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Add two tests for TRAP_* signal codes for SIGTRAP.

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- ptrace__breakpoint_siginfo tests that a SIGTRAP for a software breakpoint
  in userland triggers a SIGTRAP with a signal code of TRAP_BRKPT.
- ptrace__step_siginfo tests that a SIGTRAP reported for a step after
  stepping via PT_STEP or PT_SETSTEP has a signal code of TRAP_TRACE.
This commit is contained in:
jhb 2018-04-24 05:30:05 +00:00
parent bcd7a2f67d
commit e2b0d83db1
1 changed files with 108 additions and 0 deletions
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108
tests/sys/kern/ptrace_test.c
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@ -3488,6 +3488,110 @@ ATF_TC_BODY(ptrace__PT_STEP_with_signal, tc)
ATF_REQUIRE(errno == ECHILD);
}
#ifdef HAVE_BREAKPOINT
/*
* Verify that a SIGTRAP event with the TRAP_BRKPT code is reported
* for a breakpoint trap.
*/
ATF_TC_WITHOUT_HEAD(ptrace__breakpoint_siginfo);
ATF_TC_BODY(ptrace__breakpoint_siginfo, tc)
{
struct ptrace_lwpinfo pl;
pid_t fpid, wpid;
int status;
ATF_REQUIRE((fpid = fork()) != -1);
if (fpid == 0) {
trace_me();
breakpoint();
exit(1);
}
/* The first wait() should report the stop from SIGSTOP. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(wpid == fpid);
ATF_REQUIRE(WIFSTOPPED(status));
ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
/* Continue the child ignoring the SIGSTOP. */
ATF_REQUIRE(ptrace(PT_CONTINUE, fpid, (caddr_t)1, 0) == 0);
/* The second wait() should report hitting the breakpoint. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(wpid == fpid);
ATF_REQUIRE(WIFSTOPPED(status));
ATF_REQUIRE(WSTOPSIG(status) == SIGTRAP);
ATF_REQUIRE(ptrace(PT_LWPINFO, wpid, (caddr_t)&pl, sizeof(pl)) != -1);
ATF_REQUIRE((pl.pl_flags & PL_FLAG_SI) != 0);
ATF_REQUIRE(pl.pl_siginfo.si_signo == SIGTRAP);
ATF_REQUIRE(pl.pl_siginfo.si_code == TRAP_BRKPT);
/* Kill the child process. */
ATF_REQUIRE(ptrace(PT_KILL, fpid, 0, 0) == 0);
/* The last wait() should report the SIGKILL. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(wpid == fpid);
ATF_REQUIRE(WIFSIGNALED(status));
ATF_REQUIRE(WTERMSIG(status) == SIGKILL);
wpid = wait(&status);
ATF_REQUIRE(wpid == -1);
ATF_REQUIRE(errno == ECHILD);
}
#endif /* HAVE_BREAKPOINT */
/*
* Verify that a SIGTRAP event with the TRAP_TRACE code is reported
* for a single-step trap from PT_STEP.
*/
ATF_TC_WITHOUT_HEAD(ptrace__step_siginfo);
ATF_TC_BODY(ptrace__step_siginfo, tc)
{
struct ptrace_lwpinfo pl;
pid_t fpid, wpid;
int status;
ATF_REQUIRE((fpid = fork()) != -1);
if (fpid == 0) {
trace_me();
exit(1);
}
/* The first wait() should report the stop from SIGSTOP. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(wpid == fpid);
ATF_REQUIRE(WIFSTOPPED(status));
ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
/* Step the child ignoring the SIGSTOP. */
ATF_REQUIRE(ptrace(PT_STEP, fpid, (caddr_t)1, 0) == 0);
/* The second wait() should report a single-step trap. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(wpid == fpid);
ATF_REQUIRE(WIFSTOPPED(status));
ATF_REQUIRE(WSTOPSIG(status) == SIGTRAP);
ATF_REQUIRE(ptrace(PT_LWPINFO, wpid, (caddr_t)&pl, sizeof(pl)) != -1);
ATF_REQUIRE((pl.pl_flags & PL_FLAG_SI) != 0);
ATF_REQUIRE(pl.pl_siginfo.si_signo == SIGTRAP);
ATF_REQUIRE(pl.pl_siginfo.si_code == TRAP_TRACE);
/* Continue the child process. */
ATF_REQUIRE(ptrace(PT_CONTINUE, fpid, (caddr_t)1, 0) == 0);
/* The last event should be for the child process's exit. */
wpid = waitpid(fpid, &status, 0);
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE(WEXITSTATUS(status) == 1);
wpid = wait(&status);
ATF_REQUIRE(wpid == -1);
ATF_REQUIRE(errno == ECHILD);
}
#if defined(HAVE_BREAKPOINT) && defined(SKIP_BREAK)
static void *
continue_thread(void *arg __unused)
@ -3713,6 +3817,10 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, ptrace__event_mask_sigkill_discard);
ATF_TP_ADD_TC(tp, ptrace__PT_ATTACH_with_SBDRY_thread);
ATF_TP_ADD_TC(tp, ptrace__PT_STEP_with_signal);
#ifdef HAVE_BREAKPOINT
ATF_TP_ADD_TC(tp, ptrace__breakpoint_siginfo);
#endif
ATF_TP_ADD_TC(tp, ptrace__step_siginfo);
#if defined(HAVE_BREAKPOINT) && defined(SKIP_BREAK)
ATF_TP_ADD_TC(tp, ptrace__PT_CONTINUE_different_thread);
#endif