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Don't use the explicit number 32 for the length of the secrets,

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use sizeof() or explicit #definesi instead. No functional change.
This was suggested by jmg@.

MFC after:		1 month
XMFC with:		r338053
Sponsored by:		Netflix, Inc.
This commit is contained in:
Michael Tuexen 2018-08-23 06:03:59 +00:00
parent 2324e9b028
commit 4ba1513d1a
1 changed files with 10 additions and 6 deletions
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16
sys/netinet/tcp_subr.c
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@ -233,7 +233,8 @@ VNET_DEFINE(uma_zone_t, sack_hole_zone);
VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
#endif
VNET_DEFINE_STATIC(u_char, ts_offset_secret[32]);
#define TS_OFFSET_SECRET_LENGTH 32
VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]);
#define V_ts_offset_secret VNET(ts_offset_secret)
static int tcp_default_fb_init(struct tcpcb *tp);
@ -2608,7 +2609,7 @@ tcp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
#endif /* INET6 */
static uint32_t
tcp_keyed_hash(struct in_conninfo *inc, u_char *key)
tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len)
{
MD5_CTX ctx;
uint32_t hash[4];
@ -2630,7 +2631,7 @@ tcp_keyed_hash(struct in_conninfo *inc, u_char *key)
break;
#endif
}
MD5Update(&ctx, key, 32);
MD5Update(&ctx, key, len);
MD5Final((unsigned char *)hash, &ctx);
return (hash[0]);
@ -2639,7 +2640,8 @@ tcp_keyed_hash(struct in_conninfo *inc, u_char *key)
uint32_t
tcp_new_ts_offset(struct in_conninfo *inc)
{
return (tcp_keyed_hash(inc, V_ts_offset_secret));
return (tcp_keyed_hash(inc, V_ts_offset_secret,
sizeof(V_ts_offset_secret)));
}
/*
@ -2689,8 +2691,9 @@ tcp_new_ts_offset(struct in_conninfo *inc)
#define ISN_BYTES_PER_SECOND 1048576
#define ISN_STATIC_INCREMENT 4096
#define ISN_RANDOM_INCREMENT (4096 - 1)
#define ISN_SECRET_LENGTH 32
VNET_DEFINE_STATIC(u_char, isn_secret[32]);
VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]);
VNET_DEFINE_STATIC(int, isn_last);
VNET_DEFINE_STATIC(int, isn_last_reseed);
VNET_DEFINE_STATIC(u_int32_t, isn_offset);
@ -2718,7 +2721,8 @@ tcp_new_isn(struct in_conninfo *inc)
}
/* Compute the md5 hash and return the ISN. */
new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret);
new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret,
sizeof(V_isn_secret));
V_isn_offset += ISN_STATIC_INCREMENT +
(arc4random() & ISN_RANDOM_INCREMENT);
if (ticks != V_isn_last) {