This is a note to let you know that I've just added the patch titled
riscv: kprobes: allow writing to x0
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-kprobes-allow-writing-to-x0.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8cb22bec142624d21bc85ff96b7bad10b6220e6a Mon Sep 17 00:00:00 2001
From: Nam Cao <namcaov@xxxxxxxxx>
Date: Tue, 29 Aug 2023 20:25:00 +0200
Subject: riscv: kprobes: allow writing to x0
From: Nam Cao <namcaov@xxxxxxxxx>
commit 8cb22bec142624d21bc85ff96b7bad10b6220e6a upstream.
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@xxxxxxxxxxxxxxx
Signed-off-by: Nam Cao <namcaov@xxxxxxxxx>
Reviewed-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
Acked-by: Guo Ren <guoren@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230829182500.61875-1-namcaov@xxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
--
2.43.0
Patches currently in stable-queue which might be from namcaov@xxxxxxxxx are
queue-5.15/riscv-kprobes-allow-writing-to-x0.patch
