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[src/trunk]: src/tests/kernel/arch/amd64 Add dbregs_dr[0123]_trap_variable in...
details: https://anonhg.NetBSD.org/src/rev/31868da0bb42
branches: trunk
changeset: 349284:31868da0bb42
user: kamil <kamil%NetBSD.org@localhost>
date: Sun Dec 04 03:38:58 2016 +0000
description:
Add dbregs_dr[0123]_trap_variable in arch/amd64/t_ptrace_wait*
Add new preliminary tests for testing that CPU Debug Registers can be used
to trap on a variable (write operation).
dbregs_dr0_trap_variable:
Verify that setting trap with DR0 triggers SIGTRAP
dbregs_dr1_trap_variable:
Verify that setting trap with DR1 triggers SIGTRAP
dbregs_dr2_trap_variable:
Verify that setting trap with DR2 triggers SIGTRAP
dbregs_dr3_trap_variable:
Verify that setting trap with DR3 triggers SIGTRAP
Sponsored by <The NetBSD Foundation>
diffstat:
tests/kernel/arch/amd64/t_ptrace_wait.c | 487 +++++++++++++++++++++++++++++++-
1 files changed, 484 insertions(+), 3 deletions(-)
diffs (truncated from 528 to 300 lines):
diff -r 686ebe487f75 -r 31868da0bb42 tests/kernel/arch/amd64/t_ptrace_wait.c
--- a/tests/kernel/arch/amd64/t_ptrace_wait.c Sat Dec 03 22:28:16 2016 +0000
+++ b/tests/kernel/arch/amd64/t_ptrace_wait.c Sun Dec 04 03:38:58 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: t_ptrace_wait.c,v 1.3 2016/12/03 01:41:15 kamil Exp $ */
+/* $NetBSD: t_ptrace_wait.c,v 1.4 2016/12/04 03:38:58 kamil Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.3 2016/12/03 01:41:15 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.4 2016/12/04 03:38:58 kamil Exp $");
#include <sys/param.h>
#include <sys/types.h>
@@ -53,6 +53,38 @@
#include "../../t_ptrace_wait.h"
+
+union u {
+ long raw;
+ struct {
+ long local_dr0_breakpoint : 1; /* 0 */
+ long global_dr0_breakpoint : 1; /* 1 */
+ long local_dr1_breakpoint : 1; /* 2 */
+ long global_dr1_breakpoint : 1; /* 3 */
+ long local_dr2_breakpoint : 1; /* 4 */
+ long global_dr2_breakpoint : 1; /* 5 */
+ long local_dr3_breakpoint : 1; /* 6 */
+ long global_dr3_breakpoint : 1; /* 7 */
+ long local_exact_breakpt : 1; /* 8 */
+ long global_exact_breakpt : 1; /* 9 */
+ long reserved_10 : 1; /* 10 */
+ long rest_trans_memory : 1; /* 11 */
+ long reserved_12 : 1; /* 12 */
+ long general_detect_enable : 1; /* 13 */
+ long reserved_14 : 1; /* 14 */
+ long reserved_15 : 1; /* 15 */
+ long condition_dr0 : 2; /* 16-17 */
+ long len_dr0 : 2; /* 18-19 */
+ long condition_dr1 : 2; /* 20-21 */
+ long len_dr1 : 2; /* 22-23 */
+ long condition_dr2 : 2; /* 24-25 */
+ long len_dr2 : 2; /* 26-27 */
+ long condition_dr3 : 2; /* 28-29 */
+ long len_dr3 : 2; /* 30-31 */
+ } bits;
+};
+
+
#if defined(HAVE_DBREGS)
ATF_TC(dbregs_print);
ATF_TC_HEAD(dbregs_print, tc)
@@ -89,7 +121,7 @@
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);
+ validate_status_stopped(status, sigval);
printf("Call GETDBREGS for the child process\n");
ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r, 0) != -1);
@@ -1192,6 +1224,450 @@
}
#endif
+#if defined(HAVE_DBREGS)
+ATF_TC(dbregs_dr0_trap_variable);
+ATF_TC_HEAD(dbregs_dr0_trap_variable, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that setting trap with DR0 triggers SIGTRAP");
+}
+
+ATF_TC_BODY(dbregs_dr0_trap_variable, tc)
+{
+ const int exitval = 5;
+ const int sigval = SIGSTOP;
+ pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+ struct dbreg r1;
+ struct dbreg r2;
+ /* Number of available CPU Debug Registers on AMD64 */
+ const size_t len = 16;
+ size_t i;
+ volatile int watchme;
+ union u dr7;
+
+ dr7.raw = 0;
+ dr7.bits.global_dr0_breakpoint = 1;
+ dr7.bits.condition_dr0 = 3; /* 0b11 -- break on data write&read */
+ dr7.bits.len_dr0 = 3; /* 0b11 -- 4 bytes */
+
+ printf("Assert that known number of Debug Registers (%zu) is valid\n",
+ len);
+ ATF_REQUIRE_EQ(__arraycount(r1.dbregs), len);
+ ATF_REQUIRE_EQ(__arraycount(r2.dbregs), len);
+
+ printf("Before forking process PID=%d\n", getpid());
+ child = atf_utils_fork();
+ 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);
