On Wed, 17 Jul 2013 14:09:20 +0800 merrys...@tom.com wrote: > I have meeted a problem with linux kernel 2.6.X.X that my user app > wants to get thread kernel stack frame ponter(FP) from user space by > system call or /proc system or any other ways except driver. I do not > want to write a driver,) to finish it. I have endured this problem > for a long time. > > would anyone please to give me a hint to solve the problem. >
(I'm ignoring the questionable practicality of this) People have gone to great lengths not to reveal sensitive addresses from ring 0, %rsp/%rbp being subject to this restriction. If you configure your kernel to expose full /dev/mem (CONFIG_STRICT_DEVMEM=n), then using the image for your running kernel and with a bit of DWARF knowledge, I _think_ it's possible to list the current running threads and their contexts (ie. CPU registers). Otherwise, I don't believe there's any way you can achieve this, other than exploiting a bug. :-) -- Mihai Donțu -- 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/
