• Eric W. Biederman's avatar
    signal: Ensure every siginfo we send has all bits initialized · 3eb0f519
    Eric W. Biederman authored
    Call clear_siginfo to ensure every stack allocated siginfo is properly
    initialized before being passed to the signal sending functions.
    Note: It is not safe to depend on C initializers to initialize struct
    siginfo on the stack because C is allowed to skip holes when
    initializing a structure.
    The initialization of struct siginfo in tracehook_report_syscall_exit
    was moved from the helper user_single_step_siginfo into
    tracehook_report_syscall_exit itself, to make it clear that the local
    variable siginfo gets fully initialized.
    In a few cases the scope of struct siginfo has been reduced to make it
    clear that siginfo siginfo is not used on other paths in the function
    in which it is declared.
    Instances of using memset to initialize siginfo have been replaced
    with calls clear_siginfo for clarity.
    Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>