[PATCH] ntdll: Restore non-volatile registers in call_user_exception_dispatcher() on x86_64.
Required to correctly restore non-volatile registers during unwind. Signed-off-by: Paul Gofman <pgofman(a)codeweavers.com> --- dlls/ntdll/tests/exception.c | 56 +++++++++++++++++++++++++++---- dlls/ntdll/unix/signal_x86_64.c | 59 +++++++++++++++++++++++---------- 2 files changed, 91 insertions(+), 24 deletions(-) diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c index b2331b739ac..47b4c6a8918 100644 --- a/dlls/ntdll/tests/exception.c +++ b/dlls/ntdll/tests/exception.c @@ -56,6 +56,7 @@ static void * (WINAPI *pRtlLocateExtendedFeature)(CONTEXT_EX *context_ex, ULO static void * (WINAPI *pRtlLocateLegacyContext)(CONTEXT_EX *context_ex, ULONG *length); static void (WINAPI *pRtlSetExtendedFeaturesMask)(CONTEXT_EX *context_ex, ULONG64 feature_mask); static ULONG64 (WINAPI *pRtlGetExtendedFeaturesMask)(CONTEXT_EX *context_ex); +static NTSTATUS (WINAPI *pNtRaiseException)(EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance); static NTSTATUS (WINAPI *pNtReadVirtualMemory)(HANDLE, const void*, void*, SIZE_T, SIZE_T*); static NTSTATUS (WINAPI *pNtTerminateProcess)(HANDLE handle, LONG exit_code); static NTSTATUS (WINAPI *pNtQueryInformationProcess)(HANDLE, PROCESSINFOCLASS, PVOID, ULONG, PULONG); @@ -3716,6 +3717,8 @@ static struct } test_kiuserexceptiondispatcher_regs; +static ULONG64 test_kiuserexceptiondispatcher_saved_r12; + static DWORD dbg_except_continue_handler(EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher) { @@ -3738,6 +3741,13 @@ static LONG WINAPI dbg_except_continue_vectored_handler(struct _EXCEPTION_POINTE trace("dbg_except_continue_vectored_handler, code %#x, Rip %#lx.\n", rec->ExceptionCode, context->Rip); + if (rec->ExceptionCode == 0xceadbeef) + { + ok(context->P1Home == (ULONG64)0xdeadbeeffeedcafe, "Got unexpected context->P1Home %#lx.\n", context->P1Home); + context->R12 = test_kiuserexceptiondispatcher_saved_r12; + return EXCEPTION_CONTINUE_EXECUTION; + } + ok(rec->ExceptionCode == 0x80000003, "Got unexpected exception code %#x.\n", rec->ExceptionCode); got_exception = 1; @@ -3760,7 +3770,7 @@ void WINAPI hook_KiUserExceptionDispatcher(EXCEPTION_RECORD *rec, CONTEXT *conte hook_called = TRUE; /* Broken on Win2008, probably rec offset in stack is different. */ - ok(rec->ExceptionCode == 0x80000003 || broken(!rec->ExceptionCode), + ok(rec->ExceptionCode == 0x80000003 || rec->ExceptionCode == 0xceadbeef || broken(!rec->ExceptionCode), "Got unexpected ExceptionCode %#x.\n", rec->ExceptionCode); hook_KiUserExceptionDispatcher_rip = (void *)context->Rip; @@ -3769,7 +3779,7 @@ void WINAPI hook_KiUserExceptionDispatcher(EXCEPTION_RECORD *rec, CONTEXT *conte sizeof(saved_KiUserExceptionDispatcher_bytes)); } -static void test_kiuserexceptiondispatcher(void) + void test_kiuserexceptiondispatcher(void) { LPVOID vectored_handler; HMODULE hntdll = GetModuleHandleA("ntdll.dll"); @@ -3810,15 +3820,15 @@ static void test_kiuserexceptiondispatcher(void) 0x48, 0x89, 0xe2, /* mov %rsp,%rdx */ 0x48, 0x8d, 0x8c, 0x24, 0xf0, 0x04, 0x00, 0x00, /* lea 0x4f0(%rsp),%rcx */ - + 0x4c, 0x89, 0x22, /* mov %r12,(%rdx) */ 