linux-kernel - Re: [PATCH v2 perf/core] perf script: fix a use after free crash.

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Message-ID: <20161026002010.GD2525@templeofstupid.com>
Date:   Tue, 25 Oct 2016 17:20:10 -0700
From:   Krister Johansen <kjlx@...pleofstupid.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 perf/core] perf script: fix a use after free crash.

On Tue, Oct 11, 2016 at 02:28:39AM -0700, Krister Johansen wrote:
> If dso__load_kcore frees all of the existing maps, but one has already
> been attached to a callchain cursor node, then we can get a SIGSEGV in
> any function that happens to try to use this invalid cursor.  Use the
> existing map refcount mechanism to forestall cleanup of a map until the
> cursor iterates past the node.

It has been a couple of weeks since I sent out v2 of this patch.  I
understand that folks here have plenty of irons in the fire, but I
wanted to double-check that nobody was waiting on me for additional
information or changes.

Thanks,

-K