prctl.c - platform/external/strace - Git at Google

 /*
  * Copyright (c) 1994-1996 Rick Sladkey <jrs@world.std.com>
  * Copyright (c) 1996-2000 Wichert Akkerman <wichert@cistron.nl>
  * Copyright (c) 2005-2007 Roland McGrath <roland@redhat.com>
  * Copyright (c) 2008-2015 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 "defs.h"

 #include <sys/prctl.h>

 #include "xlat/prctl_options.h"
 #include "xlat/pr_cap_ambient.h"
 #include "xlat/pr_mce_kill.h"
 #include "xlat/pr_mce_kill_policy.h"
 #include "xlat/pr_set_mm.h"
 #include "xlat/pr_tsc.h"
 #include "xlat/pr_unalign_flags.h"

 #ifndef TASK_COMM_LEN
 # define TASK_COMM_LEN 16
 #endif

 #ifdef HAVE_LINUX_SECCOMP_H
 # include <linux/seccomp.h>
 #endif
 #include "xlat/seccomp_mode.h"

 #ifdef HAVE_LINUX_SECUREBITS_H
 # include <linux/securebits.h>
 #endif
 #include "xlat/secbits.h"

 /* these constants are the same as in <linux/capability.h> */
 enum {
 #include "caps0.h"
 #include "caps1.h"
 };

 #include "xlat/cap.h"

 static void
 print_prctl_args(struct tcb *tcp, const unsigned int first)
 {
 	unsigned int i;

 	for (i = first; i < tcp->s_ent->nargs; ++i)
 		tprintf(", %#lx", tcp->u_arg[i]);
 }

 SYS_FUNC(prctl)
 {
 	const unsigned int option = tcp->u_arg[0];
 	unsigned int i;

 	if (entering(tcp))
 		printxval(prctl_options, option, "PR_???");

 	switch (option) {
 	case PR_GET_DUMPABLE:
 	case PR_GET_KEEPCAPS:
 	case PR_GET_SECCOMP:
 	case PR_GET_TIMERSLACK:
 	case PR_GET_TIMING:
 		return RVAL_DECODED;

 	case PR_GET_CHILD_SUBREAPER:
 	case PR_GET_ENDIAN:
 	case PR_GET_FPEMU:
 	case PR_GET_FPEXC:
 		if (entering(tcp))
 			tprints(", ");
 		else
 			printnum_int(tcp, tcp->u_arg[1], "%u");
 		break;

 	case PR_GET_NAME:
 		if (entering(tcp))
 			tprints(", ");
 		else {
 			if (syserror(tcp))
 				printaddr(tcp->u_arg[1]);
 			else
 				printstr(tcp, tcp->u_arg[1], -1);
 		}
 		break;

 	case PR_GET_PDEATHSIG:
 		if (entering(tcp))
 			tprints(", ");
 		else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
 			tprints("[");
 			tprints(signame(i));
 			tprints("]");
 		}
 		break;

 	case PR_GET_SECUREBITS:
 		if (entering(tcp))
 			break;
 		if (syserror(tcp) || tcp->u_rval == 0)
 			return 0;
 		tcp->auxstr = sprintflags("", secbits,
 					  (unsigned long) tcp->u_rval);
 		return RVAL_STR;

 	case PR_GET_TID_ADDRESS:
 		if (entering(tcp))
 			tprints(", ");
 		else
 			printnum_ptr(tcp, tcp->u_arg[1]);
 		break;

 	case PR_GET_TSC:
 		if (entering(tcp))
 			tprints(", ");
 		else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
 			tprints("[");
 			printxval(pr_tsc, i, "PR_TSC_???");
 			tprints("]");
 		}
 		break;

 	case PR_GET_UNALIGN:
 		if (entering(tcp))
 			tprints(", ");
 		else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
 			tprints("[");
 			printflags(pr_unalign_flags, i, "PR_UNALIGN_???");
 			tprints("]");
 		}
 		break;

