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Add an assert-based segfault handler to etc.linux.memoryerror (#20643)

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* Add an assert-based segfault handler to `etc.linux.memoryerror`

* Commit memoryAssertError review feedback

* Indent the MemoryErrorSupported version block

* Fix a bad ucontext_t in memoryerror.d

* Fix bad imports in memoryerror.d

* Use a module-scope version: in memoryerror.d

* Add a memoryerror.d unittest

* Prefer version-else-version... in memoryerror.d
This commit is contained in:
Jonas Meeuws 2025-01-18 22:38:54 +01:00 • committed by GitHub
parent e49b67e969
commit d115713410
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8 changed files with 552 additions and 298 deletions
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65
changelog/druntime.segfault-message.dd Normal file
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@ -0,0 +1,65 @@
New segfault handler showing backtraces for null access / call stack overflow on linux
While buffer overflows are usually caught by array bounds checks, there are still other situations where a segmentation fault occurs in D programs:
- `null` pointer dereference
- Corrupted or dangling pointer dereference in `@system` code
- Call stack overflow (infinite recursion)
These result in an uninformative runtime error such as:
$(CONSOLE
[1] 37856 segmentation fault (core dumped) ./app
)
In order to find the cause of the error, the program needs to be run again in a debugger like gdb.
There is the `registerMemoryErrorHandler` function in `etc.linux.memoryerror`, which catches `SIGSEGV` signals and transforms them into a thrown `InvalidPointerError`, providing a better message.
However, it doesn't work on call stack overflow, because it uses stack memory itself, so the segfault handler segfaults.
It also relies on inline assembly, limiting it to the x86 architecture.
A new function `registerMemoryAssertHandler` has been introduced, which does handle stack overflow by setting up an [altstack](https://man7.org/linux/man-pages/man2/sigaltstack.2.html).
It uses `assert(0)` instead of throwing an `Error` object, so the result corresponds to the chosen `-checkaction=[D|C|halt|context]` setting.
Example:
---
void main()
{
version (linux)
{
import etc.linux.memoryerror;
registerMemoryAssertHandler();
}
int* p = null;
int* q = cast(int*) 0xDEADBEEF;
// int a = *p; // segmentation fault: null pointer read/write operation
// int b = *q; // segmentation fault: invalid pointer read/write operation
recurse(); // segmentation fault: call stack overflow
}
void recurse()
{
recurse();
}
---
Output with `dmd -g -run app.d`:
$(CONSOLE
core.exception.AssertError@src/etc/linux/memoryerror.d(82): segmentation fault: call stack overflow
$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)$(NDASH)
src/core/exception.d:587 onAssertErrorMsg [0x58e270d2802d]
src/core/exception.d:803 _d_assert_msg [0x58e270d1fb64]
src/etc/linux/memoryerror.d:82 _d_handleSignalAssert [0x58e270d1f48d]
??:? [0x7004139e876f]
./app.d:16 void scratch.recurse() [0x58e270d1d757]
./app.d:18 void scratch.recurse() [0x58e270d1d75c]
./app.d:18 void scratch.recurse() [0x58e270d1d75c]
./app.d:18 void scratch.recurse() [0x58e270d1d75c]
./app.d:18 void scratch.recurse() [0x58e270d1d75c]
...
...
...
)

