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authorCatalin Marinas <catalin.marinas@arm.com>2016-10-11 13:55:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-11 15:06:33 -0700
commit9099daed9c6991a512c1f74b92ec49daf9408cda (patch)
tree9ebac94f168a0d5d843b715c1d19708d12a1c8c0
parent0549a3c02efb350776bc869685a361045efd3a29 (diff)
mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping
Some of the kmemleak_*() callbacks in memblock, bootmem, CMA convert a physical address to a virtual one using __va(). However, such physical addresses may sometimes be located in highmem and using __va() is incorrect, leading to inconsistent object tracking in kmemleak. The following functions have been added to the kmemleak API and they take a physical address as the object pointer. They only perform the corresponding action if the address has a lowmem mapping: kmemleak_alloc_phys kmemleak_free_part_phys kmemleak_not_leak_phys kmemleak_ignore_phys The affected calling places have been updated to use the new kmemleak API. Link: http://lkml.kernel.org/r/1471531432-16503-1-git-send-email-catalin.marinas@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/dev-tools/kmemleak.rst9
-rw-r--r--include/linux/kmemleak.h18
-rw-r--r--mm/bootmem.c6
-rw-r--r--mm/cma.c2
-rw-r--r--mm/kmemleak.c47
-rw-r--r--mm/memblock.c8
-rw-r--r--mm/nobootmem.c2
7 files changed, 83 insertions, 9 deletions
diff --git a/Documentation/dev-tools/kmemleak.rst b/Documentation/dev-tools/kmemleak.rst
index 1788722d5495..b2391b829169 100644
--- a/Documentation/dev-tools/kmemleak.rst
+++ b/Documentation/dev-tools/kmemleak.rst
@@ -162,6 +162,15 @@ See the include/linux/kmemleak.h header for the functions prototype.
- ``kmemleak_alloc_recursive`` - as kmemleak_alloc but checks the recursiveness
- ``kmemleak_free_recursive`` - as kmemleak_free but checks the recursiveness
+The following functions take a physical address as the object pointer
+and only perform the corresponding action if the address has a lowmem
+mapping:
+
+- ``kmemleak_alloc_phys``
+- ``kmemleak_free_part_phys``
+- ``kmemleak_not_leak_phys``
+- ``kmemleak_ignore_phys``
+
Dealing with false positives/negatives
--------------------------------------
diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
index 4894c6888bc6..1c2a32829620 100644
--- a/include/linux/kmemleak.h
+++ b/include/linux/kmemleak.h
@@ -38,6 +38,11 @@ extern void kmemleak_not_leak(const void *ptr) __ref;
extern void kmemleak_ignore(const void *ptr) __ref;
extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
extern void kmemleak_no_scan(const void *ptr) __ref;
+extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
+ gfp_t gfp) __ref;
+extern void kmemleak_free_part_phys(phys_addr_t phys, size_t size) __ref;
+extern void kmemleak_not_leak_phys(phys_addr_t phys) __ref;
+extern void kmemleak_ignore_phys(phys_addr_t phys) __ref;
static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
int min_count, unsigned long flags,
@@ -106,6 +111,19 @@ static inline void kmemleak_erase(void **ptr)
static inline void kmemleak_no_scan(const void *ptr)
{
}
+static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
+ int min_count, gfp_t gfp)
+{
+}
+static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
+{
+}
+static inline void kmemleak_not_leak_phys(phys_addr_t phys)
+{
+}
+static inline void kmemleak_ignore_phys(phys_addr_t phys)
+{
+}
#endif /* CONFIG_DEBUG_KMEMLEAK */
diff --git a/mm/bootmem.c b/mm/bootmem.c
index a869f84f44d3..e8a55a3c9feb 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -155,7 +155,7 @@ void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
{
unsigned long cursor, end;
- kmemleak_free_part(__va(physaddr), size);
+ kmemleak_free_part_phys(physaddr, size);
cursor = PFN_UP(physaddr);
end = PFN_DOWN(physaddr + size);
@@ -399,7 +399,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
{
unsigned long start, end;
- kmemleak_free_part(__va(physaddr), size);
+ kmemleak_free_part_phys(physaddr, size);
start = PFN_UP(physaddr);
end = PFN_DOWN(physaddr + size);
