to live inside a module space here? I think it's more likely kASLR. The Documentation/x86/x86_64/mm.txt doc needs updating. -- Dan Aloni -- 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>