1296 lines
31 KiB
C
1296 lines
31 KiB
C
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Linux for s390 port by D.J. Barrow
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* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
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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 "native_defs.h"
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#include "nsig.h"
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#include <sys/param.h>
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/* for struct iovec */
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#include <sys/uio.h>
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/* for __X32_SYSCALL_BIT */
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#include <asm/unistd.h>
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#include "regs.h"
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#include "ptrace.h"
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#if defined(SPARC64)
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# undef PTRACE_GETREGS
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# define PTRACE_GETREGS PTRACE_GETREGS64
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# undef PTRACE_SETREGS
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# define PTRACE_SETREGS PTRACE_SETREGS64
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#endif
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#if defined SPARC64
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# include <asm/psrcompat.h>
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#elif defined SPARC
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# include <asm/psr.h>
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#endif
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#ifdef IA64
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# include <asm/rse.h>
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#endif
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#ifndef NT_PRSTATUS
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# define NT_PRSTATUS 1
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#endif
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#include "syscall.h"
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/* Define these shorthand notations to simplify the syscallent files. */
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#define TD TRACE_DESC
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#define TF TRACE_FILE
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#define TI TRACE_IPC
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#define TN TRACE_NETWORK
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#define TP TRACE_PROCESS
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#define TS TRACE_SIGNAL
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#define TM TRACE_MEMORY
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#define NF SYSCALL_NEVER_FAILS
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#define MA MAX_ARGS
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#define SI STACKTRACE_INVALIDATE_CACHE
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#define SE STACKTRACE_CAPTURE_ON_ENTER
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#define CST COMPAT_SYSCALL_TYPES
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#define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
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const struct_sysent sysent0[] = {
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#include "syscallent.h"
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};
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#if SUPPORTED_PERSONALITIES > 1
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# include PERSONALITY1_INCLUDE_FUNCS
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static const struct_sysent sysent1[] = {
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# include "syscallent1.h"
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};
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#endif
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#if SUPPORTED_PERSONALITIES > 2
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# include PERSONALITY2_INCLUDE_FUNCS
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static const struct_sysent sysent2[] = {
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# include "syscallent2.h"
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};
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#endif
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/* Now undef them since short defines cause wicked namespace pollution. */
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#undef SEN
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#undef TD
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#undef TF
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#undef TI
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#undef TN
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#undef TP
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#undef TS
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#undef TM
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#undef NF
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#undef MA
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#undef SI
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#undef SE
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#undef CST
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/*
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* `ioctlent[012].h' files are automatically generated by the auxiliary
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* program `ioctlsort', such that the list is sorted by the `code' field.
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* This has the side-effect of resolving the _IO.. macros into
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* plain integers, eliminating the need to include here everything
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* in "/usr/include".
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*/
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const char *const errnoent0[] = {
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#include "errnoent.h"
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};
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const char *const signalent0[] = {
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#include "signalent.h"
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};
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const struct_ioctlent ioctlent0[] = {
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#include "ioctlent0.h"
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};
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#if SUPPORTED_PERSONALITIES > 1
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static const char *const errnoent1[] = {
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# include "errnoent1.h"
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};
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static const char *const signalent1[] = {
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# include "signalent1.h"
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};
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static const struct_ioctlent ioctlent1[] = {
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# include "ioctlent1.h"
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};
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# include PERSONALITY0_INCLUDE_PRINTERS_DECLS
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static const struct_printers printers0 = {
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# include PERSONALITY0_INCLUDE_PRINTERS_DEFS
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};
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# include PERSONALITY1_INCLUDE_PRINTERS_DECLS
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static const struct_printers printers1 = {
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# include PERSONALITY1_INCLUDE_PRINTERS_DEFS
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};
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#endif
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#if SUPPORTED_PERSONALITIES > 2
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static const char *const errnoent2[] = {
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# include "errnoent2.h"
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};
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static const char *const signalent2[] = {
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# include "signalent2.h"
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};
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static const struct_ioctlent ioctlent2[] = {
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# include "ioctlent2.h"
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};
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# include PERSONALITY2_INCLUDE_PRINTERS_DECLS
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static const struct_printers printers2 = {
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# include PERSONALITY2_INCLUDE_PRINTERS_DEFS
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};
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#endif
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enum {
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nsyscalls0 = ARRAY_SIZE(sysent0)
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#if SUPPORTED_PERSONALITIES > 1
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, nsyscalls1 = ARRAY_SIZE(sysent1)
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# if SUPPORTED_PERSONALITIES > 2
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, nsyscalls2 = ARRAY_SIZE(sysent2)
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# endif
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#endif
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};
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enum {
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nerrnos0 = ARRAY_SIZE(errnoent0)
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#if SUPPORTED_PERSONALITIES > 1
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, nerrnos1 = ARRAY_SIZE(errnoent1)
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# if SUPPORTED_PERSONALITIES > 2
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, nerrnos2 = ARRAY_SIZE(errnoent2)
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# endif
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#endif
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};
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enum {
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nsignals0 = ARRAY_SIZE(signalent0)
