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>
This commit is contained in:
kamil
parent
89cfb5786e
commit
69781b08f0
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@ -1,4 +1,4 @@
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/* $NetBSD: t_ptrace_wait.c,v 1.21 2017/02/20 05:47:59 kamil Exp $ */
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/* $NetBSD: t_ptrace_wait.c,v 1.22 2017/02/20 06:18:48 kamil Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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@ -27,7 +27,7 @@
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: t_ptrace_wait.c,v 1.21 2017/02/20 05:47:59 kamil Exp $");
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__RCSID("$NetBSD: t_ptrace_wait.c,v 1.22 2017/02/20 06:18:48 kamil Exp $");
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#include <sys/param.h>
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#include <sys/types.h>
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@ -6412,6 +6412,260 @@ ATF_TC_BODY(dbregs_dr3_dont_inherit_lwp, tc)
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TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
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}
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ATF_TC(dbregs_dr6_dont_inherit_lwp);
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ATF_TC_HEAD(dbregs_dr6_dont_inherit_lwp, tc)
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{
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atf_tc_set_md_var(tc, "descr",
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"Verify that 1 LWP creation is intercepted by ptrace(2) with "
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"EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 6 from "
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"the forker thread is not inherited");
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}
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ATF_TC_BODY(dbregs_dr6_dont_inherit_lwp, tc)
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{
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const int exitval = 5;
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const int sigval = SIGSTOP;
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pid_t child, wpid;
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#if defined(TWAIT_HAVE_STATUS)
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int status;
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#endif
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ptrace_state_t state;
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const int slen = sizeof(state);
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ptrace_event_t event;
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const int elen = sizeof(event);
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ucontext_t uc;
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lwpid_t lid;
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static const size_t ssize = 16*1024;
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void *stack;
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size_t i;
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struct dbreg r1;
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struct dbreg r2;
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printf("Before forking process PID=%d\n", getpid());
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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printf("Before calling PT_TRACE_ME from child %d\n", getpid());
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FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
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printf("Before raising %s from child\n", strsignal(sigval));
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FORKEE_ASSERT(raise(sigval) == 0);
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printf("Before allocating memory for stack in child\n");
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FORKEE_ASSERT((stack = malloc(ssize)) != NULL);
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printf("Before making context for new lwp in child\n");
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_lwp_makecontext(&uc, lwp_main_func, NULL, NULL, stack, ssize);
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printf("Before creating new in child\n");
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FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);
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printf("Before waiting for lwp %d to exit\n", lid);
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FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);
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printf("Before verifying that reported %d and running lid %d "
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"are the same\n", lid, the_lwp_id);
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FORKEE_ASSERT_EQ(lid, the_lwp_id);
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printf("Before exiting of the child process\n");
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_exit(exitval);
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}
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printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
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printf("Before calling %s() for the child\n", TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_stopped(status, sigval);
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printf("Set empty EVENT_MASK for the child %d\n", child);
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event.pe_set_event = PTRACE_LWP_CREATE;
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ATF_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
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printf("Call GETDBREGS for the child process (r1)\n");
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ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
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printf("State of the debug registers (r1):\n");
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for (i = 0; i < __arraycount(r1.dr); i++)
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printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
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r1.dr[6] = 1; /* breakpoint condition dr0 detected */
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printf("Set DR6 (r1.dr[6]) to new value %#lx\n", r1.dr[6]);
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printf("New state of the debug registers (r1):\n");
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for (i = 0; i < __arraycount(r1.dr); i++)
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printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
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printf("Call SETDBREGS for the child process (r1)\n");
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ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
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printf("Before resuming the child process where it left off and "
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"without signal to be sent\n");
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
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printf("Before calling %s() for the child - expected stopped "
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"SIGTRAP\n", TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_stopped(status, SIGTRAP);
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ATF_REQUIRE(ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);
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ATF_REQUIRE_EQ(state.pe_report_event, PTRACE_LWP_CREATE);
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lid = state.pe_lwp;
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printf("Reported PTRACE_LWP_CREATE event with lid %d\n", lid);
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printf("Call GETDBREGS for the child process new lwp (r2)\n");
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ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, lid) != -1);
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printf("State of the debug registers (r2):\n");
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for (i = 0; i < __arraycount(r2.dr); i++)
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printf("r2[%zu]=%#lx\n", i, r2.dr[i]);
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printf("Assert that (r1) and (r2) are not the same\n");
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ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);
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printf("Before resuming the child process where it left off and "
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"without signal to be sent\n");
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
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printf("Before calling %s() for the child - expected exited\n",
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TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_exited(status, exitval);
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printf("Before calling %s() for the child - expected no process\n",
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TWAIT_FNAME);
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TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
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}
