From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andy Lutomirski <luto@kernel.org>, Stas Sergeev <stsp@list.ru>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Borislav Petkov <bp@alien8.de>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context
Date: Wed, 14 Oct 2015 19:40:21 +0300 [thread overview]
Message-ID: <20151014164021.GS2048@uranus> (raw)
In-Reply-To: <6e14e2f7ce1c38fc1996bd4d5d3d9dc70b8bd94d.1444697927.git.luto@kernel.org>
On Mon, Oct 12, 2015 at 06:04:07PM -0700, Andy Lutomirski wrote:
...
>
> For the benefit of new 64-bit software that uses segmentation (new
> versions of DOSEMU might), the new behavior can be detected with a
> new ucontext flag UC_SIGCONTEXT_SS.
>
> To avoid compilation issues, __pad0 is left as an alias for ss in
> ucontext.
>
> The nitty-gritty details are documented in the header file.
>
> Cc: Stas Sergeev <stsp@list.ru>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Cyrill Gorcunov <gorcunov@gmail.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>
Andy, so for old criu versions (prior the 1.5.1 which is Mar 2015,
in next versions we already write proper ss into the images)
we've been providing __pad = 0, which is ss in a new meaning,
and the kernel will overwrite it with @user-ds after this series,
correct? This should work for us. Stas, mind to refresh my memory,
which ss value doesmu setups here?
next prev parent reply other threads:[~2015-10-14 16:40 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-13 1:04 [RFC 0/4] x86: sigcontext SS fixes, take 2 Andy Lutomirski
2015-10-13 1:04 ` [RFC 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Andy Lutomirski
2015-10-13 1:04 ` [RFC 2/4] x86/signal/64: Fix SS if needed when delivering a 64-bit signal Andy Lutomirski
2015-10-13 1:04 ` [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski
2015-10-13 14:59 ` Stas Sergeev
2015-10-14 15:01 ` Ingo Molnar
2015-10-14 15:09 ` Stas Sergeev
2015-10-14 16:40 ` Andy Lutomirski
2015-10-14 17:40 ` Stas Sergeev
2015-10-14 18:06 ` Andy Lutomirski
2015-10-14 18:34 ` Stas Sergeev
2015-10-14 18:52 ` Andy Lutomirski
2015-10-14 21:37 ` Stas Sergeev
2015-10-14 21:41 ` Andy Lutomirski
2015-10-18 13:36 ` Stas Sergeev
2015-10-18 16:12 ` Andy Lutomirski
2015-10-18 16:29 ` Stas Sergeev
2015-10-18 16:36 ` Andy Lutomirski
2015-10-18 16:43 ` Stas Sergeev
2015-10-18 17:06 ` Andy Lutomirski
2015-10-14 16:40 ` Cyrill Gorcunov [this message]
2015-10-14 16:42 ` Andy Lutomirski
2015-10-14 16:57 ` Cyrill Gorcunov
2015-10-14 16:57 ` Stas Sergeev
2015-10-14 17:01 ` Cyrill Gorcunov
2015-10-13 1:04 ` [RFC 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS Andy Lutomirski
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