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Date: Mon, 27 Jun 2016 10:09:32 +0800 From: zhouchengming <zhouchengming1@...wei.com> To: Bamvor Zhang <bamv2005@...il.com> CC: Yury Norov <ynorov@...iumnetworks.com>, Arnd Bergmann <arnd@...db.de>, Catalin Marinas <catalin.marinas@....com>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>, <linux-arch@...r.kernel.org>, <linux-s390@...r.kernel.org>, <libc-alpha@...rceware.org>, <kilobyte@...band.pl>, <pinskia@...il.com>, <szabolcs.nagy@....com>, <Nathan_Lynch@...tor.com>, <heiko.carstens@...ibm.com>, Alexander Graf <agraf@...e.de>, <geert@...ux-m68k.org>, <Prasun.Kapoor@...iumnetworks.com>, <klimov.linux@...il.com>, <broonie@...nel.org>, <schwidefsky@...ibm.com>, Bamvor Jian Zhang <bamvor.zhangjian@...wei.com>, <philipp.tomsich@...obroma-systems.com>, <joseph@...esourcery.com>, <christoph.muellner@...obroma-systems.com>, <guohanjun@...wei.com> Subject: Re: [PATCH 17/23] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 On 2016/6/25 22:15, Bamvor Zhang wrote: > Hi, Chengming > > On Sat, Jun 25, 2016 at 5:36 PM, zhouchengming > <zhouchengming1@...wei.com> wrote: >> On 2016/6/9 1:00, Yury Norov wrote: >>> >>> On Wed, Jun 08, 2016 at 09:34:09AM +0800, zhouchengming wrote: >>>> >>>> On 2016/5/24 8:04, Yury Norov wrote: >>>>> >>>>> Here new aarch32 ptrace syscall handler is introsuced to avoid run-time >>>>> detection of the task type. >>>>> >>>>> Signed-off-by: Yury Norov<ynorov@...iumnetworks.com> >>> >>> >>> [...] >>> >>>> Hello, I found ilp32 will use sys_ptrace, not compat_sys_ptrace. So I >>>> write >>>> a little patch to see if can solve the problem correctly. >>>> >>>> Thanks. >>>> >>>> From f6156236df578bb05c4a17e7f9776ceaf8f7afe6 Mon Sep 17 00:00:00 2001 >>>> From: Zhou Chengming<zhouchengming1@...wei.com> >>>> Date: Wed, 8 Jun 2016 09:46:23 +0800 >>>> Subject: [PATCH] ilp32: use compat_sys_ptrace instead of sys_ptrace >>>> >>>> When we analyze a testcase of ptrace that failed on ilp32, we found >>>> the syscall that the ilp32 uses is sys_ptrace, not compat_sys_ptrace. >>>> Because in include/uapi/asm-generic/unistd.h it's defined like: >>>> __SYSCALL(__NR_ptrace, sys_ptrace) >>>> So we change it to __SC_COMP(__NR_ptrace, sys_ptrace, compat_sys_ptrace), >>>> let compat tasks use the compat_sys_ptrace. >>>> >>>> Signed-off-by: Zhou Chengming<zhouchengming1@...wei.com> >>>> --- >>>> include/uapi/asm-generic/unistd.h | 2 +- >>>> 1 files changed, 1 insertions(+), 1 deletions(-) >>>> >>>> diff --git a/include/uapi/asm-generic/unistd.h >>>> b/include/uapi/asm-generic/unistd.h >>>> index 2862d2e..50ee770 100644 >>>> --- a/include/uapi/asm-generic/unistd.h >>>> +++ b/include/uapi/asm-generic/unistd.h >>>> @@ -364,7 +364,7 @@ __SC_WRAP(__NR_syslog, sys_syslog) >>>> >>>> /* kernel/ptrace.c */ >>>> #define __NR_ptrace 117 >>>> -__SYSCALL(__NR_ptrace, sys_ptrace) >>>> +__SC_COMP(__NR_ptrace, sys_ptrace, compat_sys_ptrace) >>>> >>>> /* kernel/sched/core.c */ >>>> #define __NR_sched_setparam 118 >>>> -- >>>> 1.7.7 >>>> >>> >>> Hi Zhou, >>> >>> Thank you for the catch. >>> >>> Could you also show the test that is failed for you. It should >>> probably be sent to LTP maillist. >>> >>> I'm not sure your fix correct as it affects other architectures that >>> use standard unistd.h. I think it's better to redirect the syscall in >>> arch/arm64/kernel/sys_ilp32.c with corresponding definition. >>> >>> Yury >>> >>> . >>> >> >> Sorry, I missed this mail. Thanks for your reply. :) >> I attach the testcase file of ptrace that failed on ilp32. >> I also think it's better to redirect the syscall in ilp32, so I changed >> the patch. > > Thanks for your patch. But Yury has already sent an new series this week > which define ptrace to compat one. > > It seems that Yury do not take GET/SETSIGMASK into account. You > could share your test case and patches at this point. > > Best wishes > > Bamvor Ok, I get it. So the new series can handle ptrace correctly. :) But as for the GET/SETSIGMASK request, both ilp32 and aarch32 are wrong, because they are handled in ptrace_request(like aarch64). But I don't have a good way to correct it in all architectures. The architectures that use compat_ptrace_request are: arch/arm64, arch/mips, arch/parisc, arch/powerpc, arch/s390, arch/sparc, arch/tile, arch/x86. We have to use two architecture dependent functions in compat_ptrace_request to fix the GET/SETSIGMASK request. (as for arch/arm64, the two functions are: put_sigset_t and get_sigset_t) So we maybe have to prepare these functions for all these architectures. But I don't have much time to work on it. So I just fix it for ilp32 of arch/arm64 (Ah, easier way for me). I will put my patch of this fix under Yury's new series. Thanks! > > [1] https://www.mail-archive.com/linux-doc@vger.kernel.org/msg03811.html >> >> >> From 7e692ba1adf02c2a2f125836f5222f455c9ffe56 Mon Sep 17 00:00:00 2001 >> From: Zhou Chengming<zhouchengming1@...wei.com> >> Date: Sat, 25 Jun 2016 18:02:51 +0800 >> Subject: [PATCH] ilp32 should use compat_sys_ptrace >> >> The file include/uapi/asm-generic/unistd.h defines this: >> __SYSCALL(__NR_ptrace, sys_ptrace) >> It may cause some ptrace tests failed on ilp32. So we redirect the ptrace >> syscall in arch/arm64/kernel/sys_ilp32.c with corresponding definition. >> >> Signed-off-by: Zhou Chengming<zhouchengming1@...wei.com> >> --- >> arch/arm64/kernel/sys_ilp32.c | 3 +++ >> 1 files changed, 3 insertions(+), 0 deletions(-) >> >> diff --git a/arch/arm64/kernel/sys_ilp32.c b/arch/arm64/kernel/sys_ilp32.c >> index d85fe94..06d5e1b 100644 >> --- a/arch/arm64/kernel/sys_ilp32.c >> +++ b/arch/arm64/kernel/sys_ilp32.c >> @@ -46,6 +46,9 @@ >> asmlinkage long ilp32_sys_rt_sigreturn_wrapper(void); >> #define compat_sys_rt_sigreturn ilp32_sys_rt_sigreturn_wrapper >> >> +/* ilp32 should use compat_sys_ptrace */ >> +#define sys_ptrace compat_sys_ptrace >> + >> #include<asm/syscall.h> >> >> #undef __SYSCALL >> -- >> 1.7.7 >> >> >> > > >
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