From: Oleg Nesterov <oleg@redhat.com>
Date: Sun, 30 Sep 2012 19:12:44 +0000 (+0200)
Subject: uprobes: Fix the racy uprobe->flags manipulation
X-Git-Tag: v3.7-rc3~40^2~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71434f2fcba5c22d6e0d51878ba8e241a5dea5fb;p=pandora-kernel.git

uprobes: Fix the racy uprobe->flags manipulation

Multiple threads can manipulate uprobe->flags, this is obviously
unsafe. For example mmap can set UPROBE_COPY_INSN while register
tries to set UPROBE_RUN_HANDLER, the latter can also race with
can_skip_sstep() which clears UPROBE_SKIP_SSTEP.

Change this code to use bitops.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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