linux-kernel - [PATCH v2 24/34] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot

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Message-Id: <a1f0413493eb7db125c3f8086f5d8635b627fd2c.1638825394.git.andreyknvl@google.com>
Date:   Mon,  6 Dec 2021 22:44:01 +0100
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Collingbourne <pcc@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v2 24/34] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged

From: Andrey Konovalov <andreyknvl@...gle.com>

HW_TAGS KASAN relies on ARM Memory Tagging Extension (MTE). With MTE,
a memory region must be mapped as MT_NORMAL_TAGGED to allow setting
memory tags via MTE-specific instructions.

This change adds proper protection bits to vmalloc() allocations.
These allocations are always backed by page_alloc pages, so the tags
will actually be getting set on the corresponding physical memory.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Co-developed-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
 arch/arm64/include/asm/vmalloc.h | 10 ++++++++++
 include/linux/vmalloc.h          |  7 +++++++
 mm/vmalloc.c                     |  2 ++
 3 files changed, 19 insertions(+)

diff --git a/arch/arm64/include/asm/vmalloc.h b/arch/arm64/include/asm/vmalloc.h
index b9185503feae..3d35adf365bf 100644
--- a/arch/arm64/include/asm/vmalloc.h
+++ b/arch/arm64/include/asm/vmalloc.h
@@ -25,4 +25,14 @@ static inline bool arch_vmap_pmd_supported(pgprot_t prot)
 
 #endif
 
+#define arch_vmalloc_pgprot_modify arch_vmalloc_pgprot_modify
+static inline pgprot_t arch_vmalloc_pgprot_modify(pgprot_t prot)
+{
+	if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) &&
+			(pgprot_val(prot) == pgprot_val(PAGE_KERNEL)))
+		prot = pgprot_tagged(prot);
+
+	return prot;
+}
+
 #endif /* _ASM_ARM64_VMALLOC_H */
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index b22369f540eb..965c4bf475f1 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -108,6 +108,13 @@ static inline int arch_vmap_pte_supported_shift(unsigned long size)
 }
 #endif
 
+#ifndef arch_vmalloc_pgprot_modify
+static inline pgprot_t arch_vmalloc_pgprot_modify(pgprot_t prot)
+{
+	return prot;
+}
+#endif
+
 /*
  *	Highlevel APIs for driver use
  */
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7be18b292679..f37d0ed99bf9 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3033,6 +3033,8 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
 		return NULL;
 	}
 
+	prot = arch_vmalloc_pgprot_modify(prot);
+
 	if (vmap_allow_huge && !(vm_flags & VM_NO_HUGE_VMAP)) {
 		unsigned long size_per_node;
 
-- 
2.25.1