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[asan] Intercept __makecontext_v2 on Solaris/SPARC #81588

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Merged
merged 1 commit into from
Feb 16, 2024
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[asan] Intercept __makecontext_v2 on Solaris/SPARC #81588

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17 changes: 17 additions & 0 deletions compiler-rt/lib/asan/asan_interceptors.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -352,8 +352,16 @@ static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) {
PoisonShadow(bottom, ssize, 0);
}

// Since Solaris 10/SPARC, ucp->uc_stack.ss_sp refers to the stack base address
// as on other targets. For binary compatibility, the new version uses a
// different external name, so we intercept that.
# if SANITIZER_SOLARIS && defined(__sparc__)
INTERCEPTOR(void, __makecontext_v2, struct ucontext_t *ucp, void (*func)(),
int argc, ...) {
# else
INTERCEPTOR(void, makecontext, struct ucontext_t *ucp, void (*func)(), int argc,
...) {
# endif
va_list ap;
uptr args[64];
// We don't know a better way to forward ... into REAL function. We can
Expand All @@ -373,7 +381,11 @@ INTERCEPTOR(void, makecontext, struct ucontext_t *ucp, void (*func)(), int argc,
ENUMERATE_ARRAY_16(0), ENUMERATE_ARRAY_16(16), ENUMERATE_ARRAY_16(32), \
ENUMERATE_ARRAY_16(48)

# if SANITIZER_SOLARIS && defined(__sparc__)
REAL(__makecontext_v2)
# else
REAL(makecontext)
# endif
((struct ucontext_t *)ucp, func, argc, ENUMERATE_ARRAY_64());

# undef ENUMERATE_ARRAY_4
Expand Down Expand Up @@ -780,7 +792,12 @@ void InitializeAsanInterceptors() {

# if ASAN_INTERCEPT_SWAPCONTEXT
ASAN_INTERCEPT_FUNC(swapcontext);
// See the makecontext interceptor above for an explanation.
# if SANITIZER_SOLARIS && defined(__sparc__)
ASAN_INTERCEPT_FUNC(__makecontext_v2);
# else
ASAN_INTERCEPT_FUNC(makecontext);
# endif
# endif
# if ASAN_INTERCEPT__LONGJMP
ASAN_INTERCEPT_FUNC(_longjmp);
Expand Down