Commits
Richard Weinberger committed 4fdaa3d4798
um: Implement probe_kernel_read() commit f75b1b1bedfb498cc43a992ce4d7ed8df3b1e770 upstream. 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. Signed-off-by: Richard Weinberger <richard@nod.at> Cc: <stian@nixia.no> Cc: <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>