Auto merge of #117329 - RalfJung:offset-by-zero, r=oli-obk,scottmcm

offset: allow zero-byte offset on arbitrary pointers

As per prior `@rust-lang/opsem` [discussion](rust-lang/opsem-team#10) and [FCP](rust-lang/unsafe-code-guidelines#472 (comment)):

- Zero-sized reads and writes are allowed on all sufficiently aligned pointers, including the null pointer
- Inbounds-offset-by-zero is allowed on all pointers, including the null pointer
- `offset_from` on two pointers derived from the same allocation is always allowed when they have the same address

This removes surprising UB (in particular, even C++ allows "nullptr + 0", which we currently disallow), and it brings us one step closer to an important theoretical property for our semantics ("provenance monotonicity": if operations are valid on bytes without provenance, then adding provenance can't make them invalid).

The minimum LLVM we require (v17) includes https://reviews.llvm.org/D154051, so we can finally implement this.

The `offset_from` change is needed to maintain the equivalence with `offset`: if `let ptr2 = ptr1.offset(N)` is well-defined, then `ptr2.offset_from(ptr1)` should be well-defined and return N. Now consider the case where N is 0 and `ptr1` dangles: we want to still allow offset_from here.

I think we should change offset_from further, but that's a separate discussion.

Fixes #65108
[Tracking issue](#117945) | [T-lang summary](#117329 (comment))

Cc `@nikic`

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -25,9 +25,9 @@ use rustc_target::spec::abi::Abi as CallAbi;
 use crate::errors::{LongRunning, LongRunningWarn};
 use crate::fluent_generated as fluent;
 use crate::interpret::{
-    self, compile_time_machine, err_ub, throw_exhaust, throw_inval, throw_ub_custom,
+    self, compile_time_machine, err_ub, throw_exhaust, throw_inval, throw_ub_custom, throw_unsup,
     throw_unsup_format, AllocId, AllocRange, ConstAllocation, CtfeProvenance, FnArg, FnVal, Frame,
-    ImmTy, InterpCx, InterpResult, MPlaceTy, OpTy, Pointer, PointerArithmetic, Scalar,
+    GlobalAlloc, ImmTy, InterpCx, InterpResult, MPlaceTy, OpTy, Pointer, PointerArithmetic, Scalar,
 };
 
 use super::error::*;
@@ -759,11 +759,21 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
         ecx: &InterpCx<'mir, 'tcx, Self>,
         alloc_id: AllocId,
     ) -> InterpResult<'tcx> {
+        // Check if this is the currently evaluated static.
         if Some(alloc_id) == ecx.machine.static_root_ids.map(|(id, _)| id) {
-            Err(ConstEvalErrKind::RecursiveStatic.into())
-        } else {
-            Ok(())
+            return Err(ConstEvalErrKind::RecursiveStatic.into());
         }
+        // If this is another static, make sure we fire off the query to detect cycles.
+        // But only do that when checks for static recursion are enabled.
+        if ecx.machine.static_root_ids.is_some() {
+            if let Some(GlobalAlloc::Static(def_id)) = ecx.tcx.try_get_global_alloc(alloc_id) {
+                if ecx.tcx.is_foreign_item(def_id) {
+                    throw_unsup!(ExternStatic(def_id));
+                }
+                ecx.ctfe_query(|tcx| tcx.eval_static_initializer(def_id))?;
+            }
+        }
+        Ok(())
     }
 }
 

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -255,6 +255,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                                     name = intrinsic_name,
                                 );
                             }
+                            // This will always return 0.
                             (a, b)
                         }
                         (Err(_), _) | (_, Err(_)) => {

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -413,6 +413,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     /// to the allocation it points to. Supports both shared and mutable references, as the actual
     /// checking is offloaded to a helper closure.
     ///
+    /// `alloc_size` will only get called for non-zero-sized accesses.
+    ///
     /// Returns `None` if and only if the size is 0.
     fn check_and_deref_ptr<T>(
         &self,
@@ -425,18 +427,19 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             M::ProvenanceExtra,
         ) -> InterpResult<'tcx, (Size, Align, T)>,
     ) -> InterpResult<'tcx, Option<T>> {
+        // Everything is okay with size 0.
+        if size.bytes() == 0 {
+            return Ok(None);
+        }
+
         Ok(match self.ptr_try_get_alloc_id(ptr) {
             Err(addr) => {
-                // We couldn't get a proper allocation. This is only okay if the access size is 0,
-                // and the address is not null.
-                if size.bytes() > 0 || addr == 0 {
-                    throw_ub!(DanglingIntPointer(addr, msg));
-                }
-                None
+                // We couldn't get a proper allocation.
+                throw_ub!(DanglingIntPointer(addr, msg));
             }
             Ok((alloc_id, offset, prov)) => {
                 let (alloc_size, _alloc_align, ret_val) = alloc_size(alloc_id, offset, prov)?;
-                // Test bounds. This also ensures non-null.
+                // Test bounds.
                 // It is sufficient to check this for the end pointer. Also check for overflow!
                 if offset.checked_add(size, &self.tcx).map_or(true, |end| end > alloc_size) {
                     throw_ub!(PointerOutOfBounds {
@@ -447,14 +450,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         msg,
                     })
                 }
-                // Ensure we never consider the null pointer dereferenceable.
-                if M::Provenance::OFFSET_IS_ADDR {
-                    assert_ne!(ptr.addr(), Size::ZERO);
-                }
 
