Add API to temporalily suppress usage of ASAN's fake stack #160135

happyCoder92 · 2025-09-22T15:47:38Z

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

llvmbot · 2025-09-22T15:48:16Z

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: None (happyCoder92)

Changes

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

Full diff: https://github.com/llvm/llvm-project/pull/160135.diff

10 Files Affected:

(modified) compiler-rt/include/sanitizer/asan_interface.h (+7)
(modified) compiler-rt/lib/asan/asan_fake_stack.cpp (+30-7)
(modified) compiler-rt/lib/asan/asan_fake_stack.h (+3-1)
(modified) compiler-rt/lib/asan/asan_interface.inc (+2)
(modified) compiler-rt/lib/asan/asan_thread.cpp (+4-3)
(modified) compiler-rt/lib/asan/asan_thread.h (+7-1)
(modified) compiler-rt/lib/asan_abi/asan_abi.cpp (+2)
(modified) compiler-rt/lib/asan_abi/asan_abi.h (+3)
(modified) compiler-rt/lib/asan_abi/asan_abi_shim.cpp (+6)
(added) compiler-rt/test/asan/TestCases/disable_fake_stack.cpp (+27)

diff --git a/compiler-rt/include/sanitizer/asan_interface.h b/compiler-rt/include/sanitizer/asan_interface.h index 37b6d08f4db19..06deb9116709f 100644 --- a/compiler-rt/include/sanitizer/asan_interface.h +++ b/compiler-rt/include/sanitizer/asan_interface.h @@ -333,6 +333,13 @@ void SANITIZER_CDECL __asan_handle_no_return(void); /// trace. Returns 1 if successful, 0 if not. int SANITIZER_CDECL __asan_update_allocation_context(void *addr); +/// Disables fake stack usage for the current thread. +/// Temporarily disables use-after-return detection for current thread. +void SANITIZER_CDECL __asan_disable_fake_stack_usage(void); + +/// (Re)enables fake stack usage for the current thread. +void SANITIZER_CDECL __asan_enable_fake_stack_usage(void); + #ifdef __cplusplus } // extern "C" #endif diff --git a/compiler-rt/lib/asan/asan_fake_stack.cpp b/compiler-rt/lib/asan/asan_fake_stack.cpp index c3ed2526f0ed4..e1772997d681f 100644 --- a/compiler-rt/lib/asan/asan_fake_stack.cpp +++ b/compiler-rt/lib/asan/asan_fake_stack.cpp @@ -217,26 +217,44 @@ static THREADLOCAL FakeStack *fake_stack_tls; FakeStack *GetTLSFakeStack() { return fake_stack_tls; } -void SetTLSFakeStack(FakeStack *fs) { +void SetTLSFakeStack(AsanThread* t, FakeStack *fs) { + if (fs && !t->fake_stack_usage_enabled()) { + return; + } fake_stack_tls = fs; } #else FakeStack *GetTLSFakeStack() { return 0; } -void SetTLSFakeStack(FakeStack *fs) { } +void SetTLSFakeStack(AsanThread* t, FakeStack *fs) { } #endif // (SANITIZER_LINUX && !SANITIZER_ANDROID) || SANITIZER_FUCHSIA -static FakeStack *GetFakeStack() { +static void DisableFakeStackUsage() { AsanThread *t = GetCurrentThread(); - if (!t) return nullptr; + if (t) { + t->set_fake_stack_usage_enabled(false); + } + SetTLSFakeStack(t, nullptr); +} + +static void EnableFakeStackUsage() { + AsanThread *t = GetCurrentThread(); + if (t) { + t->set_fake_stack_usage_enabled(true); + } +} + +static FakeStack *GetFakeStack(bool for_allocation = true) { + AsanThread *t = GetCurrentThread(); + if (!t || (for_allocation && !t->fake_stack_usage_enabled())) return nullptr; return t->get_or_create_fake_stack(); } -static FakeStack *GetFakeStackFast() { +static FakeStack *GetFakeStackFast(bool for_allocation = true) { if (FakeStack *fs = GetTLSFakeStack()) return fs; if (!