linux-kernel - [PATCH 4.9 12/96] MIPS: Also verify sizeof `elf_fpreg_t with PTRACE

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Message-Id: <20180115123405.571006869@linuxfoundation.org>
Date:   Mon, 15 Jan 2018 13:34:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Maciej W. Rozycki" <macro@...s.com>,
        James Hogan <james.hogan@...s.com>,
        Paul Burton <Paul.Burton@...s.com>,
        Alex Smith <alex@...x-smith.me.uk>,
        Dave Martin <Dave.Martin@....com>, linux-mips@...ux-mips.org,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 4.9 12/96] MIPS: Also verify sizeof `elf_fpreg_t with PTRACE_SETREGSET

4.9-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 006501e039eec411842bb3150c41358867d320c2 upstream.

Complement commit d614fd58a283 ("mips/ptrace: Preserve previous
registers for short regset write") and like with the PTRACE_GETREGSET
ptrace(2) request also apply a BUILD_BUG_ON check for the size of the
`elf_fpreg_t' type in the PTRACE_SETREGSET request handler.

Signed-off-by: Maciej W. Rozycki <macro@...s.com>
Fixes: d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write")
Cc: James Hogan <james.hogan@...s.com>
Cc: Paul Burton <Paul.Burton@...s.com>
Cc: Alex Smith <alex@...x-smith.me.uk>
Cc: Dave Martin <Dave.Martin@....com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17929/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -467,6 +467,7 @@ static int fpr_get_msa(struct task_struc
 	u64 fpr_val;
 	int err;

+	BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
 	for (i = 0; i < NUM_FPU_REGS; i++) {
 		fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
 		err = user_regset_copyout(pos, count, kbuf, ubuf,