From mboxrd@z Thu Jan 1 00:00:00 1970 From: sashal@kernel.org (Sasha Levin) Date: Tue, 3 Sep 2019 12:24:24 -0400 Subject: [PATCH AUTOSEL 4.19 112/167] ARC: mm: fix uninitialised signal code in do_page_fault In-Reply-To: <20190903162519.7136-1-sashal@kernel.org> References: <20190903162519.7136-1-sashal@kernel.org> List-ID: Message-ID: <20190903162519.7136-112-sashal@kernel.org> To: linux-snps-arc@lists.infradead.org From: Eugeniy Paltsev [ Upstream commit 121e38e5acdc8e1e4cdb750fcdcc72f94e420968 ] Commit 15773ae938d8 ("signal/arc: Use force_sig_fault where appropriate") introduced undefined behaviour by leaving si_code unitiailized and leaking random kernel values to user space. Fixes: 15773ae938d8 ("signal/arc: Use force_sig_fault where appropriate") Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin --- arch/arc/mm/fault.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index a0366f9dca051..535cf18e8bf2c 100644 --- a/arch/arc/mm/fault.c +++ b/arch/arc/mm/fault.c @@ -66,7 +66,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) struct vm_area_struct *vma = NULL; struct task_struct *tsk = current; struct mm_struct *mm = tsk->mm; - int si_code; + int si_code = 0; int ret; vm_fault_t fault; int write = regs->ecr_cause & ECR_C_PROTV_STORE; /* ST/EX */ -- 2.20.1