* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
+ * Copyright (c) 1999-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
*/
#include "defs.h"
+#include "mmap_notify.h"
#include "native_defs.h"
-#include <sys/param.h>
-#include <signal.h>
+#include "ptrace.h"
+#include "nsig.h"
+#include "number_set.h"
+#include "delay.h"
+#include "retval.h"
+#include <limits.h>
/* for struct iovec */
#include <sys/uio.h>
+/* for __X32_SYSCALL_BIT */
+#include <asm/unistd.h>
+
#include "regs.h"
-#include "ptrace.h"
#if defined(SPARC64)
# undef PTRACE_GETREGS
# define PTRACE_SETREGS PTRACE_SETREGS64
#endif
-#if defined SPARC64
-# include <asm/psrcompat.h>
-#elif defined SPARC
-# include <asm/psr.h>
-#endif
-
-#ifdef IA64
-# include <asm/rse.h>
-#endif
-
-#ifndef NT_PRSTATUS
-# define NT_PRSTATUS 1
-#endif
-
-#ifndef NSIG
-# warning: NSIG is not defined, using 32
-# define NSIG 32
-#endif
-
#include "syscall.h"
+#include "xstring.h"
/* Define these shorthand notations to simplify the syscallent files. */
-#define TD TRACE_DESC
-#define TF TRACE_FILE
-#define TI TRACE_IPC
-#define TN TRACE_NETWORK
-#define TP TRACE_PROCESS
-#define TS TRACE_SIGNAL
-#define TM TRACE_MEMORY
-#define NF SYSCALL_NEVER_FAILS
-#define MA MAX_ARGS
-#define SI STACKTRACE_INVALIDATE_CACHE
-#define SE STACKTRACE_CAPTURE_ON_ENTER
-#define CST COMPAT_SYSCALL_TYPES
+#include "sysent_shorthand_defs.h"
#define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
#endif
/* Now undef them since short defines cause wicked namespace pollution. */
-#undef SEN
-#undef TD
-#undef TF
-#undef TI
-#undef TN
-#undef TP
-#undef TS
-#undef TM
-#undef NF
-#undef MA
-#undef SI
-#undef SE
-#undef CST
+#include "sysent_shorthand_undefs.h"
+
+const char *const errnoent[] = {
+#include "errnoent.h"
+};
+const char *const signalent[] = {
+#include "signalent.h"
+};
/*
* `ioctlent[012].h' files are automatically generated by the auxiliary
* program `ioctlsort', such that the list is sorted by the `code' field.
* in "/usr/include".
*/
-const char *const errnoent0[] = {
-#include "errnoent.h"
-};
-const char *const signalent0[] = {
-#include "signalent.h"
-};
const struct_ioctlent ioctlent0[] = {
#include "ioctlent0.h"
};
#if SUPPORTED_PERSONALITIES > 1
-static const char *const errnoent1[] = {
-# include "errnoent1.h"
-};
-static const char *const signalent1[] = {
-# include "signalent1.h"
-};
static const struct_ioctlent ioctlent1[] = {
# include "ioctlent1.h"
};
#endif
#if SUPPORTED_PERSONALITIES > 2
-static const char *const errnoent2[] = {
-# include "errnoent2.h"
-};
-static const char *const signalent2[] = {
-# include "signalent2.h"
-};
static const struct_ioctlent ioctlent2[] = {
# include "ioctlent2.h"
};
#endif
};
-enum {
- nerrnos0 = ARRAY_SIZE(errnoent0)
-#if SUPPORTED_PERSONALITIES > 1
- , nerrnos1 = ARRAY_SIZE(errnoent1)
-# if SUPPORTED_PERSONALITIES > 2
- , nerrnos2 = ARRAY_SIZE(errnoent2)
-# endif
-#endif
-};
-
-enum {
- nsignals0 = ARRAY_SIZE(signalent0)
-#if SUPPORTED_PERSONALITIES > 1
- , nsignals1 = ARRAY_SIZE(signalent1)
-# if SUPPORTED_PERSONALITIES > 2
- , nsignals2 = ARRAY_SIZE(signalent2)
-# endif
-#endif
-};
-
enum {
nioctlents0 = ARRAY_SIZE(ioctlent0)
#if SUPPORTED_PERSONALITIES > 1
#if SUPPORTED_PERSONALITIES > 1
