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From: Peter Maydell <peter.maydell@linaro.org>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
	Riku Voipio <riku.voipio@iki.fi>,
	Laurent Vivier <laurent@vivier.eu>,
	"patches@linaro.org" <patches@linaro.org>
Subject: Re: [Qemu-devel] [PATCH 1/4] linux-user/s390x: Mask si_addr for SIGSEGV
Date: Thu, 9 Nov 2017 11:12:02 +0000	[thread overview]
Message-ID: <CAFEAcA-jgiNjLeQUvkKT7+g0rLq2MiNmyuKNiM+gwQmVSe0U9g@mail.gmail.com> (raw)
In-Reply-To: <5d78560d-750c-929d-d3eb-e762a0b31b78@linaro.org>

On 8 November 2017 at 21:18, Richard Henderson
<richard.henderson@linaro.org> wrote:
> On 11/06/2017 07:33 PM, Peter Maydell wrote:
>> For s390x, the address passed to a signal handler in the
>> siginfo_t si_addr field is masked (in the kernel this is done in
>> do_sigbus() and do_sigsegv() in arch/s390/mm/fault.c). Implement
>> this architecture-specific oddity in linux-user.
>>
>> This is one of the issues described in
>> https://bugs.launchpad.net/qemu/+bug/1705118
>>
>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
>> ---
>>  linux-user/main.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> Accurate, but really seems like a s390x kernel bug.

The kernel code goes out of its way to do the masking, so if it's
a bug presumably it's a "retain back compat with some older
bug" thing...

thanks
-- PMM

  reply	other threads:[~2017-11-09 11:12 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-06 18:33 [Qemu-devel] [PATCH 0/4] linux-user: fix various SIGSEGV delivery bugs Peter Maydell
2017-11-06 18:33 ` [Qemu-devel] [PATCH 1/4] linux-user/s390x: Mask si_addr for SIGSEGV Peter Maydell
2017-11-07  8:06   ` Laurent Vivier
2017-11-07 15:34   ` Philippe Mathieu-Daudé
2017-11-08 21:18   ` Richard Henderson
2017-11-09 11:12     ` Peter Maydell [this message]
2017-11-06 18:33 ` [Qemu-devel] [PATCH 2/4] linux-user/ppc: Report correct fault address for data faults Peter Maydell
2017-11-07  8:17   ` Laurent Vivier
2017-11-08 21:19   ` Richard Henderson
2017-11-06 18:33 ` [Qemu-devel] [PATCH 3/4] linux-user/sparc: Put address for data faults where linux-user expects it Peter Maydell
2017-11-07  8:28   ` Laurent Vivier
2017-11-07  9:20     ` Peter Maydell
2017-11-07  9:25   ` Laurent Vivier
2017-11-07 15:26   ` Philippe Mathieu-Daudé
2017-11-08 21:21   ` Richard Henderson
2017-11-06 18:33 ` [Qemu-devel] [PATCH 4/4] linux-user: Handle rt_sigaction correctly for SPARC Peter Maydell
2017-11-07 14:11   ` Laurent Vivier
2017-11-07 15:44   ` Philippe Mathieu-Daudé
2017-11-07 20:02 ` [Qemu-devel] [PATCH 0/4] linux-user: fix various SIGSEGV delivery bugs Riku Voipio

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