linux-kernel - [for-linus][PATCH 0/3] tracing/ftrace: trace_printk buffer fix and ftrace recursion fixes

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Date:   Sat, 31 Oct 2020 09:06:42 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, Petr Mladek <pmladek@...e.com>
Subject: [for-linus][PATCH 0/3] tracing/ftrace: trace_printk buffer fix and ftrace recursion fixes

The indexing of the different context buffers had an off by one error.

The recursion protection for ftrace callbacks had two bugs.
 One that would make NMIs always appear to be recursing
 The other is trasitions between interrupt context could also cause
 false positives and miss tracing those functions.

Qiujun Huang (1):
      tracing: Fix out of bounds write in get_trace_buf

Steven Rostedt (VMware) (2):
      ftrace: Fix recursion check for NMI test
      ftrace: Handle tracing when switching between context

----
 kernel/trace/trace.c          |  2 +-
 kernel/trace/trace.h          | 26 +++++++++++++++++++++++---
 kernel/trace/trace_selftest.c |  9 +++++++--
 3 files changed, 31 insertions(+), 6 deletions(-)