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ANDROID: mm: add get_each_object_track function

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Add and export get_each_object_track which helps in
looping through all the slab objects of a page
and gets the track structure of each object, also
make track_item and track structure public, these
will be used by the minidump module to get slab
owner info. Includes commit 0e00d7c46b36 ("ANDROID:
mm/slub: Fix Kasan issue with for_each_object_track")
from android13-5.15 as a bug fix.

Bug: 199236943
Change-Id: Id9922b57053be277f8042ad8199fbbf9faa984ef
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
Signed-off-by: Jaskaran Singh <quic_jasksing@quicinc.com>
This commit is contained in:
Vijayanand Jitta 2021-09-17 08:40:41 +05:30 committed by Chris Goldsworthy
parent 173c09996a
commit 97b7d85866
2 changed files with 67 additions and 16 deletions
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31
mm/slab.h
View File

@ -282,6 +282,24 @@ void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller);
gfp_t kmalloc_fix_flags(gfp_t flags);
#ifdef CONFIG_SLUB
/*
* Tracking user of a slab.
*/
#define TRACK_ADDRS_COUNT 16
struct track {
unsigned long addr; /* Called from address */
#ifdef CONFIG_STACKDEPOT
depot_stack_handle_t handle;
#endif
int cpu; /* Was running on cpu */
int pid; /* Pid context */
unsigned long when; /* When did the operation occur */
};
enum track_item { TRACK_ALLOC, TRACK_FREE };
#endif
/* Functions provided by the slab allocators */
int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
@ -399,6 +417,10 @@ DECLARE_STATIC_KEY_FALSE(slub_debug_enabled);
#endif
extern void print_tracking(struct kmem_cache *s, void *object);
long validate_slab_cache(struct kmem_cache *s);
extern unsigned long get_each_object_track(struct kmem_cache *s,
struct page *page, enum track_item alloc,
int (*fn)(const struct kmem_cache *, const void *,
const struct track *, void *), void *private);
static inline bool __slub_debug_enabled(void)
{
return static_branch_unlikely(&slub_debug_enabled);
@ -407,6 +429,15 @@ static inline bool __slub_debug_enabled(void)
static inline void print_tracking(struct kmem_cache *s, void *object)
{
}
#ifdef CONFIG_SLUB
static inline unsigned long get_each_object_track(struct kmem_cache *s,
struct page *page, enum track_item alloc,
int (*fn)(const struct kmem_cache *, const void *,
const struct track *, void *), void *private)
{
return 0;
}
#endif
static inline bool __slub_debug_enabled(void)
{
return false;

52
mm/slub.c
View File

@ -282,22 +282,6 @@ static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s)
/* Use cmpxchg_double */
#define __CMPXCHG_DOUBLE ((slab_flags_t __force)0x40000000U)
/*
* Tracking user of a slab.
*/
#define TRACK_ADDRS_COUNT 16
struct track {
unsigned long addr; /* Called from address */
#ifdef CONFIG_STACKDEPOT
depot_stack_handle_t handle;
#endif
int cpu; /* Was running on cpu */
int pid; /* Pid context */
unsigned long when; /* When did the operation occur */
};
enum track_item { TRACK_ALLOC, TRACK_FREE };
#ifdef CONFIG_SYSFS
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
@ -725,6 +709,42 @@ static struct track *get_track(struct kmem_cache *s, void *object,
return kasan_reset_tag(p + alloc);
}
/*
* This function will be used to loop through all the slab objects in
* a page to give track structure for each object, the function fn will
* be using this track structure and extract required info into its private
* data, the return value will be the number of track structures that are
* processed.
*/
unsigned long get_each_object_track(struct kmem_cache *s,
struct page *page, enum track_item alloc,
int (*fn)(const struct kmem_cache *, const void *,
const struct track *, void *), void *private)
{
void *p;
struct track *t;
int ret;
unsigned long num_track = 0;
struct slab *p_slab = page_slab(page);
if (!slub_debug || !(s->flags & SLAB_STORE_USER) || !p_slab)
return 0;
slab_lock(p_slab);
for_each_object(p, s, page_address(page), p_slab->objects) {
t = get_track(s, p, alloc);
metadata_access_enable();
ret = fn(s, p, t, private);
metadata_access_disable();
if (ret < 0)
break;
num_track += 1;
}
slab_unlock(p_slab);
return num_track;
}
EXPORT_SYMBOL_NS_GPL(get_each_object_track, MINIDUMP);
#ifdef CONFIG_STACKDEPOT
static noinline depot_stack_handle_t set_track_prepare(void)
{