ebd4dc4263
In the test from https://reviews.llvm.org/D7098, `char array[len];` is 32-byte aligned on most targets whether it is instrumented or not (optimized by StackSafetyAnalysis), due to the the used `*FrameLowering` being `StackRealignable`. However, when using `SystemZELFFrameLowering`, an un-instrumented `char array[len];` is only 8-byte aligned. Ensure `char array[len];` gets instrumented like what we did to `alloca_vla_interact.cpp`, to make the test pass on s390x.
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
// RUN: %clangxx_asan -O0 -mllvm -asan-instrument-dynamic-allocas %s -o %t
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// RUN: %env_asan_opts=detect_stack_use_after_return=0 %run %t 2>&1
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//
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// REQUIRES: stable-runtime
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// This testcase checks that allocas and VLAs inside loop are correctly unpoisoned.
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "sanitizer/asan_interface.h"
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// MSVC provides _alloca instead of alloca.
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#if defined(_MSC_VER) && !defined(alloca)
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# define alloca _alloca
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#endif
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#if defined(__sun__) && defined(__svr4__)
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#include <alloca.h>
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#endif
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void *top, *bot;
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__attribute__((noinline)) void foo(int len) {
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char x;
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top = &x;
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volatile char array[len];
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if (len)
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array[0] = 0;
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assert(!(reinterpret_cast<uintptr_t>(array) & 31L));
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alloca(len);
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for (int i = 0; i < 32; ++i) {
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volatile char array[i];
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if (i)
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array[0] = 0;
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bot = alloca(i);
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assert(!(reinterpret_cast<uintptr_t>(bot) & 31L));
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}
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}
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int main(int argc, char **argv) {
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foo(32);
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void *q = __asan_region_is_poisoned(bot, (char *)top - (char *)bot);
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assert(!q);
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return 0;
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}
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