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#if SUPPORTED_PERSONALITIES > 1
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, nsignals1 = ARRAY_SIZE(signalent1)
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# if SUPPORTED_PERSONALITIES > 2
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, nsignals2 = ARRAY_SIZE(signalent2)
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# endif
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#endif
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};
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enum {
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nioctlents0 = ARRAY_SIZE(ioctlent0)
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#if SUPPORTED_PERSONALITIES > 1
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, nioctlents1 = ARRAY_SIZE(ioctlent1)
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# if SUPPORTED_PERSONALITIES > 2
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, nioctlents2 = ARRAY_SIZE(ioctlent2)
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# endif
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#endif
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};
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#if SUPPORTED_PERSONALITIES > 1
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const struct_sysent *sysent = sysent0;
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const char *const *errnoent = errnoent0;
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const char *const *signalent = signalent0;
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const struct_ioctlent *ioctlent = ioctlent0;
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const struct_printers *printers = &printers0;
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#endif
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unsigned nsyscalls = nsyscalls0;
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unsigned nerrnos = nerrnos0;
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unsigned nsignals = nsignals0;
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unsigned nioctlents = nioctlents0;
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const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
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nsyscalls0,
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#if SUPPORTED_PERSONALITIES > 1
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nsyscalls1,
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#endif
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#if SUPPORTED_PERSONALITIES > 2
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nsyscalls2,
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#endif
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};
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const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
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sysent0,
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#if SUPPORTED_PERSONALITIES > 1
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sysent1,
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#endif
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#if SUPPORTED_PERSONALITIES > 2
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sysent2,
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#endif
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};
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#if SUPPORTED_PERSONALITIES > 1
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unsigned current_personality;
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# ifndef current_wordsize
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unsigned current_wordsize;
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static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
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PERSONALITY0_WORDSIZE,
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PERSONALITY1_WORDSIZE,
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# if SUPPORTED_PERSONALITIES > 2
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PERSONALITY2_WORDSIZE,
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# endif
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};
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# endif
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# ifndef current_klongsize
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unsigned current_klongsize;
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static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
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PERSONALITY0_KLONGSIZE,
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PERSONALITY1_KLONGSIZE,
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# if SUPPORTED_PERSONALITIES > 2
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PERSONALITY2_KLONGSIZE,
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# endif
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};
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# endif
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void
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set_personality(int personality)
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{
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nsyscalls = nsyscall_vec[personality];
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sysent = sysent_vec[personality];
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switch (personality) {
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case 0:
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errnoent = errnoent0;
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nerrnos = nerrnos0;
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ioctlent = ioctlent0;
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nioctlents = nioctlents0;
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signalent = signalent0;
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nsignals = nsignals0;
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printers = &printers0;
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break;
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case 1:
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errnoent = errnoent1;
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nerrnos = nerrnos1;
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ioctlent = ioctlent1;
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nioctlents = nioctlents1;
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signalent = signalent1;
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nsignals = nsignals1;
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printers = &printers1;
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break;
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# if SUPPORTED_PERSONALITIES > 2
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case 2:
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errnoent = errnoent2;
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nerrnos = nerrnos2;
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ioctlent = ioctlent2;
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nioctlents = nioctlents2;
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signalent = signalent2;
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nsignals = nsignals2;
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printers = &printers2;
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break;
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# endif
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}
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current_personality = personality;
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# ifndef current_wordsize
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current_wordsize = personality_wordsize[personality];
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# endif
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# ifndef current_klongsize
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current_klongsize = personality_klongsize[personality];
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# endif
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}
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static void
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update_personality(struct tcb *tcp, unsigned int personality)
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{
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if (personality == current_personality)
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return;
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set_personality(personality);
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if (personality == tcp->currpers)
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return;
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tcp->currpers = personality;
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# undef PERSONALITY_NAMES
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# if defined POWERPC64
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# define PERSONALITY_NAMES {"64 bit", "32 bit"}
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# elif defined X86_64
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# define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
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# elif defined X32
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# define PERSONALITY_NAMES {"x32", "32 bit"}
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# elif defined AARCH64
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# define PERSONALITY_NAMES {"64 bit", "32 bit"}
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# elif defined TILE
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# define PERSONALITY_NAMES {"64-bit", "32-bit"}
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# endif
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# ifdef PERSONALITY_NAMES
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if (!qflag) {
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static const char *const names[] = PERSONALITY_NAMES;
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error_msg("[ Process PID=%d runs in %s mode. ]",
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tcp->pid, names[personality]);
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}
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# endif
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}
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#endif
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#ifdef SYS_socket_subcall
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static void
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decode_socket_subcall(struct tcb *tcp)