 	/* PR_TASK_PERF_EVENTS_* take no arguments. */
 	case PR_TASK_PERF_EVENTS_DISABLE:
 	case PR_TASK_PERF_EVENTS_ENABLE:
 		return RVAL_DECODED;

 	case PR_SET_CHILD_SUBREAPER:
 	case PR_SET_DUMPABLE:
 	case PR_SET_ENDIAN:
 	case PR_SET_FPEMU:
 	case PR_SET_FPEXC:
 	case PR_SET_KEEPCAPS:
 	case PR_SET_TIMING:
 		tprintf(", %lu", tcp->u_arg[1]);
 		return RVAL_DECODED;

 	case PR_CAPBSET_DROP:
 	case PR_CAPBSET_READ:
 		tprints(", ");
 		printxval(cap, tcp->u_arg[1], "CAP_???");
 		return RVAL_DECODED;

 	case PR_CAP_AMBIENT:
 		tprints(", ");
 		printxval(pr_cap_ambient, tcp->u_arg[1], "PR_CAP_AMBIENT_???");
 		switch (tcp->u_arg[1]) {
 		case PR_CAP_AMBIENT_RAISE:
 		case PR_CAP_AMBIENT_LOWER:
 		case PR_CAP_AMBIENT_IS_SET:
 			tprints(", ");
 			printxval(cap, tcp->u_arg[2], "CAP_???");
 			print_prctl_args(tcp, 3);
 			break;
 		default:
 			print_prctl_args(tcp, 2);
 			break;
 		}
 		return RVAL_DECODED;

 	case PR_MCE_KILL:
 		tprints(", ");
 		printxval(pr_mce_kill, tcp->u_arg[1], "PR_MCE_KILL_???");
 		tprints(", ");
 		if (PR_MCE_KILL_SET == tcp->u_arg[1])
 			printxval(pr_mce_kill_policy, tcp->u_arg[2],
 				   "PR_MCE_KILL_???");
 		else
 			tprintf("%#lx", tcp->u_arg[2]);
 		print_prctl_args(tcp, 3);
 		return RVAL_DECODED;

 	case PR_SET_NAME:
 		tprints(", ");
 		printstr(tcp, tcp->u_arg[1], TASK_COMM_LEN);
 		return RVAL_DECODED;

 #ifdef __ANDROID__
 # ifndef PR_SET_VMA_ANON_NAME
 #  define PR_SET_VMA_ANON_NAME    0
 # endif
 	case PR_SET_VMA:
 		if (tcp->u_arg[1] == PR_SET_VMA_ANON_NAME) {
 			tprintf(", PR_SET_VMA_ANON_NAME, %#lx", tcp->u_arg[2]);
 			tprintf(", %lu, ", tcp->u_arg[3]);
 			printstr(tcp, tcp->u_arg[4], -1);
 		} else {
 			/* There are no other sub-options now, but there
 			 * might be in future... */
 			print_prctl_args(tcp, 1);
 		}
 		return RVAL_DECODED;
 #endif

 	case PR_SET_MM:
 		tprints(", ");
 		printxval(pr_set_mm, tcp->u_arg[1], "PR_SET_MM_???");
 		print_prctl_args(tcp, 2);
 		return RVAL_DECODED;

 	case PR_SET_PDEATHSIG:
 		tprints(", ");
 		if ((unsigned long) tcp->u_arg[1] > 128)
 			tprintf("%lu", tcp->u_arg[1]);
 		else
 			tprints(signame(tcp->u_arg[1]));
 		return RVAL_DECODED;

 	case PR_SET_PTRACER:
 		tprints(", ");
 		if (tcp->u_arg[1] == -1)
 			tprints("PR_SET_PTRACER_ANY");
 		else
 			tprintf("%lu", tcp->u_arg[1]);
 		return RVAL_DECODED;

 	case PR_SET_SECCOMP:
 		tprints(", ");
 		printxval(seccomp_mode, tcp->u_arg[1],
 			  "SECCOMP_MODE_???");
 		if (SECCOMP_MODE_STRICT == tcp->u_arg[1])
 			return RVAL_DECODED;
 		if (SECCOMP_MODE_FILTER == tcp->u_arg[1]) {
 			tprints(", ");
 			print_seccomp_filter(tcp, tcp->u_arg[2]);
 			return RVAL_DECODED;
 		}
 		print_prctl_args(tcp, 2);
 		return RVAL_DECODED;

 	case PR_SET_SECUREBITS:
 		tprints(", ");
 		printflags(secbits, tcp->u_arg[1], "SECBIT_???");
 		return RVAL_DECODED;

