From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC PATCH 0/4] arm64: vdso: check whether the params is invalid address
Date: Wed, 8 Jun 2016 10:33:20 +0100 [thread overview]
Message-ID: <20160608093319.GB27029@arm.com> (raw)
In-Reply-To: <5757E2E2.3010609@huawei.com>
On Wed, Jun 08, 2016 at 05:18:26PM +0800, Yang Yingliang wrote:
>
>
> On 2016/6/7 1:12, Will Deacon wrote:
> >On Wed, Jun 01, 2016 at 11:05:58AM +0800, Yang Yingliang wrote:
> >>The params of gettimeofday(), clock_gettime() and clock_getres()
> >>is not checked. This will cause segment faults when the address is
> >>invalid.
> >>E.g. gettimeofday(-1, -1);
> >> clock_gettime(0, -1);
> >> clock_getres(0, -1);
> >>This patchset add a macro and use it to check the validation of these
> >>pointer params.
> >
> >Is this really necessary? It doesn't look to me like other architectures
> >bother with this, and you're just adding code to the fastpath to handle
> >cases that shouldn't happen to start with.
> I agree.
>
> I find clock_gettime() don't check if tp is NULL. I think it need a
> checking like clock_getres().
>
> What's your suggestion ?
So what? If you pass NULL then you get a SEGV. Just like if you pass a
NULL pointer to various glibc wrappers.
Don't pass NULL. Problem solved.
Will
prev parent reply other threads:[~2016-06-08 9:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 3:05 [RFC PATCH 0/4] arm64: vdso: check whether the params is invalid address Yang Yingliang
2016-06-01 3:05 ` [RFC PATCH 1/4] arm64: vdso: introdce a macro for checking the address Yang Yingliang
2016-06-01 3:06 ` [RFC PATCH 2/4] arm64: vdso: check whether the params of gettimeofday() is valid Yang Yingliang
2016-06-01 3:06 ` [RFC PATCH 3/4] arm64: vdso: check whether the tp pointer is valid in clock_gettime() Yang Yingliang
2016-06-01 3:06 ` [RFC PATCH 4/4] arm64: vdso: check whether the res pointer is valid in clock_getres() Yang Yingliang
2016-06-06 17:12 ` [RFC PATCH 0/4] arm64: vdso: check whether the params is invalid address Will Deacon
2016-06-08 9:18 ` Yang Yingliang
2016-06-08 9:33 ` Will Deacon [this message]
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