From: Casey Schaufler Date: Mon, 2 Jun 2008 17:04:32 +0000 (-0700) Subject: Smack: fuse mount hang fix X-Git-Tag: v2.6.26-rc5~6 X-Git-Url: http://git.sourceforge.jp/view?a=commitdiff_plain;h=e97dcb0eadbb821eccd549d4987b653cf61e2374;p=linux-kernel-docs%2Flinux-2.6.git Smack: fuse mount hang fix 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 Tested-by: Luiz Fernando N. Capitulino Signed-off-by: Linus Torvalds --- diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index b5c8f92370..4a09293efa 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1881,6 +1881,18 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) 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