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[src/trunk]: src/tests/lib/libc/sys Add tests for reading registers from x86 ...



details:   https://anonhg.NetBSD.org/src/rev/0f8a41ec7521
branches:  trunk
changeset: 847888:0f8a41ec7521
user:      mgorny <mgorny%NetBSD.org@localhost>
date:      Wed Jan 08 17:23:34 2020 +0000

description:
Add tests for reading registers from x86 core dumps

diffstat:

 tests/lib/libc/sys/t_ptrace_x86_wait.h |  191 ++++++++++++++++++++++++--------
 1 files changed, 143 insertions(+), 48 deletions(-)

diffs (truncated from 325 to 300 lines):

diff -r a2c931199305 -r 0f8a41ec7521 tests/lib/libc/sys/t_ptrace_x86_wait.h
--- a/tests/lib/libc/sys/t_ptrace_x86_wait.h    Wed Jan 08 17:23:15 2020 +0000
+++ b/tests/lib/libc/sys/t_ptrace_x86_wait.h    Wed Jan 08 17:23:34 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_x86_wait.h,v 1.17 2020/01/08 17:23:15 mgorny Exp $    */
+/*     $NetBSD: t_ptrace_x86_wait.h,v 1.18 2020/01/08 17:23:34 mgorny Exp $    */
 
 /*-
  * Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@@ -2225,7 +2225,8 @@
 
 enum x86_test_regmode {
        TEST_GETREGS,
-       TEST_SETREGS
+       TEST_SETREGS,
+       TEST_COREDUMP
 };
 
 static __inline void get_gp32_regs(union x86_test_register out[])
@@ -2687,8 +2688,10 @@
 #endif
        struct xstate xst;
        struct iovec iov;
-       struct fxsave* fxs;
+       struct fxsave* fxs = NULL;
        uint64_t xst_flags = 0;
+       char core_path[] = "/tmp/core.XXXXXX";
+       int core_fd;
 
        const union x86_test_register expected[] __aligned(32) = {
                {{ 0x0706050403020100, 0x0F0E0D0C0B0A0908,
@@ -2796,6 +2799,7 @@
                DPRINTF("Before running assembly from child\n");
                switch (regmode) {
                case TEST_GETREGS:
+               case TEST_COREDUMP:
                        switch (regs) {
                        case GPREGS_32:
                                set_gp32_regs(expected);
@@ -2969,40 +2973,7 @@
 
        validate_status_stopped(status, sigval);
 