721
druntime/src/etc/linux/memoryerror.d
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@ -1,9 +1,5 @@
/**
* Handle page protection errors using D errors (exceptions). $(D NullPointerError) is
* thrown when dereferencing null pointers. A system-dependent error is thrown in other
* cases.
*
* Note: Only x86 and x86_64 are supported for now.
* Handle page protection errors using D errors (exceptions) or asserts.
*
* License: Distributed under the
* $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
@ -14,313 +10,444 @@
module etc.linux.memoryerror;
version (CRuntime_Glibc)
version (linux)
{
version (X86)
version = MemoryErrorSupported;
version (X86_64)
version = MemoryErrorSupported;
version (DigitalMars)
{
version (CRuntime_Glibc)
{
version (X86)
version = MemoryErrorSupported;
else version (X86_64)
version = MemoryErrorSupported;
}
}
}
version (MemoryErrorSupported):
@system:
version (linux)
{
version (X86)
version = MemoryAssertSupported;
else version (X86_64)
version = MemoryAssertSupported;
else version (ARM)
version = MemoryAssertSupported;
else version (AArch64)
version = MemoryAssertSupported;
else version (PPC64)
version = MemoryAssertSupported;
}
version (MemoryErrorSupported)
version = AnySupported;
else version (MemoryErrorSupported)
version = AnySupported;
version (AnySupported):
import core.sys.posix.signal : SA_SIGINFO, sigaction, sigaction_t, siginfo_t, SIGSEGV;
import ucontext = core.sys.posix.ucontext;
// Register and unregister memory error handler.
bool registerMemoryErrorHandler() nothrow
version (MemoryAssertSupported)
{
sigaction_t action;
action.sa_sigaction = &handleSignal;
action.sa_flags = SA_SIGINFO;
auto oldptr = &old_sigaction;
return !sigaction(SIGSEGV, &action, oldptr);
import core.sys.posix.signal : SA_ONSTACK, sigaltstack, SIGSTKSZ, stack_t;
}
bool deregisterMemoryErrorHandler() nothrow
{
auto oldptr = &old_sigaction;
return !sigaction(SIGSEGV, oldptr, null);
}
/**
* Thrown on POSIX systems when a SIGSEGV signal is received.
*/
class InvalidPointerError : Error
{
this(string file = __FILE__, size_t line = __LINE__, Throwable next = null) nothrow
{
super("", file, line, next);
}
this(Throwable next, string file = __FILE__, size_t line = __LINE__) nothrow
{
super("", file, line, next);
}
}
/**
* Thrown on null pointer dereferences.
*/
class NullPointerError : InvalidPointerError
{
this(string file = __FILE__, size_t line = __LINE__, Throwable next = null) nothrow
{
super(file, line, next);
}
this(Throwable next, string file = __FILE__, size_t line = __LINE__) nothrow
{
super(file, line, next);
}
}
unittest
{
int* getNull() { return null; }
assert(registerMemoryErrorHandler());
bool b;
try
{
*getNull() = 42;
}
catch (NullPointerError)
{
b = true;
}
assert(b);
b = false;
try
{
*getNull() = 42;
}
catch (InvalidPointerError)
{
b = true;
}
assert(b);
assert(deregisterMemoryErrorHandler());
}
// Signal handler space.
private:
__gshared sigaction_t old_sigaction;
alias typeof(ucontext.ucontext_t.init.uc_mcontext.gregs[0]) RegType;
version (X86_64)
{
static RegType savedRDI, savedRSI;
extern(C)
void handleSignal(int signum, siginfo_t* info, void* contextPtr) nothrow
{
auto context = cast(ucontext.ucontext_t*)contextPtr;
// Save registers into global thread local, to allow recovery.
savedRDI = context.uc_mcontext.gregs[ucontext.REG_RDI];
savedRSI = context.uc_mcontext.gregs[ucontext.REG_RSI];
// Hijack current context so we call our handler.
auto rip = context.uc_mcontext.gregs[ucontext.REG_RIP];
auto addr = cast(RegType) info.si_addr;
context.uc_mcontext.gregs[ucontext.REG_RDI] = addr;
context.uc_mcontext.gregs[ucontext.REG_RSI] = rip;
context.uc_mcontext.gregs[ucontext.REG_RIP] = cast(RegType) ((rip != addr)?&sigsegvDataHandler:&sigsegvCodeHandler);
}
// All handler functions must be called with faulting address in RDI and original RIP in RSI.
// This function is called when the segfault's cause is to call an invalid function pointer.
void sigsegvCodeHandler()
{
asm
{
naked;
// Handle the stack for an invalid function call (segfault at RIP).
// With the return pointer, the stack is now alligned.
push RBP;
mov RBP, RSP;
jmp sigsegvDataHandler;
}
}
void sigsegvDataHandler()
{
asm
{
naked;
push RSI; // return address (original RIP).
push RBP; // old RBP
mov RBP, RSP;
pushfq; // Save flags.
