From: Catalin Marinas <catalin.marinas@arm.com>
To: George Prekas <george@enfabrica.net>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Vlastimil Babka <vbabka@suse.cz>,
Roman Gushchin <roman.gushchin@linux.dev>,
Hyeonggon Yoo <42.hyeyoo@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Andrei Vagin <avagin@gmail.com>
Subject: Re: [PATCH 1/9] mm: kmemleak: properly disable task stack scanning
Date: Wed, 25 Jan 2023 14:47:21 +0000 [thread overview]
Message-ID: <Y9FA+fFBytksYZi9@arm.com> (raw)
In-Reply-To: <20230123170419.7292-2-george@enfabrica.net>
On Mon, Jan 23, 2023 at 11:04:11AM -0600, George Prekas wrote:
> @@ -1586,23 +1608,6 @@ static void kmemleak_scan(void)
> }
> put_online_mems();
>
> - /*
> - * Scanning the task stacks (may introduce false negatives).
> - */
> - if (kmemleak_stack_scan) {
> - struct task_struct *p, *g;
> -
> - rcu_read_lock();
> - for_each_process_thread(g, p) {
> - void *stack = try_get_task_stack(p);
> - if (stack) {
> - scan_block(stack, stack + THREAD_SIZE, NULL);
> - put_task_stack(p);
> - }
> - }
> - rcu_read_unlock();
> - }
On architectures without VMAP_STACK, we still need the above otherwise
it could lead to some false positives.
--
Catalin
next prev parent reply other threads:[~2023-01-25 14:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-23 17:04 [PATCH 0/9] mm: kmemleak: fix unreported memory leaks George Prekas
2023-01-23 17:04 ` [PATCH 1/9] mm: kmemleak: properly disable task stack scanning George Prekas
2023-01-24 0:39 ` kernel test robot
2023-01-24 5:46 ` kernel test robot
2023-01-24 5:57 ` kernel test robot
2023-01-24 6:07 ` kernel test robot
2023-01-25 14:47 ` Catalin Marinas [this message]
2023-02-01 15:38 ` kernel test robot
2023-01-23 17:04 ` [PATCH 2/9] Revert "mm/kmemleak: make create_object return void" George Prekas
2023-01-23 17:04 ` [PATCH 3/9] mm: kmemleak: propagate NO_SCAN flag in delete_object_part George Prekas
2023-01-23 17:04 ` [PATCH 4/9] mm: kmemleak: add kmemleak_noscan_phys function George Prekas
2023-01-23 17:04 ` [PATCH 5/9] mm: kmemleak: do not scan sparsemap_buf George Prekas
2023-01-23 17:04 ` [PATCH 6/9] mm: kmemleak: do not scan cpu_cache of struct kmem_cache George Prekas
2023-01-23 17:04 ` [PATCH 7/9] mm: kmemleak: erase page->s_mem in slab_destroy George Prekas
2023-01-26 11:28 ` Christoph Lameter
2023-01-23 17:04 ` [PATCH 8/9] mm: kmemleak: erase page->freelist " George Prekas
2023-01-23 17:04 ` [PATCH 9/9] mm: kmemleak: fix undetected leaks for page aligned objects George Prekas
2023-01-24 16:16 ` Matthew Wilcox
2023-01-26 11:21 ` Christoph Lameter
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