RE: [PATCH] staging/rtl8192u: Remove all strcpy() uses in favor of strscpy()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Len Baker
> Sent: 18 July 2021 12:32
> 
> strcpy() performs no bounds checking on the destination buffer. This
> could result in linear overflows beyond the end of the buffer, leading
> to all kinds of misbehaviors. The safe replacement is strscpy().
> 
> Signed-off-by: Len Baker <len.baker@xxxxxxx>
> ---
>  drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> index ab885353f668..1a193f900779 100644
> --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> @@ -2226,7 +2226,8 @@ static void ieee80211_start_ibss_wq(struct work_struct *work)
>  	mutex_lock(&ieee->wx_mutex);
> 
>  	if (ieee->current_network.ssid_len == 0) {
> -		strcpy(ieee->current_network.ssid, IEEE80211_DEFAULT_TX_ESSID);
> +		strscpy(ieee->current_network.ssid, IEEE80211_DEFAULT_TX_ESSID,
> +			sizeof(ieee->current_network.ssid));

I'm pretty sure that recent compiler releases know enough
about strcpy() to error overflows for strcpy() from quoted
strings into char[].

If these checks are enabled for kernel builds then they are
actually safer than the run-time check above
(which can be mistyped).

The compiler can (it may not) convert the strcpy() into a memcpy()
using the compile-time length of the quoted string.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)






[Index of Archives]     [Linux Driver Development]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux