On Tue, Apr 15, 2025 at 09:15:19AM -0700, Kees Cook wrote:

Avoid double-copying of string literals. Use a "const char *" for each string instead of copying from .rodata into stack and then into the skb. We can go directly from .rodata to the skb.

This also works around a Clang bug (that has since been fixed[1]).

Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202401250927.1poZERd6-lkp@intel.com/ Fixes: ab4e4380d4e1 ("Bluetooth: Add vhci devcoredump support") Link: https://github.com/llvm/llvm-project/commit/ea2e66aa8b6e363b89df66dc44275a0d... [1] Cc: stable@vger.kernel.org Signed-off-by: Kees Cook kees@kernel.org

Reviewed-by: Nathan Chancellor nathan@kernel.org

---

Cc: Marcel Holtmann marcel@holtmann.org Cc: Luiz Augusto von Dentz luiz.dentz@gmail.com Cc: Josh Poimboeuf jpoimboe@kernel.org Cc: Nathan Chancellor nathan@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: linux-bluetooth@vger.kernel.org

---

drivers/bluetooth/hci_vhci.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c index 7651321d351c..9ac22e4a070b 100644 --- a/drivers/bluetooth/hci_vhci.c +++ b/drivers/bluetooth/hci_vhci.c @@ -289,18 +289,18 @@ static void vhci_coredump(struct hci_dev *hdev) static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb) {

• char buf[80];

• const char *buf;

• snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n");

• buf = "Controller Name: vhci_ctrl\n"; skb_put_data(skb, buf, strlen(buf));

• snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n");

• buf = "Firmware Version: vhci_fw\n"; skb_put_data(skb, buf, strlen(buf));

• snprintf(buf, sizeof(buf), "Driver: vhci_drv\n");

• buf = "Driver: vhci_drv\n"; skb_put_data(skb, buf, strlen(buf));

• snprintf(buf, sizeof(buf), "Vendor: vhci\n");

• buf = "Vendor: vhci\n"; skb_put_data(skb, buf, strlen(buf));

} -- 2.34.1