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@xxxxxxxxx> > Closes: https://lore.kernel.org/oe-kbuild-all/202401250927.1poZERd6-lkp@xxxxxxxxx/ > Fixes: ab4e4380d4e1 ("Bluetooth: Add vhci devcoredump support") > Link: https://github.com/llvm/llvm-project/commit/ea2e66aa8b6e363b89df66dc44275a0d7ecd70ce [1] > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Kees Cook <kees@xxxxxxxxxx> Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx> > --- > Cc: Marcel Holtmann <marcel@xxxxxxxxxxxx> > Cc: Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> > Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > Cc: Nathan Chancellor <nathan@xxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: linux-bluetooth@xxxxxxxxxxxxxxx > --- > 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 >
