On Fri, Mar 14, 2014 at 12:08 PM, Dave Jones <da...@redhat.com> wrote: > On Fri, Mar 14, 2014 at 11:31:11AM -0700, Kees Cook wrote: > > On Thu, Mar 13, 2014 at 4:12 PM, Dave Jones <da...@redhat.com> wrote: > > > On Thu, Mar 13, 2014 at 03:03:41PM -0700, Linus Torvalds wrote: > > > > > > > You need to look at the *symbol* number. In this output: > > > > > > > > [<ffffffff810020c2>] do_one_initcall+0xc2/0x1e0 > > > > > > > > that "ffffffff810020c2" is crap, and is going away. The address that > > > > is meaningful and valid is the "do_one_initcall+0xc2" part. > > > > > > > > *That* is the part you'd use to parse in user space. > > > > > > > > Try it today with the CONFIG_RANDOMIZE_BASE option to see. Using the > > > > hex number doesn't *work*. > > > > > > That reminds me, perf top is still busted when this option is enabled. > > > > Hrm, works for me. I'm not very familiar with what to expect, but > > comparing output between kaslr boot and nokaslr boot, it looks the > > same to me. > > ok, nokalsr makes it work too. > Booting with that and using the perf binary from 3.14rc6 , I just see.. > > 9.30% [kernel] [k] 0xffffffffaf18e887 > 7.98% [kernel] [k] 0xffffffffaf3276c7 > 6.10% [kernel] [k] 0xffffffffaf18dd3a > 4.39% [kernel] [k] 0xffffffffaf327717 > 1.71% [kernel] [k] 0xffffffffaf18e89c > 1.52% [kernel] [k] 0xffffffffaf3276cc > > Curiously, if I use the perf binary from 3.13, I see everything lumped > together as.. > > 95.89% [kernel].exit.text [k] 0x000000002e586c26 > > (When kaslr is disabled both binaries work fine) > > Also maybe related: The rc6 binary claims it can't read symbols from vmlinux > when kaslr is enabled.
Very odd. The perf I built from Linus's tree seems to resolve everything fine for me. I wonder what we're doing differently. I literally just did "cd tools/perf; make; scp perf root@test-machine:/root; ssh root@test-machine 'perf top'" and everything looks fine. -Kees -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
