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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>
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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>
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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>
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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>
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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>
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`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>
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