Ingo Molnar <mi...@kernel.org> writes: > * Linus Torvalds <torva...@linux-foundation.org> wrote: > >> On Sat, Apr 28, 2018 at 2:18 AM Ingo Molnar <mi...@kernel.org> wrote: >> >> > I just tried the MPX testcases with the latest kernel: >> >> > deimos:~/tip/tools/testing/selftests/x86> ./mpx-mini-test_64 >> >> They need to be run as root. They try to access >> >> /sys/kernel/debug/tracing/set_ftrace_pid >> /sys/kernel/debug/tracing/trace >> >> and that's root-only. > > Indeed - but note that they are crashing as root as well here: > > root@deimos:/home/mingo/tip/tools/testing/selftests/x86# ./mpx-mini-test_64 > [...] > Aborted (core dumped) > > ... because I don't even have /sys/kernel/debug/tracing/set_ftrace_pid... :-/ > > That's despite having ftrace enabled. > > After some digging I found out that 'set_ftrace_pid' is dependent on > CONFIG_FUNCTION_TRACING=y (not just CONFIG_TRACING=y), which I didn't > have enabled on this kernel. > > After enabling it I got the 64-bit testcase to work: > > # > ... > ./mpx-mini-test_64 completed successfully > > But the 32-bit testcase is erroring out: > > root@deimos:/home/mingo/tip/tools/testing/selftests/x86# ./mpx-mini-test_32 > XSAVE is supported by HW & OS > XSAVE processor supported state mask: 0x21f > XSAVE OS supported state mask: 0x21f > BNDREGS: size: 64 user: 1 supervisor: 0 aligned: 0 > BNDCSR: size: 64 user: 1 supervisor: 0 aligned: 0 > executing unmaptest > mpx dig ( 1) complete, SUCCESS ( 0 / 0) > #BR status == 2, missing bounds table,kernel should have handled!! > > v4.17-rc2 based kernel, so it should have the latest MPX code.
If you remove this which tree will this be going into? I have some refactoring and cleanups of the x86 siginfo code I am hoping to get in later this development cycle and part of that was refactoring the mpx code so it works more like everything else. If the codes away I can just that part of the patchset. Eric
