diff options
| author | Justin Stitt <justinstitt@google.com> | 2023-10-16 21:42:42 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-10-18 03:59:55 +0300 |
| commit | d4b14c1da5bf2714b4e5c43ca593f17dacabb36c (patch) | |
| tree | 0bb6f1fb04ebf85ce351f1d5a130a95ca116ff8c /drivers/net/hamradio | |
| parent | 5294df643ba6bfee5c70208f0318acd404c2e27d (diff) | |
| download | linux-d4b14c1da5bf2714b4e5c43ca593f17dacabb36c.tar.xz | |
hamradio: replace deprecated strncpy with strscpy_pad
strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
We expect both hi.data.modename and hi.data.drivername to be
NUL-terminated based on its usage with sprintf:
| sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
| bc->cfg.intclk ? "int" : "ext",
| bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
| bc->cfg.loopback ? ",loopback" : "");
Note that this data is copied out to userspace with:
| if (copy_to_user(data, &hi, sizeof(hi)))
... however, the data was also copied FROM the user here:
| if (copy_from_user(&hi, data, sizeof(hi)))
Considering the above, a suitable replacement is strscpy_pad() as it
guarantees NUL-termination on the destination buffer while also
NUL-padding (which is good+wanted behavior when copying data to
userspace).
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231016-strncpy-drivers-net-hamradio-baycom_epp-c-v2-1-39f72a72de30@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/hamradio')
| -rw-r--r-- | drivers/net/hamradio/baycom_epp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c index 83ff882f5d97..ccfc83857c26 100644 --- a/drivers/net/hamradio/baycom_epp.c +++ b/drivers/net/hamradio/baycom_epp.c @@ -1074,7 +1074,7 @@ static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr, return 0; case HDLCDRVCTL_DRIVERNAME: - strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername)); + strscpy_pad(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername)); break; case HDLCDRVCTL_GETMODE: @@ -1091,7 +1091,7 @@ static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr, return baycom_setmode(bc, hi.data.modename); case HDLCDRVCTL_MODELIST: - strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x", + strscpy_pad(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x", sizeof(hi.data.modename)); break; |