From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- rust/syn/op.rs | 221 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 221 insertions(+) create mode 100644 rust/syn/op.rs (limited to 'rust/syn/op.rs') diff --git a/rust/syn/op.rs b/rust/syn/op.rs new file mode 100644 index 000000000..73dada3fa --- /dev/null +++ b/rust/syn/op.rs @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: Apache-2.0 OR MIT + +ast_enum! { + /// A binary operator: `+`, `+=`, `&`. + #[cfg_attr(docsrs, doc(cfg(any(feature = "full", feature = "derive"))))] + #[non_exhaustive] + pub enum BinOp { + /// The `+` operator (addition) + Add(Token![+]), + /// The `-` operator (subtraction) + Sub(Token![-]), + /// The `*` operator (multiplication) + Mul(Token![*]), + /// The `/` operator (division) + Div(Token![/]), + /// The `%` operator (modulus) + Rem(Token![%]), + /// The `&&` operator (logical and) + And(Token![&&]), + /// The `||` operator (logical or) + Or(Token![||]), + /// The `^` operator (bitwise xor) + BitXor(Token![^]), + /// The `&` operator (bitwise and) + BitAnd(Token![&]), + /// The `|` operator (bitwise or) + BitOr(Token![|]), + /// The `<<` operator (shift left) + Shl(Token![<<]), + /// The `>>` operator (shift right) + Shr(Token![>>]), + /// The `==` operator (equality) + Eq(Token![==]), + /// The `<` operator (less than) + Lt(Token![<]), + /// The `<=` operator (less than or equal to) + Le(Token![<=]), + /// The `!=` operator (not equal to) + Ne(Token![!=]), + /// The `>=` operator (greater than or equal to) + Ge(Token![>=]), + /// The `>` operator (greater than) + Gt(Token![>]), + /// The `+=` operator + AddAssign(Token![+=]), + /// The `-=` operator + SubAssign(Token![-=]), + /// The `*=` operator + MulAssign(Token![*=]), + /// The `/=` operator + DivAssign(Token![/=]), + /// The `%=` operator + RemAssign(Token![%=]), + /// The `^=` operator + BitXorAssign(Token![^=]), + /// The `&=` operator + BitAndAssign(Token![&=]), + /// The `|=` operator + BitOrAssign(Token![|=]), + /// The `<<=` operator + ShlAssign(Token![<<=]), + /// The `>>=` operator + ShrAssign(Token![>>=]), + } +} + +ast_enum! { + /// A unary operator: `*`, `!`, `-`. + #[cfg_attr(docsrs, doc(cfg(any(feature = "full", feature = "derive"))))] + #[non_exhaustive] + pub enum UnOp { + /// The `*` operator for dereferencing + Deref(Token![*]), + /// The `!` operator for logical inversion + Not(Token![!]), + /// The `-` operator for negation + Neg(Token![-]), + } +} + +#[cfg(feature = "parsing")] +pub(crate) mod parsing { + use crate::error::Result; + use crate::op::{BinOp, UnOp}; + use crate::parse::{Parse, ParseStream}; + + #[cfg_attr(docsrs, doc(cfg(feature = "parsing")))] + impl Parse for BinOp { + fn parse(input: ParseStream) -> Result { + if input.peek(Token![+=]) { + input.parse().map(BinOp::AddAssign) + } else if input.peek(Token![-=]) { + input.parse().map(BinOp::SubAssign) + } else if input.peek(Token![*=]) { + input.parse().map(BinOp::MulAssign) + } else if input.peek(Token![/=]) { + input.parse().map(BinOp::DivAssign) + } else if input.peek(Token![%=]) { + input.parse().map(BinOp::RemAssign) + } else if input.peek(Token![^=]) { + input.parse().map(BinOp::BitXorAssign) + } else if input.peek(Token![&=]) { + input.parse().map(BinOp::BitAndAssign) + } else if input.peek(Token![|=]) { + input.parse().map(BinOp::BitOrAssign) + } else if input.peek(Token![<<=]) { + input.parse().map(BinOp::ShlAssign) + } else if input.peek(Token![>>=]) { + input.parse().map(BinOp::ShrAssign) + } else if input.peek(Token![&&]) { + input.parse().map(BinOp::And) + } else if input.peek(Token![||]) { + input.parse().map(BinOp::Or) + } else if input.peek(Token![<<]) { + input.parse().map(BinOp::Shl) + } else if input.peek(Token![>>]) { + input.parse().map(BinOp::Shr) + } else if input.peek(Token![==]) { + input.parse().map(BinOp::Eq) + } else if input.peek(Token![<=]) { + input.parse().map(BinOp::Le) + } else if input.peek(Token![!