const struct_sysent *sysent = sysent0;
-const char *const *errnoent = errnoent0;
-const char *const *signalent = signalent0;
const struct_ioctlent *ioctlent = ioctlent0;
const struct_printers *printers = &printers0;
#endif
+const unsigned int nerrnos = ARRAY_SIZE(errnoent);
+const unsigned int nsignals = ARRAY_SIZE(signalent);
unsigned nsyscalls = nsyscalls0;
-unsigned nerrnos = nerrnos0;
-unsigned nsignals = nsignals0;
unsigned nioctlents = nioctlents0;
const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
#endif
};
+const char *const personality_names[] =
+# if defined X86_64
+ {"64 bit", "32 bit", "x32"}
+# elif defined X32
+ {"x32", "32 bit"}
+# elif SUPPORTED_PERSONALITIES == 2
+ {"64 bit", "32 bit"}
+# else
+ {STRINGIFY_VAL(__WORDSIZE) " bit"}
+# endif
+ ;
+
#if SUPPORTED_PERSONALITIES > 1
+
unsigned current_personality;
# ifndef current_wordsize
-unsigned current_wordsize;
+unsigned current_wordsize = PERSONALITY0_WORDSIZE;
static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
PERSONALITY0_WORDSIZE,
PERSONALITY1_WORDSIZE,
# endif
# ifndef current_klongsize
-unsigned current_klongsize;
+unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
PERSONALITY0_KLONGSIZE,
PERSONALITY1_KLONGSIZE,
# endif
void
-set_personality(int personality)
+set_personality(unsigned int personality)
{
+ if (personality == current_personality)
+ return;
+
+ if (personality >= SUPPORTED_PERSONALITIES)
+ error_msg_and_die("Requested switch to unsupported personality "
+ "%u", personality);
+
nsyscalls = nsyscall_vec[personality];
sysent = sysent_vec[personality];
switch (personality) {
case 0:
- errnoent = errnoent0;
- nerrnos = nerrnos0;
ioctlent = ioctlent0;
nioctlents = nioctlents0;
- signalent = signalent0;
- nsignals = nsignals0;
printers = &printers0;
break;
case 1:
- errnoent = errnoent1;
- nerrnos = nerrnos1;
ioctlent = ioctlent1;
nioctlents = nioctlents1;
- signalent = signalent1;
- nsignals = nsignals1;
printers = &printers1;
break;
# if SUPPORTED_PERSONALITIES > 2
case 2:
- errnoent = errnoent2;
- nerrnos = nerrnos2;
ioctlent = ioctlent2;
nioctlents = nioctlents2;
- signalent = signalent2;
- nsignals = nsignals2;
printers = &printers2;
break;
# endif
static void
update_personality(struct tcb *tcp, unsigned int personality)
{
- if (personality == current_personality)
- return;
+ static bool need_mpers_warning[] =
+ { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
+
set_personality(personality);
if (personality == tcp->currpers)
return;
tcp->currpers = personality;
-# undef PERSONALITY_NAMES
-# if defined POWERPC64
-# define PERSONALITY_NAMES {"64 bit", "32 bit"}
-# elif defined X86_64
-# define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
-# elif defined X32
-# define PERSONALITY_NAMES {"x32", "32 bit"}
-# elif defined AARCH64
-# define PERSONALITY_NAMES {"64 bit", "32 bit"}
-# elif defined TILE
-# define PERSONALITY_NAMES {"64-bit", "32-bit"}
-# endif
-# ifdef PERSONALITY_NAMES
if (!qflag) {
- static const char *const names[] = PERSONALITY_NAMES;
error_msg("[ Process PID=%d runs in %s mode. ]",
- tcp->pid, names[personality]);
+ tcp->pid, personality_names[personality]);
+ }
+
+ if (need_mpers_warning[personality]) {
+ error_msg("WARNING: Proper structure decoding for this "