__asan_option_detect_stack_use_after_return) return nullptr; - return GetFakeStack(); + return GetFakeStack(for_allocation); } static FakeStack *GetFakeStackFastAlways() { @@ -311,7 +329,7 @@ extern "C" { // -asan-use-after-return=never, after modal UAR flag lands // (https://github.com/google/sanitizers/issues/1394) SANITIZER_INTERFACE_ATTRIBUTE -void *__asan_get_current_fake_stack() { return GetFakeStackFast(); } +void *__asan_get_current_fake_stack() { return GetFakeStackFast(/*for_allocation=*/false); } SANITIZER_INTERFACE_ATTRIBUTE void *__asan_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg, @@ -349,4 +367,9 @@ void __asan_allocas_unpoison(uptr top, uptr bottom) { (reinterpret_cast<void *>(MemToShadow(top)), 0, (bottom - top) / ASAN_SHADOW_GRANULARITY); } + +SANITIZER_INTERFACE_ATTRIBUTE +void __asan_disable_fake_stack_usage() { return DisableFakeStackUsage(); } +SANITIZER_INTERFACE_ATTRIBUTE +void __asan_enable_fake_stack_usage() { return EnableFakeStackUsage(); } } // extern "C" diff --git a/compiler-rt/lib/asan/asan_fake_stack.h b/compiler-rt/lib/asan/asan_fake_stack.h index 50706e6e5876c..9f1f452834b97 100644 --- a/compiler-rt/lib/asan/asan_fake_stack.h +++ b/compiler-rt/lib/asan/asan_fake_stack.h @@ -18,6 +18,8 @@ namespace __asan { +class AsanThread; + // Fake stack frame contains local variables of one function. struct FakeFrame { uptr magic; // Modified by the instrumented code. @@ -196,7 +198,7 @@ class FakeStack { }; FakeStack *GetTLSFakeStack(); -void SetTLSFakeStack(FakeStack *fs); +void SetTLSFakeStack(AsanThread* t, FakeStack *fs); } // namespace __asan diff --git a/compiler-rt/lib/asan/asan_interface.inc b/compiler-rt/lib/asan/asan_interface.inc index bfc44b4619623..a279ae834549a 100644 --- a/compiler-rt/lib/asan/asan_interface.inc +++ b/compiler-rt/lib/asan/asan_interface.inc @@ -15,6 +15,8 @@ INTERFACE_FUNCTION(__asan_alloca_poison) INTERFACE_FUNCTION(__asan_allocas_unpoison) INTERFACE_FUNCTION(__asan_before_dynamic_init) INTERFACE_FUNCTION(__asan_describe_address) +INTERFACE_FUNCTION(__asan_disable_fake_stack_usage) +INTERFACE_FUNCTION(__asan_enable_fake_stack_usage) INTERFACE_FUNCTION(__asan_exp_load1) INTERFACE_FUNCTION(__asan_exp_load2) INTERFACE_FUNCTION(__asan_exp_load4) diff --git a/compiler-rt/lib/asan/asan_thread.cpp b/compiler-rt/lib/asan/asan_thread.cpp index 2627ae1289012..f6f54022bf377 100644 --- a/compiler-rt/lib/asan/asan_thread.cpp +++ b/compiler-rt/lib/asan/asan_thread.cpp @@ -163,7 +163,7 @@ void AsanThread::StartSwitchFiber(FakeStack **fake_stack_save, uptr bottom, if (fake_stack_save) *fake_stack_save = fake_stack_; fake_stack_ = nullptr; - SetTLSFakeStack(nullptr); + SetTLSFakeStack(this, nullptr); // if fake_stack_save is null, the fiber will die, delete the fakestack if (!fake_stack_save && current_fake_stack) current_fake_stack->Destroy(this->tid()); @@ -177,7 +177,7 @@ void AsanThread::FinishSwitchFiber(FakeStack *fake_stack_save, uptr *bottom_old, } if (fake_stack_save) { - SetTLSFakeStack(fake_stack_save); + SetTLSFakeStack(this, fake_stack_save); fake_stack_ = fake_stack_save; } @@ -242,7 +242,7 @@ FakeStack *AsanThread::AsyncSignalSafeLazyInitFakeStack() { Max(stack_size_log, static_cast<uptr>(flags()->min_uar_stack_size_log)); fake_stack_ = FakeStack::Create(stack_size_log); DCHECK_EQ(GetCurrentThread(), this); - SetTLSFakeStack(fake_stack_); + SetTLSFakeStack(this, fake_stack_); return fake_stack_; } return nullptr; @@ -251,6 +251,7 @@ FakeStack *AsanThread::AsyncSignalSafeLazyInitFakeStack() { void AsanThread::Init(const InitOptions *options) { DCHECK_NE(tid(), kInvalidTid); next_stack_top_ = next_stack_bottom_ = 0; + fake_stack_usage_enabled_ = true; atomic_store(&stack_switching_, false, memory_order_release); CHECK_EQ(this->stack_size(), 0U); SetThreadStackAndTls(options); diff --git a/compiler-rt/lib/asan/asan_thread.h b/compiler-rt/lib/asan/asan_thread.h index 12f0cc7a62dae..c54bbb1c64604 100644 --- a/compiler-rt/lib/asan/asan_thread.h +++ b/compiler-rt/lib/asan/asan_thread.h @@ -104,7 +104,7 @@ class AsanThread { if (!fake_stack_) return; FakeStack *t = fake_stack_; fake_stack_ = nullptr; - SetTLSFakeStack(nullptr); + SetTLSFakeStack(this, nullptr); t->Destroy(tid); } @@ -144,6 +144,11 @@ class AsanThread { GetStartData(&data, sizeof(data)); } + bool fake_stack_usage_enabled() const { return fake_stack_usage_enabled_; } + void set_fake_stack_usage_enabled(bool enabled) { + fake_stack_usage_enabled_ = enabled; + } + private: // NOTE: There is no AsanThread constructor. It is allocated // via mmap() and *must* be valid in zero-initialized state. @@ -179,6 +184,7 @@ class AsanThread { DTLS *dtls_; FakeStack *fake_stack_; + bool fake_stack_usage_enabled_; AsanThreadLocalMallocStorage malloc_storage_; AsanStats stats_; bool unwinding_; diff --git a/compiler-rt/lib/asan_abi/asan_abi.cpp b/compiler-rt/lib/asan_abi/asan_abi.cpp index cf8663024eb73..c2bf2f52dd4e5 100644 --- a/compiler-rt/lib/asan_abi/asan_abi.cpp +++ b/compiler-rt/lib/asan_abi/asan_abi.cpp @@ -73,6 +73,8 @@ void *__asan_abi_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg, void **end) { return NULL; } +void __asan_abi_disable_fake_stack_usage(void) {} +void __asan_abi_enable_fake_stack_usage(void) {} // Functions concerning poisoning and unpoisoning fake stack alloca void __asan_abi_alloca_poison(void *addr, size_t size) {} diff --git a/compiler-rt/lib/asan_abi/asan_abi.h b/compiler-rt/lib/asan_abi/asan_abi.h index 8702bcd133919..372e44e755cc5 100644 --- a/compiler-rt/lib/asan_abi/asan_abi.h +++ b/compiler-rt/lib/asan_abi/asan_abi.h @@ -76,6 +76,9 @@ void *__asan_abi_load_cxx_array_cookie(void **p); void *__asan_abi_get_current_fake_stack(); void *__asan_abi_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg, void **end); +void *__asan_abi_disable_fake_stack_usage(); +void *__asan_abi_enable_fake_stack_usage(); + // Functions concerning poisoning and unpoisoning fake stack alloca void __asan_abi_alloca_poison(void *addr, size_t size); void __asan_abi_allocas_unpoison(void *top, void *bottom); diff --git a/compiler-rt/lib/asan_abi/asan_abi_shim.cpp b/compiler-rt/lib/asan_abi/asan_abi_shim.cpp index 2512abc641250..0b4a170015b61 100644 --- a/compiler-rt/lib/asan_abi/asan_abi_shim.cpp +++ b/compiler-rt/lib/asan_abi/asan_abi_shim.cpp @@ -365,6 +365,12 @@ void *__asan_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg, void **end) { return __asan_abi_addr_is_in_fake_stack(fake_stack, addr, beg, end); } +void __asan_disable_fake_stack_usage(void) { + return __asan_abi_disable_fake_stack_usage(); +} +void __asan_enable_fake_stack_usage(void) { + return __asan_abi_enable_fake_stack_usage(); +} // Functions concerning poisoning and unpoisoning fake stack alloca void __asan_alloca_poison(uptr addr, uptr size) { diff --git a/compiler-rt/test/asan/TestCases/disable_fake_stack.cpp b/compiler-rt/test/asan/TestCases/disable_fake_stack.cpp new file mode 100644 index 0000000000000..b1ee8d72e2b58 --- /dev/null +++ b/compiler-rt/test/asan/TestCases/disable_fake_stack.cpp @@ -0,0 +1,27 @@ +// RUN: %clangxx_asan %s -o %t && %run %t + +#include "defines.h" + +#include <sanitizer/asan_interface.h> + +volatile char *saved; + +ATTRIBUTE_NOINLINE bool IsOnStack() { + volatile char temp = ' '; + void* fake_stack = __asan_get_current_fake_stack(); + void* real = __asan_addr_is_in_fake_stack(fake_stack, const_cast<char*>(&temp), nullptr, nullptr); + saved = &temp; + return real == nullptr; +} + +int main(int argc, char *argv[]) { + __asan_disable_fake_stack_usage(); + if (!IsOnStack()) { + return 1; + } + __asan_enable_fake_stack_usage(); + if (IsOnStack()) { + return 2; + } + return 0; +}

