From: Roman Gushchin <guro@fb.com>
To: Waiman Long <longman@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
<linux-kernel@vger.kernel.org>, <cgroups@vger.kernel.org>,
<linux-mm@kvack.org>, Ira Weiny <ira.weiny@intel.com>,
Mike Rapoport <rppt@kernel.org>,
David Rientjes <rientjes@google.com>,
Rafael Aquini <aquini@redhat.com>
Subject: Re: [PATCH v3 2/4] mm/page_owner: Use scnprintf() to avoid excessive buffer overrun check
Date: Mon, 31 Jan 2022 12:38:45 -0800 [thread overview]
Message-ID: <YfhI1QHRL34QMOCu@carbon.dhcp.thefacebook.com> (raw)
In-Reply-To: <20220131192308.608837-3-longman@redhat.com>
On Mon, Jan 31, 2022 at 02:23:06PM -0500, Waiman Long wrote:
> The snprintf() function can return a length greater than the given
> input size. That will require a check for buffer overrun after each
> invocation of snprintf(). scnprintf(), on the other hand, will never
> return a greater length. By using scnprintf() in selected places, we
> can avoid some buffer overrun checks except after stack_depot_snprint()
> and after the last snprintf().
>
> Signed-off-by: Waiman Long <longman@redhat.com>
> Acked-by: David Rientjes <rientjes@google.com>
> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Roman Gushchin <guro@fb.com>
next prev parent reply other threads:[~2022-01-31 20:39 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-31 19:23 [PATCH v3 0/4] mm/page_owner: Extend page_owner to show memcg information Waiman Long
2022-01-31 19:23 ` [PATCH v3 1/4] lib/vsprintf: Avoid redundant work with 0 size Waiman Long
2022-01-31 20:42 ` Mike Rapoport
2022-01-31 19:23 ` [PATCH v3 2/4] mm/page_owner: Use scnprintf() to avoid excessive buffer overrun check Waiman Long
2022-01-31 20:38 ` Roman Gushchin [this message]
2022-01-31 20:43 ` Mike Rapoport
2022-01-31 19:23 ` [PATCH v3 3/4] mm/page_owner: Print memcg information Waiman Long
2022-01-31 20:51 ` Mike Rapoport
2022-01-31 21:43 ` Waiman Long
2022-02-01 6:23 ` Mike Rapoport
2022-01-31 20:51 ` Roman Gushchin
2022-02-01 10:54 ` Michal Hocko
2022-02-01 17:04 ` Waiman Long
2022-02-02 8:49 ` Michal Hocko
2022-02-02 16:12 ` Waiman Long
2022-01-31 19:23 ` [PATCH v3 4/4] mm/page_owner: Record task command name Waiman Long
2022-01-31 20:54 ` Roman Gushchin
2022-01-31 21:46 ` Waiman Long
2022-01-31 22:03 ` [PATCH v4 " Waiman Long
2022-02-01 15:28 ` Michal Hocko
2022-02-02 16:53 ` Waiman Long
2022-02-03 12:10 ` Vlastimil Babka
2022-02-03 18:53 ` Waiman Long
2022-02-02 20:30 ` [PATCH v4 0/4] mm/page_owner: Extend page_owner to show memcg information Waiman Long
2022-02-02 23:06 ` Rafael Aquini
2022-02-02 20:30 ` [PATCH v4 1/4] lib/vsprintf: Avoid redundant work with 0 size Waiman Long
2022-02-08 10:08 ` Petr Mladek
2022-02-02 20:30 ` [PATCH v4 2/4] mm/page_owner: Use scnprintf() to avoid excessive buffer overrun check Waiman Long
2022-02-03 15:46 ` Vlastimil Babka
2022-02-03 18:49 ` Waiman Long
2022-02-08 10:51 ` Petr Mladek
2022-02-02 20:30 ` [PATCH v4 3/4] mm/page_owner: Print memcg information Waiman Long
2022-02-03 6:53 ` Mike Rapoport
2022-02-03 12:46 ` Michal Hocko
2022-02-03 19:03 ` Waiman Long
2022-02-07 17:20 ` Michal Hocko
2022-02-07 19:09 ` Andrew Morton
2022-02-07 19:33 ` Waiman Long
2022-02-02 20:30 ` [PATCH v4 4/4] mm/page_owner: Record task command name Waiman Long
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