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{
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const int call = tcp->u_arg[0];
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if (call < 1 || call >= SYS_socket_nsubcalls)
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return;
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const kernel_ulong_t scno = SYS_socket_subcall + call;
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const unsigned int nargs = sysent[scno].nargs;
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uint64_t buf[nargs];
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if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
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return;
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tcp->scno = scno;
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tcp->qual_flg = qual_flags(scno);
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tcp->s_ent = &sysent[scno];
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unsigned int i;
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for (i = 0; i < nargs; ++i)
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tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
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? ((uint32_t *) (void *) buf)[i] : buf[i];
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}
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#endif
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#ifdef SYS_ipc_subcall
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static void
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decode_ipc_subcall(struct tcb *tcp)
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{
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unsigned int call = tcp->u_arg[0];
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const unsigned int version = call >> 16;
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if (version) {
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# if defined S390 || defined S390X
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return;
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# else
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# ifdef SPARC64
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if (current_wordsize == 8)
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return;
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# endif
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set_tcb_priv_ulong(tcp, version);
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call &= 0xffff;
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# endif
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}
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switch (call) {
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case 1: case 2: case 3: case 4:
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case 11: case 12: case 13: case 14:
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case 21: case 22: case 23: case 24:
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break;
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default:
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return;
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}
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tcp->scno = SYS_ipc_subcall + call;
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tcp->qual_flg = qual_flags(tcp->scno);
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tcp->s_ent = &sysent[tcp->scno];
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const unsigned int n = tcp->s_ent->nargs;
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unsigned int i;
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for (i = 0; i < n; i++)
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tcp->u_arg[i] = tcp->u_arg[i + 1];
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}
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#endif
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#ifdef LINUX_MIPSO32
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static void
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decode_mips_subcall(struct tcb *tcp)
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{
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if (!scno_is_valid(tcp->u_arg[0]))
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return;
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tcp->scno = tcp->u_arg[0];
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tcp->qual_flg = qual_flags(tcp->scno);
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tcp->s_ent = &sysent[tcp->scno];
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memmove(&tcp->u_arg[0], &tcp->u_arg[1],
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sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
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/*
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* Fetching the last arg of 7-arg syscalls (fadvise64_64
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* and sync_file_range) requires additional code,
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* see linux/mips/get_syscall_args.c
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*/
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if (tcp->s_ent->nargs == MAX_ARGS) {
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if (umoven(tcp,
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mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
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sizeof(tcp->u_arg[0]),
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&tcp->u_arg[MAX_ARGS - 1]) < 0)
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tcp->u_arg[MAX_ARGS - 1] = 0;
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}
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}
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#endif /* LINUX_MIPSO32 */
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static void
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dumpio(struct tcb *tcp)
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{
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if (syserror(tcp))
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return;
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int fd = tcp->u_arg[0];
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if (fd < 0)
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return;
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if (is_number_in_set(fd, &read_set)) {
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switch (tcp->s_ent->sen) {
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case SEN_read:
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case SEN_pread:
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case SEN_recv:
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case SEN_recvfrom:
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case SEN_mq_timedreceive:
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dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
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return;
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case SEN_readv:
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case SEN_preadv:
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case SEN_preadv2:
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dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
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tcp->u_rval);
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return;
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case SEN_recvmsg:
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dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
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return;
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case SEN_recvmmsg:
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dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
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return;
|
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}
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}
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if (is_number_in_set(fd, &write_set)) {
|
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switch (tcp->s_ent->sen) {
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case SEN_write:
|
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case SEN_pwrite:
|
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case SEN_send:
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case SEN_sendto:
|
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case SEN_mq_timedsend:
|
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dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
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break;
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case SEN_writev:
|
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case SEN_pwritev:
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case SEN_pwritev2:
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case SEN_vmsplice:
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dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
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break;
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case SEN_sendmsg:
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dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
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break;
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case SEN_sendmmsg:
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dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
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break;
|
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}
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|
}
|
|
}
|
|
|
|
/*
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* Shuffle syscall numbers so that we don't have huge gaps in syscall table.
|
|
* The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
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*/
|
|
static kernel_ulong_t
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shuffle_scno(kernel_ulong_t scno)
|
|
{
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|
#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
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|
if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
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return scno;
|
|
|
|
/* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
|
|
if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
|
|
return 0x000ffff0;
|
|
if (scno == 0x000ffff0)
|
|
return ARM_FIRST_SHUFFLED_SYSCALL;
|
|
|
|
# define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
|
|
/*
|
|
* Is it ARM specific syscall?