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ATF_TC(dbregs_dr7_dont_inherit_lwp);
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ATF_TC_HEAD(dbregs_dr7_dont_inherit_lwp, tc)
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{
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atf_tc_set_md_var(tc, "descr",
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"Verify that 1 LWP creation is intercepted by ptrace(2) with "
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"EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 7 from "
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"the forker thread is not inherited");
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}
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ATF_TC_BODY(dbregs_dr7_dont_inherit_lwp, tc)
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{
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const int exitval = 5;
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const int sigval = SIGSTOP;
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pid_t child, wpid;
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#if defined(TWAIT_HAVE_STATUS)
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int status;
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#endif
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ptrace_state_t state;
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const int slen = sizeof(state);
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ptrace_event_t event;
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const int elen = sizeof(event);
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ucontext_t uc;
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lwpid_t lid;
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static const size_t ssize = 16*1024;
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void *stack;
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size_t i;
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struct dbreg r1;
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struct dbreg r2;
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printf("Before forking process PID=%d\n", getpid());
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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printf("Before calling PT_TRACE_ME from child %d\n", getpid());
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FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
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printf("Before raising %s from child\n", strsignal(sigval));
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FORKEE_ASSERT(raise(sigval) == 0);
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printf("Before allocating memory for stack in child\n");
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FORKEE_ASSERT((stack = malloc(ssize)) != NULL);
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printf("Before making context for new lwp in child\n");
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_lwp_makecontext(&uc, lwp_main_func, NULL, NULL, stack, ssize);
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printf("Before creating new in child\n");
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FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);
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printf("Before waiting for lwp %d to exit\n", lid);
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FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);
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printf("Before verifying that reported %d and running lid %d "
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"are the same\n", lid, the_lwp_id);
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FORKEE_ASSERT_EQ(lid, the_lwp_id);
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printf("Before exiting of the child process\n");
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_exit(exitval);
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}
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printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
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printf("Before calling %s() for the child\n", TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_stopped(status, sigval);
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printf("Set empty EVENT_MASK for the child %d\n", child);
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event.pe_set_event = PTRACE_LWP_CREATE;
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ATF_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
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printf("Call GETDBREGS for the child process (r1)\n");
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ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
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printf("State of the debug registers (r1):\n");
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for (i = 0; i < __arraycount(r1.dr); i++)
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printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
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r1.dr[7] = __BIT(16); /* break on data writes dr0 */
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printf("Set DR6 (r1.dr[7]) to new value %#lx\n", r1.dr[7]);
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printf("New state of the debug registers (r1):\n");
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for (i = 0; i < __arraycount(r1.dr); i++)
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printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
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printf("Call SETDBREGS for the child process (r1)\n");
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ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
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printf("Before resuming the child process where it left off and "
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"without signal to be sent\n");
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
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printf("Before calling %s() for the child - expected stopped "
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"SIGTRAP\n", TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_stopped(status, SIGTRAP);
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ATF_REQUIRE(ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);
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ATF_REQUIRE_EQ(state.pe_report_event, PTRACE_LWP_CREATE);
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lid = state.pe_lwp;
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printf("Reported PTRACE_LWP_CREATE event with lid %d\n", lid);
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printf("Call GETDBREGS for the child process new lwp (r2)\n");
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ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, lid) != -1);
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printf("State of the debug registers (r2):\n");
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for (i = 0; i < __arraycount(r2.dr); i++)
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printf("r2[%zu]=%#lx\n", i, r2.dr[i]);
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printf("Assert that (r1) and (r2) are not the same\n");
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ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);
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printf("Before resuming the child process where it left off and "
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"without signal to be sent\n");
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
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printf("Before calling %s() for the child - expected exited\n",
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TWAIT_FNAME);
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TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
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validate_status_exited(status, exitval);
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printf("Before calling %s() for the child - expected no process\n",
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TWAIT_FNAME);
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TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
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}
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ATF_TP_ADD_TCS(tp)
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{
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setvbuf(stdout, NULL, _IONBF, 0);
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@ -6490,6 +6744,8 @@ ATF_TP_ADD_TCS(tp)
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ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_dont_inherit_lwp);
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ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_dont_inherit_lwp);
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ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_dont_inherit_lwp);
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ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr6_dont_inherit_lwp);
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ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr7_dont_inherit_lwp);
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return atf_no_error();
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}
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