Module Name: src
Committed By: kamil
Date: Mon Feb 20 06:18:48 UTC 2017
Modified Files:
src/tests/kernel/arch/amd64: t_ptrace_wait.c
Log Message:
Add new tests dbregs_dr[67]_dont_inherit_lwp in arch/amd64
New tests:
- dbregs_dr6_dont_inherit_lwp
- dbregs_dr7_dont_inherit_lwp
Debug Registers are set always per-LWP and they are never inherited.
If a user wants to reuse them, there is need to set trap on thread creation
(PTRACE_LWP_CREATE) and set them from a debugger on newly created LWP.
Sponsored by <The NetBSD Foundation>
To generate a diff of this commit:
cvs rdiff -u -r1.21 -r1.22 src/tests/kernel/arch/amd64/t_ptrace_wait.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/tests/kernel/arch/amd64/t_ptrace_wait.c
diff -u src/tests/kernel/arch/amd64/t_ptrace_wait.c:1.21 src/tests/kernel/arch/amd64/t_ptrace_wait.c:1.22
--- src/tests/kernel/arch/amd64/t_ptrace_wait.c:1.21 Mon Feb 20 05:47:59 2017
+++ src/tests/kernel/arch/amd64/t_ptrace_wait.c Mon Feb 20 06:18:48 2017
@@ -1,4 +1,4 @@
-/* $NetBSD: t_ptrace_wait.c,v 1.21 2017/02/20 05:47:59 kamil Exp $ */
+/* $NetBSD: t_ptrace_wait.c,v 1.22 2017/02/20 06:18:48 kamil Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.21 2017/02/20 05:47:59 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.22 2017/02/20 06:18:48 kamil Exp $");
#include <sys/param.h>
#include <sys/types.h>
@@ -6412,6 +6412,260 @@ ATF_TC_BODY(dbregs_dr3_dont_inherit_lwp,
TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
+ATF_TC(dbregs_dr6_dont_inherit_lwp);
+ATF_TC_HEAD(dbregs_dr6_dont_inherit_lwp, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that 1 LWP creation is intercepted by ptrace(2) with "
+ "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 6 from "
+ "the forker thread is not inherited");
+}
+
+ATF_TC_BODY(dbregs_dr6_dont_inherit_lwp, tc)
+{
+ const int exitval = 5;
+ const int sigval = SIGSTOP;
+ pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+ ptrace_state_t state;
+ const int slen = sizeof(state);
+ ptrace_event_t event;
+ const int elen = sizeof(event);
+ ucontext_t uc;
+ lwpid_t lid;
+ static const size_t ssize = 16*1024;
+ void *stack;
+ size_t i;
+ struct dbreg r1;
+ struct dbreg r2;
+
+ printf("Before forking process PID=%d\n", getpid());
+ ATF_REQUIRE((child = fork()) != -1);
+ if (child == 0) {
+ printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+ FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+ printf("Before raising %s from child\n", strsignal(sigval));
+ FORKEE_ASSERT(raise(sigval) == 0);
+
+ printf("Before allocating memory for stack in child\n");
+ FORKEE_ASSERT((stack = malloc(ssize)) != NULL);
+
+ printf("Before making context for new lwp in child\n");
+ _lwp_makecontext(&uc, lwp_main_func, NULL, NULL, stack, ssize);
+
+ printf("Before creating new in child\n");
+ FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);
+
+ printf("Before waiting for lwp %d to exit\n", lid);
+ FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);
+
+ printf("Before verifying that reported %d and running lid %d "
+ "are the same\n", lid, the_lwp_id);
+ FORKEE_ASSERT_EQ(lid, the_lwp_id);
+
+ printf("Before exiting of the child process\n");
+ _exit(exitval);
+ }
+ printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+ printf("Before calling %s() for the child\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, sigval);
+
+ printf("Set empty EVENT_MASK for the child %d\n", child);
+ event.pe_set_event = PTRACE_LWP_CREATE;
+ ATF_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
+
+ printf("Call GETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
+
+ printf("State of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dr); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+ r1.dr[6] = 1; /* breakpoint condition dr0 detected */
+ printf("Set DR6 (r1.dr[6]) to new value %#lx\n", r1.dr[6]);
+
+ printf("New state of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dr); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+ printf("Call SETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+ printf("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child - expected stopped "
+ "SIGTRAP\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, SIGTRAP);
+
+ ATF_REQUIRE(ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);
+
+ ATF_REQUIRE_EQ(state.pe_report_event, PTRACE_LWP_CREATE);
+
+ lid = state.pe_lwp;
+ printf("Reported PTRACE_LWP_CREATE event with lid %d\n", lid);
+
+ printf("Call GETDBREGS for the child process new lwp (r2)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, lid) != -1);
+
+ printf("State of the debug registers (r2):\n");
+ for (i = 0; i < __arraycount(r2.dr); i++)