+
+ watchme = 1;
+
+ printf("Before raising %s from child\n", strsignal(sigval));
+ FORKEE_ASSERT(raise(sigval) == 0);
+
+ 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("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.dbregs); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dbregs[i]);
+
+ r1.dbregs[0] = (long)(intptr_t)&watchme;
+ printf("Set DR0 (r1.dbregs[0]) to new value %#lx\n", r1.dbregs[0]);
+
+ r1.dbregs[7] = dr7.raw;
+ printf("Set DR7 (r1.dbregs[7]) to new value %#lx\n", r1.dbregs[7]);
+
+ printf("New state of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dbregs); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dbregs[i]);
+
+ printf("Call SETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+ printf("Call CONTINUE for the child process\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, SIGTRAP);
+
+ 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("Call GETDBREGS for the child process (r2)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);
+
+ printf("Assert that (r1) and (r2) are the same\n");
+ ATF_REQUIRE(memcmp(&r1, &r2, len) == 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\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\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+#endif
+
+#if defined(HAVE_DBREGS)
+ATF_TC(dbregs_dr1_trap_variable);
+ATF_TC_HEAD(dbregs_dr1_trap_variable, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that setting trap with DR1 triggers SIGTRAP");
+}
+
+ATF_TC_BODY(dbregs_dr1_trap_variable, tc)
+{
+ const int exitval = 5;
+ const int sigval = SIGSTOP;
+ pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+ struct dbreg r1;
+ struct dbreg r2;
+ /* Number of available CPU Debug Registers on AMD64 */
+ const size_t len = 16;
+ size_t i;
+ volatile int watchme;
+ union u dr7;
+
+ dr7.raw = 0;
+ dr7.bits.global_dr1_breakpoint = 1;
+ dr7.bits.condition_dr1 = 3; /* 0b11 -- break on data write&read */
+ dr7.bits.len_dr1 = 3; /* 0b11 -- 4 bytes */
+
+ printf("Assert that known number of Debug Registers (%zu) is valid\n",
+ len);
+ ATF_REQUIRE_EQ(__arraycount(r1.dbregs), len);
+ ATF_REQUIRE_EQ(__arraycount(r2.dbregs), len);
+
+ printf("Before forking process PID=%d\n", getpid());
+ child = atf_utils_fork();
+ 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);
+
+ watchme = 1;
+
+ printf("Before raising %s from child\n", strsignal(sigval));
+ FORKEE_ASSERT(raise(sigval) == 0);
+
+ 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("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.dbregs); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dbregs[i]);
+
+ r1.dbregs[1] = (long)(intptr_t)&watchme;
+ printf("Set DR1 (r1.dbregs[1]) to new value %#lx\n", r1.dbregs[1]);
+
+ r1.dbregs[7] = dr7.raw;
+ printf("Set DR7 (r1.dbregs[7]) to new value %#lx\n", r1.dbregs[7]);
+
+ printf("New state of the debug registers (r1):\n");
+ for (i = 0; i < __arraycount(r1.dbregs); i++)
+ printf("r1[%zu]=%#lx\n", i, r1.dbregs[i]);
+
+ printf("Call SETDBREGS for the child process (r1)\n");
+ ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+ printf("Call CONTINUE for the child process\n");
+ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+ printf("Before calling %s() for the child\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+ validate_status_stopped(status, SIGTRAP);
+
+ 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("Call GETDBREGS for the child process (r2)\n");
+ ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);
+
+ printf("Assert that (r1) and (r2) are the same\n");
+ ATF_REQUIRE(memcmp(&r1, &r2, len) == 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\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\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+#endif
+
+#if defined(HAVE_DBREGS)
+ATF_TC(dbregs_dr2_trap_variable);
+ATF_TC_HEAD(dbregs_dr2_trap_variable, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that setting trap with DR2 triggers SIGTRAP");
+}
+
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