-                // We can still be zero-sized in this branch, in which case we have to
-                // return `None`.
-                if size.bytes() == 0 { None } else { Some(ret_val) }
+                Some(ret_val)
             }
         })
     }
@@ -641,16 +638,18 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             size,
             CheckInAllocMsg::MemoryAccessTest,
             |alloc_id, offset, prov| {
-                if !self.memory.validation_in_progress.get() {
-                    // We want to call the hook on *all* accesses that involve an AllocId,
-                    // including zero-sized accesses. That means we have to do it here
-                    // rather than below in the `Some` branch.
-                    M::before_alloc_read(self, alloc_id)?;
-                }
                 let alloc = self.get_alloc_raw(alloc_id)?;
                 Ok((alloc.size(), alloc.align, (alloc_id, offset, prov, alloc)))
             },
         )?;
+        // We want to call the hook on *all* accesses that involve an AllocId, including zero-sized
+        // accesses. That means we cannot rely on the closure above or the `Some` branch below. We
+        // do this after `check_and_deref_ptr` to ensure some basic sanity has already been checked.
+        if !self.memory.validation_in_progress.get() {
+            if let Ok((alloc_id, ..)) = self.ptr_try_get_alloc_id(ptr) {
+                M::before_alloc_read(self, alloc_id)?;
+            }
+        }
 
         if let Some((alloc_id, offset, prov, alloc)) = ptr_and_alloc {
             let range = alloc_range(offset, size);

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -434,6 +434,11 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
                 found_bytes: has.bytes()
             },
         );
+        // Make sure this is non-null. We checked dereferenceability above, but if `size` is zero
+        // that does not imply non-null.
+        if self.ecx.scalar_may_be_null(Scalar::from_maybe_pointer(place.ptr(), self.ecx))? {
+            throw_validation_failure!(self.path, NullPtr { ptr_kind })
+        }
         // Do not allow pointers to uninhabited types.
         if place.layout.abi.is_uninhabited() {
             let ty = place.layout.ty;
@@ -456,8 +461,8 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
             // `!` is a ZST and we want to validate it.
             if let Ok((alloc_id, _offset, _prov)) = self.ecx.ptr_try_get_alloc_id(place.ptr()) {
                 let mut skip_recursive_check = false;
-                let alloc_actual_mutbl = mutability(self.ecx, alloc_id);
-                if let GlobalAlloc::Static(did) = self.ecx.tcx.global_alloc(alloc_id) {
+                if let Some(GlobalAlloc::Static(did)) = self.ecx.tcx.try_get_global_alloc(alloc_id)
+                {
                     let DefKind::Static { nested, .. } = self.ecx.tcx.def_kind(did) else { bug!() };
                     // Special handling for pointers to statics (irrespective of their type).
                     assert!(!self.ecx.tcx.is_thread_local_static(did));
@@ -495,6 +500,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
                 // If this allocation has size zero, there is no actual mutability here.
                 let (size, _align, _alloc_kind) = self.ecx.get_alloc_info(alloc_id);
                 if size != Size::ZERO {
+                    let alloc_actual_mutbl = mutability(self.ecx, alloc_id);
                     // Mutable pointer to immutable memory is no good.
                     if ptr_expected_mutbl == Mutability::Mut
                         && alloc_actual_mutbl == Mutability::Not
@@ -831,6 +837,8 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
         trace!("visit_value: {:?}, {:?}", *op, op.layout);
 
         // Check primitive types -- the leaves of our recursive descent.
+        // We assume that the Scalar validity range does not restrict these values
+        // any further than `try_visit_primitive` does!
         if self.try_visit_primitive(op)? {
             return Ok(());
         }