github-actions · 2025-09-22T15:51:18Z

✅ With the latest revision this PR passed the C/C++ code formatter.

compiler-rt/include/sanitizer/asan_interface.h

compiler-rt/lib/asan/asan_thread.h

vitalybuka · 2025-09-22T16:55:06Z

I thought StartSwitchFiber was added for that

I am not sure I understand what is special with MADV_DONTDUMP
Can you add a test which essentially reproduces the issue?
You don't need to remove the existing test.

vitalybuka

comments above

happyCoder92 · 2025-09-23T12:49:31Z

Addressed the comments.
We switch to a MADV_DONTDUMP stack and don't want any of the local variable contents to end up in a core dump.
As fake stack is not allocated with the same flags, its usage will result in those variables ending up in the core dump.

compiler-rt/lib/asan/asan_fake_stack.cpp

vitalybuka · 2025-10-14T23:56:15Z

compiler-rt/lib/asan/asan_fake_stack.cpp

@@ -311,7 +329,9 @@ extern "C" {
 // -asan-use-after-return=never, after modal UAR flag lands
 // (https://github.com/google/sanitizers/issues/1394)
 SANITIZER_INTERFACE_ATTRIBUTE
-void *__asan_get_current_fake_stack() { return GetFakeStackFast(); }
+void* __asan_get_current_fake_stack() {


There is TODO for to remove this one
if this is just for test, can we instead rely on __asan_get_current_fake_stack
Use __builtin_frame_address

__builtin_frame_address always return real stack address

Removed the argument and adjusted the test.

Did you forget to upload the patch?