0xff, 0x14, 0x25, - /* offset: 14 bytes */ + /* offset: 17 bytes */ 0x00, 0x00, 0x00, 0x00, /* callq *addr */ /* call hook implementation. */ 0x48, 0x31, 0xc9, /* xor %rcx, %rcx */ 0x48, 0x31, 0xd2, /* xor %rdx, %rdx */ 0xff, 0x24, 0x25, - /* offset: 27 bytes */ + /* offset: 30 bytes */ 0x00, 0x00, 0x00, 0x00, /* jmpq *addr */ /* jump to original function. */ }; @@ -3827,6 +3837,8 @@ static void test_kiuserexceptiondispatcher(void) DWORD old_protect1, old_protect2; EXCEPTION_RECORD record; void *bpt_address; + CONTEXT ctx; + LONG pass; BYTE *ptr; BOOL ret; @@ -3845,8 +3857,8 @@ static void test_kiuserexceptiondispatcher(void) ok(((ULONG64)&pKiUserExceptionDispatcher & 0xffffffff) == ((ULONG64)&pKiUserExceptionDispatcher), "Address is too long.\n"); - *(unsigned int *)(hook_trampoline + 14) = (unsigned int)(ULONG_PTR)&phook_KiUserExceptionDispatcher; - *(unsigned int *)(hook_trampoline + 27) = (unsigned int)(ULONG_PTR)&pKiUserExceptionDispatcher; + *(unsigned int *)(hook_trampoline + 17) = (unsigned int)(ULONG_PTR)&phook_KiUserExceptionDispatcher; + *(unsigned int *)(hook_trampoline + 30) = (unsigned int)(ULONG_PTR)&pKiUserExceptionDispatcher; ret = VirtualProtect(hook_trampoline, ARRAY_SIZE(hook_trampoline), PAGE_EXECUTE_READWRITE, &old_protect1); ok(ret, "Got unexpected ret %#x, GetLastError() %u.\n", ret, GetLastError()); @@ -3954,6 +3966,35 @@ static void test_kiuserexceptiondispatcher(void) NtCurrentTeb()->Peb->BeingDebugged = 0; + vectored_handler = AddVectoredExceptionHandler(TRUE, dbg_except_continue_vectored_handler); + pass = 0; + InterlockedIncrement(&pass); + pRtlCaptureContext(&ctx); + if (InterlockedIncrement(&pass) == 2) /* interlocked to prevent compiler from moving before capture */ + { + memcpy(pKiUserExceptionDispatcher, patched_KiUserExceptionDispatcher_bytes, + sizeof(patched_KiUserExceptionDispatcher_bytes)); + got_exception = 0; + hook_called = FALSE; + + record.ExceptionCode = 0xceadbeef; + test_kiuserexceptiondispatcher_saved_r12 = ctx.R12; + ctx.R12 = (ULONG64)0xdeadbeeffeedcafe; + +#ifdef __GNUC__ + /* Spoil r12 value to make sure it doesn't come from the current userspace registers. */ + __asm__ volatile("movq $0xdeadcafe, %%r12" : : : "%r12"); +#endif + pNtRaiseException(&record, &ctx, TRUE); + ok(0, "Shouldn't be reached.\n"); + } + else + { + ok(pass == 3, "Got unexpected pass %d.\n", pass); + } + ok(hook_called, "Hook was not called.\n"); + RemoveVectoredExceptionHandler(vectored_handler); + ret = VirtualProtect(pKiUserExceptionDispatcher, sizeof(saved_KiUserExceptionDispatcher_bytes), old_protect2, &old_protect2); ok(ret, "Got unexpected ret %#x, GetLastError() %u.\n", ret, GetLastError()); @@ -8046,6 +8087,7 @@ START_TEST(exception) X(NtQueryInformationThread); X(NtSetInformationProcess); X(NtSuspendProcess); + X(NtRaiseException); X(NtResumeProcess); X(RtlGetUnloadEventTrace); X(RtlGetUnloadEventTraceEx); diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index 124032714c7..8cdf129f5cc 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -1551,6 +1551,34 @@ static void restore_context( const struct xcontext *xcontext, ucontext_t *sigcon } +/*********************************************************************** + * set_nonvolatile_regs_from_context + * + * Set the non-volatile registers from CPU context. + */ +extern void set_nonvolatile_regs_from_context( const CONTEXT *context ); +__ASM_GLOBAL_FUNC( set_nonvolatile_regs_from_context, + "movq 0xa0(%rcx),%rbp\n\t" + "movq 0x90(%rcx),%rbx\n\t" + "movq 0xa8(%rcx),%rsi\n\t" + "movq 0xb0(%rcx),%rdi\n\t" + "movq 0xd8(%rcx),%r12\n\t" + "movq 0xe0(%rcx),%r13\n\t" + "movq 0xe8(%rcx),%r14\n\t" + "movq 0xf0(%rcx),%r15\n\t" + "movdqa 0x200(%rcx),%xmm6\n\t" + "movdqa 0x210(%rcx),%xmm7\n\t" + "movdqa 0x220(%rcx),%xmm8\n\t" + "movdqa 0x230(%rcx),%xmm9\n\t" + "movdqa 0x240(%rcx),%xmm10\n\t" + "movdqa 0x250(%rcx),%xmm11\n\t" + "movdqa 0x260(%rcx),%xmm12\n\t" + "movdqa 0x270(%rcx),%xmm13\n\t" + "movdqa 0x280(%rcx),%xmm14\n\t" + "movdqa 0x290(%rcx),%xmm15\n\t" + "ret" ); + + /*********************************************************************** * set_full_cpu_context * @@ -2081,19 +2109,7 @@ __ASM_GLOBAL_FUNC( call_raise_user_exception_dispatcher, /*********************************************************************** * call_user_exception_dispatcher */ - -extern void WINAPI user_exception_dispatcher_trampoline( struct stack_layout *stack, - void *pKiUserExceptionDispatcher ); - -__ASM_GLOBAL_FUNC( user_exception_dispatcher_trampoline, - "movq %rcx,%rsp\n\t" - "movq 0x98(%rsp),%rcx\n\t" /* context->Rsp */ - "movq 0xa0(%rsp),%rbp\n\t" - "movq 0xa8(%rsp),%rsi\n\t" - "movq 0xb0(%rsp),%rdi\n\t" - "jmpq *%rdx") - -void WINAPI do_call_user_exception_dispatcher( EXCEPTION_RECORD *rec, CONTEXT *context, +struct stack_layout * WINAPI setup_user_exception_dispatcher_stack( EXCEPTION_RECORD *rec, CONTEXT *context, NTSTATUS (WINAPI *dispatcher)(EXCEPTION_RECORD*,CONTEXT*), struct stack_layout *stack ) { @@ -2127,12 +2143,13 @@ void WINAPI do_call_user_exception_dispatcher( EXCEPTION_RECORD *rec, CONTEXT *c /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */ if (stack->rec.ExceptionCode == EXCEPTION_BREAKPOINT) stack->context.Rip--; - amd64_thread_data()->syscall_frame = NULL; - user_exception_dispatcher_trampoline( stack, dispatcher ); + return stack; } __ASM_GLOBAL_FUNC( call_user_exception_dispatcher, - "movq 0x98(%rdx),%r9\n\t" /* context->Rsp */ + "movq %gs:0x30,%rax\n\t" + "movq $0,0x328(%rax)\n\t" /* amd64_thread_data()->syscall_frame */ + "movq 0x98(%rdx),%r9\n\t" /* context->Rsp */ "andq $~0xf,%r9\n\t" "btl $6,0x30(%rdx)\n\t" /* context->ContextFlags, CONTEXT_XSTATE bit. */ "jnc 1f\n\t" @@ -2141,7 +2158,15 @@ __ASM_GLOBAL_FUNC( call_user_exception_dispatcher, "1:\tsubq $0x5b0,%r9\n\t" /* sizeof(struct stack_layout) */ "cmpq %rsp,%r9\n\t" "cmovbq %r9,%rsp\n\t" - "jmp " __ASM_NAME("do_call_user_exception_dispatcher") "\n\t") + "pushq %r8\n\t" + "subq $0x20,%rsp\n\t" + "call " __ASM_NAME("setup_user_exception_dispatcher_stack") "\n\t" + "mov %rax,%rcx\n\t" + "call " __ASM_NAME("set_nonvolatile_regs_from_context") "\n\t" + "addq $0x20,%rsp\n\t" + "popq %r8\n\t" + "mov %rcx,%rsp\n\t" + "jmpq *%r8") /*********************************************************************** * is_privileged_instr -- 2.26.2
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Paul Gofman