[PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc

From: Alexandre Ghiti <alex@ghiti.fr>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Nylon Chen <nylon7@andestech.com>, Nick Hu <nickhu@andestech.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	kasan-dev@googlegroups.com
Cc: Alexandre Ghiti <alex@ghiti.fr>,
	Palmer Dabbelt <palmerdabbelt@google.com>
Subject: [PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc
Date: Sat, 13 Mar 2021 03:45:04 -0500	[thread overview]
Message-ID: <20210313084505.16132-2-alex@ghiti.fr> (raw)
In-Reply-To: <20210313084505.16132-1-alex@ghiti.fr>

Make sure that writes to kernel page table during KASAN vmalloc
initialization are made visible by adding a sfence.vma.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
---
 arch/riscv/mm/kasan_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 1b968855d389..57bf4ae09361 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -187,6 +187,8 @@ void __init kasan_shallow_populate(void *start, void *end)
 		}
 		vaddr += PAGE_SIZE;
 	}
+
+	local_flush_tlb_all();
 }
 
 void __init kasan_init(void)
-- 
2.20.1


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
