From: Tiejun Chen <tiejun.chen@windriver.com>
To: <benh@kernel.crashing.org>, <linuxppc-dev@ozlabs.org>
Subject: ppc32/kprobe: Fix a bug for kprobe stwu r1
Date: Mon, 12 Dec 2011 16:50:49 +0800 [thread overview]
Message-ID: <1323679853-31751-1-git-send-email-tiejun.chen@windriver.com> (raw)
ppc32/kprobe: Fix a bug for kprobe stwu r1
There patches is used to fix that known kprobe bug,
[BUG?]3.0-rc4+ftrace+kprobe: set kprobe at instruction 'stwu' lead to system crash/freeze
https://lkml.org/lkml/2011/7/3/156
We withdraw the original way to provide a dedicated exception stack. Now we
implement this based on Ben's suggestion:
https://lkml.org/lkml/2011/11/30/327
Here I fix this bug only for ppc32 since Ben address another problem in ppc64
exception return codes. So I think I'd better send another patch to fix this
bug issued from ppc64 firstly. Then its convenient to merge this fix into ppc64.
Tiejun Chen (4):
powerpc/kprobe: introduce a new thread flag
ppc32/kprobe: introduce copy_exc_stack
ppc32/kprobe: complete kprobe and migrate exception frame
ppc32/kprobe: don't emulate store when kprobe stwu r1
arch/powerpc/include/asm/page_32.h | 1 +
arch/powerpc/include/asm/thread_info.h | 2 ++
arch/powerpc/kernel/entry_32.S | 26 ++++++++++++++++++++++++++
arch/powerpc/kernel/misc_32.S | 16 +++++++++++++++-
arch/powerpc/kernel/ppc_ksyms.c | 1 +
arch/powerpc/lib/sstep.c | 19 +++++++++++++++++--
6 files changed, 62 insertions(+), 3 deletions(-)
Tiejun
next reply other threads:[~2011-12-12 8:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 8:50 Tiejun Chen [this message]
2011-12-12 8:50 ` [PATCH 1/4] powerpc/kprobe: introduce a new thread flag Tiejun Chen
2011-12-12 22:58 ` Benjamin Herrenschmidt
2011-12-13 4:56 ` tiejun.chen
2011-12-12 8:50 ` [PATCH 2/4] ppc32/kprobe: introduce copy_exc_stack Tiejun Chen
2011-12-12 23:01 ` Benjamin Herrenschmidt
2011-12-13 4:58 ` tiejun.chen
2011-12-12 8:50 ` [PATCH 3/4] ppc32/kprobe: complete kprobe and migrate exception frame Tiejun Chen
2011-12-12 23:19 ` Benjamin Herrenschmidt
2011-12-13 4:54 ` tiejun.chen
2011-12-13 8:21 ` tiejun.chen
2011-12-13 10:11 ` tiejun.chen
2011-12-13 10:36 ` tiejun.chen
2011-12-15 0:37 ` Benjamin Herrenschmidt
2011-12-15 11:19 ` tiejun.chen
2011-12-12 8:50 ` [PATCH 4/4] ppc32/kprobe: don't emulate store when kprobe stwu r1 Tiejun Chen
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