Merge tag 'driver-core-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Pull driver core updates from Danilo Krummrich:
 "Core:

   - Add TAINT_FORCED_BIND to taint the kernel and driver module before
     manual sysfs bind/unbind operations; make add_taint_module()
     available to driver core and update taint decoding tools and
     documentation

   - Constify device_show/store_*() attribute parameters and adapt x86
     MCE and perf users to prepare for const dev_ext_attribute instances

   - Fix UAF in NUMA access node registration failure handling by
     dropping the device reference with put_device() instead of directly
     freeing the node

  debugfs:

   - Make debugfs_create_str() read-only to eliminate double-free races
     between concurrent writers; reject writable modes; convert
     interconnect and SoundWire users to local file operations with
     mutex-protected strings

  kobject:

   - Fix out-of-bounds access in kobject_action_type() when parsing
     action strings containing embedded NUL bytes

   - Fix the kobject_set_name() reference in kset_register() kernel-doc

  Rust:

   - DMA:

      - Tie Coherent, CoherentBox and CoherentHandle to the device's
        bound lifetime to prevent retaining DMA allocations beyond
        driver unbind; propagate the lifetime through nova-core and the
        DMA sample driver

   - I/O:

      - Require explicit base types for registers and replace relative
        registers with typed subregion projections; reimplement
        register!() as a proc macro, support registers using existing
        types without inline bitfields, and convert nova-core, Tyr and
        the PCI sample; add AsRepr/AsReprMut and transmute helpers with
        deferred size checks for representation conversions

      - Wrap ResourceSize in a transparent newtype with explicit
        conversions, including checked conversion to usize

   - PCI:

      - Add typed PCIe extended capability lookup and SR-IOV accessors
        for the First VF Offset and decoded VF BAR addresses and widths,
        keeping raw SR-IOV registers private to preserve PCI core
        ownership of their state

   - scatterlist:

      - Honor the device's maximum segment size as well as the DMA
        mapping limit when constructing SG tables

      - Return u32 from SGEntry::dma_len() to match the C segment length
        type

   - misc:

      - Validate auxiliary DeviceId name length explicitly to improve
        compile-time diagnostics for oversized device ID table entries

      - Drop unnecessary 'static bounds from debugfs ScopedDir file
        creation methods to support data containing non-'static
        references, including DMA buffers

  Misc:

   - Add Johan Hovold as driver core maintainer

   - Simplify platform_device_alloc() by returning early on allocation
     failure

   - Fix typos in driver core and kernfs comments"

* tag 'driver-core-7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (41 commits)
  rust: pci: add extended capability and SR-IOV support
  kobject: Fix the kobj_set_name reference in kset_register() kernel-doc
  rust: io: convert ResourceSize into a transparent newtype
  rust: scatterlist: return u32 from SGEntry::dma_len()
  MAINTAINERS: add myself as driver core maintainer
  debugfs: make debugfs_create_str() read-only
  soundwire: debugfs: replace writable string helper
  interconnect: debugfs: replace writable string helper
  docs: admin-guide: Handle TAINT_FORCED_BIND when parsing /proc/sys/kernel/tainted
  driver core: platform: Simplify platform_device_alloc()
  kobject: fix out-of-bounds access in kobject_action_type()
  rust: scatterlist: honor the device's maximum segment size
  driver core: add TAINT_FORCED_BIND for when userspace manually messes with devices and drivers
  module: fix up documentation for add_taint() and add_taint_module()
  module: pull out add_taint_module() to be public
  driver core: Constify the signature of device_show/store_*()
  drivers: perf: Use __DEVICE_ATTR() macro to initialize dev_ext_attribute
  x86/mce: Use __DEVICE_ATTR() macro to initialize dev_ext_attribute
  rust: auxiliary: validate DeviceId name length
  driver core: fix typos in comments
  ...