+ "personality is not supported, please consider "
+ "building strace with mpers support enabled.");
+ need_mpers_warning[personality] = false;
}
-# endif
}
#endif
tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
? ((uint32_t *) (void *) buf)[i] : buf[i];
}
-#endif
+#endif /* SYS_socket_subcall */
#ifdef SYS_ipc_subcall
static void
for (i = 0; i < n; i++)
tcp->u_arg[i] = tcp->u_arg[i + 1];
}
-#endif
+#endif /* SYS_ipc_subcall */
-#ifdef LINUX_MIPSO32
+#ifdef SYS_syscall_subcall
static void
-decode_mips_subcall(struct tcb *tcp)
+decode_syscall_subcall(struct tcb *tcp)
{
if (!scno_is_valid(tcp->u_arg[0]))
return;
tcp->s_ent = &sysent[tcp->scno];
memmove(&tcp->u_arg[0], &tcp->u_arg[1],
sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
+# ifdef LINUX_MIPSO32
/*
* Fetching the last arg of 7-arg syscalls (fadvise64_64
* and sync_file_range) requires additional code,
&tcp->u_arg[MAX_ARGS - 1]) < 0)
tcp->u_arg[MAX_ARGS - 1] = 0;
}
+# endif /* LINUX_MIPSO32 */
}
-#endif /* LINUX_MIPSO32 */
+#endif /* SYS_syscall_subcall */
static void
dumpio(struct tcb *tcp)
{
- if (syserror(tcp))
- return;
-
int fd = tcp->u_arg[0];
if (fd < 0)
return;
- if (is_number_in_set(fd, &read_set)) {
- switch (tcp->s_ent->sen) {
- case SEN_read:
- case SEN_pread:
- case SEN_recv:
- case SEN_recvfrom:
- case SEN_mq_timedreceive:
- dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
- return;
- case SEN_readv:
- case SEN_preadv:
- case SEN_preadv2:
- dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
- tcp->u_rval);
- return;
- case SEN_recvmsg:
- dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
- return;
- case SEN_recvmmsg:
- dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
- return;
- }
- }
- if (is_number_in_set(fd, &write_set)) {
+ if (is_number_in_set(fd, write_set)) {
switch (tcp->s_ent->sen) {
case SEN_write:
case SEN_pwrite:
break;
}
}
-}
-
-/*
- * 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.
- */
-static kernel_ulong_t
-shuffle_scno(kernel_ulong_t scno)
-{
-#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
- if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
- 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;
+ if (syserror(tcp))
+ return;
-# 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;
+ if (is_number_in_set(fd, read_set)) {
+ switch (tcp->s_ent->sen) {
+ case SEN_read:
+ case SEN_pread:
+ case SEN_recv:
+ case SEN_recvfrom:
+ case SEN_mq_timedreceive:
+ dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
+ return;
+ case SEN_readv:
+ case SEN_preadv:
+ case SEN_preadv2:
+ dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
+ tcp->u_rval);
+ return;
+ case SEN_recvmsg:
+ dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
+ return;
+ case SEN_recvmmsg:
+ dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
+ return;
+ }
}
-#endif /* ARM || AARCH64 */
-
- return scno;
}
const char *
return NULL;
}
-static long get_regs_error;
-
-void
-clear_regs(void)
+static void
+print_err_ret(kernel_ulong_t ret, unsigned long u_error)
{
- get_regs_error = -1;
+ const char *u_error_str = err_name(u_error);
+
+ if (u_error_str)
+ tprintf("= %" PRI_kld " %s (%s)",
+ ret, u_error_str, strerror(u_error));
+ else
+ tprintf("= %" PRI_kld " (errno %lu)", ret, u_error);
