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SubjectRe: [PATCH 1/1] kernel/sysctl.c: Add cap_last_cap to /proc/sys/kernel
On Sat, 15 Oct 2011 07:50:05 -0700
Dan Ballard <> wrote:

> Userspace needs to know the highest valid capability of the running
> kernel, which right now cannot reliably be retrieved from the header
> files only. The fact that this value cannot be determined properly
> right now creates various problems for libraries compiled on newer
> header files which are run on older kernels. They assume
> capabilities are available which actually aren't.

Specfically, what libraries are we talking about here?

> Now the capability is exported in /proc/sys/kernel/cap_last_cap.

Ever the optimist: is there any way in which we can avoid 0444
permissions on this?

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