push RAX; // RAX, RCX, RDX, and R8 to R11 are trash registers and must be preserved as local variables.
push RCX;
push RDX;
push R8;
push R9;
push R10;
push R11; // With 10 pushes, the stack is still aligned.
// Parameter address is already set as RAX.
call sigsegvUserspaceProcess;
// Restore RDI and RSI values.
call restoreRDI;
push RAX; // RDI is in RAX. It is pushed and will be poped back to RDI.
call restoreRSI;
mov RSI, RAX;
pop RDI;
// Restore trash registers value.
pop R11;
pop R10;
pop R9;
pop R8;
pop RDX;
pop RCX;
pop RAX;
popfq; // Restore flags.
// Return
pop RBP;
ret;
}
}
// The return value is stored in EAX and EDX, so this function restore the correct value for theses registers.
RegType restoreRDI()
{
return savedRDI;
}
RegType restoreRSI()
{
return savedRSI;
}
}
else version (X86)
{
static RegType savedEAX, savedEDX;
extern(C)
void handleSignal(int signum, siginfo_t* info, void* contextPtr) nothrow
{
auto context = cast(ucontext.ucontext_t*)contextPtr;
// Save registers into global thread local, to allow recovery.
savedEAX = context.uc_mcontext.gregs[ucontext.REG_EAX];
savedEDX = context.uc_mcontext.gregs[ucontext.REG_EDX];
// Hijack current context so we call our handler.
auto eip = context.uc_mcontext.gregs[ucontext.REG_EIP];
auto addr = cast(RegType) info.si_addr;
context.uc_mcontext.gregs[ucontext.REG_EAX] = addr;
context.uc_mcontext.gregs[ucontext.REG_EDX] = eip;
context.uc_mcontext.gregs[ucontext.REG_EIP] = cast(RegType) ((eip != addr)?&sigsegvDataHandler:&sigsegvCodeHandler);
}
// All handler functions must be called with faulting address in EAX and original EIP in EDX.
// This function is called when the segfault's cause is to call an invalid function pointer.
void sigsegvCodeHandler()
{
asm
{
naked;
// Handle the stack for an invalid function call (segfault at EIP).
// 4 bytes are used for function pointer; We need 12 byte to keep stack aligned.
sub ESP, 12;
mov 8[ESP], EBP;
mov EBP, ESP;
jmp sigsegvDataHandler;
}
}
void sigsegvDataHandler()
{
asm
{
naked;
// We jump directly here if we are in a valid function call case.
push EDX; // return address (original EIP).
push EBP; // old EBP
mov EBP, ESP;
pushfd; // Save flags.
push ECX; // ECX is a trash register and must be preserved as local variable.
// 4 pushes have been done. The stack is aligned.
// Parameter address is already set as EAX.
call sigsegvUserspaceProcess;
// Restore register values and return.
call restoreRegisters;
pop ECX;
popfd; // Restore flags.
// Return
pop EBP;
ret;
}
}
// The return value is stored in EAX and EDX, so this function restore the correct value for theses registers.
RegType[2] restoreRegisters()
{
RegType[2] restore;
restore[0] = savedEAX;
restore[1] = savedEDX;
return restore;
}
}
else
{
static assert(false, "Unsupported architecture.");
}
// This should be calculated by druntime.
// TODO: Add a core.memory function for this.
enum PAGE_SIZE = 4096;
@system:
// The first 64Kb are reserved for detecting null pointer dereferences.
enum MEMORY_RESERVED_FOR_NULL_DEREFERENCE = 4096 * 16;
// TODO: this is a platform-specific assumption, can be made more robust
private enum size_t MEMORY_RESERVED_FOR_NULL_DEREFERENCE = 4096 * 16;
// User space handler
void sigsegvUserspaceProcess(void* address)
version (MemoryErrorSupported)
{
// SEGV_MAPERR, SEGV_ACCERR.
// The first page is protected to detect null dereferences.
if ((cast(size_t) address) < MEMORY_RESERVED_FOR_NULL_DEREFERENCE)
/**
* Register memory error handler, store the old handler.
*
* `NullPointerError` is thrown when dereferencing null pointers.
* A generic `InvalidPointerError` error is thrown in other cases.
*
* Returns: whether the registration was successful
*
* Limitations: Only x86 and x86_64 are supported for now.
*/
bool registerMemoryErrorHandler() nothrow
{
throw new NullPointerError();
sigaction_t action;
action.sa_sigaction = &handleSignal;
action.sa_flags = SA_SIGINFO;
auto oldptr = &oldSigactionMemoryError;
return !sigaction(SIGSEGV, &action, oldptr);
}
throw new InvalidPointerError();
/**
* Revert the memory error handler back to the one from before calling `registerMemoryErrorHandler()`.
*
* Returns: whether the registration of the old handler was successful
*/
bool deregisterMemoryErrorHandler() nothrow
{
auto oldptr = &oldSigactionMemoryError;
