Alice Ryhl 6e80d044b3 FROMGIT: rust: uaccess: add UserSliceReader::strcpy_into_buf ...

This patch adds a more convenient method for reading C strings from
userspace. Logic is added to NUL-terminate the buffer when necessary so
that a &CStr can be returned.

Note that we treat attempts to read past `self.length` as a fault, so
this returns EFAULT if that limit is exceeded before `buf.len()` is
reached.

Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Link: https://lore.kernel.org/r/20250616-strncpy-from-user-v5-2-2d3fb0e1f5af@google.com
[ Use `from_mut` to clean `clippy::ref_as_ptr` lint. Reworded
  title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Bug: 414339114
(cherry picked from commit 17bbbefbf6715a543ff4713e26f7b8e6b7a876d6
 https://github.com/Rust-for-Linux/linux.git rust-next)
Change-Id: I285c99788ff2e2bc3f9f9b6bbc2746dd454002f5
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

2025-07-15 11:45:55 -07:00

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