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mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects

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Kmemleak requires that vmalloc'ed objects have a minimum reference count
of 2: one in the corresponding vm_struct object and the other owned by
the vmalloc() caller.  There are cases, however, where the original
vmalloc() returned pointer is lost and, instead, a pointer to vm_struct
is stored (see free_thread_stack()).  Kmemleak currently reports such
objects as leaks.

This patch adds support for treating any surplus references to an object
as additional references to a specified object.  It introduces the
kmemleak_vmalloc() API function which takes a vm_struct pointer and sets
its surplus reference passing to the actual vmalloc() returned pointer.
The __vmalloc_node_range() calling site has been modified accordingly.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Reported-by: "Luis R. Rodriguez" <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "Luis R. Rodriguez" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Catalin Marinas 2017-07-06 15:40:22 -07:00 • committed by Linus Torvalds
commit 94f4a1618b
4 changed files with 98 additions and 10 deletions
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7
mm/vmalloc.c
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@ -1770,12 +1770,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
*/
clear_vm_uninitialized_flag(area);
/*
* A ref_count = 2 is needed because vm_struct allocated in
* __get_vm_area_node() contains a reference to the virtual address of
* the vmalloc'ed block.
*/
kmemleak_alloc(addr, real_size, 2, gfp_mask);
kmemleak_vmalloc(area, size, gfp_mask);
return addr;