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

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Message-Id: <20210313084505.16132-2-alex@ghiti.fr>
Date:   Sat, 13 Mar 2021 03:45:04 -0500
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nylon Chen <nylon7@...estech.com>,
        Nick Hu <nickhu@...estech.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com
Cc:     Alexandre Ghiti <alex@...ti.fr>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH v3 1/2] riscv: Ensure page table writes are flushed when initializing KASAN vmalloc

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@...ti.fr>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.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