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docs: networking: Replace strncpy() with strscpy() 

Replace example code's use of strncpy() with strscpy() functions. Using
strncpy() is considered deprecated:
https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20210602202914.4079123-1-keescook@chromium.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Kees Cook 2021-06-02 13:29:14 -07:00 committed by Jonathan Corbet
parent 709dedfdf3
commit f9ce26c56d
3 changed files with 3 additions and 3 deletions
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2
Documentation/input/joydev/joystick-api.rst
View File

@ -263,7 +263,7 @@ possible overrun should the name be too long::
char name[128];
if (ioctl(fd, JSIOCGNAME(sizeof(name)), name) < 0)
strncpy(name, "Unknown", sizeof(name));
strscpy(name, "Unknown", sizeof(name));
printf("Name: %s\n", name);

2
Documentation/networking/packet_mmap.rst
View File

@ -153,7 +153,7 @@ As capture, each frame contains two parts::
struct ifreq s_ifr;
...
strncpy (s_ifr.ifr_name, "eth0", sizeof(s_ifr.ifr_name));
strscpy_pad (s_ifr.ifr_name, "eth0", sizeof(s_ifr.ifr_name));
/* get interface index of eth0 */
ioctl(this->socket, SIOCGIFINDEX, &s_ifr);

2
Documentation/networking/tuntap.rst
View File

@ -107,7 +107,7 @@ Note that the character pointer becomes overwritten with the real device name
*/
ifr.ifr_flags = IFF_TUN;
if( *dev )
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
strscpy_pad(ifr.ifr_name, dev, IFNAMSIZ);
if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
close(fd);