Issues

• What are the opsem effects of CHERI?

  rust-lang/unsafe-code-guidelines#625 · Filter by author RalfJung opened on Sep 24, 2026
  8

• What are the opsem concerns around pointer authentication?

  rust-lang/unsafe-code-guidelines#624 · Filter by author RalfJung opened on Sep 7, 2026
  28

• Declare "trivial ABI" arguments as entirely irrelevant for the ABI?

  rust-lang/unsafe-code-guidelines#623 · Filter by author RalfJung opened on Sep 6, 2026
  2

• No subobject provenance for arrays/slices

  disposition-mergeproposed-final-comment-periodT-opsem
  rust-lang/unsafe-code-guidelines#622 · Filter by author RalfJung opened on Aug 23, 2026
  54

• Can references inside an enum transiently set an invalid enum discriminant?

  disposition-mergefinished-final-comment-periodI-opsem-nominatedS-waiting-on-reviewT-opsemto-announce
  rust-lang/unsafe-code-guidelines#621 · Filter by author nia-e opened on Aug 23, 2026
  10

• Can we allow opportunistic in-place argument passing?

  rust-lang/unsafe-code-guidelines#614 · Filter by author RalfJung opened on Jun 6, 2026
  5

• Does &raw const/mut $path invalidate mutable references

  rust-lang/unsafe-code-guidelines#613 · Filter by author chorman0773 opened on Jun 4, 2026
  4

• Best practices for sharing memory with untrusted parties

  rust-lang/unsafe-code-guidelines#607 · Filter by author RalfJung opened on Mar 28, 2026
  15

• What about: inbounds memory that segfaults on access?

  A-missing
  rust-lang/unsafe-code-guidelines#606 · Filter by author RalfJung opened on Mar 27, 2026
  20

• Does MaybeDangling<&[mut] T> make any requirements about the pointer's provenance?

  rust-lang/unsafe-code-guidelines#605 · Filter by author RalfJung opened on Mar 10, 2026

• How far does repr(transparent)'s transparentness stretch in repr(Rust)?

  A-layoutS-pending-design
  rust-lang/unsafe-code-guidelines#604 · Filter by author Manishearth opened on Mar 7, 2026
  34

• How does Rust's provenance model interact with ARM MTE's hardware provenance?

  rust-lang/unsafe-code-guidelines#603 · Filter by author ais523 opened on Feb 10, 2026
  9

• Can we support stackful coroutines / fibers?

  A-missing
  rust-lang/unsafe-code-guidelines#602 · Filter by author RalfJung opened on Jan 29, 2026
  6

• Should regular assignments really retag?

  A-aliasing-model
  rust-lang/unsafe-code-guidelines#601 · Filter by author RalfJung opened on Jan 28, 2026
  3

• Is it possible to *ever* preserve padding bytes?

  rust-lang/unsafe-code-guidelines#599 · Filter by author clarfonthey opened on Jan 18, 2026
  2

• Is life-before-main / #[ctor] safe?

  rust-lang/unsafe-code-guidelines#598 · Filter by author madsmtm opened on Jan 13, 2026
  36

• We have a semantically relevant inlining pass?

  rust-lang/unsafe-code-guidelines#597 · Filter by author RalfJung opened on Jan 5, 2026
  1

• Is assignment to an uninit but non-Drop place okay?

  rust-lang/unsafe-code-guidelines#596 · Filter by author ChayimFriedman2 opened on Dec 30, 2025
  9

• Can we guarantee that repr(rust) union fields live at offset 0?

  A-layoutS-pending-designT-lang
  rust-lang/unsafe-code-guidelines#595 · Filter by author joshlf opened on Dec 29, 2025
  3

• Are all referents contiguous?

  rust-lang/unsafe-code-guidelines#594 · Filter by author joshlf opened on Dec 23, 2025
  3

• Surprising behavior of aliasing model: references that are transmuted into existence might not have the expected properties

  A-aliasing-model
  rust-lang/unsafe-code-guidelines#593 · Filter by author RalfJung opened on Dec 11, 2025
  27

• Are raw pointers fully equivalent to the place they are created from?

  A-aliasing-modelA-SB-vs-TB
  rust-lang/unsafe-code-guidelines#591 · Filter by author RalfJung opened on Nov 24, 2025

• "Dropping" mutable references to make their memory usable from outside again

  rust-lang/unsafe-code-guidelines#590 · Filter by author ais523 opened on Nov 21, 2025
  8

• Semantics of function pointers with equal addresses?

  rust-lang/unsafe-code-guidelines#589 · Filter by author theemathas opened on Nov 11, 2025
  14

• Validity of Non-matched Patterns

  rust-lang/unsafe-code-guidelines#587 · Filter by author chorman0773 opened on Oct 28, 2025
  2