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ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate

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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>
This commit is contained in:
Nikanth Karthikesan 2010-05-16 14:00:00 -04:00 committed by Theodore Ts'o
parent fbe845ddf3
commit 6d19c42b7c
1 changed files with 5 additions and 0 deletions
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5
fs/ext4/extents.c
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@ -3708,6 +3708,11 @@ 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;