I have rebased and updated it

vitalybuka · 2025-10-15T00:38:10Z

compiler-rt/lib/asan/asan_fake_stack.cpp

@@ -217,26 +217,44 @@ static THREADLOCAL FakeStack *fake_stack_tls;
 FakeStack *GetTLSFakeStack() {
 return fake_stack_tls;
 }
-void SetTLSFakeStack(FakeStack *fs) {
+void SetTLSFakeStack(AsanThread* t, FakeStack* fs) {


Will #163481 help to simplify this patch?

Slightly. By only calling SetTLSFakeStack from GetFakeStack #163481 also indirectly ensures the tls var won't be set if fake stack is disabled. I added the thread arg and put the logic into SetTLSFakeStack to make it more explicit.

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

…ake_stack_tls (#163481) To simplify implementation of #160135

…163674) To simplify implementation of #160135 To keep the logic of figuring out what should be in TLS to one place. The rest of the code should just reset it and rely on GetFakeStackFast()/GetFakeStackFastAlways().

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

This reverts commit 4e72801.

vitalybuka · 2025-10-16T02:36:46Z

@happyCoder92 can you please elaborate description message?

…SFakeStack (#163674) To simplify implementation of llvm/llvm-project#160135 To keep the logic of figuring out what should be in TLS to one place. The rest of the code should just reset it and rely on GetFakeStackFast()/GetFakeStackFastAlways().

thurstond

What is the intended interaction of this API with -mllvm -asan-use-after-return={never,runtime,always} and ASAN_OPTIONS=detect_stack_use_after_return={0,1}? Please update the description and TestCases/disable_fake_stack.cpp to clarify.

Also, if the behavior of __asan_disable_fake_stack()/__asan_enable_fake_stack() depends on those flags, the naming could be confusing.

happyCoder92 · 2025-10-17T13:31:58Z

The behavior does depend on the flags. Would __asan_suppress_fake_stack and __asan_unsuppress_fake_stack be less confusing?

vitalybuka · 2025-10-17T17:20:16Z

The behavior does depend on the flags. Would __asan_suppress_fake_stack and __asan_unsuppress_fake_stack be less confusing?

I don't have a preference for naming.

I assume @thurstond is asking not to disable the fake stack in always mode.

But in this case __asan_disable_fake_stack caller needs to know that the call failed?

I the current __asan_get_current_fake_stack can be used for that.

Also we need actually not a bool but counters, see __lsan_disable().

This will fix the issue when code on multiple layers will try to suppress the fake stack.

thurstond · 2025-10-17T17:41:22Z

The behavior does depend on the flags. Would __asan_suppress_fake_stack and __asan_unsuppress_fake_stack be less confusing?

I don't have a preference for naming.

I assume @thurstond is asking not to disable the fake stack in always mode.

But in this case __asan_disable_fake_stack caller needs to know that the call failed?

I the current __asan_get_current_fake_stack can be used for that.

Also we need actually not a bool but counters, see __lsan_disable().

This will fix the issue when code on multiple layers will try to suppress the fake stack.

Based on testing, I believe the behavior is:

compiled with "never", any ASAN_OPTIONS: fake stack is always off
compiled with "runtime", ASAN_OPTIONS=detect_stack_use_after_return=0: fake stack is always off
compiled with "runtime", ASAN_OPTIONS=detect_stack_use_after_return=1: fake stack on initially, __asan_disable_fake_stack()/__asan_enable_fake_stack() work as expected
compiled with "always", any ASAN_OPTIONS: fake stack is always on

The behavior of 1, 3 and 4 are as good as can be expected (but needs to be documented/tested).

For 2., since __asan_disable_fake_stack()/__asan_enable_fake_stack() is a runtime API, it is debatable why it can't override ASAN_OPTIONS=detect_stack_use_after_return (i.e., should detect_stack_use_after_return= set the initial state of whether the fake stack is on/off, rather than permanently turning it off in the case of =0?).

