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Smack: fuse mount hang fix

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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@schaufler-ca.com>
Tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Casey Schaufler 2008-06-02 10:04:32 -07:00 committed by Linus Torvalds
parent 246dd412d3
commit e97dcb0ead
1 changed files with 12 additions and 0 deletions
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12
security/smack/smack_lsm.c
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@ -1880,6 +1880,18 @@ 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