 	case PR_SET_TIMERSLACK:
 		tprintf(", %ld", tcp->u_arg[1]);
 		return RVAL_DECODED;

 	case PR_SET_TSC:
 		tprints(", ");
 		printxval(pr_tsc, tcp->u_arg[1], "PR_TSC_???");
 		return RVAL_DECODED;

 	case PR_SET_UNALIGN:
 		tprints(", ");
 		printflags(pr_unalign_flags, tcp->u_arg[1], "PR_UNALIGN_???");
 		return RVAL_DECODED;

 	case PR_SET_NO_NEW_PRIVS:
 	case PR_SET_THP_DISABLE:
 		tprintf(", %lu", tcp->u_arg[1]);
 		print_prctl_args(tcp, 2);
 		return RVAL_DECODED;

 	case PR_MCE_KILL_GET:
 		if (entering(tcp)) {
 			print_prctl_args(tcp, 1);
 			return 0;
 		}
 		if (syserror(tcp))
 			return 0;
 		tcp->auxstr = xlookup(pr_mce_kill_policy,
 				      (unsigned long) tcp->u_rval);
 		return tcp->auxstr ? RVAL_STR : RVAL_UDECIMAL;

 	case PR_GET_NO_NEW_PRIVS:
 	case PR_GET_THP_DISABLE:
 	case PR_MPX_DISABLE_MANAGEMENT:
 	case PR_MPX_ENABLE_MANAGEMENT:
 	default:
 		print_prctl_args(tcp, 1);
 		return RVAL_DECODED;
 	}
 	return 0;
 }

 #if defined X86_64 || defined X32
 # include <asm/prctl.h>
 # include "xlat/archvals.h"

 SYS_FUNC(arch_prctl)
 {
 	const unsigned int option = tcp->u_arg[0];

 	if (entering(tcp))
 		printxval(archvals, option, "ARCH_???");

 	switch (option) {
 	case ARCH_GET_GS:
 	case ARCH_GET_FS:
 		if (entering(tcp))
 			tprints(", ");
 		else
 			printnum_ptr(tcp, tcp->u_arg[1]);
 		return 0;
 	}

 	tprintf(", %#lx", tcp->u_arg[1]);
 	return RVAL_DECODED;
 }
 #endif /* X86_64 || X32 */
	/*
	* Copyright (c) 1994-1996 Rick Sladkey <jrs@world.std.com>
	* Copyright (c) 1996-2000 Wichert Akkerman <wichert@cistron.nl>
	* Copyright (c) 2005-2007 Roland McGrath <roland@redhat.com>
	* Copyright (c) 2008-2015 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 "defs.h"

	#include <sys/prctl.h>

	#include "xlat/prctl_options.h"
	#include "xlat/pr_cap_ambient.h"
	#include "xlat/pr_mce_kill.h"
	#include "xlat/pr_mce_kill_policy.h"
	#include "xlat/pr_set_mm.h"
	#include "xlat/pr_tsc.h"
	#include "xlat/pr_unalign_flags.h"

	#ifndef TASK_COMM_LEN
	# define TASK_COMM_LEN 16
	#endif

	#ifdef HAVE_LINUX_SECCOMP_H
	# include <linux/seccomp.h>
	#endif
	#include "xlat/seccomp_mode.h"

	#ifdef HAVE_LINUX_SECUREBITS_H
	# include <linux/securebits.h>
	#endif
	#include "xlat/secbits.h"

	/* these constants are the same as in <linux/capability.h> */
	enum {
	#include "caps0.h"
	#include "caps1.h"
	};

	#include "xlat/cap.h"

	static void
	print_prctl_args(struct tcb *tcp, const unsigned int first)
	{
	unsigned int i;

	for (i = first; i < tcp->s_ent->nargs; ++i)
	tprintf(", %#lx", tcp->u_arg[i]);
	}

