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165 lines
5.1 KiB
165 lines
5.1 KiB
/* |
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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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* Copyright (c) 2014-2017 The strace developers. |
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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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#include <asm/unistd.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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#include "xlat/setns_types.h" |
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#include "xlat/unshare_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 == __NR_clone2 ? 2 : -1) |
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# define ARG_PTID (tcp->scno == __NR_clone2 ? 3 : 2) |
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# define ARG_CTID (tcp->scno == __NR_clone2 ? 4 : 3) |
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# define ARG_TLS (tcp->scno == __NR_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 || defined RISCV |
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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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static void |
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print_tls_arg(struct tcb *const tcp, const kernel_ulong_t addr) |
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{ |
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#ifdef HAVE_STRUCT_USER_DESC |
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# if SUPPORTED_PERSONALITIES > 1 |
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if (current_personality == 1) |
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# endif |
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{ |
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print_user_desc(tcp, tcp->u_arg[ARG_TLS]); |
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} |
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# if SUPPORTED_PERSONALITIES > 1 |
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else |
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# endif |
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#endif /* HAVE_STRUCT_USER_DESC */ |
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{ |
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printaddr(tcp->u_arg[ARG_TLS]); |
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} |
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} |
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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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kernel_ulong_t flags = tcp->u_arg[ARG_FLAGS]; |
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tprints("child_stack="); |
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printaddr(tcp->u_arg[ARG_STACK]); |
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tprints(", "); |
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#ifdef ARG_STACKSIZE |
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if (ARG_STACKSIZE != -1) |
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tprintf("stack_size=%#" PRI_klx ", ", |
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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 (!printflags64(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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tprints(", parent_tidptr="); |
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printaddr(tcp->u_arg[ARG_PTID]); |
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} |
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if (flags & CLONE_SETTLS) { |
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tprints(", tls="); |
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print_tls_arg(tcp, 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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tprints(", child_tidptr="); |
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printaddr(tcp->u_arg[ARG_CTID]); |
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} |
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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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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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}
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