}
+static long get_regs(struct tcb *);
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 fault_opts *fault_vec[SUPPORTED_PERSONALITIES];
+struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
-static struct fault_opts *
-tcb_fault_opts(struct tcb *tcp)
+static struct inject_opts *
+tcb_inject_opts(struct tcb *tcp)
{
- return (scno_in_range(tcp->scno) && tcp->fault_vec[current_personality])
- ? &tcp->fault_vec[current_personality][tcp->scno] : NULL;
+ return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
+ ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
}
static long
-inject_syscall_fault_entering(struct tcb *tcp)
+tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
{
- if (!tcp->fault_vec[current_personality]) {
- tcp->fault_vec[current_personality] =
- xcalloc(nsyscalls, sizeof(**fault_vec));
- memcpy(tcp->fault_vec[current_personality],
- fault_vec[current_personality],
- nsyscalls * sizeof(**fault_vec));
+ 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 fault_opts *opts = tcb_fault_opts(tcp);
+ struct inject_opts *opts = tcb_inject_opts(tcp);
if (!opts || opts->first == 0)
return 0;
opts->first = opts->step;
- if (!arch_set_scno(tcp, -1))
- tcp->flags |= TCB_FAULT_INJ;
+ if (!recovering(tcp)) {
+ if (opts->data.flags & INJECT_F_SIGNAL)
+ *signo = opts->data.signo;
+ if (opts->data.flags & (INJECT_F_ERROR | INJECT_F_RETVAL) &&
+ !arch_set_scno(tcp, -1))
+ tcp->flags |= TCB_TAMPERED;
+ if (opts->data.flags & INJECT_F_DELAY_ENTER)
+ delay_tcb(tcp, opts->data.delay_idx, true);
+ if (opts->data.flags & INJECT_F_DELAY_EXIT)
+ tcp->flags |= TCB_INJECT_DELAY_EXIT;
+ }
return 0;
}
static long
-update_syscall_fault_exiting(struct tcb *tcp)
+tamper_with_syscall_exiting(struct tcb *tcp)
{
- struct fault_opts *opts = tcb_fault_opts(tcp);
+ struct inject_opts *opts = tcb_inject_opts(tcp);
+ if (!opts)
+ return 0;
+
+ if (inject_delay_exit(tcp))
+ delay_tcb(tcp, opts->data.delay_idx, false);
+
+ if (!syscall_tampered(tcp))
+ return 0;
+
+ if (!syserror(tcp)) {
+ error_msg("Failed to tamper with process %d: got no error "
+ "(return value %#" PRI_klx ")",
+ tcp->pid, tcp->u_rval);
+
+ return 1;
+ }
+
+ bool update_tcb = false;
- if (opts && opts->err && tcp->u_error != opts->err) {
- unsigned long u_error = tcp->u_error;
- tcp->u_error = opts->err;
- if (arch_set_error(tcp))
- tcp->u_error = u_error;
+ if (opts->data.flags & INJECT_F_RETVAL) {
+ kernel_long_t inject_rval =
+ retval_get(opts->data.rval_idx);
+ kernel_long_t u_rval = tcp->u_rval;
+
+ tcp->u_rval = inject_rval;
+ if (arch_set_success(tcp)) {
+ tcp->u_rval = u_rval;
+ } else {
+ update_tcb = true;
+ tcp->u_error = 0;
+ }
+ } else {
+ unsigned long new_error = retval_get(opts->data.rval_idx);
+
+ 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;
+ } else {
+ update_tcb = true;
+ }
+ }
+ }
+
+ if (update_tcb) {
+ tcp->u_error = 0;
+ get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
}
return 0;
}
-static int
-trace_syscall_entering(struct tcb *tcp)
+/*
+ * Returns:
+ * 0: "ignore this ptrace stop", bail out silently.
+ * 1: ok, decoded; call
+ * syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
+ * other: error; call syscall_entering_finish(tcp, res), where res is the value
+ * returned.