@@ -420,7 +420,7 @@ void __init free_bootmem(unsigned long physaddr, unsigned long size)
{
unsigned long start, end;
- kmemleak_free_part(__va(physaddr), size);
+ kmemleak_free_part_phys(physaddr, size);
start = PFN_UP(physaddr);
end = PFN_DOWN(physaddr + size);
diff --git a/mm/cma.c b/mm/cma.c
index bd0e1412475e..384c2cb51b56 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -336,7 +336,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
* kmemleak scans/reads tracked objects for pointers to other
* objects but this address isn't mapped and accessible
*/
- kmemleak_ignore(phys_to_virt(addr));
+ kmemleak_ignore_phys(addr);
base = addr;
}
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 086292f7c59d..a5e453cf05c4 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -90,6 +90,8 @@
#include <linux/cache.h>
#include <linux/percpu.h>
#include <linux/hardirq.h>
+#include <linux/bootmem.h>
+#include <linux/pfn.h>
#include <linux/mmzone.h>
#include <linux/slab.h>
#include <linux/thread_info.h>
@@ -1121,6 +1123,51 @@ void __ref kmemleak_no_scan(const void *ptr)
}
EXPORT_SYMBOL(kmemleak_no_scan);
+/**
+ * kmemleak_alloc_phys - similar to kmemleak_alloc but taking a physical
+ * address argument
+ */
+void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
+ gfp_t gfp)
+{
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+ kmemleak_alloc(__va(phys), size, min_count, gfp);
+}
+EXPORT_SYMBOL(kmemleak_alloc_phys);
+
+/**
+ * kmemleak_free_part_phys - similar to kmemleak_free_part but taking a
+ * physical address argument
+ */
+void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size)
+{
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+ kmemleak_free_part(__va(phys), size);
+}
+EXPORT_SYMBOL(kmemleak_free_part_phys);
+
+/**
+ * kmemleak_not_leak_phys - similar to kmemleak_not_leak but taking a physical
+ * address argument
+ */
+void __ref kmemleak_not_leak_phys(phys_addr_t phys)
+{
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+ kmemleak_not_leak(__va(phys));
+}
+EXPORT_SYMBOL(kmemleak_not_leak_phys);
+
+/**
+ * kmemleak_ignore_phys - similar to kmemleak_ignore but taking a physical
+ * address argument
+ */
+void __ref kmemleak_ignore_phys(phys_addr_t phys)
+{
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+ kmemleak_ignore(__va(phys));
+}
+EXPORT_SYMBOL(kmemleak_ignore_phys);
+
/*
* Update an object's checksum and return true if it was modified.
*/
diff --git a/mm/memblock.c b/mm/memblock.c
index c8dfa430342b..7608bc305936 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -723,7 +723,7 @@ int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
(unsigned long long)base + size - 1,
(void *)_RET_IP_);
- kmemleak_free_part(__va(base), size);
+ kmemleak_free_part_phys(base, size);
return memblock_remove_range(&memblock.reserved, base, size);
}
@@ -1152,7 +1152,7 @@ static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
* The min_count is set to 0 so that memblock allocations are
* never reported as leaks.
*/
- kmemleak_alloc(__va(found), size, 0, 0);
+ kmemleak_alloc_phys(found, size, 0, 0);
return found;
}
return 0;
@@ -1399,7 +1399,7 @@ void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
__func__, (u64)base, (u64)base + size - 1,
(void *)_RET_IP_);
- kmemleak_free_part(__va(base), size);
+ kmemleak_free_part_phys(base, size);
memblock_remove_range(&memblock.reserved, base, size);
}
@@ -1419,7 +1419,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
__func__, (u64)base, (u64)base + size - 1,
(void *)_RET_IP_);
- kmemleak_free_part(__va(base), size);
+ kmemleak_free_part_phys(base, size);
cursor = PFN_UP(base);
end = PFN_DOWN(base + size);
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index ba609b684d7a..487dad610731 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -84,7 +84,7 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size)
{
unsigned long cursor, end;
- kmemleak_free_part(__va(addr), size);
+ kmemleak_free_part_phys(addr, size);
cursor = PFN_UP(addr);
end = PFN_DOWN(addr + size);