=]) { + input.parse().map(BinOp::Ne) + } else if input.peek(Token![>=]) { + input.parse().map(BinOp::Ge) + } else if input.peek(Token![+]) { + input.parse().map(BinOp::Add) + } else if input.peek(Token![-]) { + input.parse().map(BinOp::Sub) + } else if input.peek(Token![*]) { + input.parse().map(BinOp::Mul) + } else if input.peek(Token![/]) { + input.parse().map(BinOp::Div) + } else if input.peek(Token![%]) { + input.parse().map(BinOp::Rem) + } else if input.peek(Token![^]) { + input.parse().map(BinOp::BitXor) + } else if input.peek(Token![&]) { + input.parse().map(BinOp::BitAnd) + } else if input.peek(Token![|]) { + input.parse().map(BinOp::BitOr) + } else if input.peek(Token![<]) { + input.parse().map(BinOp::Lt) + } else if input.peek(Token![>]) { + input.parse().map(BinOp::Gt) + } else { + Err(input.error("expected binary operator")) + } + } + } + + #[cfg_attr(docsrs, doc(cfg(feature = "parsing")))] + impl Parse for UnOp { + fn parse(input: ParseStream) -> Result { + let lookahead = input.lookahead1(); + if lookahead.peek(Token![*]) { + input.parse().map(UnOp::Deref) + } else if lookahead.peek(Token![!]) { + input.parse().map(UnOp::Not) + } else if lookahead.peek(Token![-]) { + input.parse().map(UnOp::Neg) + } else { + Err(lookahead.error()) + } + } + } +} + +#[cfg(feature = "printing")] +mod printing { + use crate::op::{BinOp, UnOp}; + use proc_macro2::TokenStream; + use quote::ToTokens; + + #[cfg_attr(docsrs, doc(cfg(feature = "printing")))] + impl ToTokens for BinOp { + fn to_tokens(&self, tokens: &mut TokenStream) { + match self { + BinOp::Add(t) => t.to_tokens(tokens), + BinOp::Sub(t) => t.to_tokens(tokens), + BinOp::Mul(t) => t.to_tokens(tokens), + BinOp::Div(t) => t.to_tokens(tokens), + BinOp::Rem(t) => t.to_tokens(tokens), + BinOp::And(t) => t.to_tokens(tokens), + BinOp::Or(t) => t.to_tokens(tokens), + BinOp::BitXor(t) => t.to_tokens(tokens), + BinOp::BitAnd(t) => t.to_tokens(tokens), + BinOp::BitOr(t) => t.to_tokens(tokens), + BinOp::Shl(t) => t.to_tokens(tokens), + BinOp::Shr(t) => t.to_tokens(tokens), + BinOp::Eq(t) => t.to_tokens(tokens), + BinOp::Lt(t) => t.to_tokens(tokens), + BinOp::Le(t) => t.to_tokens(tokens), + BinOp::Ne(t) => t.to_tokens(tokens), + BinOp::Ge(t) => t.to_tokens(tokens), + BinOp::Gt(t) => t.to_tokens(tokens), + BinOp::AddAssign(t) => t.to_tokens(tokens), + BinOp::SubAssign(t) => t.to_tokens(tokens), + BinOp::MulAssign(t) => t.to_tokens(tokens), + BinOp::DivAssign(t) => t.to_tokens(tokens), + BinOp::RemAssign(t) => t.to_tokens(tokens), + BinOp::BitXorAssign(t) => t.to_tokens(tokens), + BinOp::BitAndAssign(t) => t.to_tokens(tokens), + BinOp::BitOrAssign(t) => t.to_tokens(tokens), + BinOp::ShlAssign(t) => t.to_tokens(tokens), + BinOp::ShrAssign(t) => t.to_tokens(tokens), + } + } + } + + #[cfg_attr(docsrs, doc(cfg(feature = "printing")))] + impl ToTokens for UnOp { + fn to_tokens(&self, tokens: &mut TokenStream) { + match self { + UnOp::Deref(t) => t.to_tokens(tokens), + UnOp::Not(t) => t.to_tokens(tokens), + UnOp::Neg(t) => t.to_tokens(tokens), + } + } + } +} -- cgit v1.3.1