49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
# Test Case: Reserved Inode Format Rejection
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**Test ID**: TC113-corrupted-inode
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**Category**: Error Handling
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**Priority**: Critical
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## Objective
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Verify a checksum-valid image mounts, but lookup/open of the resolved
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`/inode-target.txt` inode with reserved `i_format` bit `0x8000` fails with
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`EOPNOTSUPP`; an unaffected file must remain readable.
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## Fixture Qualification
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```sh
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work=$(mktemp -d /tmp/repo22-tc113.XXXXXX)
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tests/prepare_error_fixtures.sh "$work/fixtures"
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cc -O2 -Wall -Wextra -std=c17 tests/read_probe.c -o "$work/read_probe"
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python3 tests/erofs_fixture.py inspect \
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"$work/fixtures/bad-inode-format.erofs" --path /inode-target.txt
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grep '^bad-inode-format ' "$work/fixtures/fixture-evidence.txt"
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sha256 -q "$work/fixtures/bad-inode-format.erofs"
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```
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The mutator resolves the root dirent, calculates the inode byte offset from the
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metadata block and NID, asserts the old format, sets only reserved bit
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`0x8000`, recomputes CRC32C, and preserves provider length.
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## FreeBSD Procedure
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```sh
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mkdir "$work/mnt"
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unit=$(mdconfig -a -t vnode -f "$work/fixtures/bad-inode-format.erofs")
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mount -t erofs -o ro "/dev/$unit" "$work/mnt"
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cmp "$work/fixtures/source/control.txt" "$work/mnt/control.txt"
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truss -o "$work/read.truss" "$work/read_probe" expect-error \
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"$work/mnt/inode-target.txt" 45 | tee "$work/error.out"
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grep -q 'expected_errno=45' "$work/error.out"
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grep -E '(openat|read).*ERR#45' "$work/read.truss"
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cmp "$work/fixtures/source/control.txt" "$work/mnt/control.txt"
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umount "$work/mnt"
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mdconfig -d -u "${unit#md}"
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```
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## Expected Results
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Only the target returns errno 45 (`EOPNOTSUPP`). The mount remains usable and
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cleans up fully.
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