|
|
* Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
|
|
* with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
|
|
*/
|
|
if (scno >= 0x000f0000 &&
|
|
scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
|
|
return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
|
|
}
|
|
if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
|
|
return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
|
|
}
|
|
#endif /* ARM || AARCH64 */
|
|
|
|
return scno;
|
|
}
|
|
|
|
const char *
|
|
err_name(unsigned long err)
|
|
{
|
|
if ((err < nerrnos) && errnoent[err])
|
|
return errnoent[err];
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static long get_regs_error;
|
|
|
|
void
|
|
clear_regs(void)
|
|
{
|
|
get_regs_error = -1;
|
|
}
|
|
|
|
static int get_syscall_args(struct tcb *);
|
|
static int get_syscall_result(struct tcb *);
|
|
static int arch_get_scno(struct tcb *tcp);
|
|
static int arch_set_scno(struct tcb *, kernel_ulong_t);
|
|
static void get_error(struct tcb *, const bool);
|
|
static int arch_set_error(struct tcb *);
|
|
static int arch_set_success(struct tcb *);
|
|
|
|
struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
|
|
|
|
static struct inject_opts *
|
|
tcb_inject_opts(struct tcb *tcp)
|
|
{
|
|
return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
|
|
? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
|
|
}
|
|
|
|
|
|
static long
|
|
tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
|
|
{
|
|
if (!tcp->inject_vec[current_personality]) {
|
|
tcp->inject_vec[current_personality] =
|
|
xcalloc(nsyscalls, sizeof(**inject_vec));
|
|
memcpy(tcp->inject_vec[current_personality],
|
|
inject_vec[current_personality],
|
|
nsyscalls * sizeof(**inject_vec));
|
|
}
|
|
|
|
struct inject_opts *opts = tcb_inject_opts(tcp);
|
|
|
|
if (!opts || opts->first == 0)
|
|
return 0;
|
|
|
|
--opts->first;
|
|
|
|
if (opts->first != 0)
|
|
return 0;
|
|
|
|
opts->first = opts->step;
|
|
|
|
if (opts->signo > 0)
|
|
*signo = opts->signo;
|
|
if (opts->rval != INJECT_OPTS_RVAL_DEFAULT && !arch_set_scno(tcp, -1))
|
|
tcp->flags |= TCB_TAMPERED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long
|
|
tamper_with_syscall_exiting(struct tcb *tcp)
|
|
{
|
|
struct inject_opts *opts = tcb_inject_opts(tcp);
|
|
|
|
if (!opts)
|
|
return 0;
|
|
|
|
if (opts->rval >= 0) {
|
|
kernel_long_t u_rval = tcp->u_rval;
|
|
|
|
tcp->u_rval = opts->rval;
|
|
if (arch_set_success(tcp)) {
|
|
tcp->u_rval = u_rval;
|
|
} else {
|
|
tcp->u_error = 0;
|
|
}
|
|
} else {
|
|
unsigned long new_error = -opts->rval;
|
|
|
|
if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
|
|
unsigned long u_error = tcp->u_error;
|
|
|
|
tcp->u_error = new_error;
|
|
if (arch_set_error(tcp)) {
|
|
tcp->u_error = u_error;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
trace_syscall_entering(struct tcb *tcp, unsigned int *sig)
|
|
{
|
|
int res, scno_good;
|
|
|
|
scno_good = res = get_scno(tcp);
|
|
if (res == 0)
|
|
return res;
|
|
if (res == 1)
|
|
res = get_syscall_args(tcp);
|
|
|
|
if (res != 1) {
|
|
printleader(tcp);
|
|
tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
|
|
/*
|
|
* " <unavailable>" will be added later by the code which
|
|
* detects ptrace errors.
|
|
*/
|
|
goto ret;
|
|
}
|
|
|
|
#ifdef LINUX_MIPSO32
|
|
if (SEN_syscall == tcp->s_ent->sen)
|
|
decode_mips_subcall(tcp);
|
|
#endif
|
|
|
|
#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
|
|
switch (tcp->s_ent->sen) {
|
|
# ifdef SYS_socket_subcall
|
|
case SEN_socketcall:
|
|
decode_socket_subcall(tcp);
|
|
break;
|
|
# endif
|
|
# ifdef SYS_ipc_subcall
|
|
case SEN_ipc:
|
|
decode_ipc_subcall(tcp);
|
|
break;
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
/* Restrain from fault injection while the trace executes strace code. */
|
|
if (hide_log(tcp)) {
|
|
tcp->qual_flg &= ~QUAL_INJECT;
|
|
}
|
|
|
|
switch (tcp->s_ent->sen) {
|
|
case SEN_execve:
|
|
case SEN_execveat:
|
|
#if defined SPARC || defined SPARC64
|
|
case SEN_execv:
|
|
#endif
|
|
tcp->flags &= ~TCB_HIDE_LOG;
|
|
break;
|
|
}
|
|
|
|
if (!(tcp->qual_flg & QUAL_TRACE)
|
|
|| (tracing_paths && !pathtrace_match(tcp))
|
|
) {
|
|
tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
|
|
tcp->sys_func_rval = 0;
|
|
return 0;
|
|
}
|
|
|
|
tcp->flags &= ~TCB_FILTERED;
|
|
|
|
if (hide_log(tcp)) {
|
|
res = 0;
|
|
goto ret;
|
|
}
|
|
|
|
if (tcp->qual_flg & QUAL_INJECT)
|
|
tamper_with_syscall_entering(tcp, sig);
|
|
|
|
