diff --git a/Cargo.lock b/Cargo.lock index cf47e75b0562..fd76b5e75b43 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -169,7 +169,7 @@ dependencies = [ "heck", "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] @@ -482,7 +482,7 @@ dependencies = [ "proc-macro-error", "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] @@ -909,29 +909,29 @@ dependencies = [ [[package]] name = "serde" -version = "1.0.203" +version = "1.0.204" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094" +checksum = "bc76f558e0cbb2a839d37354c575f1dc3fdc6546b5be373ba43d95f231bf7c12" dependencies = [ "serde_derive", ] [[package]] name = "serde_derive" -version = "1.0.203" +version = "1.0.204" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba" +checksum = "e0cd7e117be63d3c3678776753929474f3b04a43a080c744d6b0ae2a8c28e222" dependencies = [ "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] name = "serde_json" -version = "1.0.119" +version = "1.0.120" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "e8eddb61f0697cc3989c5d64b452f5488e2b8a60fd7d5076a3045076ffef8cb0" +checksum = "4e0d21c9a8cae1235ad58a00c11cb40d4b1e5c784f1ef2c537876ed6ffd8b7c5" dependencies = [ "itoa", "ryu", @@ -1030,7 +1030,7 @@ dependencies = [ "proc-macro2", "quote", "rustversion", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] @@ -1045,9 +1045,9 @@ dependencies = [ [[package]] name = "syn" -version = "2.0.68" +version = "2.0.69" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9" +checksum = "201fcda3845c23e8212cd466bfebf0bd20694490fc0356ae8e428e0824a915a6" dependencies = [ "proc-macro2", "quote", @@ -1083,7 +1083,7 @@ checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533" dependencies = [ "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] @@ -1149,7 +1149,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7" dependencies = [ "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] [[package]] @@ -1320,9 +1320,9 @@ dependencies = [ [[package]] name = "windows-targets" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb" +checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973" dependencies = [ "windows_aarch64_gnullvm", "windows_aarch64_msvc", @@ -1336,51 +1336,51 @@ dependencies = [ [[package]] name = "windows_aarch64_gnullvm" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263" +checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3" [[package]] name = "windows_aarch64_msvc" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6" +checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469" [[package]] name = "windows_i686_gnu" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670" +checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b" [[package]] name = "windows_i686_gnullvm" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9" +checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66" [[package]] name = "windows_i686_msvc" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf" +checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66" [[package]] name = "windows_x86_64_gnu" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9" +checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78" [[package]] name = "windows_x86_64_gnullvm" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596" +checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d" [[package]] name = "windows_x86_64_msvc" -version = "0.52.5" +version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0" +checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec" [[package]] name = "winnow" @@ -1399,20 +1399,20 @@ checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904" [[package]] name = "zerocopy" -version = "0.7.34" +version = "0.7.35" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087" +checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0" dependencies = [ "zerocopy-derive", ] [[package]] name = "zerocopy-derive" -version = "0.7.34" +version = "0.7.35" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b" +checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e" dependencies = [ "proc-macro2", "quote", - "syn 2.0.68", + "syn 2.0.69", ] diff --git a/kani-compiler/src/kani_middle/transform/check_uninit/uninit_visitor.rs b/kani-compiler/src/kani_middle/transform/check_uninit/uninit_visitor.rs index 19b13c6ab8b6..0614724be6bf 100644 --- a/kani-compiler/src/kani_middle/transform/check_uninit/uninit_visitor.rs +++ b/kani-compiler/src/kani_middle/transform/check_uninit/uninit_visitor.rs @@ -12,9 +12,11 @@ use stable_mir::mir::{ NonDivergingIntrinsic, Operand, Place, PointerCoercion, ProjectionElem, Rvalue, Statement, StatementKind, Terminator, TerminatorKind, }; -use stable_mir::ty::{ConstantKind, MirConst, RigidTy, Span, TyKind, UintTy}; +use stable_mir::ty::{ConstantKind, MirConst, RigidTy, Span, Ty, TyKind, UintTy}; use strum_macros::AsRefStr; +use super::{PointeeInfo, PointeeLayout}; + /// Memory initialization operations: