Re: [patch] i386, vdso=[0|1] boot option and /proc/sys/vm/vdso_enabled

From: Ingo Molnar
Date: Sun May 21 2006 - 06:45:36 EST

* Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:

> But it turns out that this is a known problem with FC1's glibc and the
> exec-shield patches (google for FC1 glibc vdso). [..]

no, i think that conclusion is wrong. The FC1 glibc and vdso problems
*when mixing a FC2 kernel with a FC1 glibc* were due to exec-shield
enforcing non-exec for the vdso.

> [...] When Ingo and Arjan convinced me to push their code from
> exec-shield, they conveniently didn't mention this.

this bug has nothing to do with nonexec restrictions. [ Also, this all
was _years_ and hundreds of bugs ago, when upstream's position was still
a cocky "who the hell needs protection against overflows" and "go away
with this non-exec crap" so we were pretty much alone trying to
introduce those features. So any suggestion of intention on our part
would be quite unfair. ]

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