__fastfail() is used by the Visual C++ runtime and Windows system libraries to signal that the in-process state is corrupted and unrecoverable.
If __fastfail() is invoked, the NT kernel raises a second-chance non-continuable exception STATUS_STACK_BUFFER_OVERRUN. This quickly terminates the process, bypassing all in-process exception handlers (since they all rely on the potentially corrupted process state).
Signed-off-by: Jinoh Kang jinoh.kang.kr@gmail.com ---
Notes: v3 -> v4: fix BRK #0xF003 detection on ARM64 add comments v4 -> v5: use NtRaiseException()
dlls/ntdll/tests/exception.c | 1 - dlls/ntdll/unix/signal_arm.c | 40 +++++++++++++++++++++++++++++++-- dlls/ntdll/unix/signal_arm64.c | 40 +++++++++++++++++++++++++++++++++ dlls/ntdll/unix/signal_i386.c | 38 ++++++++++++++++++++++++++++++- dlls/ntdll/unix/signal_x86_64.c | 35 +++++++++++++++++++++++++++++ 5 files changed, 150 insertions(+), 4 deletions(-)
diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c index c0d3ae19a51..14b1396dbc2 100644 --- a/dlls/ntdll/tests/exception.c +++ b/dlls/ntdll/tests/exception.c @@ -8429,7 +8429,6 @@ static void subtest_fastfail(unsigned int code)
} while (de.dwDebugEventCode != EXIT_PROCESS_DEBUG_EVENT);
- todo_wine ok(had_ff || broken(had_se) /* Win7 */, "fast fail did not occur\n");
wait_child_process( pi.hProcess ); diff --git a/dlls/ntdll/unix/signal_arm.c b/dlls/ntdll/unix/signal_arm.c index ebc08984adf..072e402f68b 100644 --- a/dlls/ntdll/unix/signal_arm.c +++ b/dlls/ntdll/unix/signal_arm.c @@ -614,6 +614,32 @@ static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) }
+/*********************************************************************** + * raise_second_chance_exception + * + * Raise a second chance exception. + */ +static void raise_second_chance_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) +{ + CONTEXT context; + + rec->ExceptionAddress = (void *)PC_sig(sigcontext); + if (is_inside_syscall( sigcontext )) + { + /* Windows would bug check here */ + ERR("Direct second chance exception code %x flags %x addr %p (inside syscall)\n", + rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); + NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode ); + } + else + { + save_context( &context, sigcontext ); + NtRaiseException( rec, &context, FALSE ); + restore_context( &context, sigcontext ); + } +} + + /*********************************************************************** * call_user_apc_dispatcher */ @@ -803,13 +829,23 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext ) switch (get_trap_code(signal, context)) { case TRAP_ARM_PRIVINFLT: /* Invalid opcode exception */ - if (*(WORD *)PC_sig(context) == 0xdefe) /* breakpoint */ + switch (*(WORD *)PC_sig(context)) { + case 0xdefb: /* __fastfail */ + rec.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN; + rec.ExceptionFlags = EH_NONCONTINUABLE; + rec.NumberParameters = 1; + rec.ExceptionInformation[0] = REGn_sig( 0, context ); + raise_second_chance_exception( context, &rec ); + return; + case 0xdefe: /* breakpoint */ rec.ExceptionCode = EXCEPTION_BREAKPOINT; rec.NumberParameters = 1; break; + default: + rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; + break; } - rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; break; case TRAP_ARM_PAGEFLT: /* Page fault */ rec.NumberParameters = 2; diff --git a/dlls/ntdll/unix/signal_arm64.c b/dlls/ntdll/unix/signal_arm64.c index f2612412366..ad19a9d5ca7 100644 --- a/dlls/ntdll/unix/signal_arm64.c +++ b/dlls/ntdll/unix/signal_arm64.c @@ -655,6 +655,32 @@ static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) }
+/*********************************************************************** + * raise_second_chance_exception + * + * Raise a second chance exception. + */ +static void raise_second_chance_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) +{ + CONTEXT context; + + rec->ExceptionAddress = (void *)PC_sig(sigcontext); + if (is_inside_syscall( sigcontext )) + { + /* Windows would bug check here */ + ERR("Direct second chance exception code %x flags %x addr %p (inside syscall)\n", + rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); + NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode ); + } + else + { + save_context( &context, sigcontext ); + NtRaiseException( rec, &context, FALSE ); + restore_context( &context, sigcontext ); + } +} + + /*********************************************************************** * call_user_apc_dispatcher */ @@ -899,6 +925,7 @@ static void bus_handler( int signal, siginfo_t *siginfo, void *sigcontext ) static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { EXCEPTION_RECORD rec = { 0 }; + ucontext_t *context = sigcontext;
