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Message-ID: <20150527220229.GF17625@uranus.sw.swsoft.com> Date: Thu, 28 May 2015 01:02:29 +0300 From: Cyrill Gorcunov <gorcunov@...il.com> To: Alexey Dobriyan <adobriyan@...il.com> Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, jarod@...hat.com, jstancek@...hat.com Subject: Re: [PATCH 1/2] prctl: more prctl(PR_SET_MM_*) checks On Thu, May 28, 2015 at 12:47:57AM +0300, Alexey Dobriyan wrote: > Individual prctl(PR_SET_MM_*) calls do some checking to maintain > consistent view of mm->arg_start et al fields, but not enough. > In particular PR_SET_MM_ARG_START/PR_SET_MM_ARG_END/PR_SET_MM_ENV_START/PR_SET_MM_ENV_END > only check that address lies in existent VMA, but doesn't check that > start address is lower that end address _at all_. > > Consolidate all consistency checks, so there will be no difference in > the future between PR_SET_MM_MAP and individual PR_SET_MM_* calls. > > The program below makes both ARGV and ENVP areas reverted, > makes /proc/$PID/cmdline show garbage (doesn't oops by luck). Why should it oops? Actually i would really love to drop off old PR_SET_MM_ interface completely (which requires CAP_SYS_RESOURCE), leaving only MM_MAP. But thank you! Acked-by: Cyrill Gorcunov <gorcunov@...nvz.org> -- 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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