[Bug libc/1780] [i386] size of sigset_t in ucontext_t structure does not match linux kernel

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=1780

Szabolcs Nagy <nszabolcs at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |nszabolcs at gmail dot com

--- Comment #9 from Szabolcs Nagy <nszabolcs at gmail dot com> ---
a better example is

  sigfillset(&uc->uc_sigmask)

which must work on an uc passed to a signal handler,
but linux uc_sigmask is 8 bytes on i386 and glibc
writes 128 bytes so it clobbers the stack.

the only conforming fix is to wrap signal handlers
and translate kernel ucontext (since sigset_t is a
struct or int type that can be assigned), but a good
enough solution is to make all apis taking sigset_t*
argument to only access bytes that are relevant to
the linux kernel (in this case the first 8 bytes only).

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