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From: Tom H. <to...@co...> - 2005-11-12 00:04:38
|
In message <200...@ac...>
Julian Seward <js...@ac...> wrote:
> The logic for this is at m_signals.c around line 1566. A vki_siginfo_t
> structure is supplied, and part of the tests to determine if this
> is a stack-extension kind of event is the condition "info->si_code == 1".
The 1 is actually SEGV_MAPERR and would appear to be correct. We
should probably define a VKI_SEGV_MAPERR constant properly.
The si_code values are POSIX defined - well the names are. The values
aren't but they are fairly standard across different Unix variants.
> On all mainstream Linux distros, including ppc32-linux, this works fine.
> However, on MontaVista(R) Linux(R) Professional Edition 3.1 running on
> an PPC440GX EVB (Ocotea), info->si_code shows up with not 1 but
> 0x30001. This messes up the logic and causes V to treat it as a normal
> segfault, which kills the app. If I mask it with 0xFFFF before the compare
> then everything works fine.
>
> So does anybody have a clue what the significance of 0x30001 vs 0x1 is?
> Paul?
It's a kernel internal detail that shouldn't be leaking to user
space - if you look at include/asm-generic/siginfo.h in the kernel
source you will see that SEGV_MAPERR is 0x30001 if __KERNEL__ is
defined and 1 if it isn't.
When copy_siginfo_to_user in kernel/signal.c copies the siginfo
structure out to user space it deliberately casts the si_code
value to a short to discard the top half of it.
It sounds like this MontaVista kernel is a bit broken...
Tom
--
Tom Hughes (to...@co...)
http://www.compton.nu/
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