From: Zeng Tao <prime.zeng@hisilicon.com>
To: <sudeep.holla@arm.com>
Cc: <linuxarm@huawei.com>, Zeng Tao <prime.zeng@hisilicon.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH v2] cpu-topology: Fix the potential data corruption
Date: Wed, 4 Mar 2020 11:54:52 +0800 [thread overview]
Message-ID: <1583294092-5929-1-git-send-email-prime.zeng@hisilicon.com> (raw)
Currently there are only 10 bytes to store the cpu-topology 'name'
information. Only 10 bytes copied into cluster/thread/core names.
If the cluster ID exceeds 2-digit number, it will result in the data
corruption, and ending up in a dead loop in the parsing routines. The
same applies to the thread names with more that 3-digit number.
This issue was found using the boundary tests under virtualised
environment like QEMU.
Let us increase the buffer to fix such potential issues.
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Zeng Tao <prime.zeng@hisilicon.com>
---
Changelog:
v1->v2: update the commit message suggested by sudeep.
---
drivers/base/arch_topology.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 6119e11..f489883 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -281,7 +281,7 @@ static int __init get_cpu_for_node(struct device_node *node)
static int __init parse_core(struct device_node *core, int package_id,
int core_id)
{
- char name[10];
+ char name[20];
bool leaf = true;
int i = 0;
int cpu;
@@ -327,7 +327,7 @@ static int __init parse_core(struct device_node *core, int package_id,
static int __init parse_cluster(struct device_node *cluster, int depth)
{
- char name[10];
+ char name[20];
bool leaf = true;
bool has_cores = false;
struct device_node *c;
--
2.8.1
reply other threads:[~2020-03-04 3:58 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1583294092-5929-1-git-send-email-prime.zeng@hisilicon.com \
--to=prime.zeng@hisilicon.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxarm@huawei.com \
--cc=rafael@kernel.org \
--cc=sudeep.holla@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).