From: Mathis Salmen <mathis.salmen@matsal.de>
Date: Thu, 6 Apr 2023 12:11:31 +0200
Subject: [PATCH] riscv: add icache flush for nommu sigreturn trampoline
References: bsc#1012628
Patch-mainline: 6.2.12
Git-commit: 8d736482749f6d350892ef83a7a11d43cd49981e
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@matsal.de>
Fixes: 6bd33e1ece52 ("riscv: add nommu support")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230406101130.82304-1-mathis.salmen@matsal.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/riscv/kernel/signal.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index bfb2afa4..dee66c92 100644
--- 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 *ksig, sigset_t *set,
{
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 *ksig, sigset_t *set,
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 */
/*
--
2.35.3