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| author | Christoph Hellwig <hch@lst.de> | 2010-06-04 11:30:04 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-08-09 16:47:39 -0400 |
| commit | 2c27c65ed0696f0b5df2dad2cf6462d72164d547 (patch) | |
| tree | 7d9036e3dea98938f7fd7074366ee73929e9b2e5 /fs/ecryptfs | |
| parent | db78b877f7744bec4a9d9f9e7d10da3931d7cd39 (diff) | |
| download | op-kernel-dev-2c27c65ed0696f0b5df2dad2cf6462d72164d547.zip op-kernel-dev-2c27c65ed0696f0b5df2dad2cf6462d72164d547.tar.gz | |
check ATTR_SIZE contraints in inode_change_ok
Make sure we check the truncate constraints early on in ->setattr by adding
those checks to inode_change_ok. Also clean up and document inode_change_ok
to make this obvious.
As a fallout we don't have to call inode_newsize_ok from simple_setsize and
simplify it down to a truncate_setsize which doesn't return an error. This
simplifies a lot of setattr implementations and means we use truncate_setsize
almost everywhere. Get rid of fat_setsize now that it's trivial and mark
ext2_setsize static to make the calling convention obvious.
Keep the inode_newsize_ok in vmtruncate for now as all callers need an
audit for its removal anyway.
Note: setattr code in ecryptfs doesn't call inode_change_ok at all and
needs a deeper audit, but that is left for later.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ecryptfs')
| -rw-r--r-- | fs/ecryptfs/inode.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 31ef525..82900b0 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -804,10 +804,20 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia, size_t num_zeros = (PAGE_CACHE_SIZE - (ia->ia_size & ~PAGE_CACHE_MASK)); + + /* + * XXX(truncate) this should really happen at the begginning + * of ->setattr. But the code is too messy to that as part + * of a larger patch. ecryptfs is also totally missing out + * on the inode_change_ok check at the beginning of + * ->setattr while would include this. + */ + rc = inode_newsize_ok(inode, ia->ia_size); + if (rc) + goto out; + if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { - rc = simple_setsize(inode, ia->ia_size); - if (rc) - goto out; + truncate_setsize(inode, ia->ia_size); lower_ia->ia_size = ia->ia_size; lower_ia->ia_valid |= ATTR_SIZE; goto out; @@ -830,7 +840,7 @@ static int truncate_upper(struct dentry *dentry, struct iattr *ia, goto out; } } - simple_setsize(inode, ia->ia_size); + truncate_setsize(inode, ia->ia_size); rc = ecryptfs_write_inode_size_to_metadata(inode); if (rc) { printk(KERN_ERR "Problem with " |
