metag/ptrace: Preserve previous registers for short regset write
authorDave Martin <Dave.Martin@arm.com>
Mon, 27 Mar 2017 14:10:55 +0000 (15:10 +0100)
committerJiri Slaby <jslaby@suse.cz>
Fri, 7 Apr 2017 08:59:34 +0000 (10:59 +0200)
commitea347c31fb80042f6d34ccf335dabd3017d98753
treec0f907582f85ceeb59a0933c3ebfac2bd34b56e3
parentbc586353a4d9e3987e4b53d544cd76e4fdeacedb
metag/ptrace: Preserve previous registers for short regset write

commit a78ce80d2c9178351b34d78fec805140c29c193e upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
arch/metag/kernel/ptrace.c