linux-kernel - [PATCH 5/5] MIPS: Disallow outsized PTRACE_SETREGSET NT

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Message-ID: <alpine.DEB.2.00.1711291450420.31156@tp.orcam.me.uk>
Date:   Wed, 29 Nov 2017 15:22:01 +0000
From:   "Maciej W. Rozycki" <macro@...s.com>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...s.com>
CC:     Paul Burton <Paul.Burton@...s.com>,
        Alex Smith <alex@...x-smith.me.uk>,
        Dave Martin <Dave.Martin@....com>, <linux-mips@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: [PATCH 5/5] MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG
 regset accesses

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.

Cc: stable@...r.kernel.org # v3.17+
Fixes: c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout")
Signed-off-by: Maciej W. Rozycki <macro@...s.com>
---
 arch/mips/kernel/ptrace.c |    3 +++
 1 file changed, 3 insertions(+)

linux-mips-nt-prfpreg-size.diff
Index: linux-sfr-test/arch/mips/kernel/ptrace.c
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/ptrace.c	2017-11-28 23:52:40.373594000 +0000
+++ linux-sfr-test/arch/mips/kernel/ptrace.c	2017-11-28 23:52:47.058649000 +0000
@@ -533,6 +533,9 @@ static int fpr_set(struct task_struct *t
 	u32 fcr31;
 	int err;
 
+	if (pos + count > sizeof(elf_fpregset_t))
+		return -EIO;
+
 	init_fp_ctx(target);
 
 	if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))