-       switch (regset) {
-       case TEST_GPREGS:
-               ATF_REQUIRE(regs < FPREGS_MM);
-               DPRINTF("Call GETREGS for the child process\n");
-               SYSCALL_REQUIRE(ptrace(PT_GETREGS, child, &gpr, 0) != -1);
-               break;
-       case TEST_XMMREGS:
-#if defined(__i386__)
-               ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
-               DPRINTF("Call GETXMMREGS for the child process\n");
-               SYSCALL_REQUIRE(ptrace(PT_GETXMMREGS, child, &xmm, 0) != -1);
-               fxs = &xmm.fxstate;
-               break;
-#else
-               /*FALLTHROUGH*/
-#endif
-       case TEST_FPREGS:
-#if defined(__x86_64__)
-               ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
-               fxs = &fpr.fxstate;
-#else
-               ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_XMM);
-#endif
-               DPRINTF("Call GETFPREGS for the child process\n");
-               SYSCALL_REQUIRE(ptrace(PT_GETFPREGS, child, &fpr, 0) != -1);
-               break;
-       case TEST_XSTATE:
-               ATF_REQUIRE(regs >= FPREGS_MM);
-               iov.iov_base = &xst;
-               iov.iov_len = sizeof(xst);
-
-               DPRINTF("Call GETXSTATE for the child process\n");
-               SYSCALL_REQUIRE(ptrace(PT_GETXSTATE, child, &iov, 0) != -1);
-
+       if (regset == TEST_XSTATE) {
                switch (regs) {
                case FPREGS_MM:
                        xst_flags |= XCR0_X87;
@@ -3020,21 +2991,117 @@
                        __unreachable();
                        break;
                }
-
-               ATF_REQUIRE((xst.xs_rfbm & xst_flags) == xst_flags);
-               switch (regmode) {
-               case TEST_SETREGS:
-                       xst.xs_rfbm = xst_flags;
-                       xst.xs_xstate_bv = xst_flags;
+       }
+
+       switch (regmode) {
+       case TEST_GETREGS:
+       case TEST_SETREGS:
+               switch (regset) {
+               case TEST_GPREGS:
+                       ATF_REQUIRE(regs < FPREGS_MM);
+                       DPRINTF("Call GETREGS for the child process\n");
+                       SYSCALL_REQUIRE(ptrace(PT_GETREGS, child, &gpr, 0)
+                           != -1);
+                       break;
+               case TEST_XMMREGS:
+#if defined(__i386__)
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
+                       DPRINTF("Call GETXMMREGS for the child process\n");
+                       SYSCALL_REQUIRE(ptrace(PT_GETXMMREGS, child, &xmm, 0)
+                           != -1);
+                       fxs = &xmm.fxstate;
+                       break;
+#else
+                       /*FALLTHROUGH*/
+#endif
+               case TEST_FPREGS:
+#if defined(__x86_64__)
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
+                       fxs = &fpr.fxstate;
+#else
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_XMM);
+#endif
+                       DPRINTF("Call GETFPREGS for the child process\n");
+                       SYSCALL_REQUIRE(ptrace(PT_GETFPREGS, child, &fpr, 0)
+                           != -1);
                        break;
-               case TEST_GETREGS:
+               case TEST_XSTATE:
+                       ATF_REQUIRE(regs >= FPREGS_MM);
+                       iov.iov_base = &xst;
+                       iov.iov_len = sizeof(xst);
+
+                       DPRINTF("Call GETXSTATE for the child process\n");
+                       SYSCALL_REQUIRE(ptrace(PT_GETXSTATE, child, &iov, 0)
+                           != -1);
+
+                       ATF_REQUIRE((xst.xs_rfbm & xst_flags) == xst_flags);
+                       switch (regmode) {
+                       case TEST_SETREGS:
+                               xst.xs_rfbm = xst_flags;
+                               xst.xs_xstate_bv = xst_flags;
+                               break;
+                       case TEST_GETREGS:
+                               ATF_REQUIRE((xst.xs_xstate_bv & xst_flags)
+                                   == xst_flags);
+                               break;
+                       case TEST_COREDUMP:
+                               __unreachable();
+                               break;
+                       }
+
+                       fxs = &xst.xs_fxsave;
+                       break;
+               }
+               break;
+       case TEST_COREDUMP:
+               SYSCALL_REQUIRE((core_fd = mkstemp(core_path)) != -1);
+               close(core_fd);
+
+               DPRINTF("Call DUMPCORE for the child process\n");
+               SYSCALL_REQUIRE(ptrace(PT_DUMPCORE, child, core_path,
+                   strlen(core_path)) != -1);
+
+               switch (regset) {
+               case TEST_GPREGS:
+                       ATF_REQUIRE(regs < FPREGS_MM);
+                       DPRINTF("Parse core file for PT_GETREGS\n");
+                       ATF_REQUIRE_EQ(core_find_note(core_path,
+                           "NetBSD-CORE@1", PT_GETREGS, &gpr, sizeof(gpr)),
+                           sizeof(gpr));
+                       break;
+               case TEST_XMMREGS:
+#if defined(__i386__)
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
+                       unlink(core_path);
+                       atf_tc_skip("XMMREGS not supported in core dumps");
+                       break;
+#else
+                       /*FALLTHROUGH*/
+#endif
+               case TEST_FPREGS:
+#if defined(__x86_64__)
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_YMM);
+                       fxs = &fpr.fxstate;
+#else
+                       ATF_REQUIRE(regs >= FPREGS_MM && regs < FPREGS_XMM);
+#endif
+                       DPRINTF("Parse core file for PT_GETFPREGS\n");
+                       ATF_REQUIRE_EQ(core_find_note(core_path,
+                           "NetBSD-CORE@1", PT_GETFPREGS, &fpr, sizeof(fpr)),
+                           sizeof(fpr));
+                       break;
+               case TEST_XSTATE:
+                       ATF_REQUIRE(regs >= FPREGS_MM);
+                       DPRINTF("Parse core file for PT_GETXSTATE\n");
+                       ATF_REQUIRE_EQ(core_find_note(core_path,
+                           "NetBSD-CORE@1", PT_GETXSTATE, &xst, sizeof(xst)),
+                           sizeof(xst));
                        ATF_REQUIRE((xst.xs_xstate_bv & xst_flags)
                            == xst_flags);
+                       fxs = &xst.xs_fxsave;
                        break;
                }
-
-               fxs = &xst.xs_fxsave;
-               break;
+               unlink(core_path);
        }
 
