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/zerocopy/src/deprecated.rs | 281 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 281 insertions(+) create mode 100644 rust/zerocopy/src/deprecated.rs (limited to 'rust/zerocopy/src/deprecated.rs') diff --git a/rust/zerocopy/src/deprecated.rs b/rust/zerocopy/src/deprecated.rs new file mode 100644 index 000000000..59ddd35c7 --- /dev/null +++ b/rust/zerocopy/src/deprecated.rs @@ -0,0 +1,281 @@ +// SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT +// +// Copyright 2024 The Fuchsia Authors +// +// Licensed under the 2-Clause BSD License , Apache License, Version 2.0 +// , or the MIT +// license , at your option. +// This file may not be copied, modified, or distributed except according to +// those terms. + +//! Deprecated items. These are kept separate so that they don't clutter up +//! other modules. + +use super::*; + +impl Ref +where + B: ByteSlice, + T: KnownLayout + Immutable + ?Sized, +{ + #[deprecated(since = "0.8.0", note = "renamed to `Ref::from_bytes`")] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new(bytes: B) -> Option> { + Self::from_bytes(bytes).ok() + } +} + +impl Ref +where + B: SplitByteSlice, + T: KnownLayout + Immutable + ?Sized, +{ + #[deprecated(since = "0.8.0", note = "renamed to `Ref::from_prefix`")] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_from_prefix(bytes: B) -> Option<(Ref, B)> { + Self::from_prefix(bytes).ok() + } +} + +impl Ref +where + B: SplitByteSlice, + T: KnownLayout + Immutable + ?Sized, +{ + #[deprecated(since = "0.8.0", note = "renamed to `Ref::from_suffix`")] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_from_suffix(bytes: B) -> Option<(B, Ref)> { + Self::from_suffix(bytes).ok() + } +} + +impl Ref +where + B: ByteSlice, + T: Unaligned + KnownLayout + Immutable + ?Sized, +{ + #[deprecated( + since = "0.8.0", + note = "use `Ref::from_bytes`; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_unaligned(bytes: B) -> Option> { + Self::from_bytes(bytes).ok() + } +} + +impl Ref +where + B: SplitByteSlice, + T: Unaligned + KnownLayout + Immutable + ?Sized, +{ + #[deprecated( + since = "0.8.0", + note = "use `Ref::from_prefix`; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_unaligned_from_prefix(bytes: B) -> Option<(Ref, B)> { + Self::from_prefix(bytes).ok() + } +} + +impl Ref +where + B: SplitByteSlice, + T: Unaligned + KnownLayout + Immutable + ?Sized, +{ + #[deprecated( + since = "0.8.0", + note = "use `Ref::from_suffix`; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_unaligned_from_suffix(bytes: B) -> Option<(B, Ref)> { + Self::from_suffix(bytes).ok() + } +} + +impl Ref +where + B: ByteSlice, + T: Immutable, +{ + #[deprecated(since = "0.8.0", note = "`Ref::from_bytes` now supports slices")] + #[doc(hidden)] + #[inline(always)] + pub fn new_slice(bytes: B) -> Option> { + Self::from_bytes(bytes).ok() + } +} + +impl Ref +where + B: ByteSlice, + T: Unaligned + Immutable, +{ + #[deprecated( + since = "0.8.0", + note = "`Ref::from_bytes` now supports slices; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[inline(always)] + pub fn new_slice_unaligned(bytes: B) -> Option> { + Ref::from_bytes(bytes).ok() + } +} + +impl<'a, B, T> Ref +where + B: 'a + IntoByteSlice<'a>, + T: FromBytes + Immutable, +{ + #[deprecated(since = "0.8.0", note = "`Ref::into_ref` now supports slices")] + #[doc(hidden)] + #[inline(always)] + pub fn into_slice(self) -> &'a [T] { + Ref::into_ref(self) + } +} + +impl<'a, B, T> Ref +where + B: 'a + IntoByteSliceMut<'a>, + T: FromBytes + IntoBytes + Immutable, +{ + #[deprecated(since = "0.8.0", note = "`Ref::into_mut` now supports slices")] + #[doc(hidden)] + #[inline(always)] + pub fn into_mut_slice(self) -> &'a mut [T] { + Ref::into_mut(self) + } +} + +impl Ref +where + B: SplitByteSlice, + T: Immutable, +{ + #[deprecated(since = "0.8.0", note = "replaced by `Ref::from_prefix_with_elems`")] + #[must_use = "has no side effects"] + #[doc(hidden)] + #[inline(always)] + pub fn new_slice_from_prefix(bytes: B, count: usize) -> Option<(Ref, B)> { + Ref::from_prefix_with_elems(bytes, count).ok() + } + + #[deprecated(since = "0.8.0", note = "replaced by `Ref::from_suffix_with_elems`")] + #[must_use = "has no side effects"] + #[doc(hidden)] + #[inline(always)] + pub fn new_slice_from_suffix(bytes: B, count: usize) -> Option<(B, Ref)> { + Ref::from_suffix_with_elems(bytes, count).ok() + } +} + +impl Ref +where + B: SplitByteSlice, + T: Unaligned + Immutable, +{ + #[deprecated( + since = "0.8.0", + note = "use `Ref::from_prefix_with_elems`; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_slice_unaligned_from_prefix(bytes: B, count: usize) -> Option<(Ref, B)> { + Ref::from_prefix_with_elems(bytes, count).ok() + } + + #[deprecated( + since = "0.8.0", + note = "use `Ref::from_suffix_with_elems`; for `T: Unaligned`, the returned `CastError` implements `Into`" + )] + #[doc(hidden)] + #[must_use = "has no side effects"] + #[inline(always)] + pub fn new_slice_unaligned_from_suffix(bytes: B, count: usize) -> Option<(B, Ref)> { + Ref::from_suffix_with_elems(bytes, count).ok() + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + #[allow(deprecated)] + fn test_deprecated_ref_methods() { + let bytes = &[0u8; 1][..]; + let bytes_slice = &[0u8; 4][..]; + + let r: Option> = Ref::new(bytes); + assert!(r.is_some()); + + let r: Option<(Ref<&[u8], u8>, &[u8])> = Ref::new_from_prefix(bytes); + assert!(r.is_some()); + + let r: Option<(&[u8], Ref<&[u8], u8>)> = Ref::new_from_suffix(bytes); + assert!(r.is_some()); + + let r: Option> = Ref::new_unaligned(bytes); + assert!(r.is_some()); + + let r: Option<(Ref<&[u8], u8>, &[u8])> = Ref::new_unaligned_from_prefix(bytes); + assert!(r.is_some()); + + let r: Option<(&[u8], Ref<&[u8], u8>)> = Ref::new_unaligned_from_suffix(bytes); + assert!(r.is_some()); + + let r: Option> = Ref::new_slice(bytes_slice); + assert!(r.is_some()); + + let r: Option> = Ref::new_slice_unaligned(bytes_slice); + assert!(r.is_some()); + + let r: Option<(Ref<&[u8], [u8]>, &[u8])> = Ref::new_slice_from_prefix(bytes_slice, 1); + assert!(r.is_some()); + + let r: Option<(&[u8], Ref<&[u8], [u8]>)> = Ref::new_slice_from_suffix(bytes_slice, 1); + assert!(r.is_some()); + + let r: Option<(Ref<&[u8], [u8]>, &[u8])> = + Ref::new_slice_unaligned_from_prefix(bytes_slice, 1); + assert!(r.is_some()); + + let r: Option<(&[u8], Ref<&[u8], [u8]>)> = + Ref::new_slice_unaligned_from_suffix(bytes_slice, 1); + assert!(r.is_some()); + } + + #[test] + #[allow(deprecated)] + fn test_deprecated_into_slice() { + let bytes = &[0u8; 4][..]; + let r: Ref<&[u8], [u8]> = Ref::from_bytes(bytes).unwrap(); + let slice: &[u8] = r.into_slice(); + assert_eq!(slice.len(), 4); + } + + #[test] + #[allow(deprecated)] + fn test_deprecated_into_mut_slice() { + let mut bytes = [0u8; 4]; + let r: Ref<&mut [u8], [u8]> = Ref::from_bytes(&mut bytes[..]).unwrap(); + let slice: &mut [u8] = r.into_mut_slice(); + assert_eq!(slice.len(), 4); + } +} -- cgit v1.3.1