linux-kernel - [PATCH 5.15 140/262] riscv: Fix config KASAN && DEBUG

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Message-Id: <20220307091706.401417271@linuxfoundation.org>
Date:   Mon,  7 Mar 2022 10:18:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexandre Ghiti <alexandre.ghiti@...onical.com>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: [PATCH 5.15 140/262] riscv: Fix config KASAN && DEBUG_VIRTUAL

From: Alexandre Ghiti <alexandre.ghiti@...onical.com>

commit c648c4bb7d02ceb53ee40172fdc4433b37cee9c6 upstream.

__virt_to_phys function is called very early in the boot process (ie
kasan_early_init) so it should not be instrumented by KASAN otherwise it
bugs.

Fix this by declaring phys_addr.c as non-kasan instrumentable.

Signed-off-by: Alexandre Ghiti <alexandre.ghiti@...onical.com>
Fixes: 8ad8b72721d0 (riscv: Add KASAN support)
Cc: stable@...r.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/riscv/mm/Makefile |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/riscv/mm/Makefile
+++ b/arch/riscv/mm/Makefile
@@ -24,6 +24,9 @@ obj-$(CONFIG_KASAN)   += kasan_init.o
 ifdef CONFIG_KASAN
 KASAN_SANITIZE_kasan_init.o := n
 KASAN_SANITIZE_init.o := n
+ifdef CONFIG_DEBUG_VIRTUAL
+KASAN_SANITIZE_physaddr.o := n
+endif
 endif
 
 obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o