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Be more precise about mmap and undefined behavior.

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`mmap` doesn't *always* cause undefined behavior; it depends on the
details of how you use it.
This commit is contained in:
Dan Gohman 2021-07-27 16:58:38 -07:00
parent 1f8a450cdd
commit 6b4dbdbf47
1 changed files with 3 additions and 3 deletions
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6
library/std/src/os/unix/io/mod.rs
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@ -32,9 +32,9 @@
//! other code using that file descriptor.
//! This list doesn't include `mmap`, since `mmap` does do a proper borrow of
//! its file descriptor argument. That said, `mmap` is unsafe for other
//! reasons: it operates on raw pointers, and it has undefined behavior if the
//! underlying storage is mutated. Mutations may come from other processes, or
//! from the same process if the API provides `BorrowedFd` access, since as
//! reasons: it operates on raw pointers, and it can have undefined behavior if
//! the underlying storage is mutated. Mutations may come from other processes,
//! or from the same process if the API provides `BorrowedFd` access, since as
//! mentioned earlier, `BorrowedFd` values may be used in APIs which provide
//! safe access to any system call. Consequently, code using `mmap` and
//! presenting a safe API must take full responsibility for ensuring that safe