Wide pointer metadata validity: check that the vtable is for the right trait #3497
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I-misses-UB
Impact: makes Miri miss UB, i.e., a false negative (with default settings)
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…=oli-obk Miri: detect wrong vtables in wide pointers Fixes rust-lang/miri#3497. Needed to catch the UB that rust-lang#123572 will start exploiting. r? `@oli-obk`
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…=oli-obk Miri: detect wrong vtables in wide pointers Fixes rust-lang/miri#3497. Needed to catch the UB that rust-lang#123572 will start exploiting. r? ``@oli-obk``
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Rollup merge of rust-lang#124220 - RalfJung:interpret-wrong-vtable, r=oli-obk Miri: detect wrong vtables in wide pointers Fixes rust-lang/miri#3497. Needed to catch the UB that rust-lang#123572 will start exploiting. r? `@oli-obk`
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Miri: detect wrong vtables in wide pointers Fixes #3497. Needed to catch the UB that rust-lang/rust#123572 will start exploiting. r? `@oli-obk`
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With rust-lang/rust#123572, rustc started assuming for UB purposes that a vtable pointer points to a vtabe that's sufficiently big for the given trait. Miri currently isn't able to check that UB.
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