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Re: [Qemu-devel] [PATCH 1/1] Fix do_rt_sigreturn on m68k linux userspace
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From: |
Laurent Vivier |
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Subject: |
Re: [Qemu-devel] [PATCH 1/1] Fix do_rt_sigreturn on m68k linux userspace emulation |
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Date: |
Sat, 12 Dec 2015 11:35:05 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
Le 12/12/2015 10:55, Michael Karcher a écrit :
> On 09.12.2015 23:03, Laurent Vivier wrote:
>>
>> Le 09/12/2015 21:54, Michael Karcher a écrit :
>>> do_rt_sigreturn forgets to initialize the signal mask variable before
>>> trying to use it to restore the mask, so the signal mask is undefined
>>> after do_rt_sigreturn. This bug has been in all the time since
>>> 7181155d when do_rt_sigreturn was implemented for m68k.
>>>
[...]
> BTW: documentation of the stack frame / signature for non-SA_SIGINFO
> signal handlers seems to be quite lacking. There is a remark in the
> sigaction manpage, but that one obviously only applies to i386...
The best documentation is the kernel source: if you have a look at it
you will see that these functions (setup_frame(), do_sigreturn(), ...)
are just QEMU "translated" copy&paste.
Laurent