linux-stable.git/rust/kernel/fmt.rs, branch v7.3-rc2 Linux kernel stable tree rust: fmt: route {:p} through HashedPtr to prevent address leaks 2026-08-12T09:58:50+00:00 Ke Sun sunke@kylinos.cn 2026-08-10T06:35:43+00:00 643a7c306b8ce32743d4f94dd700c8588be37e66 Define a custom `kernel::fmt::Pointer` trait and `HashedPtr` wrapper so that `{:p}` formatting uses the kernel's `%p` hashed format instead of printing raw pointer values, preventing kernel address space leaks. Signed-off-by: Ke Sun <sunke@kylinos.cn> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260810-hashedptr-v15-2-eafd27d36476@kylinos.cn [ Fixed KUnit failure when the CRNG is not ready. Then, as suggested, replaced the `scnprintf` comment (with v16's), changed width to 100, replaced cast with `without_provenance`. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
Define a custom `kernel::fmt::Pointer` trait and `HashedPtr` wrapper
so that `{:p}` formatting uses the kernel's `%p` hashed format instead
of printing raw pointer values, preventing kernel address space leaks.

Signed-off-by: Ke Sun <sunke@kylinos.cn>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260810-hashedptr-v15-2-eafd27d36476@kylinos.cn
[ Fixed KUnit failure when the CRNG is not ready. Then, as suggested,
  replaced the `scnprintf` comment (with v16's), changed width to 100,
  replaced cast with `without_provenance`. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
rust: fmt: fix {:p} printing stack addresses 2026-08-12T09:55:52+00:00 Ke Sun sunke@kylinos.cn 2026-08-10T06:35:42+00:00 fb7d645176189d2b068d69861e230fa5aceb4922 The `impl_fmt_adapter_forward!` macro forwards `Pointer` for `Adapter<T>` by destructuring `self` into a local `t`, causing `{:p}` to print the address of that temporary stack variable rather than the actual pointer. Remove `Pointer` from the macro and provide a manual impl for `Adapter<&T>` that passes `self.0` directly. Signed-off-by: Ke Sun <sunke@kylinos.cn> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Gary Guo <gary@garyguo.net> Tested-by: Link Mauve <linkmauve@linkmauve.fr> Cc: stable@vger.kernel.org Fixes: c5cf01ba8dfe ("rust: support formatting of foreign types") Link: https://patch.msgid.link/20260810-hashedptr-v15-1-eafd27d36476@kylinos.cn Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
The `impl_fmt_adapter_forward!` macro forwards `Pointer` for
`Adapter<T>` by destructuring `self` into a local `t`, causing `{:p}`
to print the address of that temporary stack variable rather than the
actual pointer.

Remove `Pointer` from the macro and provide a manual impl for
`Adapter<&T>` that passes `self.0` directly.

Signed-off-by: Ke Sun <sunke@kylinos.cn>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Link Mauve <linkmauve@linkmauve.fr>
Cc: stable@vger.kernel.org
Fixes: c5cf01ba8dfe ("rust: support formatting of foreign types")
Link: https://patch.msgid.link/20260810-hashedptr-v15-1-eafd27d36476@kylinos.cn
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
rust: fmt: use vertical import style 2026-05-19T22:47:24+00:00 Ke Sun sunke@kylinos.cn 2026-05-12T09:21:21+00:00 fc1ce3afa2e61b4b15e71436ece91b0441a9f4f0 Switch single-line `use` imports in fmt.rs to vertical style for better readability and easier maintenance. Signed-off-by: Ke Sun <sunke@kylinos.cn> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260512-clean-fmt-use-v1-1-7ae7858192ac@kylinos.cn Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
Switch single-line `use` imports in fmt.rs to vertical style for
better readability and easier maintenance.

Signed-off-by: Ke Sun <sunke@kylinos.cn>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260512-clean-fmt-use-v1-1-7ae7858192ac@kylinos.cn
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
rust: fmt: Fix grammar in Adapter description 2026-01-04T22:51:35+00:00 Dirk Behme dirk.behme@de.bosch.com 2026-01-02T08:48:21+00:00 1e4e2a847f3c0bb3f34f3b20229be5c0214b80fa Add a missing `and` in the description of the `Adapter`. Fixes: c5cf01ba8dfe ("rust: support formatting of foreign types") Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Acked-by: Tamir Duberstein <tamird@gmail.com> Link: https://patch.msgid.link/20260102084821.1077864-1-dirk.behme@de.bosch.com [ Reworded for typo. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
Add a missing `and` in the description of the `Adapter`.

Fixes: c5cf01ba8dfe ("rust: support formatting of foreign types")
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Acked-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/20260102084821.1077864-1-dirk.behme@de.bosch.com
[ Reworded for typo. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
rust: support formatting of foreign types 2025-10-22T05:15:31+00:00 Tamir Duberstein tamird@gmail.com 2025-10-18T19:16:36+00:00 c5cf01ba8dfe9c0f631ace6f64ec436303783000 Introduce a `fmt!` macro which wraps all arguments in `kernel::fmt::Adapter` and a `kernel::fmt::Display` trait. This enables formatting of foreign types (like `core::ffi::CStr`) that do not implement `core::fmt::Display` due to concerns around lossy conversions which do not apply in the kernel. Suggested-by: Alice Ryhl <aliceryhl@google.com> Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Custom.20formatting/with/516476467 Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Benno Lossin <lossin@kernel.org> Signed-off-by: Tamir Duberstein <tamird@gmail.com> Link: https://patch.msgid.link/20251018-cstr-core-v18-15-9378a54385f8@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
Introduce a `fmt!` macro which wraps all arguments in
`kernel::fmt::Adapter` and a `kernel::fmt::Display` trait. This enables
formatting of foreign types (like `core::ffi::CStr`) that do not
implement `core::fmt::Display` due to concerns around lossy conversions
which do not apply in the kernel.

Suggested-by: Alice Ryhl <aliceryhl@google.com>
Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Custom.20formatting/with/516476467
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://patch.msgid.link/20251018-cstr-core-v18-15-9378a54385f8@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
rust: kernel: add `fmt` module 2025-07-20T23:16:35+00:00 Tamir Duberstein tamird@gmail.com 2025-07-04T20:14:53+00:00 bda947d613f1882c73ebb3ddda388459bab5902c `kernel::fmt` is a facade over `core::fmt` that can be used downstream, allowing future changes to the formatting machinery to be contained within the kernel crate without downstream code needing to be modified. Signed-off-by: Tamir Duberstein <tamird@gmail.com> Reviewed-by: Benno Lossin <lossin@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20250704-core-cstr-prepare-v1-2-a91524037783@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 
`kernel::fmt` is a facade over `core::fmt` that can be used downstream,
allowing future changes to the formatting machinery to be contained
within the kernel crate without downstream code needing to be modified.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250704-core-cstr-prepare-v1-2-a91524037783@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>