From 85352dd5ffd0d9a451b79fa61d24a518b553d280 Mon Sep 17 00:00:00 2001 From: Jose Castillo Date: Fri, 19 Apr 2013 10:51:57 -0400 Subject: [PATCH 1/1] mountd: Add the missing '$' in auth_unix_ip() We found this problem because NFS clients to a RHEL6 NFS server were experiencing periods of ESTALE errors after being mounted and initially working successfully. Tests were run which snapshotted the nfs/sunrpc caches before and after the issue, and it was found that the '$' character at the beginning of the ID strings, used when in use_ipaddr mode, was getting lost: GOOD, while mount was working: nfsd 1.2.3.4 $1.2.3.4 BAD, after mount started returning ESTALE: nfsd 1.2.3.4 1.2.3.4 This would then cause the export checks to fail by passing '1.2.3.4' instead of '$1.2.3.4' up to rpc.mountd. The problem appears to be in the auth_unix_ip() function when renewing the auth.unix.ip cache entry. It would fail to add the '$' character back to the beginning of the string used for the domain string, breaking the use_ipaddr mode. Signed-off-by: Jose Castillo Signed-off-by: Steve Dickson --- utils/mountd/cache.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c index 978698d..e1027f3 100644 --- a/utils/mountd/cache.c +++ b/utils/mountd/cache.c @@ -80,7 +80,7 @@ static void auth_unix_ip(FILE *f) */ char *cp; char class[20]; - char ipaddr[INET6_ADDRSTRLEN]; + char ipaddr[INET6_ADDRSTRLEN + 1]; char *client = NULL; struct addrinfo *tmp = NULL; if (readline(fileno(f), &lbuf, &lbuflen) != 1) @@ -94,7 +94,7 @@ static void auth_unix_ip(FILE *f) strcmp(class, "nfsd") != 0) return; - if (qword_get(&cp, ipaddr, sizeof(ipaddr)) <= 0) + if (qword_get(&cp, ipaddr, sizeof(ipaddr) - 1) <= 0) return; tmp = host_pton(ipaddr); @@ -116,9 +116,11 @@ static void auth_unix_ip(FILE *f) qword_print(f, "nfsd"); qword_print(f, ipaddr); qword_printtimefrom(f, DEFAULT_TTL); - if (use_ipaddr) + if (use_ipaddr) { + memmove(ipaddr + 1, ipaddr, strlen(ipaddr) + 1); + ipaddr[0] = '$'; qword_print(f, ipaddr); - else if (client) + } else if (client) qword_print(f, *client?client:"DEFAULT"); qword_eol(f); xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT"); -- 2.39.2