[hopefully fixed the 'mm' recipient] On Tue, 2018-06-26 at 09:54 -0700, Kees Cook wrote: > On Tue, Jun 26, 2018 at 2:48 AM, Paolo Abeni <pabeni@xxxxxxxxxx> wrote: > > With CONFIG_HARDENED_USERCOPY=y, perf shows ~6% of CPU time spent > > cumulatively in __check_object_size (~4%) and __virt_addr_valid (~2%). > > Are you able to see which network functions are making the > __check_object_size() calls? The call-chain is: __GI___libc_recvfrom entry_SYSCALL_64_after_hwframe do_syscall_64 __x64_sys_recvfrom __sys_recvfrom inet_recvmsg udp_recvmsg __check_object_size udp_recvmsg() actually calls copy_to_iter() (inlined) and the latters calls check_copy_size() (again, inlined). Cheers, Paolo
