[PATCH 4.4 37/38] netfilter: xt_RATEEST: reject non-null terminated string from userspace

Greg Kroah-Hartman
2021-01-11T14:09:35Z

From: Florian Westphal <fw@strlen.de>

commit 6cb56218ad9e580e519dcd23bfb3db08d8692e5a upstream.

syzbot reports:
detected buffer overflow in strlen
[..]
Call Trace:
strlen include/linux/string.h:325 [inline]
strlcpy include/linux/string.h:348 [inline]
xt_rateest_tg_checkentry+0x2a5/0x6b0 net/netfilter/xt_RATEEST.c:143

strlcpy assumes src is a c-string. Check info->name before its used.

Reported-by: syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com
Fixes: 5859034d7eb8793 ("[NETFILTER]: x_tables: add RATEEST target")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/netfilter/xt_RATEEST.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/netfilter/xt_RATEEST.c
+++ b/net/netfilter/xt_RATEEST.c
@@ -107,6 +107,9 @@ static int xt_rateest_tg_checkentry(cons
} cfg;
int ret;

+ if (strnlen(info->name, sizeof(est->name)) >= sizeof(est->name))
+ return -ENAMETOOLONG;
+
if (unlikely(!rnd_inited)) {
get_random_bytes(&jhash_rnd, sizeof(jhash_rnd));
rnd_inited = true;