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zarzet
1d53609b51
Vendor the pinned Rustix package with an Android-only weak libc lookup so missing statx returns ENOSYS and uses the existing stat64 fallback. Add an isolated Android smoke test with a hidden symbol and a seccomp filter that kills raw statx probes. Verified 177 workspace tests, host Clippy, and ARM64 Android sandbox smoke test. ARM32 cross-target Clippy passes with the existing needless_return warning in binary.rs exempted; physical Android 10 ARM32 validation remains required.
31 lines
1.8 KiB
Markdown
Vendored
31 lines
1.8 KiB
Markdown
Vendored
# Rustix Android compatibility patch
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`rustix-1.1.4` is vendored from the pinned crates.io package using `cargo vendor`.
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Its upstream license files are retained. Cargo's workspace patch applies to both
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direct users and transitive dependencies such as `cap-std`.
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The original package checksum is
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`b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190`.
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The sole upstream source change is in `src/backend/libc/fs/syscalls.rs`: Android
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uses `weakcall!` for `statx`, rather than `weak_or_syscall!`. Bionic exports this
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function from API 30. On earlier releases, probing the raw syscall can terminate
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the app with `SIGSYS/SYS_SECCOMP` instead of returning an error (observed on
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Android 10 ARM32, syscall 397 during `read_audio_metadata`). Missing symbols now
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return `ENOSYS`, allowing the existing `fstat64`/`fstatat64` fallback. Newer Android
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continues to use Bionic's `statx`; non-Android targets retain upstream behavior.
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References:
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- [Bionic stat.h](https://android.googlesource.com/platform/bionic/+/refs/heads/main/libc/include/sys/stat.h)
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- [Upstream Rustix](https://github.com/bytecodealliance/rustix)
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When upgrading Rustix, check whether upstream has fixed this path before removing
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the patch. Keep the Android metadata smoke test and verify both APK ABIs.
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Run `bash scripts/check_android_statx.sh arm64-v8a` (or `armeabi-v7a`) with
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`ANDROID_NDK_HOME` set and a matching Android device connected through `adb`.
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The isolated test executable checks regular metadata access, then hides the libc
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symbol and blocks the raw syscall to exercise the legacy fallback. A final probe
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deliberately exits with `SIGSYS` to verify that the filter is active. Neither the
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symbol wrapper nor the filter is included in the application. This simulated
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sandbox check complements testing the APK on an actual older ARM32 device.
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