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Auto merge of #13247 - Soveu:sus-asm-options, r=y21
Add new check for passing pointers to an `asm!` block with `nomem` option changelog: Add new check for passing pointers to an `asm!` block with `nomem` option Continuing work from https://github.com/rust-lang/rust/pull/127063
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commit
e8ba5d1f71
6 changed files with 159 additions and 0 deletions
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@ -5758,6 +5758,7 @@ Released 2018-09-13
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[`pathbuf_init_then_push`]: https://rust-lang.github.io/rust-clippy/master/index.html#pathbuf_init_then_push
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[`pattern_type_mismatch`]: https://rust-lang.github.io/rust-clippy/master/index.html#pattern_type_mismatch
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[`permissions_set_readonly_false`]: https://rust-lang.github.io/rust-clippy/master/index.html#permissions_set_readonly_false
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[`pointers_in_nomem_asm_block`]: https://rust-lang.github.io/rust-clippy/master/index.html#pointers_in_nomem_asm_block
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[`positional_named_format_parameters`]: https://rust-lang.github.io/rust-clippy/master/index.html#positional_named_format_parameters
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[`possible_missing_comma`]: https://rust-lang.github.io/rust-clippy/master/index.html#possible_missing_comma
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[`precedence`]: https://rust-lang.github.io/rust-clippy/master/index.html#precedence
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@ -600,6 +600,7 @@ pub static LINTS: &[&crate::LintInfo] = &[
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crate::pathbuf_init_then_push::PATHBUF_INIT_THEN_PUSH_INFO,
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crate::pattern_type_mismatch::PATTERN_TYPE_MISMATCH_INFO,
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crate::permissions_set_readonly_false::PERMISSIONS_SET_READONLY_FALSE_INFO,
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crate::pointers_in_nomem_asm_block::POINTERS_IN_NOMEM_ASM_BLOCK_INFO,
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crate::precedence::PRECEDENCE_INFO,
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crate::ptr::CMP_NULL_INFO,
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crate::ptr::INVALID_NULL_PTR_USAGE_INFO,
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@ -287,6 +287,7 @@ mod pass_by_ref_or_value;
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mod pathbuf_init_then_push;
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mod pattern_type_mismatch;
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mod permissions_set_readonly_false;
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mod pointers_in_nomem_asm_block;
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mod precedence;
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mod ptr;
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mod ptr_offset_with_cast;
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@ -935,5 +936,6 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
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store.register_early_pass(|| Box::new(byte_char_slices::ByteCharSlice));
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store.register_early_pass(|| Box::new(cfg_not_test::CfgNotTest));
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store.register_late_pass(|_| Box::new(zombie_processes::ZombieProcesses));
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store.register_late_pass(|_| Box::new(pointers_in_nomem_asm_block::PointersInNomemAsmBlock));
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// add lints here, do not remove this comment, it's used in `new_lint`
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}
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88
clippy_lints/src/pointers_in_nomem_asm_block.rs
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88
clippy_lints/src/pointers_in_nomem_asm_block.rs
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@ -0,0 +1,88 @@
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use clippy_utils::diagnostics::span_lint_and_then;
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use rustc_ast::InlineAsmOptions;
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use rustc_hir::{Expr, ExprKind, InlineAsm, InlineAsmOperand};
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use rustc_lint::{LateContext, LateLintPass};
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use rustc_session::declare_lint_pass;
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use rustc_span::Span;
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declare_clippy_lint! {
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/// ### What it does
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/// Checks if any pointer is being passed to an asm! block with `nomem` option.
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///
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/// ### Why is this bad?
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/// `nomem` forbids any reads or writes to memory and passing a pointer suggests
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/// that either of those will happen.
