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