+ printf("r2[%zu]=%#lx\n", i, r2.dr[i]);
+
+ printf("Assert that (r1) and (r2) are not the same\n");
+ ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);
+
+ printf("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child - expected exited\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_exited(status, exitval);
+
+ printf("Before calling %s() for the child - expected no process\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
+ATF_TC(dbregs_dr7_dont_inherit_lwp);
+ATF_TC_HEAD(dbregs_dr7_dont_inherit_lwp, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that 1 LWP creation is intercepted by ptrace(2) with "
+ "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 7 from "
+ "the forker thread is not inherited");
+}
+
+ATF_TC_BODY(dbregs_dr7_dont_inherit_lwp, tc)
+{
+ const int exitval = 5;
+ const int sigval = SIGSTOP;
+ pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+ ptrace_state_t state;
+ const int slen = sizeof(state);
+ ptrace_event_t event;
+ const int elen = sizeof(event);
+ ucontext_t uc;
+ lwpid_t lid;
+ static const size_t ssize = 16*1024;
+ void *stack;
+ size_t i;
+ struct dbreg r1;
+ struct dbreg r2;
+
+ printf("Before forking process PID=%d\n", getpid());
+ ATF_REQUIRE((child = fork()) != -1);
+ if (child == 0) {
+ printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+ FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+ printf("Before raising %s from child\n", strsignal(sigval));
+ FORKEE_ASSERT(raise(sigval) == 0);
+
+ printf("Before allocating memory for stack in child\n");
+ FORKEE_ASSERT((stack = malloc(ssize)) != NULL);
+
+ printf("Before making context for new lwp in child\n");
+ _lwp_makecontext(&uc, lwp_main_func, NULL, NULL, stack, ssize);
+
+ printf("Before creating new in child\n");
+ FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);
+
+ printf("Before waiting for lwp %d to exit\n", lid);
+ FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);
+
+ printf("Before verifying that reported %d and running lid %d "
+ "are the same\n", lid, the_lwp_id);
+ FORKEE_ASSERT_EQ(lid, the_lwp_id);
+
+ printf("Before exiting of the child process\n");
+ _exit(exitval);
+ }
+ printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+ printf("Before calling %s() for the child\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, sigval);
+
+ printf("Set empty EVENT_MASK for the child %d\n", child);
+ event.pe_set_event = PTRACE_LWP_CREATE;
+ ATF_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
+
+ printf("Call GETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
+
+ printf("State of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dr); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+ r1.dr[7] = __BIT(16); /* break on data writes dr0 */
+ printf("Set DR6 (r1.dr[7]) to new value %#lx\n", r1.dr[7]);
+
+ printf("New state of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dr); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+ printf("Call SETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+ printf("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child - expected stopped "
+ "SIGTRAP\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, SIGTRAP);
+
+ ATF_REQUIRE(ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);
+
+ ATF_REQUIRE_EQ(state.pe_report_event, PTRACE_LWP_CREATE);
+
+ lid = state.pe_lwp;
+ printf("Reported PTRACE_LWP_CREATE event with lid %d\n", lid);
+
+ printf("Call GETDBREGS for the child process new lwp (r2)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, lid) != -1);
+
+ printf("State of the debug registers (r2):\n");
+ for (i = 0; i < __arraycount(r2.dr); i++)
+ printf("r2[%zu]=%#lx\n", i, r2.dr[i]);
+
+ printf("Assert that (r1) and (r2) are not the same\n");
+ ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);
+
+ printf("Before resuming the child process where it left off and "
+ "without signal to be sent\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child - expected exited\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_exited(status, exitval);
+
+ printf("Before calling %s() for the child - expected no process\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
ATF_TP_ADD_TCS(tp)
{
setvbuf(stdout, NULL, _IONBF, 0);
@@ -6490,6 +6744,8 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_dont_inherit_lwp);
ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_dont_inherit_lwp);
ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_dont_inherit_lwp);
+ ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr6_dont_inherit_lwp);
+ ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr7_dont_inherit_lwp);
return atf_no_error();
}
