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netfilter: xt_CT: Reject the non-null terminated string from user space 

The helper and timeout strings are from user-space, we need to make
sure they are null terminated. If not, evil user could make kernel
read the unexpected memory, even print it when fail to find by the
following codes.

pr_info_ratelimited("No such helper \"%s\"\n", helper_name);

Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
hifive-unleashed-5.1
Gao Feng 2018-05-30 10:29:31 +08:00 committed by Pablo Neira Ayuso
parent 664088f8d6
commit 8f4d19aacb
1 changed files with 10 additions and 0 deletions
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10
net/netfilter/xt_CT.c
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@ -245,12 +245,22 @@ static int xt_ct_tg_check(const struct xt_tgchk_param *par,
}
if (info->helper[0]) {
if (strnlen(info->helper, sizeof(info->helper)) == sizeof(info->helper)) {
ret = -ENAMETOOLONG;
goto err3;
}
ret = xt_ct_set_helper(ct, info->helper, par);
if (ret < 0)
goto err3;
}
if (info->timeout[0]) {
if (strnlen(info->timeout, sizeof(info->timeout)) == sizeof(info->timeout)) {
ret = -ENAMETOOLONG;
goto err4;
}
ret = xt_ct_set_timeout(ct, par, info->timeout);
if (ret < 0)
goto err4;