All of lore.kernel.org
 help / color / mirror / Atom feed
From: Miroslav Benes <mbenes@suse.cz>
To: Jessica Yu <jeyu@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Petr Mladek <pmladek@suse.com>, Jiri Kosina <jikos@kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-api@vger.kernel.org, live-patching@vger.kernel.org,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	linux-s390@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v5 1/6] Elf: add livepatch-specific Elf constants
Date: Mon, 21 Mar 2016 14:47:01 +0100 (CET)	[thread overview]
Message-ID: <alpine.LNX.2.00.1603211445500.12175@pobox.suse.cz> (raw)
In-Reply-To: <1458157628-8264-2-git-send-email-jeyu@redhat.com>

On Wed, 16 Mar 2016, Jessica Yu wrote:

> Livepatch manages its own relocation sections and symbols in order to be
> able to reuse module loader code to write relocations. This removes
> livepatch's dependence on separate "dynrela" sections to write relocations
> and also allows livepatch to patch modules that are not yet loaded.
> 
> The livepatch Elf relocation section flag (SHF_RELA_LIVEPATCH),
> and symbol section index (SHN_LIVEPATCH) allow both livepatch and the
> module loader to identity livepatch relocation sections and livepatch
> symbols.
> 
> Livepatch relocation sections are marked with SHF_RELA_LIVEPATCH to
> indicate to the module loader that it should not apply that relocation
> section and that livepatch will handle them.
> 
> The SHN_LIVEPATCH shndx marks symbols that will be resolved by livepatch.
> The module loader ignores these symbols and does not attempt to resolve
> them.
> 
> The values of these Elf constants were selected from OS-specific
> ranges according to the definitions from glibc.
> 
> Signed-off-by: Jessica Yu <jeyu@redhat.com>

Reviewed-by: Miroslav Benes <mbenes@suse.cz>

WARNING: multiple messages have this Message-ID (diff)
From: Miroslav Benes <mbenes-AlSwsSmVLrQ@public.gmane.org>
To: Jessica Yu <jeyu-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>,
	Josh Poimboeuf <jpoimboe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Petr Mladek <pmladek-IBi9RG/b67k@public.gmane.org>,
	Jiri Kosina <jikos-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	live-patching-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v5 1/6] Elf: add livepatch-specific Elf constants
Date: Mon, 21 Mar 2016 14:47:01 +0100 (CET)	[thread overview]
Message-ID: <alpine.LNX.2.00.1603211445500.12175@pobox.suse.cz> (raw)
In-Reply-To: <1458157628-8264-2-git-send-email-jeyu-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Wed, 16 Mar 2016, Jessica Yu wrote:

> Livepatch manages its own relocation sections and symbols in order to be
> able to reuse module loader code to write relocations. This removes
> livepatch's dependence on separate "dynrela" sections to write relocations
> and also allows livepatch to patch modules that are not yet loaded.
> 
> The livepatch Elf relocation section flag (SHF_RELA_LIVEPATCH),
> and symbol section index (SHN_LIVEPATCH) allow both livepatch and the
> module loader to identity livepatch relocation sections and livepatch
> symbols.
> 
> Livepatch relocation sections are marked with SHF_RELA_LIVEPATCH to
> indicate to the module loader that it should not apply that relocation
> section and that livepatch will handle them.
> 
> The SHN_LIVEPATCH shndx marks symbols that will be resolved by livepatch.
> The module loader ignores these symbols and does not attempt to resolve
> them.
> 
> The values of these Elf constants were selected from OS-specific
> ranges according to the definitions from glibc.
> 
> Signed-off-by: Jessica Yu <jeyu-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Reviewed-by: Miroslav Benes <mbenes-AlSwsSmVLrQ@public.gmane.org>

  reply	other threads:[~2016-03-21 13:47 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-16 19:47 [PATCH v5 0/6] (mostly) Arch-independent livepatch Jessica Yu
2016-03-16 19:47 ` [PATCH v5 1/6] Elf: add livepatch-specific Elf constants Jessica Yu
2016-03-21 13:47   ` Miroslav Benes [this message]
2016-03-21 13:47     ` Miroslav Benes
2016-03-16 19:47 ` [PATCH v5 2/6] module: preserve Elf information for livepatch modules Jessica Yu
2016-03-16 20:05   ` kbuild test robot
2016-03-16 20:05     ` kbuild test robot
2016-03-16 20:28   ` kbuild test robot
2016-03-16 20:28     ` kbuild test robot
2016-03-16 21:25   ` Jessica Yu
2016-03-16 21:25     ` Jessica Yu
2016-03-16 21:31   ` [PATCH v5 2/6] " kbuild test robot
2016-03-16 21:31     ` kbuild test robot
2016-03-21 13:48   ` Miroslav Benes
2016-03-21 14:06   ` Josh Poimboeuf
2016-03-21 14:06     ` Josh Poimboeuf
2016-03-22 17:57     ` Jessica Yu
2016-03-22 17:57       ` Jessica Yu
2016-03-22 18:55       ` Josh Poimboeuf
2016-03-22 18:55         ` Josh Poimboeuf
2016-03-21 16:50   ` [PATCH v5 2/6] " Petr Mladek
2016-03-21 16:50     ` Petr Mladek
2016-03-16 19:47 ` [PATCH v5 3/6] module: s390: keep mod_arch_specific " Jessica Yu
2016-03-21 13:49   ` Miroslav Benes
2016-03-16 19:47 ` [PATCH v5 4/6] livepatch: reuse module loader code to write relocations Jessica Yu
2016-03-21 13:55   ` Miroslav Benes
2016-03-21 19:18     ` Jessica Yu
2016-03-21 19:24       ` Josh Poimboeuf
2016-03-21 21:16       ` Jiri Kosina
2016-03-21 21:34         ` Josh Poimboeuf
2016-03-21 22:02           ` Jiri Kosina
2016-03-21 22:02             ` Jiri Kosina
2016-03-22 19:00             ` Jessica Yu
2016-03-21 15:10   ` [PATCH v5 4/6] " Josh Poimboeuf
2016-03-21 15:10     ` Josh Poimboeuf
2016-03-21 16:31   ` Petr Mladek
2016-03-21 16:46     ` Josh Poimboeuf
2016-03-21 16:46       ` Josh Poimboeuf
2016-03-21 17:36       ` Josh Poimboeuf
2016-03-21 17:36         ` Josh Poimboeuf
2016-03-21 18:07         ` Jessica Yu
2016-03-16 19:47 ` [PATCH v5 5/6] samples: livepatch: mark as livepatch module Jessica Yu
2016-03-21 13:56   ` Miroslav Benes
2016-03-21 13:56     ` Miroslav Benes
2016-03-21 15:54   ` Josh Poimboeuf
2016-03-16 19:47 ` [PATCH v5 6/6] Documentation: livepatch: outline Elf format and requirements for patch modules Jessica Yu
2016-03-21 13:56   ` Miroslav Benes

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=alpine.LNX.2.00.1603211445500.12175@pobox.suse.cz \
    --to=mbenes@suse.cz \
    --cc=corbet@lwn.net \
    --cc=jeyu@redhat.com \
    --cc=jikos@kernel.org \
    --cc=jpoimboe@redhat.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=live-patching@vger.kernel.org \
    --cc=pmladek@suse.com \
    --cc=rusty@rustcorp.com.au \
    --cc=x86@kernel.org \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.