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Message-Id: <20081110155410.be7552e3.akpm@linux-foundation.org> Date: Mon, 10 Nov 2008 15:54:10 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Ingo Molnar <mingo@...e.hu> Cc: adobriyan@...il.com, kenchen@...gle.com, linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl Subject: Re: [patch] add /proc/pid/stack to dump task's stack trace On Fri, 7 Nov 2008 10:29:02 +0100 Ingo Molnar <mingo@...e.hu> wrote: > > I guess the 0400 mode on that file will suffice... > > correct, 0400 is used already in the present patch: > > phoenix:~> cat /proc/1/stack > cat: /proc/1/stack: Permission denied > > but that is _not_ enough, it should be narrowed even more, to the > boundaries that i pointed out in my first review feedback mail, and > which is not implemented yet: > > 1) only root should be allowed to do this - i.e. file needs to be > root-owned. > > 2) there also needs to be a .config entry for folks to be able to > turn it off altogether - just like folks can turn off sysrq-t > dumping via the .config. Doing the above is desirable for another reason: given our rather erratic history with the stack backtracer, this /proc file is possibly a convenient way of oopsing the kernel, sending of off into la-la-land, etc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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