Messages in this thread | | | From | Shaobo Huang <> | Subject | ping // [PATCH 4.4.y] arm: kprobes: Allow to handle reentered kprobe on single-stepping | Date | Thu, 8 Jul 2021 20:42:40 +0800 |
| |
ping
On Sat, Feb 27, 2021 at 05:17:01PM +0800, huangshaobo wrote: > From: Masami Hiramatsu <mhiramat@kernel.org> > > commit f3fbd7ec62dec1528fb8044034e2885f2b257941 upstream > > This is arm port of commit 6a5022a56ac3 ("kprobes/x86: Allow to > handle reentered kprobe on single-stepping") > > Since the FIQ handlers can interrupt in the single stepping > (or preparing the single stepping, do_debug etc.), we should > consider a kprobe is hit in the NMI handler. Even in that > case, the kprobe is allowed to be reentered as same as the > kprobes hit in kprobe handlers > (KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE). > > The real issue will happen when a kprobe hit while another > reentered kprobe is processing (KPROBE_REENTER), because > we already consumed a saved-area for the previous kprobe. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > Signed-off-by: Jon Medhurst <tixy@linaro.org> > Fixes: 24ba613c9d6c ("ARM kprobes: core code") > Cc: stable@vger.kernel.org #v2.6.25~v4.11 > Signed-off-by: huangshaobo <huangshaobo6@huawei.com> > --- > arch/arm/probes/kprobes/core.c | 6 ++++++ > 1 file changed, 6 insertions(+)
| |