645c0fddd2
Previously, it was only put on scalars with range validity invariants like bool, was uninit was obviously invalid for those. Since then, we have normatively declared all uninit primitives to be undefined behavior and can therefore put `noundef` on them. The remaining concern was the `mem::uninitialized` function, which cause quite a lot of UB in the older parts of the ecosystem. This function now doesn't return uninit values anymore, making users of it safe from this change. The only real sources of UB where people could encounter uninit primitives are `MaybeUninit::uninit().assume_init()`, which has always be clear in the docs about being UB and from heap allocations (like reading from the spare capacity of a vec. This is hopefully rare enough to not break anything.
44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
// Verifies that KCFI type metadata for functions are emitted.
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//
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// revisions: aarch64 x86_64
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// [aarch64] compile-flags: --target aarch64-unknown-none
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// [aarch64] needs-llvm-components: aarch64
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// [x86_64] compile-flags: --target x86_64-unknown-none
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// [x86_64] needs-llvm-components:
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// compile-flags: -Cno-prepopulate-passes -Zsanitizer=kcfi
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#![crate_type="lib"]
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#![feature(no_core, lang_items)]
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#![no_core]
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#[lang="sized"]
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trait Sized { }
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#[lang="copy"]
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trait Copy { }
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impl Copy for i32 {}
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pub fn foo(f: fn(i32) -> i32, arg: i32) -> i32 {
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// CHECK-LABEL: define{{.*}}foo
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// CHECK-SAME: {{.*}}!{{<unknown kind #36>|kcfi_type}} ![[TYPE1:[0-9]+]]
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// CHECK: call noundef i32 %f(i32 noundef %arg){{.*}}[ "kcfi"(i32 -1666898348) ]
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f(arg)
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}
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pub fn bar(f: fn(i32, i32) -> i32, arg1: i32, arg2: i32) -> i32 {
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// CHECK-LABEL: define{{.*}}bar
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// CHECK-SAME: {{.*}}!{{<unknown kind #36>|kcfi_type}} ![[TYPE2:[0-9]+]]
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// CHECK: call noundef i32 %f(i32 noundef %arg1, i32 noundef %arg2){{.*}}[ "kcfi"(i32 -1789026986) ]
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f(arg1, arg2)
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}
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pub fn baz(f: fn(i32, i32, i32) -> i32, arg1: i32, arg2: i32, arg3: i32) -> i32 {
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// CHECK-LABEL: define{{.*}}baz
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// CHECK-SAME: {{.*}}!{{<unknown kind #36>|kcfi_type}} ![[TYPE3:[0-9]+]]
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// CHECK: call noundef i32 %f(i32 noundef %arg1, i32 noundef %arg2, i32 noundef %arg3){{.*}}[ "kcfi"(i32 1248878270) ]
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f(arg1, arg2, arg3)
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}
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// CHECK: ![[TYPE1]] = !{i32 653723426}
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// CHECK: ![[TYPE2]] = !{i32 412174924}
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// CHECK: ![[TYPE3]] = !{i32 -636668840}
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