[Secure-testing-team] Bug#784278: powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

[Breno Leitao]

Source: linux
Version: 3.16.7-ckt9-3~deb8u1
Severity: critical
Tags: security patch
Justification: breaks the whole system

We should cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
(currently 127), otherwise we can be lost in a infinite loop when using a
ppc64el machine. :-(

I am attaching the fix that I tested adding it to the following directory, and
adding it to the debian/patch/series.
debian/patches/bugfix/ppc64el/powerpc-perf-Cap-64bits-userspace-backtraces.patch

Other than that, the patch submission could be seen at:
https://patchwork.ozlabs.org/patch/460955/

Thanks
Breno

-- System Information:
Debian Release: 8.0
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: ppc64el (ppc64le)

Kernel: Linux 3.16.0-4-powerpc64le (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
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