linux-kernel - [PATCH] riscv: mm: abort uaccess retries upon fatal signal

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Date:   Wed, 30 Dec 2020 14:39:16 +0000
From:   guoren@...nel.org
To:     palmerdabbelt@...gle.com, paul.walmsley@...ive.com,
        anup@...infault.org, atish.patra@....com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, guoren@...nel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Mark Rutland <mark.rutland@....com>,
        Pekka Enberg <penberg@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>
Subject: [PATCH] riscv: mm: abort uaccess retries upon fatal signal

From: Guo Ren <guoren@...ux.alibaba.com>

Pick up the patch from the 'Link' made by Mark Rutland. Keep the
same with x86, arm, arm64, arc, sh, power.

Link: https://lore.kernel.org/linux-arm-kernel/1499782763-31418-1-git-send-email-mark.rutland@arm.com/
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Palmer Dabbelt <palmer@...belt.com>
---
 arch/riscv/mm/fault.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 3c8b9e4..7f5f45b 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -280,8 +280,11 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 	 * signal first. We do not need to release the mmap_lock because it
 	 * would already be released in __lock_page_or_retry in mm/filemap.c.
 	 */
-	if (fault_signal_pending(fault, regs))
+	if (fault_signal_pending(fault, regs)) {
+		if (!user_mode(regs))
+			no_context(regs, addr);
 		return;
+	}
 
 	if (unlikely((fault & VM_FAULT_RETRY) && (flags & FAULT_FLAG_ALLOW_RETRY))) {
 		flags |= FAULT_FLAG_TRIED;
-- 
2.7.4