• Eric W. Biederman's avatar
    signal: Ensure generic siginfos the kernel sends have all bits initialized · faf1f22b
    Eric W. Biederman authored
    Call clear_siginfo to ensure stack allocated siginfos are fully
    initialized before being passed to the signal sending functions.
    
    This ensures that if there is the kind of confusion documented by
    TRAP_FIXME, FPE_FIXME, or BUS_FIXME the kernel won't send unitialized
    data to userspace when the kernel generates a signal with SI_USER but
    the copy to userspace assumes it is a different kind of signal, and
    different fields are initialized.
    
    This also prepares the way for turning copy_siginfo_to_user
    into a copy_to_user, by removing the need in many cases to perform
    a field by field copy simply to skip the uninitialized fields.
    Signed-off-by: 's avatar"Eric W. Biederman" <ebiederm@xmission.com>
    faf1f22b
fcntl.c 23 KB