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validating the vtable can lead to Stacked Borrows errors

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This commit is contained in:
Ralf Jung 2022-06-05 11:14:30 -04:00
parent 4322a785cc
commit 67ec96955f
1 changed files with 8 additions and 0 deletions
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8
compiler/rustc_const_eval/src/interpret/validity.rs
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@ -338,6 +338,10 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
{ "invalid drop function pointer in vtable (not pointing to a function)" },
err_ub!(InvalidVtableDropFn(..)) =>
{ "invalid drop function pointer in vtable (function has incompatible signature)" },
// Stacked Borrows errors can happen here, see https://github.com/rust-lang/miri/issues/2123.
// (We assume there are no other MachineStop errors possible here.)
InterpError::MachineStop(_) =>
{ "vtable pointer does not have permission to read drop function pointer" },
);
try_validation!(
self.ecx.read_size_and_align_from_vtable(vtable),
@ -347,6 +351,10 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
err_ub!(InvalidVtableAlignment(msg)) =>
{ "invalid vtable: alignment {}", msg },
err_unsup!(ReadPointerAsBytes) => { "invalid size or align in vtable" },
// Stacked Borrows errors can happen here, see https://github.com/rust-lang/miri/issues/2123.
// (We assume there are no other MachineStop errors possible here.)
InterpError::MachineStop(_) =>
{ "vtable pointer does not have permission to read size and alignment" },
);
// FIXME: More checks for the vtable.
}