mm: kfence: apply kmemleak_ignore_phys on early allocated pool
This patch solves two issues.
(1) The pool allocated by memblock needs to unregister from
kmemleak scanning. Apply kmemleak_ignore_phys to replace the
original kmemleak_free as its address now is stored in the phys tree.
(2) The pool late allocated by page-alloc doesn't need to unregister.
Move out the freeing operation from its call path.
Link: https://lkml.kernel.org/r/20220628113714.7792-2-yee.lee@mediatek.com
Fixes: 0c24e06119
("mm: kmemleak: add rbtree and store physical address for objects allocated with PA")
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Suggested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
parent
14c99d6594
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@ -603,14 +603,6 @@ static unsigned long kfence_init_pool(void)
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addr += 2 * PAGE_SIZE;
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addr += 2 * PAGE_SIZE;
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}
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}
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/*
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* The pool is live and will never be deallocated from this point on.
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* Remove the pool object from the kmemleak object tree, as it would
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* otherwise overlap with allocations returned by kfence_alloc(), which
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* are registered with kmemleak through the slab post-alloc hook.
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*/
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kmemleak_free(__kfence_pool);
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return 0;
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return 0;
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}
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}
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@ -623,8 +615,16 @@ static bool __init kfence_init_pool_early(void)
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addr = kfence_init_pool();
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addr = kfence_init_pool();
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if (!addr)
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if (!addr) {
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/*
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* The pool is live and will never be deallocated from this point on.
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* Ignore the pool object from the kmemleak phys object tree, as it would
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* otherwise overlap with allocations returned by kfence_alloc(), which
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* are registered with kmemleak through the slab post-alloc hook.
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*/
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kmemleak_ignore_phys(__pa(__kfence_pool));
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return true;
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return true;
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}
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/*
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/*
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* Only release unprotected pages, and do not try to go back and change
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* Only release unprotected pages, and do not try to go back and change
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