https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290547
Bug ID: 290547
Summary: [fusefs]: kernel unconditionally sends FUSE_SETXATTR
requests in extended format
Product: Base System
Version: 15.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
In FUSE protocols 7.1 through 7.32, the FUSE_SETXATTR request includes an
8-byte header. Protocol 7.33 optionally extends that to 16 bytes, but only if
the server sets FUSE_SETXATTR_EXT in its reply to FUSE_INIT.
Ever since d5e3cf41e89400e75da87aad0cc9bde108e2573b FreeBSD 15.0-CURRENT has
used the extended format. However, it has wrongly used that extended format
even if the server does not set FUSE_SETXATTR_EXT. FreeBSD 14.3 and earlier
are unaffected.
This bug only affects file systems that use protocol 7.33 or later, and do
_not_ set FUSE_SETXATTR_EXT. So anything using libfuse is unaffected, as are
any Rust-based file systems using the popular fuse3 or fuser crates. I don't
know of any off-the-shelf file systems that are affected.
This issue was originally reported on Github by user CismonX.
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