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Subject: Re: uprobes: bug in comm/string output?
To:     Masami Hiramatsu <mhiramat@kernel.org>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
References: <bf358673-ceb2-65bf-80c9-4b1c09a8a264@fau.de>
 <8b67136d-28d7-a734-6366-9511e30d66a7@fau.de>
 <20190116190054.ac22c8495540578834446236@kernel.org>
 <62276858-9135-2393-8993-64e1088db7b9@fau.de>
 <20190117151309.711d41ebdd761b525a168837@kernel.org>
 <20190117170015.403157bf619907f8467189fe@kernel.org>
 <17147ef5-4348-9a02-d781-0f089fe603f5@fau.de>
 <20190117184717.9bbd1218b9f4fe6a8070a0fe@kernel.org>
From:   Andreas Ziegler <andreas.ziegler@fau.de>
Message-ID: <15ce335e-d40e-f9ef-e85a-507e153c55cb@fau.de>
Date:   Thu, 17 Jan 2019 14:44:41 +0100
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Hi,

On 1/17/19 10:47 AM, Masami Hiramatsu wrote:
> On Thu, 17 Jan 2019 09:08:41 +0100
> Andreas Ziegler <andreas.ziegler@fau.de> wrote:
>=20
>> On 17.01.19 09:00, Masami Hiramatsu wrote:
>>> On Thu, 17 Jan 2019 15:13:09 +0900
>>> Masami Hiramatsu <mhiramat@kernel.org> wrote:
>>>
>>>> On Wed, 16 Jan 2019 11:16:07 +0100
>>>> Andreas Ziegler <andreas.ziegler@fau.de> wrote:
>>>>
>>>>>
>>>>> I went into this a bit deeper today, and right now it is simply fai=
ling
>>>>> to parse the code because there is no FETCH_OP_COMM case in
>>>>> process_fetch_insn() for uprobes so that will return -EILSEQ, leadi=
ng to
>>>>> a make_data_loc(0, ...) in store_trace_args(). If we just add
>>>>> FETCH_OP_COMM and let val point to current->comm (that's what
>>>>> trace_kprobe.c does), we get an -EFAULT return value from
>>>>> fetch_store_string because strncpy_from_user() checks if the argume=
nt is
>>>>> in user space.
>>>>
>>>> Correct. I missed to add OP_COMM support. And uprobe's fetch_store_s=
tring
>>>> is only for user space strings.
>>>>
>>>>> So I think we might need a special case for that, something like
>>>>> FETCH_OP_ST_COMM_STRING which is only used for FETCH_OP_COMM and co=
pies
>>>>> current->comm over to the dynamic area. The implementation could be=

>>>>> similar to the old fetch_comm_string implementation before your rew=
rite.
>>>>
>>>> Hmm, instead, I would like to add current->comm checker and only all=
ows
>>>> to copy that. That would be simpler and enough.
>>>>
>>>> Could you test below patch?
>>>>
>>>>
>>>> tracing: uprobes: Re-enable $comm support for uprobe events
>>>>
>>>> From: Masami Hiramatsu <mhiramat@kernel.org>
>>>>
>>>> Since commit 533059281ee5 ("tracing: probeevent: Introduce new
>>>> argument fetching code") dropped the $comm support from uprobe
>>>> events, this re-enable it.
>>
>> this should read 're-enables'.
>>
>>>>
>>>> For $comm support, use strncpy() instead of strncpy_from_user()
>>                               ^
>> we're using strlcpy(), not strncpy().
>>
>>>> to copy current task's comm. Because it is in the kernel space,
>>>> strncpy_from_user() always fails to copy the comm.
>>>> This also use strlen() instead of strlen_user() to measure the
>>                 ^                        ^
>> 'uses', and the function should be 'strnlen_user()'.
>>
>>>> length of the comm.
>>>>
>>>> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
>>>> Reported-by: Andreas Ziegler <andreas.ziegler@fau.de>
>>>> ---
>>>>   kernel/trace/trace_uprobe.c |   13 +++++++++++--
>>>>   1 file changed, 11 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe=
=2Ec
>>>> index e335576b9411..97d134e83e0f 100644
>>>> --- a/kernel/trace/trace_uprobe.c
>>>> +++ b/kernel/trace/trace_uprobe.c
>>>> @@ -156,7 +156,10 @@ fetch_store_string(unsigned long addr, void *de=
st, void *base)
>>>>   	if (unlikely(!maxlen))
>>>>   		return -ENOMEM;
>>>>  =20
>>>> -	ret =3D strncpy_from_user(dst, src, maxlen);
>>>> +	if (addr =3D=3D (unsigned long)current->comm)
>>>> +		ret =3D strlcpy(dst, current->comm, maxlen);
>>>> +	else
>>>> +		ret =3D strncpy_from_user(dst, src, maxlen);
>>>>   	if (ret >=3D 0) {
>>>>   		if (ret =3D=3D maxlen)
>>>>   			dst[ret - 1] =3D '\0';
>>>> @@ -173,7 +176,10 @@ fetch_store_strlen(unsigned long addr)
>>>>   	int len;
>>>>   	void __user *vaddr =3D (void __force __user *) addr;
>>>>  =20
>>>> -	len =3D strnlen_user(vaddr, MAX_STRING_SIZE);
>>>> +	if (addr =3D=3D (unsigned long)current->comm)
>>>> +		len =3D strlen(current->comm);
>>>
>>> To balance with the strnlen_user, we must increse the len in this blo=
ck.
>>> (strlen doesn't count the final '\0', but strnlen_user counts it)
>>>
>>
>> yes, we need to add a '+ 1' here.
>>
>> With the typos and this one fixed, this is
>>
>> Acked-by: Andreas Ziegler <andreas.ziegler@fau.de>
>=20
> Thank you for fixing typo and Ack :)
>=20
> Thanks you,
 >
>>
>>> Thank you,
>>>
>>>> +	else
>>>> +		len =3D strnlen_user(vaddr, MAX_STRING_SIZE);
>>>>  =20
>>>>   	return (len > MAX_STRING_SIZE) ? 0 : len;
>>>>   }
>>>> @@ -213,6 +219,9 @@ process_fetch_insn(struct fetch_insn *code, stru=
ct pt_regs *regs, void *dest,
>>>>   	case FETCH_OP_IMM:
>>>>   		val =3D code->immediate;
>>>>   		break;
>>>> +	case FETCH_OP_COMM:
>>>> +		val =3D (unsigned long)current->comm;
>>>> +		break;
>>>>   	case FETCH_OP_FOFFS:
>>>>   		val =3D translate_user_vaddr(code->immediate);
>>>>   		break;
>>>
>>>
>>
>=20
>=20
as the original commit breaking $comm support was merged for v4.20=20
(which is a stable kernel) and the wrong behaviour with multiple strings =

exists in all longterm/stable releases (tested back to v4.4), do you=20
think this should be going into a stable release once it's merged?

I added Greg as he might know the answer to that.

Thanks,

Andreas


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