 #if defined(__x86_64__)
@@ -3045,6 +3112,7 @@
 
        switch (regmode) {
        case TEST_GETREGS:
+       case TEST_COREDUMP:
                switch (regs) {
                case GPREGS_32:
 #if defined(__i386__)
@@ -3412,12 +3480,16 @@
 X86_REGISTER_TEST(x86_gpregs32_write, TEST_GPREGS, GPREGS_32, TEST_SETREGS,
     "Test writing basic 32-bit gp registers into debugged program "
     "via PT_SETREGS.");
+X86_REGISTER_TEST(x86_gpregs32_core, TEST_GPREGS, GPREGS_32, TEST_COREDUMP,
+    "Test reading basic 32-bit gp registers from core dump.");
 X86_REGISTER_TEST(x86_gpregs32_ebp_esp_read, TEST_GPREGS, GPREGS_32_EBP_ESP,
     TEST_GETREGS, "Test reading ebp & esp registers from debugged program "
     "via PT_GETREGS.");
 X86_REGISTER_TEST(x86_gpregs32_ebp_esp_write, TEST_GPREGS, GPREGS_32_EBP_ESP,
     TEST_SETREGS, "Test writing ebp & esp registers into debugged program "
     "via PT_SETREGS.");
+X86_REGISTER_TEST(x86_gpregs32_ebp_esp_core, TEST_GPREGS, GPREGS_32_EBP_ESP,
+    TEST_COREDUMP, "Test reading ebp & esp registers from core dump.");
 
 X86_REGISTER_TEST(x86_gpregs64_read, TEST_GPREGS, GPREGS_64, TEST_GETREGS,
     "Test reading basic 64-bit gp registers from debugged program "
@@ -3425,11 +3497,15 @@
 X86_REGISTER_TEST(x86_gpregs64_write, TEST_GPREGS, GPREGS_64, TEST_SETREGS,
     "Test writing basic 64-bit gp registers into debugged program "
     "via PT_SETREGS.");
+X86_REGISTER_TEST(x86_gpregs64_core, TEST_GPREGS, GPREGS_64, TEST_COREDUMP,
+    "Test reading basic 64-bit gp registers from core dump.");
 X86_REGISTER_TEST(x86_gpregs64_r8_read, TEST_GPREGS, GPREGS_64_R8, TEST_GETREGS,
     "Test reading r8..r15 registers from debugged program via PT_GETREGS.");
 X86_REGISTER_TEST(x86_gpregs64_r8_write, TEST_GPREGS, GPREGS_64_R8,
     TEST_SETREGS, "Test writing r8..r15 registers into debugged program "
     "via PT_SETREGS.");
+X86_REGISTER_TEST(x86_gpregs64_r8_core, TEST_GPREGS, GPREGS_64_R8,
+    TEST_COREDUMP, "Test reading r8..r15 registers from core dump.");
 