In terms of naming, variables such as fake_stack_enabled_ and related functions such as IsFakeStackEnabled() aren't quite accurate descriptions, because e.g., in "never" mode, the fake stack is always off but after calling __asan_enable_fake_stack(), fake_stack_enabled_ == true, IsFakeStackEnabled() == true.

vitalybuka · 2025-10-17T17:47:39Z

For 2., since __asan_disable_fake_stack()/__asan_enable_fake_stack() is a runtime API, it is debatable why it can't

The point of '=2' is to change Asan pass to generate code which does not check for nullptr.

Regarding documentation, In this header yes, in Clang docs, better not yet.

compiler-rt/lib/asan/asan_thread.h

thurstond · 2025-10-17T17:54:04Z

For 2., since __asan_disable_fake_stack()/__asan_enable_fake_stack() is a runtime API, it is debatable why it can't

The point of '=2' is to change Asan pass to generate code which does not check for nullptr.

Regarding documentation, In this header yes, in Clang docs, better not yet.

By "For 2.", I was referring to bullet point 2 (sorry for the ambiguity):

compiled with "runtime", ASAN_OPTIONS=detect_stack_use_after_return=0: fake stack is always off

Why can't this be overridden by __asan_disable_fake_stack()/__asan_enable_fake_stack()?

happyCoder92 · 2025-10-22T15:37:11Z

The intention was to be always able to disable fake stack with this API (regardless of compile & runtime options), but not to enable it if it was disabled via other means. I think it should work like that as currently implemented, but more thorough testing is needed.

happyCoder92 · 2025-11-25T15:33:02Z

I added tests to clarify the behavior.
Changed the naming and also used a counter.

As stated before the intention is to always suppress/disable fake stack __asan_suppress_fake_stack(), but not reenable it with __asan_unsuppress_fake_stack() if disabled via some other option.

thurstond · 2025-11-25T18:43:08Z

I added tests to clarify the behavior. Changed the naming and also used a counter.

As stated before the intention is to always suppress/disable fake stack __asan_suppress_fake_stack(), but not reenable it with __asan_unsuppress_fake_stack() if disabled via some other option.

Thanks, LGTM!

compiler-rt/test/asan/TestCases/suppress_fake_stack.cpp

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[asan] Make GetFakeStackFast()/GetFakeStackFastAlways() lazily init fake_stack_tls #163481

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Add API to temporalily disable usage of ASAN's fake stack

4e72801

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

happyCoder92 force-pushed the main branch from 10972a7 to 4e72801 Compare October 15, 2025 13:11

vitalybuka mentioned this pull request Oct 16, 2025

[asan] Hide SetTLSFakeStack and replaces uses with ResetTLSFakeStack #163674

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[asan] Make GetFakeStackFast()/GetFakeStackFastAlways() lazily init f…

082efba

…ake_stack_tls (#163481) To simplify implementation of #160135

happyCoder92 and others added 6 commits October 15, 2025 18:58

Add API to temporalily disable usage of ASAN's fake stack

c10e568

Intended use-case is for threads that use (or switch to) stack with special properties e.g. backed by MADV_DONTDUMP memory.

Revert "Add API to temporalily disable usage of ASAN's fake stack"

0769e3d

This reverts commit 4e72801.

Merge branch 'happyCoder92/main' into HEAD

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Update test

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format

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format

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happyCoder92 added 2 commits November 25, 2025 15:45

Add thorough tests

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Rename the functions & use counter

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happyCoder92 added 2 commits November 25, 2025 16:33

Code formatting

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Merge branch 'main' into main

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happyCoder92 changed the title ~~Add API to temporalily disable usage of ASAN's fake stack~~ Add API to temporalily suppress usage of ASAN's fake stack Nov 25, 2025

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Rename test utility & try to fix it for Windows

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Explicitly set UAR option as those default to false on Windows

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