From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Hao Chen <chenhao418@huawei.com>,
kernel test robot <lkp@intel.com>, Hao Lan <lanhao@huawei.com>,
Paolo Abeni <pabeni@redhat.com>, Sasha Levin <sashal@kernel.org>,
yisen.zhuang@huawei.com, salil.mehta@huawei.com,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
guoren@kernel.org, huangguangbin2@huawei.com,
netdev@vger.kernel.org, linux-csky@vger.kernel.org
Subject: [PATCH AUTOSEL 6.1 18/18] net: hns3: fix strncpy() not using dest-buf length as length issue
Date: Sun, 9 Jul 2023 11:14:46 -0400 [thread overview]
Message-ID: <20230709151446.513549-18-sashal@kernel.org> (raw)
In-Reply-To: <20230709151446.513549-1-sashal@kernel.org>
From: Hao Chen <chenhao418@huawei.com>
[ Upstream commit 1cf3d5567f273a8746d1bade00633a93204f80f0 ]
Now, strncpy() in hns3_dbg_fill_content() use src-length as copy-length,
it may result in dest-buf overflow.
This patch is to fix intel compile warning for csky-linux-gcc (GCC) 12.1.0
compiler.
The warning reports as below:
hclge_debugfs.c:92:25: warning: 'strncpy' specified bound depends on
the length of the source argument [-Wstringop-truncation]
strncpy(pos, items[i].name, strlen(items[i].name));
hclge_debugfs.c:90:25: warning: 'strncpy' output truncated before
terminating nul copying as many bytes from a string as its length
[-Wstringop-truncation]
strncpy(pos, result[i], strlen(result[i]));
strncpy() use src-length as copy-length, it may result in
dest-buf overflow.
So,this patch add some values check to avoid this issue.
Signed-off-by: Hao Chen <chenhao418@huawei.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/lkml/202207170606.7WtHs9yS-lkp@intel.com/T/
Signed-off-by: Hao Lan <lanhao@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../ethernet/hisilicon/hns3/hns3_debugfs.c | 31 ++++++++++++++-----
.../hisilicon/hns3/hns3pf/hclge_debugfs.c | 29 ++++++++++++++---
2 files changed, 48 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
index bcccd82a2620f..f6ededec5a4fa 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
@@ -435,19 +435,36 @@ static void hns3_dbg_fill_content(char *content, u16 len,
const struct hns3_dbg_item *items,
const char **result, u16 size)
{
+#define HNS3_DBG_LINE_END_LEN 2
char *pos = content;
+ u16 item_len;
u16 i;
+ if (!len) {
+ return;
+ } else if (len <= HNS3_DBG_LINE_END_LEN) {
+ *pos++ = '\0';
+ return;
+ }
+
memset(content, ' ', len);
- for (i = 0; i < size; i++) {
- if (result)
- strncpy(pos, result[i], strlen(result[i]));
- else
- strncpy(pos, items[i].name, strlen(items[i].name));
+ len -= HNS3_DBG_LINE_END_LEN;
- pos += strlen(items[i].name) + items[i].interval;
+ for (i = 0; i < size; i++) {
+ item_len = strlen(items[i].name) + items[i].interval;
+ if (len < item_len)
+ break;
+
+ if (result) {
+ if (item_len < strlen(result[i]))
+ break;
+ strscpy(pos, result[i], strlen(result[i]));
+ } else {
+ strscpy(pos, items[i].name, strlen(items[i].name));
+ }
+ pos += item_len;
+ len -= item_len;
}
-
*pos++ = '\n';
*pos++ = '\0';
}
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
index 142415c84c6b2..0ebc21401b7c2 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
@@ -87,16 +87,35 @@ static void hclge_dbg_fill_content(char *content, u16 len,
const struct hclge_dbg_item *items,
const char **result, u16 size)
{
+#define HCLGE_DBG_LINE_END_LEN 2
char *pos = content;
+ u16 item_len;
u16 i;
+ if (!len) {
+ return;
+ } else if (len <= HCLGE_DBG_LINE_END_LEN) {
+ *pos++ = '\0';
+ return;
+ }
+
memset(content, ' ', len);
+ len -= HCLGE_DBG_LINE_END_LEN;
+
for (i = 0; i < size; i++) {
- if (result)
- strncpy(pos, result[i], strlen(result[i]));
- else
- strncpy(pos, items[i].name, strlen(items[i].name));
- pos += strlen(items[i].name) + items[i].interval;
+ item_len = strlen(items[i].name) + items[i].interval;
+ if (len < item_len)
+ break;
+
+ if (result) {
+ if (item_len < strlen(result[i]))
+ break;
+ strscpy(pos, result[i], strlen(result[i]));
+ } else {
+ strscpy(pos, items[i].name, strlen(items[i].name));
+ }
+ pos += item_len;
+ len -= item_len;
}
*pos++ = '\n';
*pos++ = '\0';
--
2.39.2
parent reply other threads:[~2023-07-09 15:18 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20230709151446.513549-1-sashal@kernel.org>]
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