https://bugs.llvm.org/show_bug.cgi?id=37138
Bug ID: 37138
Summary: msan: incorrect origin for 64-bit values
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: compiler-rt
Assignee: unassignedb...@nondot.org
Reporter: dvyu...@google.com
CC: llvm-bugs@lists.llvm.org
clang version 7.0.0 (trunk 326052)
#include <stdlib.h>
__attribute__((noinline)) void inithalf(void* x)
{
*(int*)x = 0;
}
__attribute__((noinline)) void copyhalf(void* x, void* y)
{
*(int*)x = *(int*)y;
}
__attribute__((noinline)) void copy(long long* x, long long* y)
{
*x = *y;
}
int main() {
long long x, y, z;
copyhalf(&y, &z);
inithalf(&y);
copy(&x, &y);
if (x)
exit(1);
}
==258685==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x499df4 in main /tmp/msan.c:23:6
#1 0x7f00b44cb2b0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b0)
#2 0x41d639 in _start
(/usr/local/google/home/dvyukov/src/linux2/a.out+0x41d639)
Uninitialized value was stored to memory at
#0 0x499c98 in copy /tmp/msan.c:15:5
Uninitialized value was stored to memory at
#0 0x499c03 in copyhalf /tmp/msan.c:10:11
Uninitialized value was created by an allocation of 'z' in the stack frame of
function 'main'
#0 0x499cd0 in main /tmp/msan.c:18
SUMMARY: MemorySanitizer: use-of-uninitialized-value /tmp/msan.c:23:6 in main
Uninit value comes from 'y'.
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