Bug#183694: problem of 32 bit uid or gid in glibc

[GOTO Masanori <gotom@debian.or.jp>]

At Fri, 07 Mar 2003 05:15:53 +0900,
kakuma fumihiko wrote:
>  Running samba as file server on i686 under Debian Woody.
> When client access shared file on uid of 65535 by Windows2k
> and open the property of shared file, ACL information can't
> refernce. This means that it happen error in samba.
> Samba works good on uid less than 65535.

Is this happened even if uid is over 65535?

>  Show a easy test case.
> 
> $ su -
> # cat > idt.c
> #include <stdio.h>
> #include <stdlib.h>
> #include <errno.h>
> #include <unistd.h>
> 
> #define UID 65535
> 
> main()
> {
> 	int ret;
> 	unsigned int euid;
> 
> 	errno=ENOSYS;
> 	if( seteuid(UID) == -1 )
> 		exit(-1);
> 
> 	euid = geteuid();
> 	printf("geteuid() errno=%d uid=%d\n", errno, euid);
> 	ret = seteuid(UID);
> 	printf("seteuid() errno=%d ret=%d\n", errno, ret);
> 	
> }
> # cc -o idt idt.c
> # ./idt
> geteuid() errno=38 uid=65535
> seteuid() errno=22 ret=-1
> #

The first seteuid sets to non-root-priviledged.
Then the second seteuid() should reject to change euid.
Is this example correct?

Regards,
-- gotom