+ */
+int
+syscall_entering_decode(struct tcb *tcp)
{
- int res, scno_good;
-
- scno_good = res = get_scno(tcp);
+ int res = get_scno(tcp);
if (res == 0)
return res;
- if (res == 1)
- res = get_syscall_args(tcp);
-
- if (res != 1) {
+ int scno_good = res;
+ if (res != 1 || (res = get_syscall_args(tcp)) != 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;
+ return res;
}
-#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) {
+#if defined SYS_ipc_subcall \
+ || defined SYS_socket_subcall \
+ || defined SYS_syscall_subcall
+ for (;;) {
+ switch (tcp->s_ent->sen) {
+# ifdef SYS_ipc_subcall
+ case SEN_ipc:
+ decode_ipc_subcall(tcp);
+ break;
+# endif
# ifdef SYS_socket_subcall
case SEN_socketcall:
decode_socket_subcall(tcp);
break;
# endif
-# ifdef SYS_ipc_subcall
- case SEN_ipc:
- decode_ipc_subcall(tcp);
+# ifdef SYS_syscall_subcall
+ case SEN_syscall:
+ decode_syscall_subcall(tcp);
+ if (tcp->s_ent->sen != SEN_syscall)
+ continue;
break;
# endif
+ }
+ break;
}
#endif
+ return 1;
+}
+
+int
+syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
+{
/* Restrain from fault injection while the trace executes strace code. */
if (hide_log(tcp)) {
- tcp->qual_flg &= ~QUAL_FAULT;
+ tcp->qual_flg &= ~QUAL_INJECT;
}
switch (tcp->s_ent->sen) {
break;
}
- if (!(tcp->qual_flg & QUAL_TRACE)
- || (tracing_paths && !pathtrace_match(tcp))
- ) {
- tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
- tcp->sys_func_rval = 0;
+ if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
+ tcp->flags |= TCB_FILTERED;
return 0;
}
tcp->flags &= ~TCB_FILTERED;
if (hide_log(tcp)) {
- res = 0;
- goto ret;
+ return 0;
}
- if (tcp->qual_flg & QUAL_FAULT)
- inject_syscall_fault_entering(tcp);
+ if (inject(tcp))
+ tamper_with_syscall_entering(tcp, sig);
if (cflag == CFLAG_ONLY_STATS) {
- res = 0;
- goto ret;
+ return 0;
}
-#ifdef USE_LIBUNWIND
+#ifdef ENABLE_STACKTRACE
if (stack_trace_enabled) {
if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
- unwind_capture_stacktrace(tcp);
+ unwind_tcb_capture(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);
-
+ int res = raw(tcp) ? printargs(tcp) : 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_fault_injected(struct tcb *tcp)
+void
+syscall_entering_finish(struct tcb *tcp, int res)
{
- return tcp->flags & TCB_FAULT_INJ;
+ tcp->flags |= TCB_INSYSCALL;
+ tcp->sys_func_rval = res;
+ /* Measure the entrance time as late as possible to avoid errors. */
+ if ((Tflag || cflag) && !filtered(tcp))
+ clock_gettime(CLOCK_MONOTONIC, &tcp->etime);
}
-static int
-trace_syscall_exiting(struct tcb *tcp)
+/* Returns:
+ * 0: "bail out".
+ * 1: ok.
+ * -1: error in one of ptrace ops.
+ *
+ * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
+ * value. Anyway, call syscall_exiting_finish(tcp) then.
+ */
+int
+syscall_exiting_decode(struct tcb *tcp, struct timespec *pts)
{
- 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);
+ if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
+ clock_gettime(CLOCK_MONOTONIC, pts);
-#ifdef USE_LIBUNWIND
- if (stack_trace_enabled) {
- if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
- unwind_cache_invalidate(tcp);
- }
-#endif
+ if (tcp->s_ent->sys_flags & MEMORY_MAPPING_CHANGE)
+ mmap_notify_report(tcp);
+
+ if (filtered(tcp) || hide_log(tcp))
+ return 0;
#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_fault_injected(tcp))
- update_syscall_fault_exiting(tcp);
+ return get_syscall_result(tcp);
+}
+
+int
+syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res)
+{
+ if (syscall_tampered(tcp) || inject_delay_exit(tcp))
+ tamper_with_syscall_exiting(tcp);
if (cflag) {
- count_syscall(tcp, &tv);
+ count_syscall(tcp, ts);
if (cflag == CFLAG_ONLY_STATS) {
- goto ret;
+ return 0;
}
}
tabto();
tprints("= ? <unavailable>\n");
line_ended();
- tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
- 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) {
+ int sys_res = 0;
+ if (raw(tcp)) {
/* 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 ...>
+ * open("does_not_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 */
+ return 0; /* ignore failed syscalls */
if (tcp->sys_func_rval & RVAL_DECODED)
sys_res = tcp->sys_func_rval;
else
tprints(") ");
tabto();
- u_error = tcp->u_error;
- if (tcp->qual_flg & QUAL_RAW) {
- if (u_error) {
- tprintf("= -1 (errno %lu)", u_error);
- if (syscall_fault_injected(tcp))
- tprints(" (INJECTED)");
- } else {
+ if (raw(tcp)) {
+ if (tcp->u_error)
+ print_err_ret(tcp->u_rval, tcp->u_error);
+ else
tprintf("= %#" PRI_klx, tcp->u_rval);
- }
- }
- else if (!(sys_res & RVAL_NONE) && u_error) {
- switch (u_error) {
+
+ if (syscall_tampered(tcp))
+ tprints(" (INJECTED)");
+ } else if (!(sys_res & RVAL_NONE) && tcp->u_error) {
+ switch (tcp->u_error) {
/* Blocked signals do not interrupt any syscalls.