	SYS_FUNC(prctl)
	{
	const unsigned int option = tcp->u_arg[0];
	unsigned int i;

	if (entering(tcp))
	printxval(prctl_options, option, "PR_???");

	switch (option) {
	case PR_GET_DUMPABLE:
	case PR_GET_KEEPCAPS:
	case PR_GET_SECCOMP:
	case PR_GET_TIMERSLACK:
	case PR_GET_TIMING:
	return RVAL_DECODED;

	case PR_GET_CHILD_SUBREAPER:
	case PR_GET_ENDIAN:
	case PR_GET_FPEMU:
	case PR_GET_FPEXC:
	if (entering(tcp))
	tprints(", ");
	else
	printnum_int(tcp, tcp->u_arg[1], "%u");
	break;

	case PR_GET_NAME:
	if (entering(tcp))
	tprints(", ");
	else {
	if (syserror(tcp))
	printaddr(tcp->u_arg[1]);
	else
	printstr(tcp, tcp->u_arg[1], -1);
	}
	break;

	case PR_GET_PDEATHSIG:
	if (entering(tcp))
	tprints(", ");
	else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
	tprints("[");
	tprints(signame(i));
	tprints("]");
	}
	break;

	case PR_GET_SECUREBITS:
	if (entering(tcp))
	break;
	if (syserror(tcp) \|\| tcp->u_rval == 0)
	return 0;
	tcp->auxstr = sprintflags("", secbits,
	(unsigned long) tcp->u_rval);
	return RVAL_STR;

	case PR_GET_TID_ADDRESS:
	if (entering(tcp))
	tprints(", ");
	else
	printnum_ptr(tcp, tcp->u_arg[1]);
	break;

	case PR_GET_TSC:
	if (entering(tcp))
	tprints(", ");
	else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
	tprints("[");
	printxval(pr_tsc, i, "PR_TSC_???");
	tprints("]");
	}
	break;

	case PR_GET_UNALIGN:
	if (entering(tcp))
	tprints(", ");
	else if (!umove_or_printaddr(tcp, tcp->u_arg[1], &i)) {
	tprints("[");
	printflags(pr_unalign_flags, i, "PR_UNALIGN_???");
	tprints("]");
	}
	break;

	/* PR_TASK_PERF_EVENTS_* take no arguments. */
	case PR_TASK_PERF_EVENTS_DISABLE:
	case PR_TASK_PERF_EVENTS_ENABLE:
	return RVAL_DECODED;

	case PR_SET_CHILD_SUBREAPER:
	case PR_SET_DUMPABLE:
	case PR_SET_ENDIAN:
	case PR_SET_FPEMU:
	case PR_SET_FPEXC:
	case PR_SET_KEEPCAPS:
	case PR_SET_TIMING:
	tprintf(", %lu", tcp->u_arg[1]);
	return RVAL_DECODED;

	case PR_CAPBSET_DROP:
	case PR_CAPBSET_READ:
	tprints(", ");
	printxval(cap, tcp->u_arg[1], "CAP_???");
	return RVAL_DECODED;

	case PR_CAP_AMBIENT:
	tprints(", ");
	printxval(pr_cap_ambient, tcp->u_arg[1], "PR_CAP_AMBIENT_???");
	switch (tcp->u_arg[1]) {
	case PR_CAP_AMBIENT_RAISE:
	case PR_CAP_AMBIENT_LOWER:
	case PR_CAP_AMBIENT_IS_SET:
	tprints(", ");
	printxval(cap, tcp->u_arg[2], "CAP_???");
	print_prctl_args(tcp, 3);
	break;
	default:
	print_prctl_args(tcp, 2);
	break;
	}
	return RVAL_DECODED;

	case PR_MCE_KILL:
	tprints(", ");
	printxval(pr_mce_kill, tcp->u_arg[1], "PR_MCE_KILL_???");
	tprints(", ");
	if (PR_MCE_KILL_SET == tcp->u_arg[1])
	printxval(pr_mce_kill_policy, tcp->u_arg[2],
	"PR_MCE_KILL_???");
	else
	tprintf("%#lx", tcp->u_arg[2]);
	print_prctl_args(tcp, 3);
	return RVAL_DECODED;

	case PR_SET_NAME:
	tprints(", ");
	printstr(tcp, tcp->u_arg[1], TASK_COMM_LEN);
	return RVAL_DECODED;