return !sigaction(SIGSEGV, oldptr, null);
}
/**
* Thrown on POSIX systems when a SIGSEGV signal is received.
*/
class InvalidPointerError : Error
{
this(string file = __FILE__, size_t line = __LINE__, Throwable next = null) nothrow
{
super("", file, line, next);
}
this(Throwable next, string file = __FILE__, size_t line = __LINE__) nothrow
{
super("", file, line, next);
}
}
/**
* Thrown on null pointer dereferences.
*/
class NullPointerError : InvalidPointerError
{
this(string file = __FILE__, size_t line = __LINE__, Throwable next = null) nothrow
{
super(file, line, next);
}
this(Throwable next, string file = __FILE__, size_t line = __LINE__) nothrow
{
super(file, line, next);
}
}
unittest
{
int* getNull() { return null; }
assert(registerMemoryErrorHandler());
bool b;
try
{
*getNull() = 42;
}
catch (NullPointerError)
{
b = true;
}
assert(b);
b = false;
try
{
*getNull() = 42;
}
catch (InvalidPointerError)
{
b = true;
}
assert(b);
assert(deregisterMemoryErrorHandler());
}
// Signal handler space.
private:
__gshared sigaction_t oldSigactionMemoryError;
alias RegType = typeof(ucontext.ucontext_t.init.uc_mcontext.gregs[0]);
version (X86_64)
{
static RegType savedRDI, savedRSI;
extern(C)
void handleSignal(int signum, siginfo_t* info, void* contextPtr) nothrow
{
auto context = cast(ucontext.ucontext_t*)contextPtr;
// Save registers into global thread local, to allow recovery.
savedRDI = context.uc_mcontext.gregs[ucontext.REG_RDI];
savedRSI = context.uc_mcontext.gregs[ucontext.REG_RSI];
// Hijack current context so we call our handler.
auto rip = context.uc_mcontext.gregs[ucontext.REG_RIP];
auto addr = cast(RegType) info.si_addr;
context.uc_mcontext.gregs[ucontext.REG_RDI] = addr;
context.uc_mcontext.gregs[ucontext.REG_RSI] = rip;
context.uc_mcontext.gregs[ucontext.REG_RIP] = cast(RegType) ((rip != addr)?&sigsegvDataHandler:&sigsegvCodeHandler);
}
// All handler functions must be called with faulting address in RDI and original RIP in RSI.
// This function is called when the segfault's cause is to call an invalid function pointer.
void sigsegvCodeHandler()
{
asm
{
naked;
// Handle the stack for an invalid function call (segfault at RIP).
// With the return pointer, the stack is now alligned.
push RBP;
mov RBP, RSP;
jmp sigsegvDataHandler;
}
}
void sigsegvDataHandler()
{
asm
{
naked;
push RSI; // return address (original RIP).
push RBP; // old RBP
mov RBP, RSP;
pushfq; // Save flags.
push RAX; // RAX, RCX, RDX, and R8 to R11 are trash registers and must be preserved as local variables.
push RCX;
push RDX;
push R8;
push R9;
push R10;
push R11; // With 10 pushes, the stack is still aligned.
// Parameter address is already set as RAX.
call sigsegvUserspaceProcess;
// Restore RDI and RSI values.
call restoreRDI;
push RAX; // RDI is in RAX. It is pushed and will be poped back to RDI.
call restoreRSI;
mov RSI, RAX;
pop RDI;
// Restore trash registers value.
pop R11;
pop R10;
pop R9;
pop R8;
pop RDX;
pop RCX;
pop RAX;
popfq; // Restore flags.
// Return
pop RBP;
ret;
}
}
// The return value is stored in EAX and EDX, so this function restore the correct value for theses registers.
RegType restoreRDI()
{
return savedRDI;
}
RegType restoreRSI()
{
return savedRSI;
}
}
else version (X86)
{
static RegType savedEAX, savedEDX;
extern(C)
void handleSignal(int signum, siginfo_t* info, void* contextPtr) nothrow
{
auto context = cast(ucontext.ucontext_t*)contextPtr;
// Save registers into global thread local, to allow recovery.
savedEAX = context.uc_mcontext.gregs[ucontext.REG_EAX];
savedEDX = context.uc_mcontext.gregs[ucontext.REG_EDX];
// Hijack current context so we call our handler.
auto eip = context.uc_mcontext.gregs[ucontext.REG_EIP];
auto addr = cast(RegType) info.si_addr;
context.uc_mcontext.gregs[ucontext.REG_EAX] = addr;
context.uc_mcontext.gregs[ucontext.REG_EDX] = eip;
context.uc_mcontext.gregs[ucontext.REG_EIP] = cast(RegType) ((eip != addr)?&sigsegvDataHandler:&sigsegvCodeHandler);
}
// All handler functions must be called with faulting address in EAX and original EIP in EDX.
// This function is called when the segfault's cause is to call an invalid function pointer.
void sigsegvCodeHandler()
{
asm
{
naked;
// Handle the stack for an invalid function call (segfault at EIP).
// 4 bytes are used for function pointer; We need 12 byte to keep stack aligned.