library/core/src/intrinsics.rs

@@ -1483,10 +1483,10 @@ extern "rust-intrinsic" {
     ///
     /// # Safety
     ///
-    /// Both the starting and resulting pointer must be either in bounds or one
-    /// byte past the end of an allocated object. If either pointer is out of
-    /// bounds or arithmetic overflow occurs then any further use of the
-    /// returned value will result in undefined behavior.
+    /// If the computed offset is non-zero, then both the starting and resulting pointer must be
+    /// either in bounds or at the end of an allocated object. If either pointer is out
+    /// of bounds or arithmetic overflow occurs then any further use of the returned value will
+    /// result in undefined behavior.
     ///
     /// The stabilized version of this intrinsic is [`pointer::offset`].
     #[must_use = "returns a new pointer rather than modifying its argument"]
@@ -1502,7 +1502,7 @@ extern "rust-intrinsic" {
     /// # Safety
     ///
     /// Unlike the `offset` intrinsic, this intrinsic does not restrict the
-    /// resulting pointer to point into or one byte past the end of an allocated
+    /// resulting pointer to point into or at the end of an allocated
     /// object, and it wraps with two's complement arithmetic. The resulting
     /// value is not necessarily valid to be used to actually access memory.
     ///

library/core/src/ptr/const_ptr.rs

@@ -465,8 +465,9 @@ impl<T: ?Sized> *const T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset, **in bytes**, cannot overflow an `isize`.
     ///
@@ -676,11 +677,11 @@ impl<T: ?Sized> *const T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both `self` and `origin` must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * `self` and `origin` must either
     ///
-    /// * Both pointers must be *derived from* a pointer to the same object.
-    ///   (See below for an example.)
+    ///   * both be *derived from* a pointer to the same [allocated object], and the memory range between
+    ///     the two pointers must be either empty or in bounds of that object. (See below for an example.)
+    ///   * or both be derived from an integer literal/constant, and point to the same address.
     ///
     /// * The distance between the pointers, in bytes, must be an exact multiple
     ///   of the size of `T`.
@@ -951,8 +952,9 @@ impl<T: ?Sized> *const T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset, **in bytes**, cannot overflow an `isize`.
     ///
@@ -1035,8 +1037,9 @@ impl<T: ?Sized> *const T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset cannot exceed `isize::MAX` **bytes**.
     ///

library/core/src/ptr/mod.rs

@@ -15,18 +15,13 @@
 //! The precise rules for validity are not determined yet. The guarantees that are
 //! provided at this point are very minimal:
 //!
-//! * A [null] pointer is *never* valid, not even for accesses of [size zero][zst].
+//! * For operations of [size zero][zst], *every* pointer is valid, including the [null] pointer.
+//!   The following points are only concerned with non-zero-sized accesses.
+//! * A [null] pointer is *never* valid.
 //! * For a pointer to be valid, it is necessary, but not always sufficient, that the pointer
 //!   be *dereferenceable*: the memory range of the given size starting at the pointer must all be
 //!   within the bounds of a single allocated object. Note that in Rust,
 //!   every (stack-allocated) variable is considered a separate allocated object.
-//! * Even for operations of [size zero][zst], the pointer must not be pointing to deallocated
-//!   memory, i.e., deallocation makes pointers invalid even for zero-sized operations. However,
-//!   casting any non-zero integer *literal* to a pointer is valid for zero-sized accesses, even if
-//!   some memory happens to exist at that address and gets deallocated. This corresponds to writing
-//!   your own allocator: allocating zero-sized objects is not very hard. The canonical way to
-//!   obtain a pointer that is valid for zero-sized accesses is [`NonNull::dangling`].
-//FIXME: mention `ptr::dangling` above, once it is stable.
 //! * All accesses performed by functions in this module are *non-atomic* in the sense
 //!   of [atomic operations] used to synchronize between threads. This means it is
 //!   undefined behavior to perform two concurrent accesses to the same location from different

library/core/src/ptr/mut_ptr.rs

@@ -480,8 +480,9 @@ impl<T: ?Sized> *mut T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset, **in bytes**, cannot overflow an `isize`.
     ///
@@ -904,11 +905,11 @@ impl<T: ?Sized> *mut T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both `self` and `origin` must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * `self` and `origin` must either
     ///
-    /// * Both pointers must be *derived from* a pointer to the same object.
-    ///   (See below for an example.)
+    ///   * both be *derived from* a pointer to the same [allocated object], and the memory range between
+    ///     the two pointers must be either empty or in bounds of that object. (See below for an example.)
+    ///   * or both be derived from an integer literal/constant, and point to the same address.
     ///
     /// * The distance between the pointers, in bytes, must be an exact multiple
     ///   of the size of `T`.
@@ -1095,8 +1096,9 @@ impl<T: ?Sized> *mut T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset, **in bytes**, cannot overflow an `isize`.
     ///
@@ -1179,8 +1181,9 @@ impl<T: ?Sized> *mut T {
     /// If any of the following conditions are violated, the result is Undefined
     /// Behavior:
     ///
-    /// * Both the starting and resulting pointer must be either in bounds or one
-    ///   byte past the end of the same [allocated object].
+    /// * If the computed offset, **in bytes**, is non-zero, then both the starting and resulting
+    ///   pointer must be either in bounds or at the end of the same [allocated object].
+    ///   (If it is zero, then the function is always well-defined.)
     ///
     /// * The computed offset cannot exceed `isize::MAX` **bytes**.
     ///