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///
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/// ### Example
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/// ```no_run
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/// fn f(p: *mut u32) {
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/// unsafe { core::arch::asm!("mov [{p}], 42", p = in(reg) p, options(nomem, nostack)); }
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/// }
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/// ```
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/// Use instead:
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/// ```no_run
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/// fn f(p: *mut u32) {
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/// unsafe { core::arch::asm!("mov [{p}], 42", p = in(reg) p, options(nostack)); }
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/// }
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/// ```
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#[clippy::version = "1.81.0"]
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pub POINTERS_IN_NOMEM_ASM_BLOCK,
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suspicious,
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"pointers in nomem asm block"
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}
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declare_lint_pass!(PointersInNomemAsmBlock => [POINTERS_IN_NOMEM_ASM_BLOCK]);
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impl<'tcx> LateLintPass<'tcx> for PointersInNomemAsmBlock {
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
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if let ExprKind::InlineAsm(asm) = &expr.kind {
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check_asm(cx, asm);
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}
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}
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}
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fn check_asm(cx: &LateContext<'_>, asm: &InlineAsm<'_>) {
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if !asm.options.contains(InlineAsmOptions::NOMEM) {
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return;
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}
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let spans = asm
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.operands
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.iter()
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.filter(|(op, _span)| has_in_operand_pointer(cx, op))
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.map(|(_op, span)| *span)
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.collect::<Vec<Span>>();
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if spans.is_empty() {
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return;
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}
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span_lint_and_then(
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cx,
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POINTERS_IN_NOMEM_ASM_BLOCK,
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spans,
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"passing pointers to nomem asm block",
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additional_notes,
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);
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}
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fn has_in_operand_pointer(cx: &LateContext<'_>, asm_op: &InlineAsmOperand<'_>) -> bool {
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let asm_in_expr = match asm_op {
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InlineAsmOperand::SymStatic { .. }
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| InlineAsmOperand::Out { .. }
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| InlineAsmOperand::Const { .. }
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| InlineAsmOperand::SymFn { .. }
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| InlineAsmOperand::Label { .. } => return false,
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InlineAsmOperand::SplitInOut { in_expr, .. } => in_expr,
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InlineAsmOperand::In { expr, .. } | InlineAsmOperand::InOut { expr, .. } => expr,
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};
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// This checks for raw ptrs, refs and function pointers - the last one
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// also technically counts as reading memory.
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cx.typeck_results().expr_ty(asm_in_expr).is_any_ptr()
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}
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fn additional_notes(diag: &mut rustc_errors::Diag<'_, ()>) {
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diag.note("`nomem` means that no memory write or read happens inside the asm! block");
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diag.note("if this is intentional and no pointers are read or written to, consider allowing the lint");
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}
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33
tests/ui/pointers_in_nomem_asm_block.rs
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33
tests/ui/pointers_in_nomem_asm_block.rs
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@ -0,0 +1,33 @@
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//@ needs-asm-support
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#![warn(clippy::pointers_in_nomem_asm_block)]
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#![crate_type = "lib"]
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#![no_std]
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use core::arch::asm;
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unsafe fn nomem_bad(p: &i32) {
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asm!(
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"asdf {p1}, {p2}, {p3}",
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p1 = in(reg) p,
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//~^ ERROR: passing pointers to nomem asm block
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p2 = in(reg) p as *const _ as usize,
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p3 = in(reg) p,
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options(nomem, nostack, preserves_flags)
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);
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}
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unsafe fn nomem_good(p: &i32) {
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asm!("asdf {p}", p = in(reg) p, options(readonly, nostack, preserves_flags));
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let p = p as *const i32 as usize;
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asm!("asdf {p}", p = in(reg) p, options(nomem, nostack, preserves_flags));
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}
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unsafe fn nomem_bad2(p: &mut i32) {
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asm!("asdf {p}", p = in(reg) p, options(nomem, nostack, preserves_flags));
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//~^ ERROR: passing pointers to nomem asm block
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}
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unsafe fn nomem_fn(p: extern "C" fn()) {
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asm!("call {p}", p = in(reg) p, options(nomem));
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//~^ ERROR: passing pointers to nomem asm block
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}
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34
tests/ui/pointers_in_nomem_asm_block.stderr
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34
tests/ui/pointers_in_nomem_asm_block.stderr
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error: passing pointers to nomem asm block
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--> tests/ui/pointers_in_nomem_asm_block.rs:11:9
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LL | p1 = in(reg) p,
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| ^^^^^^^^^^^^^^
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...
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LL | p3 = in(reg) p,
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| ^^^^^^^^^^^^^^
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= note: `nomem` means that no memory write or read happens inside the asm! block
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= note: if this is intentional and no pointers are read or written to, consider allowing the lint
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= note: `-D clippy::pointers-in-nomem-asm-block` implied by `-D warnings`
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= help: to override `-D warnings` add `#[allow(clippy::pointers_in_nomem_asm_block)]`
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error: passing pointers to nomem asm block
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--> tests/ui/pointers_in_nomem_asm_block.rs:26:22
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LL | asm!("asdf {p}", p = in(reg) p, options(nomem, nostack, preserves_flags));
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| ^^^^^^^^^^^^^
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= note: `nomem` means that no memory write or read happens inside the asm! block
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= note: if this is intentional and no pointers are read or written to, consider allowing the lint
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error: passing pointers to nomem asm block
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--> tests/ui/pointers_in_nomem_asm_block.rs:31:22
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LL | asm!("call {p}", p = in(reg) p, options(nomem));
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| ^^^^^^^^^^^^^
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= note: `nomem` means that no memory write or read happens inside the asm! block
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= note: if this is intentional and no pointers are read or written to, consider allowing the lint
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error: aborting due to 3 previous errors
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