This is a note to let you know that I've just added the patch titled
riscv: add icache flush for nommu sigreturn trampoline
to the 6.2-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-add-icache-flush-for-nommu-sigreturn-trampoline.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8d736482749f6d350892ef83a7a11d43cd49981e Mon Sep 17 00:00:00 2001
From: Mathis Salmen <mathis.salmen@xxxxxxxxx>
Date: Thu, 6 Apr 2023 12:11:31 +0200
Subject: riscv: add icache flush for nommu sigreturn trampoline
From: Mathis Salmen <mathis.salmen@xxxxxxxxx>
commit 8d736482749f6d350892ef83a7a11d43cd49981e upstream.
In a NOMMU kernel, sigreturn trampolines are generated on the user
stack by setup_rt_frame. Currently, these trampolines are not instruction
fenced, thus their visibility to ifetch is not guaranteed.
This patch adds a flush_icache_range in setup_rt_frame to fix this
problem.
Signed-off-by: Mathis Salmen <mathis.salmen@xxxxxxxxx>
Fixes: 6bd33e1ece52 ("riscv: add nommu support")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230406101130.82304-1-mathis.salmen@xxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/kernel/signal.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -19,6 +19,7 @@
#include <asm/signal32.h>
#include <asm/switch_to.h>
#include <asm/csr.h>
+#include <asm/cacheflush.h>
extern u32 __user_rt_sigreturn[2];
@@ -181,6 +182,7 @@ static int setup_rt_frame(struct ksignal
{
struct rt_sigframe __user *frame;
long err = 0;
+ unsigned long __maybe_unused addr;
frame = get_sigframe(ksig, regs, sizeof(*frame));
if (!access_ok(frame, sizeof(*frame)))
@@ -209,7 +211,12 @@ static int setup_rt_frame(struct ksignal
if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
sizeof(frame->sigreturn_code)))
return -EFAULT;
- regs->ra = (unsigned long)&frame->sigreturn_code;
+
+ addr = (unsigned long)&frame->sigreturn_code;
+ /* Make sure the two instructions are pushed to icache. */
+ flush_icache_range(addr, addr + sizeof(frame->sigreturn_code));
+
+ regs->ra = addr;
#endif /* CONFIG_MMU */
/*
Patches currently in stable-queue which might be from mathis.salmen@xxxxxxxxx are
queue-6.2/riscv-add-icache-flush-for-nommu-sigreturn-trampoline.patch