* In this case syscalls don't return ERESTARTfoo codes.
*
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));
+ print_err_ret(tcp->u_rval, tcp->u_error);
break;
}
- if (syscall_fault_injected(tcp))
- tprintf(" (INJECTED)");
+ if (syscall_tampered(tcp))
+ tprints(" (INJECTED)");
if ((sys_res & RVAL_STR) && tcp->auxstr)
tprintf(" (%s)", tcp->auxstr);
- }
- else {
+ } 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)) {
+ if (current_klongsize < sizeof(tcp->u_rval)) {
tprintf("= %#x",
(unsigned int) tcp->u_rval);
} else
break;
case RVAL_UDECIMAL:
#if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
- if (current_wordsize < sizeof(tcp->u_rval)) {
+ if (current_klongsize < sizeof(tcp->u_rval)) {
tprintf("= %u",
(unsigned int) tcp->u_rval);
} else
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
+ } else
tprintf("= %" PRI_kld, tcp->u_rval);
break;
default:
}
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);
+ ts_sub(ts, ts, &tcp->etime);
tprintf(" <%ld.%06ld>",
- (long) tv.tv_sec, (long) tv.tv_usec);
+ (long) ts->tv_sec, (long) ts->tv_nsec / 1000);
}
tprints("\n");
dumpio(tcp);
line_ended();
-#ifdef USE_LIBUNWIND
+#ifdef ENABLE_STACKTRACE
if (stack_trace_enabled)
- unwind_print_stacktrace(tcp);
+ unwind_tcb_print(tcp);
#endif
-
- ret:
- tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
- tcp->sys_func_rval = 0;
- free_tcb_priv_data(tcp);
return 0;
}
-int
-trace_syscall(struct tcb *tcp)
+void
+syscall_exiting_finish(struct tcb *tcp)
{
- return exiting(tcp) ?
- trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
+ tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED | TCB_INJECT_DELAY_EXIT);
+ tcp->sys_func_rval = 0;
+ free_tcb_priv_data(tcp);
}
bool
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;
-}
+#define XLAT_MACROS_ONLY
+# include "xlat/nt_descriptor_types.h"
+#undef XLAT_MACROS_ONLY
#include "arch_regs.c"
-#ifdef HAVE_GETRVAL2
+#if HAVE_ARCH_GETRVAL2
# include "arch_getrval2.c"
#endif
#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)
+# define ARCH_GET_PC upeek(tcp, 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)
+ if (get_regs(tcp) < 0 || ARCH_GET_PC)
tprints(current_wordsize == 4 ? "[????????] "
: "[????????????????] ");
else
#endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
+#ifdef ptrace_getregset_or_getregs
+static long get_regs_error;
+#endif
+
void
-get_regs(pid_t pid)
+clear_regs(struct tcb *tcp)
{
-#undef USE_GET_SYSCALL_RESULT_REGS
#ifdef ptrace_getregset_or_getregs
+ get_regs_error = -1;
+#endif
+}
+
+static long
+get_regs(struct tcb *const tcp)
+{
+#ifdef ptrace_getregset_or_getregs
+
+ if (get_regs_error != -1)
+ return get_regs_error;
# ifdef HAVE_GETREGS_OLD
/*
*/
static int use_getregs_old;
if (use_getregs_old < 0) {
- get_regs_error = ptrace_getregset_or_getregs(pid);
- return;
+ return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
} else if (use_getregs_old == 0) {
- get_regs_error = ptrace_getregset_or_getregs(pid);
+ get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
if (get_regs_error >= 0) {
use_getregs_old = -1;
- return;
+ return get_regs_error;
}
if (errno == EPERM || errno == ESRCH)
- return;
+ return get_regs_error;
use_getregs_old = 1;
}
- get_regs_error = getregs_old(pid);
+ return get_regs_error = getregs_old(tcp);