	#ifdef __ANDROID__
	# ifndef PR_SET_VMA_ANON_NAME
	# define PR_SET_VMA_ANON_NAME 0
	# endif
	case PR_SET_VMA:
	if (tcp->u_arg[1] == PR_SET_VMA_ANON_NAME) {
	tprintf(", PR_SET_VMA_ANON_NAME, %#lx", tcp->u_arg[2]);
	tprintf(", %lu, ", tcp->u_arg[3]);
	printstr(tcp, tcp->u_arg[4], -1);
	} else {
	/* There are no other sub-options now, but there
	* might be in future... */
	print_prctl_args(tcp, 1);
	}
	return RVAL_DECODED;
	#endif

	case PR_SET_MM:
	tprints(", ");
	printxval(pr_set_mm, tcp->u_arg[1], "PR_SET_MM_???");
	print_prctl_args(tcp, 2);
	return RVAL_DECODED;

	case PR_SET_PDEATHSIG:
	tprints(", ");
	if ((unsigned long) tcp->u_arg[1] > 128)
	tprintf("%lu", tcp->u_arg[1]);
	else
	tprints(signame(tcp->u_arg[1]));
	return RVAL_DECODED;

	case PR_SET_PTRACER:
	tprints(", ");
	if (tcp->u_arg[1] == -1)
	tprints("PR_SET_PTRACER_ANY");
	else
	tprintf("%lu", tcp->u_arg[1]);
	return RVAL_DECODED;

	case PR_SET_SECCOMP:
	tprints(", ");
	printxval(seccomp_mode, tcp->u_arg[1],
	"SECCOMP_MODE_???");
	if (SECCOMP_MODE_STRICT == tcp->u_arg[1])
	return RVAL_DECODED;
	if (SECCOMP_MODE_FILTER == tcp->u_arg[1]) {
	tprints(", ");
	print_seccomp_filter(tcp, tcp->u_arg[2]);
	return RVAL_DECODED;
	}
	print_prctl_args(tcp, 2);
	return RVAL_DECODED;

	case PR_SET_SECUREBITS:
	tprints(", ");
	printflags(secbits, tcp->u_arg[1], "SECBIT_???");
	return RVAL_DECODED;

	case PR_SET_TIMERSLACK:
	tprintf(", %ld", tcp->u_arg[1]);
	return RVAL_DECODED;

	case PR_SET_TSC:
	tprints(", ");
	printxval(pr_tsc, tcp->u_arg[1], "PR_TSC_???");
	return RVAL_DECODED;

	case PR_SET_UNALIGN:
	tprints(", ");
	printflags(pr_unalign_flags, tcp->u_arg[1], "PR_UNALIGN_???");
	return RVAL_DECODED;

	case PR_SET_NO_NEW_PRIVS:
	case PR_SET_THP_DISABLE:
	tprintf(", %lu", tcp->u_arg[1]);
	print_prctl_args(tcp, 2);
	return RVAL_DECODED;

	case PR_MCE_KILL_GET:
	if (entering(tcp)) {
	print_prctl_args(tcp, 1);
	return 0;
	}
	if (syserror(tcp))
	return 0;
	tcp->auxstr = xlookup(pr_mce_kill_policy,
	(unsigned long) tcp->u_rval);
	return tcp->auxstr ? RVAL_STR : RVAL_UDECIMAL;

	case PR_GET_NO_NEW_PRIVS:
	case PR_GET_THP_DISABLE:
	case PR_MPX_DISABLE_MANAGEMENT:
	case PR_MPX_ENABLE_MANAGEMENT:
	default:
	print_prctl_args(tcp, 1);
	return RVAL_DECODED;
	}
	return 0;
	}

	#if defined X86_64 \|\| defined X32
	# include <asm/prctl.h>
	# include "xlat/archvals.h"

	SYS_FUNC(arch_prctl)
	{
	const unsigned int option = tcp->u_arg[0];

	if (entering(tcp))
	printxval(archvals, option, "ARCH_???");

	switch (option) {
	case ARCH_GET_GS:
	case ARCH_GET_FS:
	if (entering(tcp))
	tprints(", ");
	else
	printnum_ptr(tcp, tcp->u_arg[1]);
	return 0;
	}

	tprintf(", %#lx", tcp->u_arg[1]);
	return RVAL_DECODED;
	}
	#endif /* X86_64 \|\| X32 */