 X86_REGISTER_TEST(x86_fpregs_mm_read, TEST_FPREGS, FPREGS_MM, TEST_GETREGS,
     "Test reading mm0..mm7 registers from debugged program "
@@ -3437,12 +3513,16 @@
 X86_REGISTER_TEST(x86_fpregs_mm_write, TEST_FPREGS, FPREGS_MM, TEST_SETREGS,
     "Test writing mm0..mm7 registers into debugged program "
     "via PT_SETFPREGS.");
+X86_REGISTER_TEST(x86_fpregs_mm_core, TEST_FPREGS, FPREGS_MM, TEST_COREDUMP,
+    "Test reading mm0..mm7 registers from coredump.");
 X86_REGISTER_TEST(x86_fpregs_xmm_read, TEST_XMMREGS, FPREGS_XMM, TEST_GETREGS,
     "Test reading xmm0..xmm15 (..xmm7 on i386) from debugged program "
     "via PT_GETFPREGS (PT_GETXMMREGS on i386).");
 X86_REGISTER_TEST(x86_fpregs_xmm_write, TEST_XMMREGS, FPREGS_XMM, TEST_SETREGS,
     "Test writing xmm0..xmm15 (..xmm7 on i386) into debugged program "
     "via PT_SETFPREGS (PT_SETXMMREGS on i386).");
+X86_REGISTER_TEST(x86_fpregs_xmm_core, TEST_XMMREGS, FPREGS_XMM, TEST_COREDUMP,
+    "Test reading xmm0..xmm15 (..xmm7 on i386) from coredump.");
 
 X86_REGISTER_TEST(x86_xstate_mm_read, TEST_XSTATE, FPREGS_MM, TEST_GETREGS,
     "Test reading mm0..mm7 registers from debugged program "
@@ -3450,18 +3530,24 @@
 X86_REGISTER_TEST(x86_xstate_mm_write, TEST_XSTATE, FPREGS_MM, TEST_SETREGS,
     "Test writing mm0..mm7 registers into debugged program "
     "via PT_SETXSTATE.");
+X86_REGISTER_TEST(x86_xstate_mm_core, TEST_XSTATE, FPREGS_MM, TEST_COREDUMP,
+    "Test reading mm0..mm7 registers from core dump via XSTATE note.");
 X86_REGISTER_TEST(x86_xstate_xmm_read, TEST_XSTATE, FPREGS_XMM, TEST_GETREGS,
     "Test reading xmm0..xmm15 (..xmm7 on i386) from debugged program "
     "via PT_GETXSTATE.");
 X86_REGISTER_TEST(x86_xstate_xmm_write, TEST_XSTATE, FPREGS_XMM, TEST_SETREGS,
     "Test writing xmm0..xmm15 (..xmm7 on i386) into debugged program "
     "via PT_SETXSTATE.");
+X86_REGISTER_TEST(x86_xstate_xmm_core, TEST_XSTATE, FPREGS_XMM, TEST_COREDUMP,
+    "Test reading xmm0..xmm15 (..xmm7 on i386) from coredump via XSTATE note.");
 X86_REGISTER_TEST(x86_xstate_ymm_read, TEST_XSTATE, FPREGS_YMM, TEST_GETREGS,
     "Test reading ymm0..ymm15 (..ymm7 on i386) from debugged program "
     "via PT_GETXSTATE.");
 X86_REGISTER_TEST(x86_xstate_ymm_write, TEST_XSTATE, FPREGS_YMM, TEST_SETREGS,
     "Test writing ymm0..ymm15 (..ymm7 on i386) into debugged program "
     "via PT_SETXSTATE.");
+X86_REGISTER_TEST(x86_xstate_ymm_core, TEST_XSTATE, FPREGS_YMM, TEST_COREDUMP,
+    "Test reading ymm0..ymm15 (..ymm7 on i386) from coredump via XSTATE note.");
 
 /// ----------------------------------------------------------------------------
 
@@ -3530,22 +3616,31 @@
        ATF_TP_ADD_TC_HAVE_DBREGS(tp, x86_cve_2018_8897); \
        ATF_TP_ADD_TC(tp, x86_gpregs32_read); \
        ATF_TP_ADD_TC(tp, x86_gpregs32_write); \
+       ATF_TP_ADD_TC(tp, x86_gpregs32_core); \
        ATF_TP_ADD_TC(tp, x86_gpregs32_ebp_esp_read); \
        ATF_TP_ADD_TC(tp, x86_gpregs32_ebp_esp_write); \
+       ATF_TP_ADD_TC(tp, x86_gpregs32_ebp_esp_core); \



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