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ef1013795c
strace/prctl.c
Dmitry V. Levin 92d7499fbf Treat RVAL_DECIMAL the same way as RVAL_UDECIMAL 
Assuming that syscalls may return negative values only as error codes,
always print non-error syscall return codes as unsigned.

* defs.h (RVAL_UDECIMAL): Remove.
(RVAL_DECIMAL): Rename to RVAL_UDECIMAL.
* syscall.c (syscall_exiting_trace) <case RVAL_DECIMAL>: Remove.
* clone.c (SYS_FUNC(fork)): Remove RVAL_UDECIMAL.
* lseek.c (SYS_FUNC(lseek)): Likewise.
* prctl.c (SYS_FUNC(prctl)): Likewise.
* uid.c (SYS_FUNC(getuid), SYS_FUNC(setfsuid)): Likewise.
* times.c (SYS_FUNC(times)): Always return 0.
* tests/inject-nf.c (main): Update expected output.
2018-03-29 16:00:18 +00:00

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/*
* 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>
* Copyright (c) 2014-2017 The strace developers.
* 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 <linux/prctl.h>
#include "xstring.h"
#include "xlat/prctl_options.h"
#include "xlat/pr_cap_ambient.h"
#include "xlat/pr_dumpable.h"
#include "xlat/pr_fp_mode.h"
#include "xlat/pr_mce_kill.h"
#include "xlat/pr_mce_kill_policy.h"
#include "xlat/pr_set_mm.h"
#include "xlat/pr_sve_vl_flags.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"
#ifndef PR_SVE_VL_LEN_MASK
# define PR_SVE_VL_LEN_MASK 0xffff
#endif
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(", %#" PRI_klx, tcp->u_arg[i]);
}
static char *
sprint_sve_val(kernel_ulong_t arg)
{
static char out[sizeof("PR_SVE_SET_VL_ONEXEC|PR_SVE_VL_INHERIT|0x") +
sizeof(kernel_ulong_t) * 2];
kernel_ulong_t vl = arg & PR_SVE_VL_LEN_MASK;
kernel_ulong_t flags = arg & ~PR_SVE_VL_LEN_MASK;
const char *flags_str = sprintflags("", pr_sve_vl_flags, flags);
xsprintf(out, "%s%s%#" PRI_klx,
flags_str ?: "", flags_str ? "|" : "", vl);
return out;
}
SYS_FUNC(prctl)
{
const unsigned int option = tcp->u_arg[0];
const kernel_ulong_t arg2 = tcp->u_arg[1];
const kernel_ulong_t arg3 = tcp->u_arg[2];
/*
* PR_SET_VMA is the only command which actually uses these arguments
* currently, and it is available only on Android for now.
*/
#ifdef __ANDROID__
const kernel_ulong_t arg4 = tcp->u_arg[3];
const kernel_ulong_t arg5 = tcp->u_arg[4];
#endif
unsigned int i;
if (entering(tcp))
printxval(prctl_options, option, "PR_???");
switch (option) {
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, arg2, "%u");
break;
case PR_GET_DUMPABLE:
if (entering(tcp))
break;
if (syserror(tcp))
return 0;
tcp->auxstr = xlookup(pr_dumpable, (kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
case PR_GET_NAME:
if (entering(tcp)) {
tprints(", ");
} else {
if (syserror(tcp))
printaddr(arg2);
else
printstr_ex(tcp, arg2, TASK_COMM_LEN,
QUOTE_0_TERMINATED);
}
break;
case PR_GET_PDEATHSIG:
if (entering(tcp)) {
tprints(", ");
} else if (!umove_or_printaddr(tcp, arg2, &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,
(kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
case PR_GET_TID_ADDRESS:
if (entering(tcp))
tprints(", ");
else
printnum_kptr(tcp, arg2);
break;
case PR_GET_TSC:
if (entering(tcp)) {
tprints(", ");
} else if (!umove_or_printaddr(tcp, arg2, &i)) {
tprints("[");
printxval(pr_tsc, i, "PR_TSC_???");
tprints("]");
}
break;
case PR_GET_UNALIGN:
if (entering(tcp)) {
tprints(", ");
} else if (!umove_or_printaddr(tcp, arg2, &i)) {
tprints("[");
printflags(pr_unalign_flags, i, "PR_UNALIGN_???");
tprints("]");
}
break;
case PR_GET_FP_MODE:
if (entering(tcp))
break;
if (syserror(tcp) || tcp->u_rval == 0)
return 0;
