Dmitry V. Levin
38a34c9349
Before this change, all files that exist since 20th century had copyright headers, while most files that appeared later didn't. This change fixes the inconsistency by adding missing copyright headers. It doesn't mean that copyright headers became maintained. In my view, git history provides much better information on this subject and is much more accurate than copyright headers.
153 lines
4.9 KiB
C
153 lines
4.9 KiB
C
/*
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* Copyright (c) 1999-2000 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
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* Copyright (c) 2008 Jan Kratochvil <jan.kratochvil@redhat.com>
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* Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
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* Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include <sched.h>
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#ifndef CSIGNAL
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# define CSIGNAL 0x000000ff
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#endif
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#include "xlat/clone_flags.h"
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#if defined IA64
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# define ARG_FLAGS 0
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# define ARG_STACK 1
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# define ARG_STACKSIZE (tcp->scno == SYS_clone2 ? 2 : -1)
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# define ARG_PTID (tcp->scno == SYS_clone2 ? 3 : 2)
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# define ARG_CTID (tcp->scno == SYS_clone2 ? 4 : 3)
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# define ARG_TLS (tcp->scno == SYS_clone2 ? 5 : 4)
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#elif defined S390 || defined S390X || defined CRISV10 || defined CRISV32
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# define ARG_STACK 0
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# define ARG_FLAGS 1
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# define ARG_PTID 2
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# define ARG_CTID 3
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# define ARG_TLS 4
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#elif defined X86_64 || defined X32
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/* x86 personality processes have the last two arguments flipped. */
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# define ARG_FLAGS 0
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# define ARG_STACK 1
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# define ARG_PTID 2
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# define ARG_CTID ((current_personality != 1) ? 3 : 4)
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# define ARG_TLS ((current_personality != 1) ? 4 : 3)
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#elif defined ALPHA || defined TILE || defined OR1K
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# define ARG_FLAGS 0
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# define ARG_STACK 1
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# define ARG_PTID 2
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# define ARG_CTID 3
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# define ARG_TLS 4
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#else
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# define ARG_FLAGS 0
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# define ARG_STACK 1
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# define ARG_PTID 2
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# define ARG_TLS 3
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# define ARG_CTID 4
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#endif
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#if defined I386 || defined X86_64 || defined X32
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extern void print_user_desc(struct tcb *, long);
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#endif /* I386 || X86_64 || X32 */
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SYS_FUNC(clone)
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{
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if (exiting(tcp)) {
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const char *sep = "|";
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unsigned long flags = tcp->u_arg[ARG_FLAGS];
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tprintf("child_stack=%#lx, ", tcp->u_arg[ARG_STACK]);
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#ifdef ARG_STACKSIZE
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if (ARG_STACKSIZE != -1)
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tprintf("stack_size=%#lx, ",
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tcp->u_arg[ARG_STACKSIZE]);
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#endif
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tprints("flags=");
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if (!printflags(clone_flags, flags &~ CSIGNAL, NULL))
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sep = "";
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if ((flags & CSIGNAL) != 0)
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tprintf("%s%s", sep, signame(flags & CSIGNAL));
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if ((flags & (CLONE_PARENT_SETTID|CLONE_CHILD_SETTID
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|CLONE_CHILD_CLEARTID|CLONE_SETTLS)) == 0)
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return 0;
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if (flags & CLONE_PARENT_SETTID)
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tprintf(", parent_tidptr=%#lx", tcp->u_arg[ARG_PTID]);
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if (flags & CLONE_SETTLS) {
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#if defined I386 || defined X86_64 || defined X32
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# ifndef I386
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if (current_personality == 1)
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# endif
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{
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tprints(", tls=");
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print_user_desc(tcp, tcp->u_arg[ARG_TLS]);
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}
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# ifndef I386
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else
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# endif
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#endif /* I386 || X86_64 || X32 */
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tprintf(", tls=%#lx", tcp->u_arg[ARG_TLS]);
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}
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if (flags & (CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID))
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tprintf(", child_tidptr=%#lx", tcp->u_arg[ARG_CTID]);
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}
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/* TODO on syscall entry:
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* We can clear CLONE_PTRACE here since it is an ancient hack
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* to allow us to catch children, and we use another hack for that.
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* But CLONE_PTRACE can conceivably be used by malicious programs
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* to subvert us. By clearing this bit, we can defend against it:
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* in untraced execution, CLONE_PTRACE should have no effect.
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*
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* We can also clear CLONE_UNTRACED, since it allows to start
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* children outside of our control. At the moment
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* I'm trying to figure out whether there is a *legitimate*
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* use of this flag which we should respect.
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*/
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return 0;
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}
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SYS_FUNC(setns)
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{
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printfd(tcp, tcp->u_arg[0]);
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tprints(", ");
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printflags(clone_flags, tcp->u_arg[1], "CLONE_???");
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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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printflags(clone_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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}
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