forked from Minki/linux
kmemleak: clear stale pointers from task stacks
Kmemleak considers any pointers on task stacks as references. This patch clears newly allocated and reused vmap stacks. Link: http://lkml.kernel.org/r/150728990124.744199.8403409836394318684.stgit@buzz Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -42,7 +42,7 @@ enum {
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#define THREAD_ALIGN THREAD_SIZE
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#endif
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK)
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# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
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__GFP_ZERO)
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#else
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@ -215,6 +215,10 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
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if (!s)
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continue;
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#ifdef CONFIG_DEBUG_KMEMLEAK
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/* Clear stale pointers from reused stack. */
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memset(s->addr, 0, THREAD_SIZE);
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#endif
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tsk->stack_vm_area = s;
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return s->addr;
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}
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