set or get memory initialization state for a given pointer. #[derive(AsRefStr, Clone, Debug)] pub enum MemoryInitOp { @@ -540,13 +542,34 @@ impl<'a> MirVisitor for CheckUninitVisitor<'a> { } fn visit_rvalue(&mut self, rvalue: &Rvalue, location: Location) { - if let Rvalue::Cast(CastKind::PointerCoercion(PointerCoercion::Unsize), _, ty) = rvalue { - if let TyKind::RigidTy(RigidTy::RawPtr(pointee_ty, _)) = ty.kind() { - if pointee_ty.kind().is_trait() { - self.push_target(MemoryInitOp::Unsupported { - reason: "Kani does not support reasoning about memory initialization of unsized pointers.".to_string(), - }); + if let Rvalue::Cast(cast_kind, operand, ty) = rvalue { + match cast_kind { + CastKind::PointerCoercion(PointerCoercion::Unsize) => { + if let TyKind::RigidTy(RigidTy::RawPtr(pointee_ty, _)) = ty.kind() { + if pointee_ty.kind().is_trait() { + self.push_target(MemoryInitOp::Unsupported { + reason: "Kani does not support reasoning about memory initialization of unsized pointers.".to_string(), + }); + } + } } + CastKind::PtrToPtr => { + let operand_ty = operand.ty(&self.locals).unwrap(); + if let ( + RigidTy::RawPtr(from_ty, Mutability::Mut), + RigidTy::RawPtr(to_ty, Mutability::Mut), + ) = (operand_ty.kind().rigid().unwrap(), ty.kind().rigid().unwrap()) + { + if !tys_layout_compatible(from_ty, to_ty) { + // If casting from a mutable pointer to a mutable pointer with + // different layouts, delayed UB could occur. + self.push_target(MemoryInitOp::Unsupported { + reason: "Kani does not support reasoning about memory initialization in presence of mutable raw pointer casts that could cause delayed UB.".to_string(), + }); + } + } + } + _ => {} } }; self.super_rvalue(rvalue, location); @@ -711,3 +734,36 @@ fn try_resolve_instance(locals: &[LocalDecl], func: &Operand) -> Result bool { + // Retrieve layouts to assess compatibility. + let from_ty_info = PointeeInfo::from_ty(*from_ty); + let to_ty_info = PointeeInfo::from_ty(*to_ty); + if let (Ok(from_ty_info), Ok(to_ty_info)) = (from_ty_info, to_ty_info) { + let from_ty_layout = match from_ty_info.layout() { + PointeeLayout::Sized { layout } => layout, + PointeeLayout::Slice { element_layout } => element_layout, + PointeeLayout::TraitObject => return false, + }; + let to_ty_layout = match to_ty_info.layout() { + PointeeLayout::Sized { layout } => layout, + PointeeLayout::Slice { element_layout } => element_layout, + PointeeLayout::TraitObject => return false, + }; + // Ensure `to_ty_layout` does not have a larger size. + if to_ty_layout.len() <= from_ty_layout.len() { + // Check data and padding bytes pair-wise. + if from_ty_layout.iter().zip(to_ty_layout.iter()).all( + |(from_ty_layout_byte, to_ty_layout_byte)| { + // Make sure all data and padding bytes match. + from_ty_layout_byte == to_ty_layout_byte + }, + ) { + return true; + } + } + }; + false +} diff --git a/tests/expected/uninit/access-padding-via-cast/expected b/tests/expected/uninit/access-padding-via-cast/expected index 12c5c0a4a439..e02883b26cdf 100644 --- a/tests/expected/uninit/access-padding-via-cast/expected +++ b/tests/expected/uninit/access-padding-via-cast/expected @@ -1,4 +1,4 @@ -Failed Checks: Undefined Behavior: Reading from an uninitialized pointer of type `*mut [u8; 4]` +Failed Checks: Kani does not support reasoning about memory initialization in presence of mutable raw pointer casts that could cause delayed UB. VERIFICATION:- FAILED diff --git a/tests/expected/uninit/delayed-ub/delayed-ub.rs b/tests/expected/uninit/delayed-ub/delayed-ub.rs new file mode 100644 index 000000000000..bfed0a1f39a1 --- /dev/null +++ b/tests/expected/uninit/delayed-ub/delayed-ub.rs @@ -0,0 +1,14 @@ +// Copyright Kani Contributors +// SPDX-License-Identifier: Apache-2.0 OR MIT +// kani-flags: -Z ghost-state -Z uninit-checks + +/// Checks that Kani rejects mutable pointer casts between types of different padding. +#[kani::proof] +fn invalid_value() { + unsafe { + let mut value: u128 = 0; + let ptr = &mut value as *mut _ as *mut (u8, u32, u64); + *ptr = (4, 4, 4); // This assignment itself does not cause UB... + let c: u128 = value; // ...but this reads a padding value! + } +} diff --git a/tests/expected/uninit/delayed-ub/expected b/tests/expected/uninit/delayed-ub/expected new file mode 100644 index 000000000000..e02883b26cdf --- /dev/null +++ b/tests/expected/uninit/delayed-ub/expected @@ -0,0 +1,5 @@ +Failed Checks: Kani does not support reasoning about memory initialization in presence of mutable raw pointer casts that could cause delayed UB. + +VERIFICATION:- FAILED + +Complete - 0 successfully verified harnesses, 1 failures, 1 total. \ No newline at end of file diff --git a/tests/perf/s2n-quic b/tests/perf/s2n-quic index 37335c196fb5..cd20ac16f5e4 160000 --- a/tests/perf/s2n-quic +++ b/tests/perf/s2n-quic @@ -1 +1 @@ -Subproject commit 37335c196fb5755dcbe2532e5a3820e46906d5ea +Subproject commit cd20ac16f5e4477238164074d2ed5b94ca8ba4fd