• Richard Weinberger's avatar
    um: Implement probe_kernel_read() · f75b1b1b
    Richard Weinberger authored
    UML needs it's own probe_kernel_read() to handle kernel
    mode faults correctly.
    The implementation uses mincore() on the host side to detect
    whether a page is owned by the UML kernel process.
    
    This fixes also a possible crash when sysrq-t is used.
    Starting with 3.10 sysrq-t calls probe_kernel_read() to
    read details from the kernel workers. As kernel worker are
    completely async pointers may turn NULL while reading them.
    
    Cc: <stian@nixia.no>
    Cc: <tj@kernel.org>
    Cc: <stable@vger.kernel.org> # 3.10.x
    Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
    f75b1b1b
maccess.c 638 Bytes