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Message-Id: <21d500c89d8ba7ea0399553b4ef9cd393ecd1c00.1638308023.git.andreyknvl@google.com>
Date: Tue, 30 Nov 2021 23:06:49 +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 <aryabinin@...tuozzo.com>,
kasan-dev@...glegroups.com,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
Will Deacon <will@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
Evgenii Stepanov <eugenis@...gle.com>,
linux-kernel@...r.kernel.org,
Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 16/31] kasan, x86, arm64, s390: rename functions for modules shadow
From: Andrey Konovalov <andreyknvl@...gle.com>
Rename kasan_free_shadow to kasan_free_module_shadow and
kasan_module_alloc to kasan_alloc_module_shadow.
These functions are used to allocate/free shadow memory for kernel
modules when KASAN_VMALLOC is not enabled. The new names better
reflect their purpose.
Also reword the comment next to their declaration to improve clarity.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
arch/arm64/kernel/module.c | 2 +-
arch/s390/kernel/module.c | 2 +-
arch/x86/kernel/module.c | 2 +-
include/linux/kasan.h | 14 +++++++-------
mm/kasan/shadow.c | 4 ++--
mm/vmalloc.c | 2 +-
6 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index b5ec010c481f..f8bd5100efb5 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -58,7 +58,7 @@ void *module_alloc(unsigned long size)
PAGE_KERNEL, 0, NUMA_NO_NODE,
__builtin_return_address(0));
- if (p && (kasan_module_alloc(p, size) < 0)) {
+ if (p && (kasan_alloc_module_shadow(p, size) < 0)) {
vfree(p);
return NULL;
}
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index b01ba460b7ca..a753cebedda9 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -44,7 +44,7 @@ void *module_alloc(unsigned long size)
p = __vmalloc_node_range(size, MODULE_ALIGN, MODULES_VADDR, MODULES_END,
GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
__builtin_return_address(0));
- if (p && (kasan_module_alloc(p, size) < 0)) {
+ if (p && (kasan_alloc_module_shadow(p, size) < 0)) {
vfree(p);
return NULL;
}
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 169fb6f4cd2e..dec41d9ba337 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -77,7 +77,7 @@ void *module_alloc(unsigned long size)
MODULES_END, GFP_KERNEL,
PAGE_KERNEL, 0, NUMA_NO_NODE,
__builtin_return_address(0));
- if (p && (kasan_module_alloc(p, size) < 0)) {
+ if (p && (kasan_alloc_module_shadow(p, size) < 0)) {
vfree(p);
return NULL;
}
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 1031070be3f3..4eec58e6ef82 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -453,17 +453,17 @@ static inline void kasan_populate_early_vm_area_shadow(void *start,
!defined(CONFIG_KASAN_VMALLOC)
/*
- * These functions provide a special case to support backing module
- * allocations with real shadow memory. With KASAN vmalloc, the special
- * case is unnecessary, as the work is handled in the generic case.
+ * These functions allocate and free shadow memory for kernel modules.
+ * They are only required when KASAN_VMALLOC is not supported, as otherwise
+ * shadow memory is allocated by the generic vmalloc handlers.
*/
-int kasan_module_alloc(void *addr, size_t size);
-void kasan_free_shadow(const struct vm_struct *vm);
+int kasan_alloc_module_shadow(void *addr, size_t size);
+void kasan_free_module_shadow(const struct vm_struct *vm);
#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
-static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
-static inline void kasan_free_shadow(const struct vm_struct *vm) {}
+static inline int kasan_alloc_module_shadow(void *addr, size_t size) { return 0; }
+static inline void kasan_free_module_shadow(const struct vm_struct *vm) {}
#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 4a4929b29a23..585c2bf1073b 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -498,7 +498,7 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
#else /* CONFIG_KASAN_VMALLOC */
-int kasan_module_alloc(void *addr, size_t size)
+int kasan_alloc_module_shadow(void *addr, size_t size)
{
void *ret;
size_t scaled_size;
@@ -529,7 +529,7 @@ int kasan_module_alloc(void *addr, size_t size)
return -ENOMEM;
}
-void kasan_free_shadow(const struct vm_struct *vm)
+void kasan_free_module_shadow(const struct vm_struct *vm)
{
if (vm->flags & VM_KASAN)
vfree(kasan_mem_to_shadow(vm->addr));
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d2a00ad4e1dd..c5235e3e5857 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2524,7 +2524,7 @@ struct vm_struct *remove_vm_area(const void *addr)
va->vm = NULL;
spin_unlock(&vmap_area_lock);
- kasan_free_shadow(vm);
+ kasan_free_module_shadow(vm);
free_unmap_vmap_area(va);
return vm;
--
2.25.1
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