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v2] powerpc: Hard wire PT_SOFTE value to 1 in gpr_get() too To: Oleg Nesterov , Benjamin Herrenschmidt , Madhavan Srinivasan , Michael Ellerman , Paul Mackerras References: <20190917121256.GA8659@redhat.com> <20190917143753.GA12300@redhat.com> <20200610150224.GA6793@redhat.com> From: Madhavan Srinivasan Message-ID: <321e6865-1762-c459-56c4-0cc89c7c2a7e@linux.ibm.com> Date: Thu, 11 Jun 2020 14:22:30 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200610150224.GA6793@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-11_07:2020-06-10, 2020-06-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=999 suspectscore=0 spamscore=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 malwarescore=0 phishscore=0 clxscore=1011 cotscore=-2147483648 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006110067 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, Jan Kratochvil , linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 6/10/20 8:37 PM, Oleg Nesterov wrote: > Hi, > > looks like this patch was forgotten. yep, I missed this. But mpe did have comments for the patch. https://lkml.org/lkml/2019/9/19/107 Maddy > > Do you think this should be fixed or should we document that > PTRACE_GETREGS is not consistent with PTRACE_PEEKUSER on ppc64? > > > On 09/17, Oleg Nesterov wrote: >> I don't have a ppc machine, this patch wasn't even compile tested, >> could you please review? >> >> The commit a8a4b03ab95f ("powerpc: Hard wire PT_SOFTE value to 1 in >> ptrace & signals") changed ptrace_get_reg(PT_SOFTE) to report 0x1, >> but PTRACE_GETREGS still copies pt_regs->softe as is. >> >> This is not consistent and this breaks >> http://sourceware.org/systemtap/wiki/utrace/tests/user-regs-peekpoke >> >> Reported-by: Jan Kratochvil >> Signed-off-by: Oleg Nesterov >> --- >> arch/powerpc/kernel/ptrace.c | 25 +++++++++++++++++++++++++ >> 1 file changed, 25 insertions(+) >> >> diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c >> index 8c92feb..291acfb 100644 >> --- a/arch/powerpc/kernel/ptrace.c >> +++ b/arch/powerpc/kernel/ptrace.c >> @@ -363,11 +363,36 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset, >> BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != >> offsetof(struct pt_regs, msr) + sizeof(long)); >> >> +#ifdef CONFIG_PPC64 >> + if (!ret) >> + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, >> + &target->thread.regs->orig_gpr3, >> + offsetof(struct pt_regs, orig_gpr3), >> + offsetof(struct pt_regs, softe)); >> + >> + if (!ret) { >> + unsigned long softe = 0x1; >> + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &softe, >> + offsetof(struct pt_regs, softe), >> + offsetof(struct pt_regs, softe) + >> + sizeof(softe)); >> + } >> + >> + BUILD_BUG_ON(offsetof(struct pt_regs, trap) != >> + offsetof(struct pt_regs, softe) + sizeof(long)); >> + >> + if (!ret) >> + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, >> + &target->thread.regs->trap, >> + offsetof(struct pt_regs, trap), >> + sizeof(struct user_pt_regs)); >> +#else >> if (!ret) >> ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, >> &target->thread.regs->orig_gpr3, >> offsetof(struct pt_regs, orig_gpr3), >> sizeof(struct user_pt_regs)); >> +#endif >> if (!ret) >> ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, >> sizeof(struct user_pt_regs), -1); >> -- >> 2.5.0 >>