2 files changed, 15 insertions, 18 deletions

diff --git a/rust/kernel/debugfs/entry.rs b/rust/kernel/debugfs/entry.rs
index 46aad64896ec..88a870d8c295 100644
--- a/rust/kernel/debugfs/entry.rs
+++ b/rust/kernel/debugfs/entry.rs
@@ -74,7 +74,7 @@ impl Entry<'static> {
                 parent.as_ptr(),
                 core::ptr::from_ref(data) as *mut c_void,
                 core::ptr::null(),
-                &**file_ops,
+                file_ops.fops(),
             )
         };
 
@@ -127,7 +127,7 @@ impl<'a> Entry<'a> {
                 parent.as_ptr(),
                 core::ptr::from_ref(data) as *mut c_void,
                 core::ptr::null(),
-                &**file_ops,
+                file_ops.fops(),
             )
         };
 
diff --git a/rust/kernel/debugfs/file_ops.rs b/rust/kernel/debugfs/file_ops.rs
index f15908f71c4a..47acc4851d47 100644
--- a/rust/kernel/debugfs/file_ops.rs
+++ b/rust/kernel/debugfs/file_ops.rs
@@ -20,9 +20,6 @@ use crate::{
 
 use core::marker::PhantomData;
 
-#[cfg(CONFIG_DEBUG_FS)]
-use core::ops::Deref;
-
 /// # Invariant
 ///
 /// `FileOps<T>` will always contain an `operations` which is safe to use for a file backed
@@ -30,7 +27,7 @@ use core::ops::Deref;
 /// into a reference.
 pub(super) struct FileOps<T> {
     #[cfg(CONFIG_DEBUG_FS)]
-    operations: bindings::file_operations,
+    operations: &'static bindings::file_operations,
     #[cfg(CONFIG_DEBUG_FS)]
     mode: u16,
     _phantom: PhantomData<T>,
@@ -41,7 +38,7 @@ impl<T> FileOps<T> {
     ///
     /// The caller asserts that the provided `operations` is safe to use for a file whose
     /// inode has a pointer to `T` in its private data that is safe to convert into a reference.
-    const unsafe fn new(operations: bindings::file_operations, mode: u16) -> Self {
+    const unsafe fn new(operations: &'static bindings::file_operations, mode: u16) -> Self {
         Self {
             #[cfg(CONFIG_DEBUG_FS)]
             operations,
@@ -65,11 +62,11 @@ impl<T: Adapter> FileOps<T> {
 }
 
 #[cfg(CONFIG_DEBUG_FS)]
-impl<T> Deref for FileOps<T> {
-    type Target = bindings::file_operations;
-
-    fn deref(&self) -> &Self::Target {
-        &self.operations
+impl<T> FileOps<T> {
+    /// Returns a `'static` reference to the inner `file_operations`.
+    #[inline]
+    pub(crate) fn fops(&self) -> &'static bindings::file_operations {
+        self.operations
     }
 }
 
@@ -130,7 +127,7 @@ pub(crate) trait ReadFile<T> {
 
 impl<T: Writer + Sync> ReadFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             read: Some(bindings::seq_read),
             llseek: Some(bindings::seq_lseek),
             release: Some(bindings::single_release),
@@ -181,7 +178,7 @@ pub(crate) trait ReadWriteFile<T> {
 
 impl<T: Writer + Reader + Sync> ReadWriteFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             open: Some(writer_open::<T>),
             read: Some(bindings::seq_read),
             write: Some(write::<T>),
@@ -238,7 +235,7 @@ pub(crate) trait WriteFile<T> {
 
 impl<T: Reader + Sync> WriteFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             open: Some(write_only_open),
             write: Some(write_only_write::<T>),
             llseek: Some(bindings::noop_llseek),
@@ -290,7 +287,7 @@ pub(crate) trait BinaryReadFile<T> {
 
 impl<T: BinaryWriter + Sync> BinaryReadFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             read: Some(blob_read::<T>),
             llseek: Some(bindings::default_llseek),
             open: Some(bindings::simple_open),
@@ -344,7 +341,7 @@ pub(crate) trait BinaryWriteFile<T> {
 
 impl<T: BinaryReader + Sync> BinaryWriteFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             write: Some(blob_write::<T>),
             llseek: Some(bindings::default_llseek),
             open: Some(bindings::simple_open),
@@ -368,7 +365,7 @@ pub(crate) trait BinaryReadWriteFile<T> {
 
 impl<T: BinaryWriter + BinaryReader + Sync> BinaryReadWriteFile<T> for T {
     const FILE_OPS: FileOps<T> = {
-        let operations = bindings::file_operations {
+        let operations = &bindings::file_operations {
             read: Some(blob_read::<T>),
             write: Some(blob_write::<T>),
             llseek: Some(bindings::default_llseek),