sub ESP, 12;
mov [ESP + 8], EBP;
mov EBP, ESP;
jmp sigsegvDataHandler;
}
}
void sigsegvDataHandler()
{
asm
{
naked;
// We jump directly here if we are in a valid function call case.
push EDX; // return address (original EIP).
push EBP; // old EBP
mov EBP, ESP;
pushfd; // Save flags.
push ECX; // ECX is a trash register and must be preserved as local variable.
// 4 pushes have been done. The stack is aligned.
// Parameter address is already set as EAX.
call sigsegvUserspaceProcess;
// Restore register values and return.
call restoreRegisters;
pop ECX;
popfd; // Restore flags.
// Return
pop EBP;
ret;
}
}
// The return value is stored in EAX and EDX, so this function restore the correct value for theses registers.
RegType[2] restoreRegisters()
{
RegType[2] restore;
restore[0] = savedEAX;
restore[1] = savedEDX;
return restore;
}
}
else
{
static assert(false, "Unsupported architecture.");
}
// User space handler
void sigsegvUserspaceProcess(void* address)
{
// SEGV_MAPERR, SEGV_ACCERR.
// The first page is protected to detect null dereferences.
if ((cast(size_t) address) < MEMORY_RESERVED_FOR_NULL_DEREFERENCE)
{
throw new NullPointerError();
}
throw new InvalidPointerError();
}
}
version (MemoryAssertSupported)
{
private __gshared sigaction_t oldSigactionMemoryAssert; // sigaction before calling `registerMemoryAssertHandler`
/**
* Registers a signal handler for SIGSEGV that turns them into an assertion failure,
* providing a more descriptive error message and stack trace if the program is
* compiled with debug info and D assertions (as opposed to C assertions).
*
* Differences with the `registerMemoryErrorHandler` version are:
* - The handler is registered with SA_ONSTACK, so it can handle stack overflows.
* - It uses `assert(0)` instead of `throw new Error` and doesn't support catching the error.
* - This is a template so that the -check and -checkaction flags of the compiled program are used,
* instead of the ones used for compiling druntime.
*
* Returns: whether the registration was successful
*/
bool registerMemoryAssertHandler()()
{
nothrow @nogc extern(C)
void _d_handleSignalAssert(int signum, siginfo_t* info, void* contextPtr)
{
// Guess the reason for the segfault by seeing if the faulting address
// is close to the stack pointer or the null pointer.
const void* segfaultingPtr = info.si_addr;
auto context = cast(ucontext.ucontext_t*) contextPtr;
version (X86_64)
const stackPtr = cast(void*) context.uc_mcontext.gregs[ucontext.REG_RSP];
else version (X86)
const stackPtr = cast(void*) context.uc_mcontext.gregs[ucontext.REG_ESP];
else version (ARM)
const stackPtr = cast(void*) context.uc_mcontext.arm_sp;
else version (AArch64)
const stackPtr = cast(void*) context.uc_mcontext.sp;
else version (PPC64)
const stackPtr = cast(void*) context.uc_mcontext.regs.gpr[1];
else
static assert(false, "Unsupported architecture."); // TODO: other architectures
auto distanceToStack = cast(ptrdiff_t) (stackPtr - segfaultingPtr);
if (distanceToStack < 0)
distanceToStack = -distanceToStack;
if (stackPtr && distanceToStack <= 4096)
assert(false, "segmentation fault: call stack overflow");
else if (cast(size_t) segfaultingPtr < MEMORY_RESERVED_FOR_NULL_DEREFERENCE)
assert(false, "segmentation fault: null pointer read/write operation");
else
assert(false, "segmentation fault: invalid pointer read/write operation");
}
sigaction_t action;
action.sa_sigaction = &_d_handleSignalAssert;
action.sa_flags = SA_SIGINFO | SA_ONSTACK;
// Set up alternate stack, because segfaults can be caused by stack overflow,
// in which case the stack is already exhausted
__gshared ubyte[SIGSTKSZ] altStack;
stack_t ss;
ss.ss_sp = altStack.ptr;
ss.ss_size = altStack.length;
ss.ss_flags = 0;
if (sigaltstack(&ss, null) == -1)
return false;
return !sigaction(SIGSEGV, &action, &oldSigactionMemoryAssert);
}
/**
* Revert the memory error handler back to the one from before calling `registerMemoryAssertHandler()`.
*
* Returns: whether the registration of the old handler was successful
*/
bool deregisterMemoryAssertHandler()
{
return !sigaction(SIGSEGV, &oldSigactionMemoryAssert, null);
}
unittest
{
// Testing actual memory errors is done in the test suite
assert(registerMemoryAssertHandler());
assert(deregisterMemoryAssertHandler());
}
}