if (cflag == CFLAG_ONLY_STATS) {
|
|
res = 0;
|
|
goto ret;
|
|
}
|
|
|
|
#ifdef USE_LIBUNWIND
|
|
if (stack_trace_enabled) {
|
|
if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
|
|
unwind_capture_stacktrace(tcp);
|
|
}
|
|
#endif
|
|
|
|
printleader(tcp);
|
|
tprintf("%s(", tcp->s_ent->sys_name);
|
|
if (tcp->qual_flg & QUAL_RAW)
|
|
res = printargs(tcp);
|
|
else
|
|
res = tcp->s_ent->sys_func(tcp);
|
|
|
|
fflush(tcp->outf);
|
|
ret:
|
|
tcp->flags |= TCB_INSYSCALL;
|
|
tcp->sys_func_rval = res;
|
|
/* Measure the entrance time as late as possible to avoid errors. */
|
|
if (Tflag || cflag)
|
|
gettimeofday(&tcp->etime, NULL);
|
|
return res;
|
|
}
|
|
|
|
static bool
|
|
syscall_tampered(struct tcb *tcp)
|
|
{
|
|
return tcp->flags & TCB_TAMPERED;
|
|
}
|
|
|
|
static int
|
|
trace_syscall_exiting(struct tcb *tcp)
|
|
{
|
|
int sys_res;
|
|
struct timeval tv;
|
|
int res;
|
|
unsigned long u_error;
|
|
const char *u_error_str;
|
|
|
|
/* Measure the exit time as early as possible to avoid errors. */
|
|
if (Tflag || cflag)
|
|
gettimeofday(&tv, NULL);
|
|
|
|
#ifdef USE_LIBUNWIND
|
|
if (stack_trace_enabled) {
|
|
if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
|
|
unwind_cache_invalidate(tcp);
|
|
}
|
|
#endif
|
|
|
|
#if SUPPORTED_PERSONALITIES > 1
|
|
update_personality(tcp, tcp->currpers);
|
|
#endif
|
|
res = (get_regs_error ? -1 : get_syscall_result(tcp));
|
|
if (filtered(tcp) || hide_log(tcp))
|
|
goto ret;
|
|
|
|
if (syserror(tcp) && syscall_tampered(tcp))
|
|
tamper_with_syscall_exiting(tcp);
|
|
|
|
if (cflag) {
|
|
count_syscall(tcp, &tv);
|
|
if (cflag == CFLAG_ONLY_STATS) {
|
|
goto ret;
|
|
}
|
|
}
|
|
|
|
/* If not in -ff mode, and printing_tcp != tcp,
|
|
* then the log currently does not end with output
|
|
* of _our syscall entry_, but with something else.
|
|
* We need to say which syscall's return is this.
|
|
*
|
|
* Forced reprinting via TCB_REPRINT is used only by
|
|
* "strace -ff -oLOG test/threaded_execve" corner case.
|
|
* It's the only case when -ff mode needs reprinting.
|
|
*/
|
|
if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
|
|
tcp->flags &= ~TCB_REPRINT;
|
|
printleader(tcp);
|
|
tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
|
|
}
|
|
printing_tcp = tcp;
|
|
|
|
tcp->s_prev_ent = NULL;
|
|
if (res != 1) {
|
|
/* There was error in one of prior ptrace ops */
|
|
tprints(") ");
|
|
tabto();
|
|
tprints("= ? <unavailable>\n");
|
|
line_ended();
|
|
tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
|
|
tcp->sys_func_rval = 0;
|
|
free_tcb_priv_data(tcp);
|
|
return res;
|
|
}
|
|
tcp->s_prev_ent = tcp->s_ent;
|
|
|
|
sys_res = 0;
|
|
if (tcp->qual_flg & QUAL_RAW) {
|
|
/* sys_res = printargs(tcp); - but it's nop on sysexit */
|
|
} else {
|
|
/* FIXME: not_failing_only (IOW, option -z) is broken:
|
|
* failure of syscall is known only after syscall return.
|
|
* Thus we end up with something like this on, say, ENOENT:
|
|
* open("doesnt_exist", O_RDONLY <unfinished ...>
|
|
* {next syscall decode}
|
|
* whereas the intended result is that open(...) line
|
|
* is not shown at all.
|
|
*/
|
|
if (not_failing_only && tcp->u_error)
|
|
goto ret; /* ignore failed syscalls */
|
|
if (tcp->sys_func_rval & RVAL_DECODED)
|
|
sys_res = tcp->sys_func_rval;
|
|
else
|
|
sys_res = tcp->s_ent->sys_func(tcp);
|
|
}
|
|
|
|
tprints(") ");
|
|
tabto();
|
|
u_error = tcp->u_error;
|
|
|
|
if (tcp->qual_flg & QUAL_RAW) {
|
|
if (u_error) {
|
|
tprintf("= -1 (errno %lu)", u_error);
|
|
} else {
|
|
tprintf("= %#" PRI_klx, tcp->u_rval);
|
|
}
|
|
if (syscall_tampered(tcp))
|
|
tprints(" (INJECTED)");
|
|
}
|
|
else if (!(sys_res & RVAL_NONE) && u_error) {
|
|
switch (u_error) {
|
|
/* Blocked signals do not interrupt any syscalls.
|
|
* In this case syscalls don't return ERESTARTfoo codes.
|
|
*
|
|
* Deadly signals set to SIG_DFL interrupt syscalls
|
|
* and kill the process regardless of which of the codes below
|
|
* is returned by the interrupted syscall.
|
|
* In some cases, kernel forces a kernel-generated deadly
|
|
* signal to be unblocked and set to SIG_DFL (and thus cause
|
|
* death) if it is blocked or SIG_IGNed: for example, SIGSEGV
|
|
* or SIGILL. (The alternative is to leave process spinning
|
|
* forever on the faulty instruction - not useful).
|
|
*
|
|
* SIG_IGNed signals and non-deadly signals set to SIG_DFL
|
|
* (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
|
|
* but kernel will always restart them.
