linux-kernel - [PATCH 5.4 07/32] arm64: Do not pass tagged addresses to __is_lm

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Message-Id: <20210205140652.662436384@linuxfoundation.org>
Date:   Fri,  5 Feb 2021 15:07:22 +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, Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 5.4 07/32] arm64: Do not pass tagged addresses to __is_lm_address()

From: Catalin Marinas <catalin.marinas@....com>

commit 91cb2c8b072e00632adf463b78b44f123d46a0fa upstream.

Commit 519ea6f1c82f ("arm64: Fix kernel address detection of
__is_lm_address()") fixed the incorrect validation of addresses below
PAGE_OFFSET. However, it no longer allowed tagged addresses to be passed
to virt_addr_valid().

Fix this by explicitly resetting the pointer tag prior to invoking
__is_lm_address(). This is consistent with the __lm_to_phys() macro.

Fixes: 519ea6f1c82f ("arm64: Fix kernel address detection of __is_lm_address()")
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Cc: <stable@...r.kernel.org> # 5.4.x
Cc: Will Deacon <will@...nel.org>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Mark Rutland <mark.rutland@....com>
Link: https://lore.kernel.org/r/20210201190634.22942-2-catalin.marinas@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/include/asm/memory.h |    2 +-
 arch/arm64/mm/physaddr.c        |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -332,7 +332,7 @@ static inline void *phys_to_virt(phys_ad
 #endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */
 
 #define virt_addr_valid(addr)	({					\
-	__typeof__(addr) __addr = addr;					\
+	__typeof__(addr) __addr = __tag_reset(addr);			\
 	__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));	\
 })
 
--- a/arch/arm64/mm/physaddr.c
+++ b/arch/arm64/mm/physaddr.c
@@ -9,7 +9,7 @@
 
 phys_addr_t __virt_to_phys(unsigned long x)
 {
-	WARN(!__is_lm_address(x),
+	WARN(!__is_lm_address(__tag_reset(x)),
 	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
 	      (void *)x,
 	      (void *)x);