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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Joe Perches <joe@perches.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>,
	Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Dan Carpenter <error27@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Kees Cook <keescook@chromium.org>,
	zhanglin <zhang.lin16@zte.com.cn>
Subject: Re: [PATCH] kernel: sys.c: Avoid copying possible padding bytes in copy_to_user
Date: Mon, 28 Oct 2019 10:30:25 +0300	[thread overview]
Message-ID: <20191028073025.GB1944@kadam> (raw)
In-Reply-To: <92212e57d45f4410be654183f5dcb1e98d636ef2.camel@perches.com>

We should be able to use memzero_explicit(), right?

The fact that we memset() can't be used to prevent information leaks has
always worried me.  Everyone predicted that we would have bugs like this
where memset doesn't work as expected.

regards,
dan carpenter


  reply	other threads:[~2019-10-28  7:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-26 19:46 [PATCH] kernel: sys.c: Avoid copying possible padding bytes in copy_to_user Joe Perches
2019-10-27  5:47 ` Julia Lawall
2019-10-27 22:47   ` Joe Perches
2019-10-28  7:30     ` Dan Carpenter [this message]
2019-10-28 18:58     ` Kees Cook
2019-10-28  7:18 ` Dan Carpenter
2019-10-28  8:08   ` Joe Perches

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