|
|
*/
|
|
case ERESTARTSYS:
|
|
/* Most common type of signal-interrupted syscall exit code.
|
|
* The system call will be restarted with the same arguments
|
|
* if SA_RESTART is set; otherwise, it will fail with EINTR.
|
|
*/
|
|
tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
|
|
break;
|
|
case ERESTARTNOINTR:
|
|
/* Rare. For example, fork() returns this if interrupted.
|
|
* SA_RESTART is ignored (assumed set): the restart is unconditional.
|
|
*/
|
|
tprints("= ? ERESTARTNOINTR (To be restarted)");
|
|
break;
|
|
case ERESTARTNOHAND:
|
|
/* pause(), rt_sigsuspend() etc use this code.
|
|
* SA_RESTART is ignored (assumed not set):
|
|
* syscall won't restart (will return EINTR instead)
|
|
* even after signal with SA_RESTART set. However,
|
|
* after SIG_IGN or SIG_DFL signal it will restart
|
|
* (thus the name "restart only if has no handler").
|
|
*/
|
|
tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
|
|
break;
|
|
case ERESTART_RESTARTBLOCK:
|
|
/* Syscalls like nanosleep(), poll() which can't be
|
|
* restarted with their original arguments use this
|
|
* code. Kernel will execute restart_syscall() instead,
|
|
* which changes arguments before restarting syscall.
|
|
* SA_RESTART is ignored (assumed not set) similarly
|
|
* to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
|
|
* since restart data is saved in "restart block"
|
|
* in task struct, and if signal handler uses a syscall
|
|
* which in turn saves another such restart block,
|
|
* old data is lost and restart becomes impossible)
|
|
*/
|
|
tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
|
|
break;
|
|
default:
|
|
u_error_str = err_name(u_error);
|
|
if (u_error_str)
|
|
tprintf("= -1 %s (%s)",
|
|
u_error_str, strerror(u_error));
|
|
else
|
|
tprintf("= -1 %lu (%s)",
|
|
u_error, strerror(u_error));
|
|
break;
|
|
}
|
|
if (syscall_tampered(tcp))
|
|
tprintf(" (INJECTED)");
|
|
if ((sys_res & RVAL_STR) && tcp->auxstr)
|
|
tprintf(" (%s)", tcp->auxstr);
|
|
}
|
|
else {
|
|
if (sys_res & RVAL_NONE)
|
|
tprints("= ?");
|
|
else {
|
|
switch (sys_res & RVAL_MASK) {
|
|
case RVAL_HEX:
|
|
#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
|
|
if (current_wordsize < sizeof(tcp->u_rval)) {
|
|
tprintf("= %#x",
|
|
(unsigned int) tcp->u_rval);
|
|
} else
|
|
#endif
|
|
{
|
|
tprintf("= %#" PRI_klx, tcp->u_rval);
|
|
}
|
|
break;
|
|
case RVAL_OCTAL:
|
|
tprints("= ");
|
|
print_numeric_long_umask(tcp->u_rval);
|
|
break;
|
|
case RVAL_UDECIMAL:
|
|
#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
|
|
if (current_wordsize < sizeof(tcp->u_rval)) {
|
|
tprintf("= %u",
|
|
(unsigned int) tcp->u_rval);
|
|
} else
|
|
#endif
|
|
{
|
|
tprintf("= %" PRI_klu, tcp->u_rval);
|
|
}
|
|
break;
|
|
case RVAL_DECIMAL:
|
|
tprintf("= %" PRI_kld, tcp->u_rval);
|
|
break;
|
|
case RVAL_FD:
|
|
if (show_fd_path) {
|
|
tprints("= ");
|
|
printfd(tcp, tcp->u_rval);
|
|
}
|
|
else
|
|
tprintf("= %" PRI_kld, tcp->u_rval);
|
|
break;
|
|
default:
|
|
error_msg("invalid rval format");
|
|
break;
|
|
}
|
|
}
|
|
if ((sys_res & RVAL_STR) && tcp->auxstr)
|
|
tprintf(" (%s)", tcp->auxstr);
|
|
if (syscall_tampered(tcp))
|
|
tprints(" (INJECTED)");
|
|
}
|
|
if (Tflag) {
|
|
tv_sub(&tv, &tv, &tcp->etime);
|
|
tprintf(" <%ld.%06ld>",
|
|
(long) tv.tv_sec, (long) tv.tv_usec);
|
|
}
|
|
tprints("\n");
|
|
dumpio(tcp);
|
|
line_ended();
|
|
|
|
#ifdef USE_LIBUNWIND
|
|
if (stack_trace_enabled)
|
|
unwind_print_stacktrace(tcp);
|
|
#endif
|
|
|
|
ret:
|
|
tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
|
|
tcp->sys_func_rval = 0;
|
|
free_tcb_priv_data(tcp);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
trace_syscall(struct tcb *tcp, unsigned int *signo)
|
|
{
|
|
return exiting(tcp) ?
