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From: Al Viro <viro@zeniv.linux.org.uk>
To: Alexander Potapenko <glider@google.com>
Cc: Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	sunhaoyl@outlook.com, x86@kernel.org
Subject: Re: [PATCH] fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info()
Date: Mon, 25 May 2020 00:45:35 +0100
Message-ID: <20200524234535.GA23230@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200513033349.GR23230@ZenIV.linux.org.uk>

On Wed, May 13, 2020 at 04:33:49AM +0100, Al Viro wrote:

> FWIW, what I'm going to do is
> 	* make all callers of copy_regset_to_user() pass 0 as pos
> (there are very few exceptions - one on arm64, three on sparc32
> and five on sparc64; I hadn't dealt with arm64 one yet, but all
> cases on sparc are handled)

[snip]

Any of that would be easy to backport, though.  Several questions
regaring XSAVE and friends:

* do we ever run on XSAVE/XSAVES-capable hardware with XFEATURE_FP
turned off?

* is it possible for x86 to have gaps between the state components
area as reported by CPUID 0x0d?  IOW, can area for feature 2
(XFEATURE_YMM) to start *not* at 0x200 and can area for N start
not right after the end of area for N-1 for some N > 2?

I think I have an easy-to-backport solution, but I'm really confused
about XFEATURE_FP situation...

  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-19 10:08 glider
2020-04-19 10:10 ` Alexander Potapenko
2020-04-20 22:33 ` Andrew Morton
2020-04-20 22:41   ` Kees Cook
2020-04-21  3:42     ` Al Viro
2020-04-21  8:14       ` Alexander Potapenko
2020-05-12  1:09         ` Al Viro
2020-05-12  3:44           ` Al Viro
2020-05-12  8:20             ` Alexander Potapenko
2020-05-13  3:33               ` Al Viro
2020-05-24 23:45                 ` Al Viro [this message]
2020-05-26 22:38                   ` Al Viro
2020-05-27 12:08                     ` Alexander Potapenko
2020-05-27 19:04                     ` Borislav Petkov
2020-05-27 19:53                       ` Al Viro
2020-05-27 20:09                         ` Borislav Petkov
2020-04-21 12:54       ` Alexander Potapenko
2020-04-21 15:09         ` Jann Horn
2020-04-21 16:04           ` Yu-cheng Yu
2020-04-21 16:16             ` Jann Horn
2020-04-21 16:26               ` Yu-cheng Yu
2020-04-21 20:20               ` Kees Cook
2020-04-21  8:06     ` Alexander Potapenko
2020-05-27 21:55     ` Kees Cook
2020-04-21  8:00   ` Alexander Potapenko

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