Re: [LTP] [PATCH] syscalls/setgroups: fix implicit SETGROUPS parameter casting

[chrubis@suse.cz]

Hi!
> Thank you for this point.
> 
> At first sight it seems that this testcase is very specific for i386 
> (maybe for other architectures also).
> 
> In i386 I found two variants of setgroups syscall (from 
> arch/x86/syscalls/syscall_32.tbl):
>      81      i386    setgroups               sys_setgroups16
>      206     i386    setgroups32             sys_setgroups
> 
> I guess in i386 glibc handler for setgroups() internally uses 
> _setgroups32_ syscall.
> 
> In x86_64 there is only one variant (from arch/x86/syscalls/syscall_64.tbl):
>      116     common  setgroups               sys_setgroups
> 
> which points to 32-bit version.
> 
> But It's just an assumption and I'll verify this.

The 16 variant is backward compatibility for old programs using this
binari ABI so it makes sense that it does not exist on architectures
that Linux were ported to after the 32 bit syscall was created.

-- 
Cyril Hrubis
chrubis@suse.cz

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