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/*
* Check decoding of setuid / setgid / setuid32 / setgid32 syscalls .
*
* Copyright ( c ) 2016 Dmitry V . Levin < ldv @ altlinux . org >
* All rights reserved .
*
* Redistribution and use in source and binary forms , with or without
* modification , are permitted provided that the following conditions
* are met :
* 1. Redistributions of source code must retain the above copyright
* notice , this list of conditions and the following disclaimer .
* 2. Redistributions in binary form must reproduce the above copyright
* notice , this list of conditions and the following disclaimer in the
* documentation and / or other materials provided with the distribution .
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission .
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ` ` AS IS ' ' AND ANY EXPRESS OR
* IMPLIED WARRANTIES , INCLUDING , BUT NOT LIMITED TO , THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED .
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT , INDIRECT ,
* INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT
* NOT LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS OF USE ,
* DATA , OR PROFITS ; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT
* ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE , EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE .
*/
# include <errno.h>
# include <stdio.h>
# include <unistd.h>
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void
printuid ( unsigned UGID_TYPE id )
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{
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if ( id = = ( unsigned UGID_TYPE ) - 1U )
printf ( " -1 " ) ;
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else
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printf ( " %u " , id ) ;
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}
int
main ( void )
{
unsigned int ugid = GETUGID ;
CHECK_OVERFLOWUGID ( ugid ) ;
const long tests [ ] = {
ugid ,
0xffff0000U | ugid ,
( unsigned long ) 0xffffffff00000000ULL | ugid ,
0xffffU ,
- 1U ,
- 1L
} ;
unsigned int i ;
for ( i = 0 ; i < ARRAY_SIZE ( tests ) ; + + i ) {
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const unsigned int num = ( unsigned UGID_TYPE ) tests [ i ] ;
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long expected ;
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errno = 0 ;
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if ( num = = ugid )
expected = 0 ;
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else if ( ( UGID_TYPE ) num = = ( UGID_TYPE ) - 1U )
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expected = - 1 ;
else
continue ;
const long rc = syscall ( SYSCALL_NR , tests [ i ] ) ;
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const char * errstr = sprintrc ( rc ) ;
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if ( rc ! = expected ) {
if ( ! i & & ENOSYS = = errno ) {
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printf ( " %s(%u) = %s \n " ,
SYSCALL_NAME , ugid , errstr ) ;
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break ;
}
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perror_msg_and_fail ( " %s(%#lx) = %ld != %ld " ,
SYSCALL_NAME , tests [ i ] ,
rc , expected ) ;
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}
printf ( " %s( " , SYSCALL_NAME ) ;
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printuid ( num ) ;
printf ( " ) = %s \n " , errstr ) ;
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}
puts ( " +++ exited with 0 +++ " ) ;
return 0 ;
}