diff options
| author | Kees Cook <kees@kernel.org> | 2024-07-13 21:11:15 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-07-16 07:52:15 -0700 |
| commit | a3bfc095060b51f0198755020daf80d1e14413b1 (patch) | |
| tree | 5e199f65a4dbd33599f45f1427312be2aa3369cd | |
| parent | b49991d83bba4ae77a560c5f021932e8290bd022 (diff) | |
tcp: Replace strncpy() with strscpy()
Replace the deprecated[1] uses of strncpy() in tcp_ca_get_name_by_key()
and tcp_get_default_congestion_control(). The callers use the results as
standard C strings (via nla_put_string() and proc handlers respectively),
so trailing padding is not needed.
Since passing the destination buffer arguments decays it to a pointer,
the size can't be trivially determined by the compiler. ca->name is
the same length in both cases, so strscpy() won't fail (when ca->name
is NUL-terminated). Include the length explicitly instead of using the
2-argument strscpy().
Link: https://github.com/KSPP/linux/issues/90 [1]
Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240714041111.it.918-kees@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ipv4/tcp_cong.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 48617d99abb0..0306d257fa64 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -202,9 +202,10 @@ char *tcp_ca_get_name_by_key(u32 key, char *buffer) rcu_read_lock(); ca = tcp_ca_find_key(key); - if (ca) - ret = strncpy(buffer, ca->name, - TCP_CA_NAME_MAX); + if (ca) { + strscpy(buffer, ca->name, TCP_CA_NAME_MAX); + ret = buffer; + } rcu_read_unlock(); return ret; @@ -337,7 +338,7 @@ void tcp_get_default_congestion_control(struct net *net, char *name) rcu_read_lock(); ca = rcu_dereference(net->ipv4.tcp_congestion_control); - strncpy(name, ca->name, TCP_CA_NAME_MAX); + strscpy(name, ca->name, TCP_CA_NAME_MAX); rcu_read_unlock(); } |