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authorMiklos Szeredi <mszeredi@suse.cz>2013-09-16 16:52:05 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-09-17 03:17:24 +0400
commit116cc0225381415b96551f725455d067f63a76a0 (patch)
treeb30640ef8f0c7ef1b412d08f50f3ab28f69e5127 /fs
parent01c919abaf2f3d6a8e59eddf4ee22df1631ab067 (diff)
downloadlinux-116cc0225381415b96551f725455d067f63a76a0.tar.xz
vfs: don't set FILE_CREATED before calling ->atomic_open()
If O_CREAT|O_EXCL are passed to open, then we know that either - the file is successfully created, or - the operation fails in some way. So previously we set FILE_CREATED before calling ->atomic_open() so the filesystem doesn't have to. This, however, led to bugs in the implementation that went unnoticed when the filesystem didn't check for existence, yet returned success. To prevent this kind of bug, require filesystems to always explicitly set FILE_CREATED on O_CREAT|O_EXCL and verify this in the VFS. Also added a couple more verifications for the result of atomic_open(): - Warn if filesystem set FILE_CREATED despite the lack of O_CREAT. - Warn if filesystem set FILE_CREATED but gave a negative dentry. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 0dc4cbf21f37..22eb5484774c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2656,6 +2656,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
int acc_mode;
int create_error = 0;
struct dentry *const DENTRY_NOT_SET = (void *) -1UL;
+ bool excl;
BUG_ON(dentry->d_inode);
@@ -2669,10 +2670,9 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
mode &= ~current_umask();
- if ((open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT)) {
+ excl = (open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT);
+ if (excl)
open_flag &= ~O_TRUNC;
- *opened |= FILE_CREATED;
- }
/*
* Checking write permission is tricky, bacuse we don't know if we are
@@ -2726,7 +2726,11 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
}
acc_mode = op->acc_mode;
+ if (WARN_ON(excl && !(*opened & FILE_CREATED)))
+ *opened |= FILE_CREATED;
+
if (*opened & FILE_CREATED) {
+ WARN_ON(!(open_flag & O_CREAT));
fsnotify_create(dir, dentry);
acc_mode = MAY_OPEN;
}
@@ -2740,6 +2744,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
dput(dentry);
dentry = file->f_path.dentry;
}
+ WARN_ON(!dentry->d_inode && (*opened & FILE_CREATED));
if (create_error && dentry->d_inode == NULL) {
error = create_error;
goto out;