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>
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@ -162,6 +162,15 @@ See the include/linux/kmemleak.h header for the functions prototype.
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- ``kmemleak_alloc_recursive`` - as kmemleak_alloc but checks the recursiveness
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- ``kmemleak_free_recursive`` - as kmemleak_free but checks the recursiveness
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The following functions take a physical address as the object pointer
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and only perform the corresponding action if the address has a lowmem
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mapping:
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- ``kmemleak_alloc_phys``
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- ``kmemleak_free_part_phys``
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- ``kmemleak_not_leak_phys``
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- ``kmemleak_ignore_phys``
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Dealing with false positives/negatives
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--------------------------------------
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@ -38,6 +38,11 @@ extern void kmemleak_not_leak(const void *ptr) __ref;
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extern void kmemleak_ignore(const void *ptr) __ref;
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extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
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extern void kmemleak_no_scan(const void *ptr) __ref;
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extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
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gfp_t gfp) __ref;
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extern void kmemleak_free_part_phys(phys_addr_t phys, size_t size) __ref;
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extern void kmemleak_not_leak_phys(phys_addr_t phys) __ref;
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extern void kmemleak_ignore_phys(phys_addr_t phys) __ref;
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static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
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int min_count, unsigned long flags,
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@ -106,6 +111,19 @@ static inline void kmemleak_erase(void **ptr)
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static inline void kmemleak_no_scan(const void *ptr)
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{
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}
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static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
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int min_count, gfp_t gfp)
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{
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}
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static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
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{
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}
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static inline void kmemleak_not_leak_phys(phys_addr_t phys)
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{
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}
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static inline void kmemleak_ignore_phys(phys_addr_t phys)
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{
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}
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#endif /* CONFIG_DEBUG_KMEMLEAK */
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@ -155,7 +155,7 @@ void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
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{
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unsigned long cursor, end;
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kmemleak_free_part(__va(physaddr), size);
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kmemleak_free_part_phys(physaddr, size);
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cursor = PFN_UP(physaddr);
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end = PFN_DOWN(physaddr + size);
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@ -399,7 +399,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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{
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unsigned long start, end;
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kmemleak_free_part(__va(physaddr), size);
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kmemleak_free_part_phys(physaddr, size);
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start = PFN_UP(physaddr);
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end = PFN_DOWN(physaddr + size);
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@ -420,7 +420,7 @@ void __init free_bootmem(unsigned long physaddr, unsigned long size)
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{
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unsigned long start, end;
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kmemleak_free_part(__va(physaddr), size);
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kmemleak_free_part_phys(physaddr, size);
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start = PFN_UP(physaddr);
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end = PFN_DOWN(physaddr + size);
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2
mm/cma.c
2
mm/cma.c
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@ -336,7 +336,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
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* kmemleak scans/reads tracked objects for pointers to other
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* objects but this address isn't mapped and accessible
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*/
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kmemleak_ignore(phys_to_virt(addr));
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kmemleak_ignore_phys(addr);
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base = addr;
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}
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@ -90,6 +90,8 @@
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#include <linux/cache.h>
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#include <linux/percpu.h>
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#include <linux/hardirq.h>
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#include <linux/bootmem.h>
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#include <linux/pfn.h>
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#include <linux/mmzone.h>
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#include <linux/slab.h>
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#include <linux/thread_info.h>
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@ -1121,6 +1123,51 @@ void __ref kmemleak_no_scan(const void *ptr)
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}
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EXPORT_SYMBOL(kmemleak_no_scan);
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/**
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* kmemleak_alloc_phys - similar to kmemleak_alloc but taking a physical
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* address argument
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*/
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void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
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gfp_t gfp)
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{
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if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
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kmemleak_alloc(__va(phys), size, min_count, gfp);
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}
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EXPORT_SYMBOL(kmemleak_alloc_phys);
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/**
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* kmemleak_free_part_phys - similar to kmemleak_free_part but taking a
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* physical address argument
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*/
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void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size)
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{
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if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
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kmemleak_free_part(__va(phys), size);
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}
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EXPORT_SYMBOL(kmemleak_free_part_phys);
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/**
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* kmemleak_not_leak_phys - similar to kmemleak_not_leak but taking a physical
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* address argument
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*/
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void __ref kmemleak_not_leak_phys(phys_addr_t phys)
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{
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if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
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kmemleak_not_leak(__va(phys));
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}
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EXPORT_SYMBOL(kmemleak_not_leak_phys);
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/**
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* kmemleak_ignore_phys - similar to kmemleak_ignore but taking a physical
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* address argument
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*/
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void __ref kmemleak_ignore_phys(phys_addr_t phys)
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{
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if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
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kmemleak_ignore(__va(phys));
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}
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EXPORT_SYMBOL(kmemleak_ignore_phys);
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/*
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* Update an object's checksum and return true if it was modified.
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*/
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@ -723,7 +723,7 @@ int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
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(unsigned long long)base + size - 1,
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(void *)_RET_IP_);
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kmemleak_free_part(__va(base), size);
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kmemleak_free_part_phys(base, size);
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return memblock_remove_range(&memblock.reserved, base, size);
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}
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@ -1152,7 +1152,7 @@ static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
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* The min_count is set to 0 so that memblock allocations are
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* never reported as leaks.
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*/
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kmemleak_alloc(__va(found), size, 0, 0);
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kmemleak_alloc_phys(found, size, 0, 0);
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return found;
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}
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return 0;
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@ -1399,7 +1399,7 @@ void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
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memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
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__func__, (u64)base, (u64)base + size - 1,
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(void *)_RET_IP_);
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kmemleak_free_part(__va(base), size);
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kmemleak_free_part_phys(base, size);
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memblock_remove_range(&memblock.reserved, base, size);
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}
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@ -1419,7 +1419,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
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memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
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__func__, (u64)base, (u64)base + size - 1,
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(void *)_RET_IP_);
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kmemleak_free_part(__va(base), size);
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kmemleak_free_part_phys(base, size);
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cursor = PFN_UP(base);
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end = PFN_DOWN(base + size);
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@ -84,7 +84,7 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size)
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{
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unsigned long cursor, end;
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kmemleak_free_part(__va(addr), size);
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kmemleak_free_part_phys(addr, size);
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cursor = PFN_UP(addr);
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end = PFN_DOWN(addr + size);
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