|
|
trace_syscall_exiting(tcp) : trace_syscall_entering(tcp, signo);
|
|
}
|
|
|
|
bool
|
|
is_erestart(struct tcb *tcp)
|
|
{
|
|
switch (tcp->u_error) {
|
|
case ERESTARTSYS:
|
|
case ERESTARTNOINTR:
|
|
case ERESTARTNOHAND:
|
|
case ERESTART_RESTARTBLOCK:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static unsigned long saved_u_error;
|
|
|
|
void
|
|
temporarily_clear_syserror(struct tcb *tcp)
|
|
{
|
|
saved_u_error = tcp->u_error;
|
|
tcp->u_error = 0;
|
|
}
|
|
|
|
void
|
|
restore_cleared_syserror(struct tcb *tcp)
|
|
{
|
|
tcp->u_error = saved_u_error;
|
|
}
|
|
|
|
/*
|
|
* Check the syscall return value register value for whether it is
|
|
* a negated errno code indicating an error, or a success return value.
|
|
*/
|
|
static inline bool
|
|
is_negated_errno(kernel_ulong_t val)
|
|
{
|
|
/* Linux kernel defines MAX_ERRNO to 4095. */
|
|
kernel_ulong_t max = -(kernel_long_t) 4095;
|
|
|
|
#ifndef current_klongsize
|
|
if (current_klongsize < sizeof(val)) {
|
|
val = (uint32_t) val;
|
|
max = (uint32_t) max;
|
|
}
|
|
#endif /* !current_klongsize */
|
|
|
|
return val >= max;
|
|
}
|
|
|
|
#include "arch_regs.c"
|
|
|
|
#ifdef HAVE_GETRVAL2
|
|
# include "arch_getrval2.c"
|
|
#endif
|
|
|
|
void
|
|
print_pc(struct tcb *tcp)
|
|
{
|
|
#if defined ARCH_PC_REG
|
|
# define ARCH_GET_PC 0
|
|
#elif defined ARCH_PC_PEEK_ADDR
|
|
kernel_ulong_t pc;
|
|
# define ARCH_PC_REG pc
|
|
# define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
|
|
#else
|
|
# error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
|
|
#endif
|
|
if (get_regs_error || ARCH_GET_PC)
|
|
tprints(current_wordsize == 4 ? "[????????] "
|
|
: "[????????????????] ");
|
|
else
|
|
tprintf(current_wordsize == 4
|
|
? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
|
|
(kernel_ulong_t) ARCH_PC_REG);
|
|
}
|
|
|
|
#include "getregs_old.h"
|
|
|
|
#undef ptrace_getregset_or_getregs
|
|
#undef ptrace_setregset_or_setregs
|
|
#ifdef ARCH_REGS_FOR_GETREGSET
|
|
|
|
# define ptrace_getregset_or_getregs ptrace_getregset
|
|
static long
|
|
ptrace_getregset(pid_t pid)
|
|
{
|
|
# ifdef ARCH_IOVEC_FOR_GETREGSET
|
|
/* variable iovec */
|
|
ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
|
|
return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
|
|
&ARCH_IOVEC_FOR_GETREGSET);
|
|
# else
|
|
/* constant iovec */
|
|
static struct iovec io = {
|
|
.iov_base = &ARCH_REGS_FOR_GETREGSET,
|
|
.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
|
|
};
|
|
return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
|
|
|
|
# endif
|
|
}
|
|
|
|
# ifndef HAVE_GETREGS_OLD
|
|
# define ptrace_setregset_or_setregs ptrace_setregset
|
|
static int
|
|
ptrace_setregset(pid_t pid)
|
|
{
|
|
# ifdef ARCH_IOVEC_FOR_GETREGSET
|
|
/* variable iovec */
|
|
return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
|
|
&ARCH_IOVEC_FOR_GETREGSET);
|
|
# else
|
|
/* constant iovec */
|
|
static struct iovec io = {
|
|
.iov_base = &ARCH_REGS_FOR_GETREGSET,
|
|
.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
|
|
};
|
|
return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
|
|
# endif
|
|
}
|
|
# endif /* !HAVE_GETREGS_OLD */
|
|
|
|
#elif defined ARCH_REGS_FOR_GETREGS
|
|
|
|
# define ptrace_getregset_or_getregs ptrace_getregs
|
|
static long
|
|
ptrace_getregs(pid_t pid)
|
|
{
|
|
# if defined SPARC || defined SPARC64
|
|
/* SPARC systems have the meaning of data and addr reversed */
|
|
return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
|
|
# else
|
|
return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
|
|
# endif
|
|
}
|
|
|
|
# ifndef HAVE_GETREGS_OLD
|
|
# define ptrace_setregset_or_setregs ptrace_setregs
|
|
static int
|
|
ptrace_setregs(pid_t pid)
|
|
{
|
|
# if defined SPARC || defined SPARC64
|
|
/* SPARC systems have the meaning of data and addr reversed */
|
|
return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
|
|
# else
|
|
return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
|
|
# endif
|
|
}
|
|
# endif /* !HAVE_GETREGS_OLD */
|
|
|
|
#endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
|
|
|
|
void
|
|
get_regs(pid_t pid)
|
|
{
|
|
#undef USE_GET_SYSCALL_RESULT_REGS
|
|
#ifdef ptrace_getregset_or_getregs
|
|
|
|
# ifdef HAVE_GETREGS_OLD
|
|
/*
|
|
* Try PTRACE_GETREGSET/PTRACE_GETREGS first,
|
|
* fallback to getregs_old.
