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Problem Report 1381 Details

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Report 1381 Actions

    Problem Report Number 1381
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Test Suite Deficiency (TSD)
    Problem Resolution ID TSD.X.0663
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published 1996-09-18 08:00
    Product Standard Sockets (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSU version 4.1.0
    Test Identification Sockets/accept 2
    Problem Summary TSD4U.00154 This test may fail on implementations which place different alignment restrictions on character arrays and structures
    Problem Text
    Although the SIGBUS failures are limited to the accept() and getpeername()
    tests, a similar problem also exist in the getsockname() test #1, and
    hence we are requesting the problem be addressed in all three tests.

    The tests in question assume that an array of characters is aligned so
    that it can cast a struct sockaddr_in (and a struct sockaddr_un) to the
    array of characters and dereference the structure elements that are larger
    than a character, such as the sin_addr field. The actual dereference
    occurs in the checki() and checku() functions in the test suite capi_sock.a
    library. Although this assumption might be valid on some computer systems,
    it is inherently non-portable.

    Many computer systems impose alignment restrictions on certain data types
    and failing to obey the alignment restrictions can result in either a
    run-time error or unexpected program behavior. However, using the C
    language it is possible to violate the alignment restrictions by casting
    pointers to different types. This test violates the alignment restriction
    by casting a pointer to a different type.

    A possible solution to this problem is to use malloc() for maximum
    portability instead of static allocation of array of characters.

    We verified that this pointer casting was the cause of the SIGBUS errors
    by logically changing:

    char buffer[sizeof(struct sockaddr_un)+128];
    to
    int buffer[(sizeof(struct sockaddr_un)+128)/4];

    This ensures proper alignment for accessing struct sockaddr_in in our
    implementation. We do not recommend this as a fix to the test suite,
    but provide this example for illustrative purposes.
    Test Output
    TEST CASE: accept

    TEST PURPOSE #2
    If the implementation supports a communications
    domain and a connection-oriented socket type:
    A call to int accept(int socket, struct sockaddr
    *address, size_t *address_len) when address is not a
    null pointer shall store the address of the peer for
    the accepted connection in the sockaddr structure
    pointed to by address and the length of this address
    in the object pointed to by address_len.
    TEST: AF_INET SOCK_STREAM
    PREP: Create test sockaddr_in: address = 129.146.85.212, port = 3777
    PREP: Child: wait for parent
    PREP: Create a socket
    PREP: Connect socket to address 129.146.85.212, port 3777
    PREP: Child: wait for parent to complete
    PREP: Create socket
    PREP: Bind to socket
    PREP: Call listen for socket
    PREP: Signal child parent is ready
    TEST: Call accept
    PREP: getpeername for new descriptor
    TEST: Size of returned address
    TEST: Returned address
    ERROR: TEST TERMINATED DUE TO SIGBUS SIGNAL (10)

    TEST CASE: getpeername

    TEST PURPOSE #1
    If the implementation supports a communications
    domain and a socket type:
    A call to int getpeername(int socket, struct sockaddr
    *address, size_t *address_len) shall store the peer
    address of socket in the structure pointed to by
    address, set the object pointed to by address_len to
    the size of the name in bytes, and return 0.
    TEST: AF_INET SOCK_STREAM
    PREP: Create test sockaddr_in: address = 129.146.85.57, port = 1165
    PREP: Server: create socket
    PREP: Server: bind address 129.146.85.57, port 1165 to socket
    PREP: Server: listen on socket
    PREP: Server: notify client server is ready
    PREP: Server: accept connection
    INFO: Server: accepted connection from address 129.146.85.57, port 33744
    PREP: echo_server: read and echo data
    PREP: Wait for server to be ready
    PREP: Create a socket
    PREP: Connect socket to address 129.146.85.57, port 1165
    TEST: Call getpeername
    TEST: Return value
    TEST: Size of returned address
    TEST: Returned address
    ERROR: TEST TERMINATED DUE TO SIGBUS SIGNAL (10)
    1 FAIL

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We agree this is a test suite deficiency in the test
    suite version(s) listed.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Test Suite Deficiency (TSD)
    Review Conclusion
    This is an agreed Test Suite Deficiency.

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