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Rollup merge of rust-lang#130342 - RalfJung:slice-idx-overflow, r=saethlin interpret, miri: fix dealing with overflow during slice indexing and allocation This is mostly to fix rust-lang#130284. I then realized we're using somewhat sketchy arguments for a similar multiplication in `copy`/`copy_nonoverlapping`/`write_bytes`, so I made them all share the same function that checks exactly the right thing. (The intrinsics would previously fail on allocations larger than `1 << 47` bytes... which are theoretically possible maybe? Anyway it seems conceptually wrong to use any other bound than `isize::MAX` here.)
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Original file line number | Diff line number | Diff line change |
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const C: () = { | ||
let value = [1, 2]; | ||
let ptr = value.as_ptr().wrapping_add(2); | ||
let fat = std::ptr::slice_from_raw_parts(ptr, usize::MAX); | ||
unsafe { | ||
// This used to ICE, but it should just report UB. | ||
let _ice = (*fat)[usize::MAX - 1]; | ||
//~^ERROR: constant value failed | ||
//~| overflow | ||
} | ||
}; | ||
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fn main() {} |
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error[E0080]: evaluation of constant value failed | ||
--> $DIR/slice-index-overflow-issue-130284.rs:7:20 | ||
| | ||
LL | let _ice = (*fat)[usize::MAX - 1]; | ||
| ^^^^^^^^^^^^^^^^^^^^^^ overflowing pointer arithmetic: the total offset in bytes does not fit in an `isize` | ||
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error: aborting due to 1 previous error | ||
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For more information about this error, try `rustc --explain E0080`. |