|
|
*/
|
|
static int use_getregs_old;
|
|
if (use_getregs_old < 0) {
|
|
get_regs_error = ptrace_getregset_or_getregs(pid);
|
|
return;
|
|
} else if (use_getregs_old == 0) {
|
|
get_regs_error = ptrace_getregset_or_getregs(pid);
|
|
if (get_regs_error >= 0) {
|
|
use_getregs_old = -1;
|
|
return;
|
|
}
|
|
if (errno == EPERM || errno == ESRCH)
|
|
return;
|
|
use_getregs_old = 1;
|
|
}
|
|
get_regs_error = getregs_old(pid);
|
|
# else /* !HAVE_GETREGS_OLD */
|
|
/* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
|
|
get_regs_error = ptrace_getregset_or_getregs(pid);
|
|
# endif /* !HAVE_GETREGS_OLD */
|
|
|
|
#else /* !ptrace_getregset_or_getregs */
|
|
|
|
# define USE_GET_SYSCALL_RESULT_REGS 1
|
|
# warning get_regs is not implemented for this architecture yet
|
|
get_regs_error = 0;
|
|
|
|
#endif /* !ptrace_getregset_or_getregs */
|
|
}
|
|
|
|
#ifdef ptrace_setregset_or_setregs
|
|
static int
|
|
set_regs(pid_t pid)
|
|
{
|
|
return ptrace_setregset_or_setregs(pid);
|
|
}
|
|
#endif /* ptrace_setregset_or_setregs */
|
|
|
|
struct sysent_buf {
|
|
struct tcb *tcp;
|
|
struct_sysent ent;
|
|
char buf[sizeof("syscall_%lu") + sizeof(kernel_ulong_t) * 3];
|
|
};
|
|
|
|
static void
|
|
free_sysent_buf(void *ptr)
|
|
{
|
|
struct sysent_buf *s = ptr;
|
|
s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
|
|
free(ptr);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
|
|
* 1: ok, continue in trace_syscall_entering().
|
|
* other: error, trace_syscall_entering() should print error indicator
|
|
* ("????" etc) and bail out.
|
|
*/
|
|
int
|
|
get_scno(struct tcb *tcp)
|
|
{
|
|
if (get_regs_error)
|
|
return -1;
|
|
|
|
int rc = arch_get_scno(tcp);
|
|
if (rc != 1)
|
|
return rc;
|
|
|
|
if (scno_is_valid(tcp->scno)) {
|
|
tcp->s_ent = &sysent[tcp->scno];
|
|
tcp->qual_flg = qual_flags(tcp->scno);
|
|
} else {
|
|
struct sysent_buf *s = xcalloc(1, sizeof(*s));
|
|
|
|
s->tcp = tcp;
|
|
s->ent.nargs = MAX_ARGS;
|
|
s->ent.sen = SEN_printargs;
|
|
s->ent.sys_func = printargs;
|
|
s->ent.sys_name = s->buf;
|
|
sprintf(s->buf, "syscall_%" PRI_klu, shuffle_scno(tcp->scno));
|
|
|
|
tcp->s_ent = &s->ent;
|
|
tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
|
|
|
|
set_tcb_priv_data(tcp, s, free_sysent_buf);
|
|
|
|
if (debug_flag)
|
|
error_msg("pid %d invalid syscall %" PRI_kld,
|
|
tcp->pid, tcp->scno);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#ifdef USE_GET_SYSCALL_RESULT_REGS
|
|
static int get_syscall_result_regs(struct tcb *);
|
|
#endif
|
|
|
|
/* Returns:
|
|
* 1: ok, continue in trace_syscall_exiting().
|
|
* -1: error, trace_syscall_exiting() should print error indicator
|
|
* ("????" etc) and bail out.
|
|
*/
|
|
static int
|
|
get_syscall_result(struct tcb *tcp)
|
|
{
|
|
#ifdef USE_GET_SYSCALL_RESULT_REGS
|
|
if (get_syscall_result_regs(tcp))
|
|
return -1;
|
|
#endif
|
|
tcp->u_error = 0;
|
|
get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
|
|
|
|
return 1;
|
|
}
|
|
|
|
#include "get_scno.c"
|
|
#include "set_scno.c"
|
|
#include "get_syscall_args.c"
|
|
#ifdef USE_GET_SYSCALL_RESULT_REGS
|
|
# include "get_syscall_result.c"
|
|
#endif
|
|
#include "get_error.c"
|
|
#include "set_error.c"
|
|
#ifdef HAVE_GETREGS_OLD
|
|
# include "getregs_old.c"
|
|
#endif
|
|
|
|
const char *
|
|
syscall_name(kernel_ulong_t scno)
|
|
{
|
|
#if defined X32_PERSONALITY_NUMBER && defined __X32_SYSCALL_BIT
|
|
if (current_personality == X32_PERSONALITY_NUMBER)
|
|
scno &= ~__X32_SYSCALL_BIT;
|
|
#endif
|
|
return scno_is_valid(scno) ? sysent[scno].sys_name: NULL;
|
|
}
|