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    Subject[PATCH 4.14 013/118] MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Maciej W. Rozycki <macro@mips.com>

    commit c8c5a3a24d395b14447a9a89d61586a913840a3b upstream.

    Complement commit c23b3d1a5311 ("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: c23b3d1a5311 ("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>

    ---
    arch/mips/kernel/ptrace.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/arch/mips/kernel/ptrace.c
    +++ b/arch/mips/kernel/ptrace.c
    @@ -541,6 +541,9 @@ static int fpr_set(struct task_struct *t

    BUG_ON(count % sizeof(elf_fpreg_t));

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

    if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))

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