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/*
* Copyright ( c ) 1999 - 2000 Wichert Akkerman < wichert @ cistron . nl >
* Copyright ( c ) 2002 - 2005 Roland McGrath < roland @ redhat . com >
* Copyright ( c ) 2008 Jan Kratochvil < jan . kratochvil @ redhat . com >
* Copyright ( c ) 2009 - 2013 Denys Vlasenko < dvlasenk @ redhat . com >
* Copyright ( c ) 2006 - 2015 Dmitry V . Levin < ldv @ altlinux . org >
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* Copyright ( c ) 2014 - 2017 The strace developers .
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* 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 .
*/
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# include "defs.h"
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# include <sched.h>
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# include <asm/unistd.h>
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# ifndef CSIGNAL
# define CSIGNAL 0x000000ff
# endif
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# include "xlat/clone_flags.h"
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# include "xlat/setns_types.h"
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# include "xlat/unshare_flags.h"
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# if defined IA64
# define ARG_FLAGS 0
# define ARG_STACK 1
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# define ARG_STACKSIZE (tcp->scno == __NR_clone2 ? 2 : -1)
# define ARG_PTID (tcp->scno == __NR_clone2 ? 3 : 2)
# define ARG_CTID (tcp->scno == __NR_clone2 ? 4 : 3)
# define ARG_TLS (tcp->scno == __NR_clone2 ? 5 : 4)
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# elif defined S390 || defined S390X || defined CRISV10 || defined CRISV32
# define ARG_STACK 0
# define ARG_FLAGS 1
# define ARG_PTID 2
# define ARG_CTID 3
# define ARG_TLS 4
# elif defined X86_64 || defined X32
/* x86 personality processes have the last two arguments flipped. */
# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_PTID 2
# define ARG_CTID ((current_personality != 1) ? 3 : 4)
# define ARG_TLS ((current_personality != 1) ? 4 : 3)
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# elif defined ALPHA || defined TILE || defined OR1K || defined RISCV
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# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_PTID 2
# define ARG_CTID 3
# define ARG_TLS 4
# else
# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_PTID 2
# define ARG_TLS 3
# define ARG_CTID 4
# endif
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static void
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print_tls_arg ( struct tcb * const tcp , const kernel_ulong_t addr )
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{
# ifdef HAVE_STRUCT_USER_DESC
# if SUPPORTED_PERSONALITIES > 1
if ( current_personality = = 1 )
# endif
{
print_user_desc ( tcp , tcp - > u_arg [ ARG_TLS ] ) ;
}
# if SUPPORTED_PERSONALITIES > 1
else
# endif
# endif /* HAVE_STRUCT_USER_DESC */
{
printaddr ( tcp - > u_arg [ ARG_TLS ] ) ;
}
}
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SYS_FUNC ( clone )
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{
if ( exiting ( tcp ) ) {
const char * sep = " | " ;
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kernel_ulong_t flags = tcp - > u_arg [ ARG_FLAGS ] ;
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tprints ( " child_stack= " ) ;
printaddr ( tcp - > u_arg [ ARG_STACK ] ) ;
tprints ( " , " ) ;
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# ifdef ARG_STACKSIZE
if ( ARG_STACKSIZE ! = - 1 )
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tprintf ( " stack_size=%# " PRI_klx " , " ,
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tcp - > u_arg [ ARG_STACKSIZE ] ) ;
# endif
tprints ( " flags= " ) ;
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if ( ! printflags64 ( clone_flags , flags & ~ CSIGNAL , NULL ) )
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sep = " " ;
if ( ( flags & CSIGNAL ) ! = 0 )
tprintf ( " %s%s " , sep , signame ( flags & CSIGNAL ) ) ;
if ( ( flags & ( CLONE_PARENT_SETTID | CLONE_CHILD_SETTID
| CLONE_CHILD_CLEARTID | CLONE_SETTLS ) ) = = 0 )
return 0 ;
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if ( flags & CLONE_PARENT_SETTID ) {
tprints ( " , parent_tidptr= " ) ;
printaddr ( tcp - > u_arg [ ARG_PTID ] ) ;
}
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if ( flags & CLONE_SETTLS ) {
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tprints ( " , tls= " ) ;
print_tls_arg ( tcp , tcp - > u_arg [ ARG_TLS ] ) ;
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}
if ( flags & ( CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID ) ) {
tprints ( " , child_tidptr= " ) ;
printaddr ( tcp - > u_arg [ ARG_CTID ] ) ;
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}
}
/* TODO on syscall entry:
* We can clear CLONE_PTRACE here since it is an ancient hack
* to allow us to catch children , and we use another hack for that .
* But CLONE_PTRACE can conceivably be used by malicious programs
* to subvert us . By clearing this bit , we can defend against it :
* in untraced execution , CLONE_PTRACE should have no effect .
*
* We can also clear CLONE_UNTRACED , since it allows to start
* children outside of our control . At the moment
* I ' m trying to figure out whether there is a * legitimate *
* use of this flag which we should respect .
*/
return 0 ;
}
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SYS_FUNC ( setns )
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{
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printfd ( tcp , tcp - > u_arg [ 0 ] ) ;
tprints ( " , " ) ;
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printxval ( setns_types , tcp - > u_arg [ 1 ] , " CLONE_NEW??? " ) ;
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return RVAL_DECODED ;
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}
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SYS_FUNC ( unshare )
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{
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printflags64 ( unshare_flags , tcp - > u_arg [ 0 ] , " CLONE_??? " ) ;
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return RVAL_DECODED ;
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}
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SYS_FUNC ( fork )
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{
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return RVAL_DECODED | RVAL_UDECIMAL ;
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}