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trivial testcase to notice uninitialized memory use in Rust · GitHub
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trivial testcase to notice uninitialized memory use in Rust
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use std::vec; | |
// Use the system allocator so we can substitute it with a custom one via LD_PRELOAD | |
use std::alloc::System; | |
#[global_allocator] | |
static GLOBAL: System = System; | |
/// Returns the sum of all values in a vector of uninitialized memory | |
fn sum_uninitialized() -> u64 { | |
let mut my_vec: Vec<u64> = Vec::with_capacity(2048); | |
unsafe {my_vec.set_len(2048);} | |
let mut sum = 0; | |
for element in my_vec { | |
sum += element; | |
} | |
sum | |
} | |
// The program will panic if the use of uninitialized memory is noticed. | |
fn main() { | |
let first_run_result = sum_uninitialized(); | |
let second_run_result = sum_uninitialized(); | |
println!("Sum is {}", first_run_result); | |
assert!(first_run_result == second_run_result); | |
} |
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