The patch titled
Subject: mm: kmemleak: check physical address when scan
has been added to the -mm mm-unstable branch. Its filename is
mm-kmemleak-check-physical-address-when-scan.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kmemleak-check-physical-address-when-scan.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Patrick Wang <patrick.wang.shcn@xxxxxxxxx>
Subject: mm: kmemleak: check physical address when scan
Date: Thu, 9 Jun 2022 20:49:50 +0800
Check the physical address of objects for its boundary when scan instead
of in kmemleak_*_phys().
Link: https://lkml.kernel.org/r/20220609124950.1694394-4-patrick.wang.shcn@xxxxxxxxx
Fixes: 23c2d497de21 ("mm: kmemleak: take a full lowmem check in kmemleak_*_phys()")
Signed-off-by: Patrick Wang <patrick.wang.shcn@xxxxxxxxx>
Suggested-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Yee Lee <yee.lee@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmemleak.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
--- a/mm/kmemleak.c~mm-kmemleak-check-physical-address-when-scan
+++ a/mm/kmemleak.c
@@ -1184,7 +1184,7 @@ void __ref kmemleak_alloc_phys(phys_addr
{
pr_debug("%s(0x%pa, %zu)\n", __func__, &phys, size);
- if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
+ if (kmemleak_enabled)
/*
* Create object with OBJECT_PHYS flag and
* assume min_count 0.
@@ -1204,7 +1204,7 @@ void __ref kmemleak_free_part_phys(phys_
{
pr_debug("%s(0x%pa)\n", __func__, &phys);
- if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
+ if (kmemleak_enabled)
delete_object_part((unsigned long)phys, size, true);
}
EXPORT_SYMBOL(kmemleak_free_part_phys);
@@ -1218,7 +1218,7 @@ void __ref kmemleak_ignore_phys(phys_add
{
pr_debug("%s(0x%pa)\n", __func__, &phys);
- if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
+ if (kmemleak_enabled)
make_black_object((unsigned long)phys, true);
}
EXPORT_SYMBOL(kmemleak_ignore_phys);
@@ -1493,6 +1493,17 @@ static void kmemleak_scan(void)
dump_object_info(object);
}
#endif
+
+ /* ignore objects outside lowmem (paint them black) */
+ if ((object->flags & OBJECT_PHYS) &&
+ !(object->flags & OBJECT_NO_SCAN)) {
+ unsigned long phys = object->pointer;
+
+ if (PHYS_PFN(phys) < min_low_pfn ||
+ PHYS_PFN(phys + object->size) >= max_low_pfn)
+ __paint_it(object, KMEMLEAK_BLACK);
+ }
+
/* reset the reference count (whiten the object) */
object->count = 0;
if (color_gray(object) && get_object(object))
_
Patches currently in -mm which might be from patrick.wang.shcn@xxxxxxxxx are
mm-kmemleak-add-object_phys-flag-for-objects-allocated-with-physical-address.patch
mm-kmemleak-add-rbtree-and-store-physical-address-for-objects-allocated-with-pa.patch
mm-kmemleak-check-physical-address-when-scan.patch
