blob: 2d34dac1b3ff388d8e49ef81e4bd45d815e23791 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
warning: sharing memory with a native function called via FFI
--> tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
|
LL | unsafe { do_one_deref(exposed) };
| ^^^^^^^^^^^^^^^^^^^^^ sharing memory with a native function
|
= help: when memory is shared with a native function call, Miri can only track initialisation and provenance on a best-effort basis
= help: in particular, Miri assumes that the native call initializes all memory it has written to
= help: Miri also assumes that any part of this memory may be a pointer that is permitted to point to arbitrary exposed memory
= help: what this means is that Miri will easily miss Undefined Behavior related to incorrect usage of this shared memory, so you should not take a clean Miri run as a signal that your FFI code is UB-free
= help: tracing memory accesses in native code is not yet fully implemented, so there can be further imprecisions beyond what is documented here
= note: BACKTRACE:
= note: inside `unexposed_reachable_alloc` at tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
note: inside `main`
--> tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
|
LL | unexposed_reachable_alloc();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: Undefined Behavior: memory access failed: attempting to access 4 bytes, but got $HEX[noalloc] which is a dangling pointer (it has no provenance)
--> tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
|
LL | let _not_ok = *invalid;
| ^^^^^^^^ Undefined Behavior occurred here
|
= help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
= help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
= note: BACKTRACE:
= note: inside `unexposed_reachable_alloc` at tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
note: inside `main`
--> tests/native-lib/fail/tracing/unexposed_reachable_alloc.rs:LL:CC
|
LL | unexposed_reachable_alloc();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error; 1 warning emitted
|
