[PATCH v2] linux: Enforce zero fill of siginfo_t

[Florian Weimer]

* Andreas Schwab:

> On Jan 20 2026, Adhemerval Zanella wrote:
>
>> +    siginfo_t info;
>> +    /* The glibc siginfo struct is larger than the kABI one, and the kernel
>> +       enforces that for an unknown si_code, all the extra bytes should be 0.  */
>
> Why does the kernel even look at anything beyond the struct size?  That
> looks like a kernel bug.

I think it looks beyond the part that is initialized by the struct
aggregate.  This sub-struct is apparently smaller than the entire kernel
structure.

Thanks,
Florian