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authorAhmed S. Darwish <darwish.07@gmail.com>2008-03-24 12:29:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-24 19:22:19 -0700
commitcb622bbb69e41f2746aadf5d7d527e77597abe2e (patch)
tree537a1ce6f76bd915bf9acd197d6bf4d042063998 /security/smack/smackfs.c
parent58336114af4d2cce830201aae49e50b93ede6c5c (diff)
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smackfs: remove redundant lock, fix open(,O_RDWR)
Older smackfs was parsing MAC rules by characters, thus a need of locking write sessions on open() was needed. This lock is no longer useful now since each rule is handled by a single write() call. This is also a bugfix since seq_open() was not called if an open() O_RDWR flag was given, leading to a seq_read() without an initialized seq_file, thus an Oops. Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com> Reported-by: Jonathan Corbet <corbet@lwn.net> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c35
1 files changed, 2 insertions, 33 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index afe7c9b0732..cfae8afcc26 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -74,11 +74,6 @@ struct smk_list_entry *smack_list;
#define SEQ_READ_FINISHED 1
/*
- * Disable concurrent writing open() operations
- */
-static struct semaphore smack_write_sem;
-
-/*
* Values for parsing cipso rules
* SMK_DIGITLEN: Length of a digit field in a rule.
* SMK_CIPSOMIN: Minimum possible cipso rule length.
@@ -168,32 +163,7 @@ static struct seq_operations load_seq_ops = {
*/
static int smk_open_load(struct inode *inode, struct file *file)
{
- if ((file->f_flags & O_ACCMODE) == O_RDONLY)
- return seq_open(file, &load_seq_ops);
-
- if (down_interruptible(&smack_write_sem))
- return -ERESTARTSYS;
-
- return 0;
-}
-
-/**
- * smk_release_load - release() for /smack/load
- * @inode: inode structure representing file
- * @file: "load" file pointer
- *
- * For a reading session, use the seq_file release
- * implementation.
- * Otherwise, we are at the end of a writing session so
- * clean everything up.
- */
-static int smk_release_load(struct inode *inode, struct file *file)
-{
- if ((file->f_flags & O_ACCMODE) == O_RDONLY)
- return seq_release(inode, file);
-
- up(&smack_write_sem);
- return 0;
+ return seq_open(file, &load_seq_ops);
}
/**
@@ -341,7 +311,7 @@ static const struct file_operations smk_load_ops = {
.read = seq_read,
.llseek = seq_lseek,
.write = smk_write_load,
- .release = smk_release_load,
+ .release = seq_release,
};
/**
@@ -1011,7 +981,6 @@ static int __init init_smk_fs(void)
}
}
- sema_init(&smack_write_sem, 1);
smk_cipso_doi();
smk_unlbl_ambient(NULL);