Messages in this thread | | | Date | Fri, 17 Sep 2004 15:24:40 +0200 | From | Utz Lehmann <> | Subject | Re: [PATCH] flexmmap: optimise mmap_base gap for hard limited stack |
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Andrea Arcangeli [andrea@novell.com] wrote: > I developed a sysctl several years ago in all my 2.2 and 2.4 kernels > including all 2.2 and 2.4 SUSE kernels that major software vendors > requires for safety of their apps. IIRC I tried to merge it once but I > failed (got not applied to mainline). Now I'v just got another bugzilla > open about the lack of the sysctl and the major app is now again not > foolproof. A fixed number won't work, so I have to drop such a fixed GAP > anyways and rewrite it by forward porting my patch. > > The sysctl in question is /proc/sys/vm/heap-stack-gap, so I recommend to > drop all those fixed GAP sizes and implement this instead: > > http://www.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa3/00_silent-stack-overflow-20 > > If you reinvet the wheel and you prefer not to share the above code to > make a sysctl, at least make sure to use the name "heap-stack-gap" to > avoid any pointless incompatibility.
I dont know if i understand your patch correctly. It looks that there is a gap wandering below the actual stack. If this is the case than i think it's not suited for the flexmmap layout. With flexmmap the mappings are top down from mmap_base. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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