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[Bug 1442180] [NEW] powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

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From: Launchpad Bug Tracker <1442180@xxxxxxxxxxxxxxxxxx>
Date: Thu, 09 Apr 2015 14:24:19 -0000
Reply-to: Bug 1442180 <1442180@xxxxxxxxxxxxxxxxxx>
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You have been subscribed to a public bug:

Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
(currently 127), but we forgot to do the same for 64bit backtraces.

If userspace creates a stack frame that points to itself we will
loop forever in the backtrace code with interrupts off.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: Confirmed


** Tags: architecture-ppc64le bugnameltc-123761 severity-critical targetmilestone-inin1504
-- 
powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
https://bugs.launchpad.net/bugs/1442180
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