linux-kernel - [PATCH] LoongArch: Change the signal return for user-mode ADE exceptions

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Message-Id: <20251125095758.1345956-1-duanchenghao@kylinos.cn>
Date: Tue, 25 Nov 2025 17:57:58 +0800
From: Chenghao Duan <duanchenghao@...inos.cn>
To: chenhuacai@...nel.org,
	kernel@...0n.name
Cc: yangtiezhu@...ngson.cn,
	zhangtianyang@...ngson.cn,
	masahiroy@...nel.org,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	duanchenghao@...inos.cn
Subject: [PATCH] LoongArch: Change the signal return for user-mode ADE exceptions

When a user-mode process accesses an invalid address, the SIGSEGV signal
is returned.
For example, when user-space accesses a kernel-space virtual address.

Signed-off-by: Chenghao Duan <duanchenghao@...inos.cn>
---
 arch/loongarch/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c
index da5926fead4a..508d3126cdb2 100644
--- a/arch/loongarch/kernel/traps.c
+++ b/arch/loongarch/kernel/traps.c
@@ -537,7 +537,7 @@ asmlinkage void noinstr do_ade(struct pt_regs *regs)
 	irqentry_state_t state = irqentry_enter(regs);
 
 	die_if_kernel("Kernel ade access", regs);
-	force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)regs->csr_badvaddr);
+	force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)regs->csr_badvaddr);
 
 	irqentry_exit(regs, state);
 }
-- 
2.25.1