From c8c5a3a24d395b14447a9a89d61586a913840a3b Mon Sep 17 00:00:00 2001 From: Maciej W. Rozycki Date: Mon, 11 Dec 2017 22:56:54 +0000 Subject: 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. Signed-off-by: Maciej W. Rozycki Fixes: c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout") Cc: James Hogan Cc: Paul Burton Cc: Alex Smith Cc: Dave Martin Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # v3.17+ Patchwork: https://patchwork.linux-mips.org/patch/17930/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/ptrace.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/mips/kernel/ptrace.c') diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 256908951a7c..0b23b1ad99e6 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -550,6 +550,9 @@ static int fpr_set(struct task_struct *target, BUG_ON(count % sizeof(elf_fpreg_t)); + if (pos + count > sizeof(elf_fpregset_t)) + return -EIO; + init_fp_ctx(target); if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t)) -- cgit v1.2.3-55-g7522