7
druntime/src/rt/dmain2.d
View file

@ -460,6 +460,13 @@ private extern (C) int _d_run_main2(char[][] args, size_t totalArgsLength, MainF
useExceptionTrap = false;
}
version (none)
{
// Causes test failures related to Fibers, not enabled by default yet
import etc.linux.memoryerror;
cast(void) registerMemoryAssertHandler();
}
void tryExec(scope void delegate() dg)
{
if (useExceptionTrap)

8
druntime/test/exceptions/Makefile
View file

@ -12,7 +12,8 @@ SED:=sed
GDB:=gdb
ifeq ($(OS),linux)
TESTS+=line_trace line_trace_21656 long_backtrace_trunc rt_trap_exceptions cpp_demangle
TESTS+=line_trace line_trace_21656 long_backtrace_trunc rt_trap_exceptions cpp_demangle \
memoryerror_null_read memoryerror_null_write memoryerror_null_call memoryerror_stackoverflow
line_trace_dflags:=-L--export-dynamic
endif
@ -88,6 +89,11 @@ $(ROOT)/rt_trap_exceptions.done: stderr_exp2="src/rt_trap_exceptions.d:8 main"
$(ROOT)/assert_fail.done: stderr_exp="success."
$(ROOT)/cpp_demangle.done: stderr_exp="thrower(int)"
$(ROOT)/message_with_null.done: stderr_exp=" world"
$(ROOT)/memoryerror_null_read.done: stderr_exp="segmentation fault: null pointer read/write operation"
$(ROOT)/memoryerror_null_write.done: stderr_exp="segmentation fault: null pointer read/write operation"
$(ROOT)/memoryerror_null_call.done: stderr_exp="segmentation fault: null pointer read/write operation"
$(ROOT)/memoryerror_null_call.done: stderr_exp2="uncaught exception reached top of stack"
$(ROOT)/memoryerror_stackoverflow.done: stderr_exp="segmentation fault: call stack overflow"
$(ROOT)/%.done: $(ROOT)/%$(DOTEXE)
@echo Testing $*

9
druntime/test/exceptions/src/memoryerror_null_call.d Normal file
View file

@ -0,0 +1,9 @@
import etc.linux.memoryerror;
void function() foo = null;
void main()
{
registerMemoryAssertHandler;
foo();
}

9
druntime/test/exceptions/src/memoryerror_null_read.d Normal file
View file

@ -0,0 +1,9 @@
import etc.linux.memoryerror;
int* x = null;
void main()
{
registerMemoryAssertHandler;
*x = 3;
}

9
druntime/test/exceptions/src/memoryerror_null_write.d Normal file
View file

@ -0,0 +1,9 @@
import etc.linux.memoryerror;
int* x = null;
int main()
{
registerMemoryAssertHandler;
return *x;
}

22
druntime/test/exceptions/src/memoryerror_stackoverflow.d Normal file
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@ -0,0 +1,22 @@
import etc.linux.memoryerror;
pragma(inline, false):
void f(ref ubyte[1024] buf)
{
ubyte[1024] cpy = buf;
g(cpy);
}
void g(ref ubyte[1024] buf)
{
ubyte[1024] cpy = buf;
f(cpy);
}
void main()
{
registerMemoryAssertHandler;
ubyte[1024] buf;
f(buf);
}