The patch titled
smack: fix fuse mount hang
has been added to the -mm tree. Its filename is
smack-fuse-mount-hang-fix.patch
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------------------------------------------------------
Subject: smack: fix fuse mount hang
From: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
The d_instantiate hook for Smack can hang on the root inode of a
filesystem if the file system code has not really done all the set-up.
Fuse is known to encounter this problem. This change detects an attempt
to instantiate a root inode and addresses it early in the processing,
before any attempt is made to do something that might hang.
Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Tested-by: Luiz Fernando N. Capitulino <lcapitulino@xxxxxxxxxxxxxxx>
Cc: "Ahmed S. Darwish" <darwish.07@xxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
security/smack/smack_lsm.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff -puN security/smack/smack_lsm.c~smack-fuse-mount-hang-fix security/smack/smack_lsm.c
--- a/security/smack/smack_lsm.c~smack-fuse-mount-hang-fix
+++ a/security/smack/smack_lsm.c
@@ -1881,6 +1881,18 @@ static void smack_d_instantiate(struct d
final = sbsp->smk_default;
/*
+ * If this is the root inode the superblock
+ * may be in the process of initialization.
+ * If that is the case use the root value out
+ * of the superblock.
+ */
+ if (opt_dentry->d_parent == opt_dentry) {
+ isp->smk_inode = sbsp->smk_root;
+ isp->smk_flags |= SMK_INODE_INSTANT;
+ goto unlockandout;
+ }
+
+ /*
* This is pretty hackish.
* Casey says that we shouldn't have to do
* file system specific code, but it does help
_
Patches currently in -mm which might be from casey@xxxxxxxxxxxxxxxx are
smack-fuse-mount-hang-fix.patch
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