Re: [hurd, commited] socket: Fix tst-cmsghdr-skeleton.c use of cmsg_len

[Andreas Schwab <schwab@linux-m68k.org>]

On Mai 01 2023, Samuel Thibault wrote:

> Andreas Schwab, le lun. 01 mai 2023 15:38:45 +0200, a ecrit:
>> On Mai 01 2023, Samuel Thibault wrote:
>> 
>> > cmsg_len is supposed to be socklen_t according to standards, but it was made
>> > size_t on Linux, see BZ 16919. For ports that have it socklen_t, SIZE_MAX is
>> > too large. We can however explicitly cast it to the type of cmsg_len so it
>> > will fit according to that type.
>> > ---
>> >  socket/tst-cmsghdr-skeleton.c | 2 +-
>> >  1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > diff --git a/socket/tst-cmsghdr-skeleton.c b/socket/tst-cmsghdr-skeleton.c
>> > index 296a0a8581..9516139f87 100644
>> > --- a/socket/tst-cmsghdr-skeleton.c
>> > +++ b/socket/tst-cmsghdr-skeleton.c
>> > @@ -49,7 +49,7 @@ RUN_TEST_FUNCNAME (CMSG_NXTHDR_IMPL) (void)
>> >    /* The first header length is so big, using it would cause an overflow.  */
>> >    cmsg = CMSG_FIRSTHDR (&m);
>> >    TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
>> > -  cmsg->cmsg_len = SIZE_MAX;
>> > +  cmsg->cmsg_len = (__typeof (cmsg->cmsg_len)) SIZE_MAX;
>> 
>> What does that fix?
>
> 64bit hurd, where cmsg_len is socklen_t as the standards require (thus
> 32bit).

And what does it fix?

-- 
Andreas Schwab, schwab@linux-m68k.org
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