vararg.cpp
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// RUN: %clangxx_msan -fsanitize-memory-track-origins=0 -O3 %s -o %t && \
// RUN: not %run %t va_arg_tls >%t.out 2>&1
// RUN: FileCheck %s --check-prefix=CHECK < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins=0 -O3 %s -o %t && \
// RUN: not %run %t overflow >%t.out 2>&1
// RUN: FileCheck %s --check-prefix=CHECK < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
// RUN: not %run %t va_arg_tls >%t.out 2>&1
// RUN: FileCheck %s --check-prefixes=CHECK,CHECK-ORIGIN < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
// RUN: not %run %t overflow >%t.out 2>&1
// RUN: FileCheck %s --check-prefixes=CHECK,CHECK-ORIGIN < %t.out
// Check that shadow and origin are passed through va_args.
// Copying origins on AArch64, MIPS and PowerPC isn't supported yet.
// XFAIL: aarch64
// XFAIL: mips
// XFAIL: powerpc64
#include <stdarg.h>
#include <string.h>
__attribute__((noinline))
int sum(int n, ...) {
va_list args;
int i, sum = 0, arg;
volatile int temp;
va_start(args, n);
for (i = 0; i < n; i++) {
arg = va_arg(args, int);
sum += arg;
}
va_end(args);
return sum;
}
int main(int argc, char *argv[]) {
volatile int uninit;
volatile int a = 1, b = 2;
if (argc == 2) {
// Shadow/origin will be passed via va_arg_tls/va_arg_origin_tls.
if (strcmp(argv[1], "va_arg_tls") == 0) {
return sum(3, uninit, a, b);
}
// Shadow/origin of |uninit| will be passed via overflow area.
if (strcmp(argv[1], "overflow") == 0) {
return sum(7,
a, a, a, a, a, a, uninit
);
}
}
return 0;
}
// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
// CHECK-ORIGIN: Uninitialized value was created by an allocation of 'uninit' in the stack frame of function 'main'