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| author | Nikanth Karthikesan <knikanth@suse.de> | 2010-05-30 22:49:57 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:21:21 -0700 |
| commit | 0a27a9e513fa9a229745fe94e42b020f66a7ec10 (patch) | |
| tree | a40876a3a8f9550b5d5802e97c1e7bccd1071485 | |
| parent | 2421348fe2154e9ddadf25794d19833649790db5 (diff) | |
ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate
commit 6d19c42b7cf81c39632b6d4dbc514e8449bcd346 upstream (as of v2.6.34-git13)
Currently using posix_fallocate one can bypass an RLIMIT_FSIZE limit
and create a file larger than the limit. Add a check for that.
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Amit Arora <aarora@in.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/ext4/extents.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index cd4ccccaf2d9..aca259f4b5b4 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3607,6 +3607,11 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len) */ credits = ext4_chunk_trans_blocks(inode, max_blocks); mutex_lock(&inode->i_mutex); + ret = inode_newsize_ok(inode, (len + offset)); + if (ret) { + mutex_unlock(&inode->i_mutex); + return ret; + } retry: while (ret >= 0 && ret < max_blocks) { block = block + ret; |