From 936ecbb5750e0e29b9e2464998a8e03eca617b72 Mon Sep 17 00:00:00 2001
From: neilbrown <neilbrown>
Date: Fri, 23 May 2003 03:58:39 +0000
Subject: [PATCH] Stuff

---
 ChangeLog             | 11 +++++++++++
 utils/mountd/cache.c  |  4 ++--
 utils/mountd/mountd.c | 16 +++++++++++++---
 3 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 09277b3..60fd487 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2003-05-23  NeilBrown <neilb@cse.unsw.edu.au>
+
+	* utils/mountd/cache.c(cache_get_filehandle): take a separate path
+	argument as we might not be getting the filehandle for the
+	mountpoint.
+	* utils/mountd/mountd.c(get_rootfh): pass real path when calling
+	cache_get_filehandle.
+	* utils/mountd/mountd.c(get_rootfh): check export point and
+	requested directory are on the same filesystem, and complain if
+	not.
+	
 2003-05-22  NeilBrown <neilb@cse.unsw.edu.au>
 
 	* utils/mountd/auth.c(auth_authenticate_internal): make sure
diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
index 1d1567d..c5bc53f 100644
--- a/utils/mountd/cache.c
+++ b/utils/mountd/cache.c
@@ -335,7 +335,7 @@ void cache_export(nfs_export *exp)
  * } <> /proc/fs/nfs/filehandle
  */
 struct nfs_fh_len *
-cache_get_filehandle(nfs_export *exp, int len)
+cache_get_filehandle(nfs_export *exp, int len, char *p)
 {
 	FILE *f = fopen("/proc/fs/nfs/filehandle", "r+");
 	char buf[200];
@@ -345,7 +345,7 @@ cache_get_filehandle(nfs_export *exp, int len)
 		return NULL;
 
 	qword_print(f, exp->m_client->m_hostname);
-	qword_print(f, exp->m_export.e_path);
+	qword_print(f, p);
 	qword_printint(f, len);	
 	qword_eol(f);
 	
diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
index 145a4da..b1bce1d 100644
--- a/utils/mountd/mountd.c
+++ b/utils/mountd/mountd.c
@@ -25,7 +25,7 @@
 #include "rpcmisc.h"
 
 extern void	cache_open(void);
-extern struct nfs_fh_len *cache_get_filehandle(nfs_export *exp, int len);
+extern struct nfs_fh_len *cache_get_filehandle(nfs_export *exp, int len, char *p);
 extern void cache_export(nfs_export *exp);
 
 extern void my_svc_run(void);
@@ -242,7 +242,7 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, int *error, int v3)
 {
 	struct sockaddr_in *sin =
 		(struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
-	struct stat	stb;
+	struct stat	stb, estb;
 	nfs_export	*exp;
 	char		rpath[MAXPATHLEN+1];
 	char		*p = *path;
@@ -272,6 +272,16 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, int *error, int v3)
 	} else if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 		xlog(L_WARNING, "%s is not a directory or regular file", p);
 		*error = NFSERR_NOTDIR;
+	} else if (stat(exp->m_export.e_path, &estb) < 0) {
+		xlog(L_WARNING, "can't stat export point %s: %s",
+		     p, strerror(errno));
+		*error = NFSERR_NOENT;
+	} else if (estb.st_dev != stb.st_dev
+		   /* && (!new_cache || !(exp->m_export.e_flags & NFSEXP_CROSSMNT)) */
+		) {
+		xlog(L_WARNING, "request to export directory %s below nearest filesystem %s",
+		     p, exp->m_export.e_path);
+		*error = NFSERR_ACCES;
 	} else if (new_cache) {
 		/* This will be a static private nfs_export with just one
 		 * address.  We feed it to kernel then extract the filehandle,
@@ -280,7 +290,7 @@ get_rootfh(struct svc_req *rqstp, dirpath *path, int *error, int v3)
 		struct nfs_fh_len  *fh;
 
 		cache_export(exp);
-		fh = cache_get_filehandle(exp, v3?64:32);
+		fh = cache_get_filehandle(exp, v3?64:32, p);
 		if (fh == NULL) 
 			*error = NFSERR_ACCES;
 		else
-- 
2.39.2