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From 23d3980b6cfea4e9056d9b7b81e48b4fefc645e0 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 7 May 2013 11:46:18 -0400
Subject: [PATCH] mountd: Fix is_subdirectory again
The problem was that is_subdirectory() would also succeed if the two
directories were the same. This is needed for path_matches() which
needs to see if the child is same-or-descendant.
So this patch rearranges path_matches() to do the "are they the same"
test itself and only bother with is_subdirectory() if it they are not
the same.
So now is_subdirectory() can be strict, and so can be usable for
subexport(), which needs a strong 'in subdirectory - not the same' test.
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
---
utils/mountd/cache.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
index 737927c..517aa62 100644
--- a/utils/mountd/cache.c
+++ b/utils/mountd/cache.c
@@ -347,20 +347,26 @@ static char *next_mnt(void **v, char *p)
static int is_subdirectory(char *child, char *parent)
{
+ /* Check is child is strictly a subdirectory of
+ * parent or a more distant descendant.
+ */
size_t l = strlen(parent);
- if (strcmp(parent, "/") == 0)
+ if (strcmp(parent, "/") == 0 && child[1] != 0)
return 1;
- return strcmp(child, parent) == 0
- || (strncmp(child, parent, l) == 0 && child[l] == '/');
+ return (strncmp(child, parent, l) == 0 && child[l] == '/');
}
static int path_matches(nfs_export *exp, char *path)
{
- if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
- return is_subdirectory(path, exp->m_export.e_path);
- return strcmp(path, exp->m_export.e_path) == 0;
+ /* Does the path match the export? I.e. is it an
+ * exact match, or does the export have CROSSMOUNT, and path
+ * is a descendant?
+ */
+ return strcmp(path, exp->m_export.e_path) == 0
+ || ((exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
+ && is_subdirectory(path, exp->m_export.e_path));
}
static int
@@ -369,15 +375,13 @@ export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
return path_matches(exp, path) && client_matches(exp, dom, ai);
}
-/* True iff e1 is a child of e2 and e2 has crossmnt set: */
+/* True iff e1 is a child of e2 (or descendant) and e2 has crossmnt set: */
static bool subexport(struct exportent *e1, struct exportent *e2)
{
char *p1 = e1->e_path, *p2 = e2->e_path;
- size_t l2 = strlen(p2);
return e2->e_flags & NFSEXP_CROSSMOUNT
- && strncmp(p1, p2, l2) == 0
- && p1[l2] == '/';
+ && is_subdirectory(p1, p2);
}
struct parsed_fsid {
--
1.8.3.2
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