Fix second use-after-free in the rollback path; clang battery re-validated
build / build (clang, ) (push) Failing after 6s
build / build (clang, --enable-warnings) (push) Failing after 6s
build / build (gcc, ) (push) Failing after 6s
build / build (gcc, --enable-io-failure-emulation) (push) Failing after 6s
build / build (gcc, --enable-warnings) (push) Failing after 7s
build / out-of-tree (push) Failing after 6s
build / sanitizers (push) Failing after 5s
build / build (clang, ) (push) Failing after 6s
build / build (clang, --enable-warnings) (push) Failing after 6s
build / build (gcc, ) (push) Failing after 6s
build / build (gcc, --enable-io-failure-emulation) (push) Failing after 6s
build / build (gcc, --enable-warnings) (push) Failing after 7s
build / out-of-tree (push) Failing after 6s
build / sanitizers (push) Failing after 5s
ASan with halt_on_error caught a second dangling read on the exact path --rollback-fsck-changes exits through: fsck_rollback() called freemem(fs) at fsck/main.c:1313 and then printed the closing banner via fsck_progress(...), which dereferences fs (fsck_data(fs) etc.). Print the banner before the cleanup, matching the order the_end() and the rebuild paths already use. No behavior change otherwise -- the same bytes are emitted, only before the free. Re-validated after the fix: - clang+ASan/UBSan with halt_on_error: rollback save/restore, garbage-magic rejection, resize 64->128 MiB, mkfs, check, tune, debugreiserfs -- zero sanitizer errors; restore still prints "blocks restored" and the final banner. - host functional battery (gcc, --enable-warnings): 12/12. - host clang out-of-tree build: 0 warnings; clang rollback path exercised without sanitizers: exit semantics unchanged. - Debian VM, CC=clang battery on this exact tree: 12/12, 0 warnings. tests/vm/RESULTS.md documents the finding (item 6 in the clang section).
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@@ -145,15 +145,28 @@ Ferramentaria: Fedora 44 (host) com **clang 22.1.8**, Debian 12 na VM com
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5. **heap-use-after-free real, encontrado por ASan com clang**:
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`reiserfs_close()` chamava `fsync(fs->fs_dev)` DEPOIS de
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`reiserfs_free()`, que libera o `fs` — leitura pendente de 4 bytes em
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`reiserfs_free()` liberar `fs` — leitura pendente de 4 bytes em
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memória libertada (o ASan apontou exatamente `reiserfslib.c:406/407`; o
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gcc nunca acusou porque o heap ainda "devolve" o valor velho). Corrigido
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movendo o `fsync` para antes do free — a escrita já está no dispositivo
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neste ponto (`reiserfs_flush()` despeja journal e buffers; os
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`free_buffers()` de `reiserfs_free()` apenas validam e libertam, sem
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escrever). Revalidado com ASan+UBSan em `halt_on_error`: mkfs, check,
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tune, debugreiserfs, resize 64→128 MiB e rollback completo — **zero
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erros**; bateria completa no host gcc continua 12/12.
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escrever).
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6. **segundo heap-use-after-free, também no caminho de rollback**
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(`fsck/main.c:1313`, `fsck_rollback()`): a função fazia `freemem(fs)` e
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depois imprimia o banner final via `fsck_progress(...)`, que
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desreferencia `fs` (`fsck_data(fs)` etc.). Capturado por ASan em uma
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reexecução explícita do `--rollback-fsck-changes` com `halt_on_error`
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(a rodada inicial de smoke não exercitou esse ramo até o fim).
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Corrigido: o banner é impresso antes da limpeza, na mesma ordem usada
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por `the_end()` e pelos caminhos de rebuild. Revalidado: save, restore,
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rejeição de magic inválida e resize sob ASan+UBSan com `halt_on_error=1`
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— **zero erros**, saída funcional inalterada.
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Ambos os builds saneados (mkfs, check, tune, debugreiserfs, resize
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64→128 MiB e rollback completo) passam com **zero erros**; a bateria
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completa no host gcc continua 12/12.
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### Não-bugs registrados
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