LINUX: Dir follow_link should set LAST_BIND

For our faux-symlink directory follow_link operation, we leave the
given nameidata struct with an invalid 'last' component. That is,
nd->last is not changed or set to anything meaningful.

Usually the callers of our follow_link op do not care about the last
component of the nameidata. However, at least one caller does: the
caller near the do_link label in open_namei(). This is called during
processing for O_CREAT operations on symlinks, and since our
directories look like symlinks, it gets called. It tries to use
nd->last to look up the last component of the dereferenced path (so it
can try to create it, as necessary), but since our nd->last is not
set, this will not work.

Specifically, our nd->last.name is not pointing into the names cache,
so the subsequent putname/__putname on it will corrupt the names
cache. However, even if this were not a problem, the actual contents
of the last component do not seem meaningful so this would probably
result in incorrect behavior anyway.

To avoid all of this, set nd->last_type to LAST_BIND, so any callers
know that the last component of the given nd is not valid, and we are
pointing directly to the target component with a dentry.

Reviewed-on: http://gerrit.openafs.org/8489
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit bd57c7d64844ca26d80f2b29db470dacd134fc56)

Change-Id: I4defb55064a4452e437b8a6c3e600887b4749fff
Reviewed-on: http://gerrit.openafs.org/8543
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Tested-by: Stephan Wiesand <stephan.wiesand@desy.de>

diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index 10289083b65c5616aaaf41724529fc40e5b77568..844768a255875500b7c871fba40cb85c08a58535 100644 (file)
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -2645,6 +2645,8 @@ afs_linux_dir_follow_link(struct dentry *dentry, struct nameidata *nd)
        *dpp = dget(dentry);
     }
 
+    nd->last_type = LAST_BIND;
+
     return NULL;
 }
 #endif /* !STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT */

diff --git a/src/afs/LINUX24/osi_vnodeops.c b/src/afs/LINUX24/osi_vnodeops.c
index 2fd1a226dc041297b3367af322f45eb9e41fc87a..87f7e37aad2289c630afa21b07a4d261f3fb69dd 100644 (file)
--- a/src/afs/LINUX24/osi_vnodeops.c
+++ b/src/afs/LINUX24/osi_vnodeops.c
@@ -2083,6 +2083,8 @@ afs_linux_dir_follow_link(struct dentry *dentry, struct nameidata *nd)
        *dpp = dget(dentry);
     }
 
+    nd->last_type = LAST_BIND;
+
     return 0;
 }