# else /* !HAVE_GETREGS_OLD */
/* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
- get_regs_error = ptrace_getregset_or_getregs(pid);
+ get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
+
+# if defined ARCH_PERSONALITY_0_IOV_SIZE
+ if (get_regs_error)
+ return get_regs_error;
+
+ switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
+ case ARCH_PERSONALITY_0_IOV_SIZE:
+ update_personality(tcp, 0);
+ break;
+ case ARCH_PERSONALITY_1_IOV_SIZE:
+ update_personality(tcp, 1);
+ break;
+ default: {
+ static bool printed = false;
+
+ if (!printed) {
+ error_msg("Unsupported regset size returned by "
+ "PTRACE_GETREGSET: %zu",
+ ARCH_IOVEC_FOR_GETREGSET.iov_len);
+
+ printed = true;
+ }
+
+ update_personality(tcp, 0);
+ }
+ }
+# endif /* ARCH_PERSONALITY_0_IOV_SIZE */
+
+ return get_regs_error;
+
# 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;
+ return 0;
#endif /* !ptrace_getregset_or_getregs */
}
struct sysent_buf {
struct tcb *tcp;
struct_sysent ent;
- char buf[sizeof("syscall_%lu") + sizeof(kernel_ulong_t) * 3];
+ char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
};
static void
/*
* 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.
+ * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
+ * out silently" code.
+ * 1: ok, continue in syscall_entering_decode().
+ * other: error, syscall_entering_decode() should print error indicator
+ * ("????" etc) and return an appropriate code.
*/
int
get_scno(struct tcb *tcp)
{
- if (get_regs_error)
+ if (get_regs(tcp) < 0)
return -1;
int rc = arch_get_scno(tcp);
if (rc != 1)
return rc;
+ tcp->scno = shuffle_scno(tcp->scno);
+
if (scno_is_valid(tcp->scno)) {
tcp->s_ent = &sysent[tcp->scno];
tcp->qual_flg = qual_flags(tcp->scno);
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));
+ xsprintf(s->buf, "syscall_%#" PRI_klx, 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);
+ debug_msg("pid %d invalid syscall %#" PRI_klx,
+ tcp->pid, shuffle_scno(tcp->scno));
}
+
+ /*
+ * We refrain from argument decoding during recovering
+ * as tracee memory mappings has changed and the registers
+ * are very likely pointing to garbage already.
+ */
+ if (recovering(tcp))
+ tcp->qual_flg |= QUAL_RAW;
+
return 1;
}
-#ifdef USE_GET_SYSCALL_RESULT_REGS
+#ifdef ptrace_getregset_or_getregs
+# define get_syscall_result_regs get_regs
+#else
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
+ * 1: ok, continue in syscall_exiting_trace().
+ * -1: error, syscall_exiting_trace() 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))
+ if (get_syscall_result_regs(tcp) < 0)
return -1;
-#endif
tcp->u_error = 0;
- get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
+ get_error(tcp,
+ !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
+ || syscall_tampered(tcp));
return 1;
}
#include "get_scno.c"
#include "set_scno.c"
#include "get_syscall_args.c"
-#ifdef USE_GET_SYSCALL_RESULT_REGS
+#ifndef ptrace_getregset_or_getregs
# include "get_syscall_result.c"
#endif
#include "get_error.c"
#ifdef HAVE_GETREGS_OLD
# include "getregs_old.c"
#endif
+#include "shuffle_scno.c"
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;
+ return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
}
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