The patch titled
Subject: kmemleak: clear stale pointers from task stacks
has been added to the -mm tree. Its filename is
kmemleak-clear-stale-pointers-from-task-stacks.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kmemleak-clear-stale-pointers-from-task-stacks.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kmemleak-clear-stale-pointers-from-task-stacks.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/thread_info.h | 2 +-
kernel/fork.c | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN include/linux/thread_info.h~kmemleak-clear-stale-pointers-from-task-stacks include/linux/thread_info.h
--- a/include/linux/thread_info.h~kmemleak-clear-stale-pointers-from-task-stacks
+++ a/include/linux/thread_info.h
@@ -42,7 +42,7 @@ enum {
#define THREAD_ALIGN THREAD_SIZE
#endif
-#ifdef CONFIG_DEBUG_STACK_USAGE
+#if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK)
# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
#else
# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT)
diff -puN kernel/fork.c~kmemleak-clear-stale-pointers-from-task-stacks kernel/fork.c
--- a/kernel/fork.c~kmemleak-clear-stale-pointers-from-task-stacks
+++ a/kernel/fork.c
@@ -216,6 +216,10 @@ static unsigned long *alloc_thread_stack
if (!s)
continue;
+#ifdef CONFIG_DEBUG_KMEMLEAK
+ /* Clear stale pointers from reused stack. */
+ memset(s->addr, 0, THREAD_SIZE);
+#endif
tsk->stack_vm_area = s;
return s->addr;
}
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxxxxxx are
kmemleak-clear-stale-pointers-from-task-stacks.patch
kmemleak-change-sys-kernel-debug-kmemleak-permissions-from-0444-to-0644.patch
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