linux-kernel - [PATCH] dma-buf/sw_sync: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230523021943.2406847-1-azeemshaikh38@gmail.com>
Date:   Tue, 23 May 2023 02:19:43 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Christian König <christian.koenig@....com>,
        linaro-mm-sig@...ts.linaro.org
Subject: [PATCH] dma-buf/sw_sync: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 drivers/dma-buf/sw_sync.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 348b3a9170fa..63f0aeb66db6 100644
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -85,7 +85,7 @@ static struct sync_timeline *sync_timeline_create(const char *name)
 
 	kref_init(&obj->kref);
 	obj->context = dma_fence_context_alloc(1);
-	strlcpy(obj->name, name, sizeof(obj->name));
+	strscpy(obj->name, name, sizeof(obj->name));
 
 	obj->pt_tree = RB_ROOT;
 	INIT_LIST_HEAD(&obj->pt_list);