tcp->auxstr = sprintflags("", pr_fp_mode,
(kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
case PR_SVE_SET_VL:
if (entering(tcp)) {
tprintf(", %s", sprint_sve_val(arg2));
return 0;
}
ATTRIBUTE_FALLTHROUGH;
case PR_SVE_GET_VL:
if (entering(tcp))
break;
if (syserror(tcp) || tcp->u_rval == 0)
return 0;
tcp->auxstr = sprint_sve_val(tcp->u_rval);
return RVAL_STR;
/* 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_ENDIAN:
case PR_SET_FPEMU:
case PR_SET_FPEXC:
case PR_SET_KEEPCAPS:
case PR_SET_TIMING:
tprintf(", %" PRI_klu, arg2);
return RVAL_DECODED;
case PR_SET_DUMPABLE:
tprints(", ");
printxval64(pr_dumpable, arg2, "SUID_DUMP_???");
return RVAL_DECODED;
case PR_CAPBSET_DROP:
case PR_CAPBSET_READ:
tprints(", ");
printxval64(cap, arg2, "CAP_???");
return RVAL_DECODED;
case PR_CAP_AMBIENT:
tprints(", ");
printxval64(pr_cap_ambient, arg2,
"PR_CAP_AMBIENT_???");
switch (arg2) {
case PR_CAP_AMBIENT_RAISE:
case PR_CAP_AMBIENT_LOWER:
case PR_CAP_AMBIENT_IS_SET:
tprints(", ");
printxval64(cap, arg3, "CAP_???");
print_prctl_args(tcp, 3);
break;
default:
print_prctl_args(tcp, 2);
break;
}
return RVAL_DECODED;
case PR_MCE_KILL:
tprints(", ");
printxval64(pr_mce_kill, arg2, "PR_MCE_KILL_???");
tprints(", ");
if (PR_MCE_KILL_SET == arg2)
printxval64(pr_mce_kill_policy, arg3,
"PR_MCE_KILL_???");
else
tprintf("%#" PRI_klx, arg3);
print_prctl_args(tcp, 3);
return RVAL_DECODED;
case PR_SET_NAME:
tprints(", ");
printstr_ex(tcp, arg2, TASK_COMM_LEN - 1,
QUOTE_0_TERMINATED);
return RVAL_DECODED;
#ifdef __ANDROID__
# ifndef PR_SET_VMA_ANON_NAME
# define PR_SET_VMA_ANON_NAME 0
# endif
case PR_SET_VMA:
if (arg2 == PR_SET_VMA_ANON_NAME) {
tprintf(", PR_SET_VMA_ANON_NAME, %#" PRI_klx, arg3);
tprintf(", %" PRI_klu ", ", arg4);
printstr(tcp, arg5);
} 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, arg2, "PR_SET_MM_???");
print_prctl_args(tcp, 2);
return RVAL_DECODED;
case PR_SET_PDEATHSIG:
tprints(", ");
if (arg2 > 128)
tprintf("%" PRI_klu, arg2);
else
tprints(signame(arg2));
return RVAL_DECODED;
case PR_SET_PTRACER:
tprints(", ");
if ((int) arg2 == -1)
tprints("PR_SET_PTRACER_ANY");
else
tprintf("%" PRI_klu, arg2);
return RVAL_DECODED;
case PR_SET_SECCOMP:
tprints(", ");
printxval64(seccomp_mode, arg2,
"SECCOMP_MODE_???");
if (SECCOMP_MODE_STRICT == arg2)
return RVAL_DECODED;
if (SECCOMP_MODE_FILTER == arg2) {
tprints(", ");
decode_seccomp_fprog(tcp, arg3);
return RVAL_DECODED;
}
print_prctl_args(tcp, 2);
return RVAL_DECODED;
case PR_SET_SECUREBITS:
tprints(", ");
printflags64(secbits, arg2, "SECBIT_???");
return RVAL_DECODED;
case PR_SET_TIMERSLACK:
tprintf(", %" PRI_kld, arg2);
return RVAL_DECODED;
case PR_SET_TSC:
tprints(", ");
printxval(pr_tsc, arg2, "PR_TSC_???");
return RVAL_DECODED;
case PR_SET_UNALIGN:
tprints(", ");
printflags(pr_unalign_flags, arg2, "PR_UNALIGN_???");
return RVAL_DECODED;
case PR_SET_NO_NEW_PRIVS:
case PR_SET_THP_DISABLE:
tprintf(", %" PRI_klu, arg2);
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,
(kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
case PR_SET_FP_MODE:
tprints(", ");
printflags(pr_fp_mode, arg2, "PR_FP_MODE_???");
return RVAL_DECODED;
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 || defined I386
# include "xlat/archvals.h"
SYS_FUNC(arch_prctl)
{
const unsigned int option = tcp->u_arg[0];
const kernel_ulong_t addr = tcp->u_arg[1];
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, addr);
return 0;
}
tprintf(", %#" PRI_klx, addr);
return RVAL_DECODED;
}
#endif /* X86_64 || X32 || I386 */
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