LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Christoph Hellwig <hch@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v2 3/5] signal: Add unsafe_copy_siginfo_to_user()
Date: Mon, 13 Sep 2021 14:59:00 +0200	[thread overview]
Message-ID: <a98f9e92-f304-9f69-c5b2-eed628846e4c@csgroup.eu> (raw)
In-Reply-To: <YTB1F7o15FrxmmP1@infradead.org>



Le 02/09/2021 à 08:54, Christoph Hellwig a écrit :
> On Mon, Aug 23, 2021 at 03:35:53PM +0000, Christophe Leroy wrote:
>> In the same spirit as commit fb05121fd6a2 ("signal: Add
>> unsafe_get_compat_sigset()"), implement an 'unsafe' version of
>> copy_siginfo_to_user() in order to use it within user access blocks.
>>
>> For that, also add an 'unsafe' version of clear_user().
> 
> I'm a little worried about all these unsafe helper in powerpc and the
> ever increasing scope of the unsafe sections.  Can you at least at
> powerpc support to objtool to verify them?  objtool verifications has
> helped to find quite a few bugs in unsafe sections on x86.

Ok, I've started looking at it, I have not found any work at all on 
objtool for powerpc. I'll see if I can draft something from the ARM64 
tentatives.

Christophe

  parent reply	other threads:[~2021-09-13 12:59 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 15:35 [PATCH v2 1/5] powerpc/signal64: Access function descriptor with user access block Christophe Leroy
2021-08-23 15:35 ` [PATCH v2 2/5] powerpc/signal: Include the new stack frame inside the " Christophe Leroy
2021-08-23 15:35 ` [PATCH v2 3/5] signal: Add unsafe_copy_siginfo_to_user() Christophe Leroy
2021-09-02  6:54   ` Christoph Hellwig
2021-09-02 16:05     ` Linus Torvalds
2021-09-13 12:59     ` Christophe Leroy [this message]
2021-09-02 18:43   ` Eric W. Biederman
2021-09-03  8:56     ` Christophe Leroy
2021-09-08 18:17       ` Eric W. Biederman
2021-09-10 10:27         ` Christophe Leroy
2021-09-11 15:58           ` Eric W. Biederman
2021-09-13 12:56             ` Christophe Leroy
2021-08-23 15:35 ` [PATCH v2 4/5] powerpc/uaccess: Add unsafe_clear_user() Christophe Leroy
2021-08-23 15:35 ` [PATCH v2 5/5] powerpc/signal: Use unsafe_copy_siginfo_to_user() Christophe Leroy
2021-09-02 18:38   ` Eric W. Biederman
2021-09-03  8:53     ` Christophe Leroy
2021-09-02  6:49 ` [PATCH v2 1/5] powerpc/signal64: Access function descriptor with user access block Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=a98f9e92-f304-9f69-c5b2-eed628846e4c@csgroup.eu \
    --to=christophe.leroy@csgroup.eu \
    --cc=benh@kernel.crashing.org \
    --cc=hch@infradead.org \
    --cc=jpoimboe@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=paulus@samba.org \
    --cc=peterz@infradead.org \
    --cc=torvalds@linux-foundation.org \
    --subject='Re: [PATCH v2 3/5] signal: Add unsafe_copy_siginfo_to_user()' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).