feat: replace devid key by a name key - #188
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Co-authored-by: GLM <noreply@z.ai>
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe change replaces device/inode identity with name/inode identity across the daemon and eBPF components. It removes the ChangesInode identity and directory scanning
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The PR changes device-blocking keys and directory filtering, but the current head can still abort daemon startup on hook-attach failure, over-block unrelated files across filesystems, miss blocked aliases, and leave blocked directory entries visible or unfiltered. These are concrete availability and access-control correctness risks, so the PR is not ready to merge until they are fixed or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant UserspaceLoader
participant Getdents64Exit
participant ScanDirent
participant UserDirentBuffer
UserspaceLoader->>Getdents64Exit: attach sys_exit_getdents64
Getdents64Exit->>ScanDirent: scan entries through bpf_loop
ScanDirent->>UserDirentBuffer: read entries and merge blocked records
ScanDirent-->>Getdents64Exit: return scan status
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (3 passed)
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Actionable comments posted: 7
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Inline comments:
In `@crates/cardwire-ebpf-userspace/src/lib.rs`:
- Around line 132-152: Update the cardwire_sys_exit_getdents64 load-and-attach
flow so did_sys_exit_getdents64_success is set only after attach succeeds.
Handle attach errors like load errors by logging the failure and continuing in
weakened mode instead of propagating through EbpfBlocker::new; preserve the
successful path when both operations complete.
In `@crates/cardwire-ebpf/src/helpers.rs`:
- Around line 355-371: Update the blocked-entry handling in the getdents scan
logic around scan.prev_ptr so the first blocked record is also hidden rather
than left visible when no previous record exists. Preserve the existing
previous-record reclen merge path, and implement a safe first-record strategy
that advances buffer bookkeeping or neutralizes the record’s inode/type/name so
it cannot be resolved.
- Around line 313-347: Update the directory scanning flow around scan_dirent so
a 32768-byte buffer cannot stop after 512 entries while still reporting success:
raise the bpf_loop iteration bound to cover the maximum possible dirent count,
or set an explicit failure status whenever scanning ends before scan.end. Also
set the same appropriate read-failure status on failed header reads that is used
for failed name reads, so both malformed input paths fail closed consistently.
- Around line 56-66: Update inode_permission keying so blocked-inode lookups
cannot depend solely on inode->i_dentry.first when an inode has multiple
aliases; either use an inode-only key, ensure CW_BLOCKED_INO insertion covers
every alias, or obtain the caller’s dentry from a hook that provides it.
Preserve dentry_key behavior only when the selected key is guaranteed to match
the caller path.
- Line 360: Replace the hard-coded 16-byte offset in the reclen_ptr calculation
near scan.prev_ptr with an offset derived from the linux_dirent64 type and its
d_reclen field, using the appropriate field-offset mechanism for this codebase.
Preserve the existing pointer arithmetic and write behavior while ensuring the
offset tracks the struct layout.
In `@crates/cardwire-ebpf/src/main.rs`:
- Around line 375-393: Update the bpf_loop invocation in the scan flow to use an
unsafe C callback matching the kernel prototype, with u64 as the first argument,
*mut c_void context, and i64 return type, while preserving the scan_dirent
behavior. Store the c_long result from bpf_loop, distinguish normal early
termination from zero-progress or failed scans, and log and return an error for
negative results instead of reporting success.
In `@crates/cardwire-ebpf/src/maps.rs`:
- Around line 38-48: Update InodeKey and its corresponding userspace
representation to include a parent-directory inode discriminator alongside name
and ino, and update all key construction and lookup paths to populate it from
getdents64 entries. Preserve identical #[repr(C)] field ordering and layout
across kernel and userspace so raw-byte hashing remains consistent, preventing
matching entries from different directories or filesystems from sharing a map
slot.
Apply the same fix in `@crates/cardwire-ebpf/src/maps.rs` around lines 43 - 48.
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ℹ️ Review info
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Run ID: ea7258b3-8acb-4e50-95c1-5cfb3f955d99
📒 Files selected for processing (5)
crates/cardwire-daemon/src/core/inode.rscrates/cardwire-ebpf-userspace/src/lib.rscrates/cardwire-ebpf/src/helpers.rscrates/cardwire-ebpf/src/main.rscrates/cardwire-ebpf/src/maps.rs
- raise the bpf_loop bound to 1366 entries (32768/24+1) so a full buffer can never be silently truncated, and reject records shorter than their own header - restore the write errno in the exit hook's reclen log and warn on a negative bpf_loop return - key builders now report why they failed: anonymous inodes (epoll, eventfd, dma-buf) log at debug instead of spamming errors, real probe read failures still log at error - derive the d_reclen offset from the type instead of a hard-coded 16 - sys_exit/sys_enter_getdents64: attach failures now degrade to weakened mode instead of aborting the daemon, and the enter hook only loads once the exit hook is attached Co-authored-by: GLM <noreply@z.ai>
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Description
Please include a summary of the changes and if applicable, a related issue.
If this PR introduce a new feature, explain your motivations
Fixes # (issue)
TODO
Checklist: