linux-kernel - [PATCH] riscv: add do_page_fault and do_trap

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Date:   Tue, 30 Mar 2021 02:12:26 +0800
From:   Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: add do_page_fault and do_trap_break into the kprobes
 blacklist

From: Jisheng Zhang <jszhang@...nel.org>

These two functions are used to implement the kprobes feature so they
can't be kprobed.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/kernel/traps.c | 1 +
 arch/riscv/mm/fault.c     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 0879b5df11b9..1357abf79570 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -178,6 +178,7 @@ asmlinkage __visible void do_trap_break(struct pt_regs *regs)
 	else
 		die(regs, "Kernel BUG");
 }
+NOKPROBE_SYMBOL(do_trap_break);
 
 #ifdef CONFIG_GENERIC_BUG
 int is_valid_bugaddr(unsigned long pc)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 8f17519208c7..c5dbd55cbf7c 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -328,3 +328,4 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 	}
 	return;
 }
+NOKPROBE_SYMBOL(do_page_fault);
-- 
2.31.0