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From: Nam Cao <namcaov@gmail.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: guoren@kernel.org, Nam Cao <namcaov@gmail.com>, stable@vger.kernel.org
Subject: [PATCH] riscv: kprobes: allow writing to x0
Date: Tue, 29 Aug 2023 20:25:00 +0200	[thread overview]
Message-ID: <20230829182500.61875-1-namcaov@gmail.com> (raw)

Instructions can write to x0, so we should simulate these instructions
normally.

Currently, the kernel hangs if an instruction who writes to x0 is
simulated.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Nam Cao <namcaov@gmail.com>
---
 arch/riscv/kernel/probes/simulate-insn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/probes/simulate-insn.c b/arch/riscv/kernel/probes/simulate-insn.c
index d3099d67816d..6c166029079c 100644
--- a/arch/riscv/kernel/probes/simulate-insn.c
+++ b/arch/riscv/kernel/probes/simulate-insn.c
@@ -24,7 +24,7 @@ static inline bool rv_insn_reg_set_val(struct pt_regs *regs, u32 index,
 				       unsigned long val)
 {
 	if (index == 0)
-		return false;
+		return true;
 	else if (index <= 31)
 		*((unsigned long *)regs + index) = val;
 	else
-- 
2.34.1


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WARNING: multiple messages have this Message-ID (diff)
From: Nam Cao <namcaov@gmail.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: guoren@kernel.org, Nam Cao <namcaov@gmail.com>, stable@vger.kernel.org
Subject: [PATCH] riscv: kprobes: allow writing to x0
Date: Tue, 29 Aug 2023 20:25:00 +0200	[thread overview]
Message-ID: <20230829182500.61875-1-namcaov@gmail.com> (raw)

Instructions can write to x0, so we should simulate these instructions
normally.

Currently, the kernel hangs if an instruction who writes to x0 is
simulated.

Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
Cc: stable@vger.kernel.org
Signed-off-by: Nam Cao <namcaov@gmail.com>
---
 arch/riscv/kernel/probes/simulate-insn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/probes/simulate-insn.c b/arch/riscv/kernel/probes/simulate-insn.c
index d3099d67816d..6c166029079c 100644
--- a/arch/riscv/kernel/probes/simulate-insn.c
+++ b/arch/riscv/kernel/probes/simulate-insn.c
@@ -24,7 +24,7 @@ static inline bool rv_insn_reg_set_val(struct pt_regs *regs, u32 index,
 				       unsigned long val)
 {
 	if (index == 0)
-		return false;
+		return true;
 	else if (index <= 31)
 		*((unsigned long *)regs + index) = val;
 	else
-- 
2.34.1


             reply	other threads:[~2023-08-29 18:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-29 18:25 Nam Cao [this message]
2023-08-29 18:25 ` [PATCH] riscv: kprobes: allow writing to x0 Nam Cao
2023-08-29 19:04 ` Charlie Jenkins
2023-08-29 19:04   ` Charlie Jenkins
2023-08-30  1:37 ` Guo Ren
2023-08-30  1:37   ` Guo Ren
2023-11-06 15:00 ` patchwork-bot+linux-riscv
2023-11-06 15:00   ` patchwork-bot+linux-riscv

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