switch (siginfo->si_code) { @@ -907,6 +934,19 @@ static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext ) break; case TRAP_BRKPT: default: + /* debug exceptions do not update ESR on Linux, so we fetch the instruction directly. */ + if (!(PSTATE_sig( context ) & 0x10) && /* AArch64 (not WoW) */ + !(PC_sig( context ) & 3) && + *(ULONG *)PC_sig( context ) == 0xd43e0060UL) /* brk #0xf003 */ + { + /* __fastfail */ + rec.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN; + rec.ExceptionFlags = EH_NONCONTINUABLE; + rec.NumberParameters = 1; + rec.ExceptionInformation[0] = REGn_sig( 0, context ); + raise_second_chance_exception( context, &rec ); + return; + } rec.ExceptionCode = EXCEPTION_BREAKPOINT; rec.NumberParameters = 1; break; diff --git a/dlls/ntdll/unix/signal_i386.c b/dlls/ntdll/unix/signal_i386.c index bf3abc1a587..d0780403f8a 100644 --- a/dlls/ntdll/unix/signal_i386.c +++ b/dlls/ntdll/unix/signal_i386.c @@ -1485,6 +1485,30 @@ static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) setup_raise_exception( sigcontext, stack, rec, &xcontext ); }
+/*********************************************************************** + * raise_second_chance_exception + * + * Raise a second chance exception. + */ +static void raise_second_chance_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec, struct xcontext *xcontext ) +{ + rec->ExceptionAddress = (void *)EIP_sig( sigcontext ); + if (is_inside_syscall( sigcontext )) + { + /* Windows would bug check here */ + WINE_ERR("Direct second chance exception code %x flags %x addr %p (inside syscall)\n", + rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); + NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode ); + } + else + { + save_context( xcontext, sigcontext ); + NtRaiseException( rec, &xcontext->c, FALSE ); + restore_context( xcontext, sigcontext ); + } +} + + /* stack layout when calling an user apc function. * FIXME: match Windows ABI. */ struct apc_stack_layout @@ -1772,8 +1796,20 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext ) EXCEPTION_RECORD rec = { 0 }; struct xcontext xcontext; ucontext_t *ucontext = sigcontext; - void *stack = setup_exception_record( sigcontext, &rec, &xcontext ); + void *stack;
+ if (TRAP_sig(ucontext) == TRAP_x86_PROTFLT && ERROR_sig(ucontext) == ((0x29 << 3) | 2)) + { + /* __fastfail: process state is corrupted - skip setup_exception_record */ + rec.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN; + rec.ExceptionFlags = EH_NONCONTINUABLE; + rec.NumberParameters = 1; + rec.ExceptionInformation[0] = ECX_sig( ucontext ); + raise_second_chance_exception( ucontext, &rec, &xcontext ); + return; + } + + stack = setup_exception_record( sigcontext, &rec, &xcontext ); switch (TRAP_sig(ucontext)) { case TRAP_x86_OFLOW: /* Overflow exception */ diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index d32e38875a4..ec1e461fbc0 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -2197,6 +2197,30 @@ static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec ) }
+/*********************************************************************** + * raise_second_chance_exception + * + * Raise a second chance exception. + */ +static void raise_second_chance_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec, struct xcontext *xcontext ) +{ + rec->ExceptionAddress = (void *)RIP_sig(sigcontext); + if (is_inside_syscall( sigcontext )) + { + /* Windows would bug check here */ + ERR("Direct second chance exception code %x flags %x addr %p (inside syscall)\n", + rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); + NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode ); + } + else + { + save_context( xcontext, sigcontext ); + NtRaiseException( rec, &xcontext->c, FALSE ); + restore_context( xcontext, sigcontext ); + } +} + + /*********************************************************************** * call_user_apc_dispatcher */ @@ -2551,6 +2575,17 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext ) struct xcontext context; ucontext_t *ucontext = sigcontext;
+ if (TRAP_sig(ucontext) == TRAP_x86_PROTFLT && ERROR_sig(ucontext) == ((0x29 << 3) | 2)) + { + /* __fastfail: process state is corrupted */ + rec.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN; + rec.ExceptionFlags = EH_NONCONTINUABLE; + rec.NumberParameters = 1; + rec.ExceptionInformation[0] = RCX_sig( ucontext ); + raise_second_chance_exception( ucontext, &rec, &context ); + return; + } + rec.ExceptionAddress = (void *)RIP_sig(ucontext); save_context( &context, sigcontext );