Commit 1eaff733 authored Dec 11, 2017 by Maciej W. Rozycki Committed by Greg Kroah-Hartman Jan 17, 2018

MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses



commit c8c5a3a24d395b14447a9a89d61586a913840a3b upstream.

Complement commit c23b3d1a ("MIPS: ptrace: Change GP regset to use
correct core dump register layout") and also reject outsized
PTRACE_SETREGSET requests to the NT_PRFPREG regset, like with the
NT_PRSTATUS regset.

Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Fixes: c23b3d1a ("MIPS: ptrace: Change GP regset to use correct core dump register layout")
Cc: James Hogan <james.hogan@mips.com>
Cc: Paul Burton <Paul.Burton@mips.com>
Cc: Alex Smith <alex@alex-smith.me.uk>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17930/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 0cc4b3b0

arch/mips/kernel/ptrace.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -530,6 +530,9 @@ static int fpr_set(struct task_struct *target,

		BUG_ON(count % sizeof(elf_fpreg_t));

		if (pos + count > sizeof(elf_fpregset_t))
		return -EIO;

		if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
		err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf);
		else