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Commit 6d19c42b authored by Nikanth Karthikesan's avatar Nikanth Karthikesan Committed by Theodore Ts'o
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ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate 



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: default avatarNikanth Karthikesan <knikanth@suse.de>
Signed-off-by: default avatarAmit Arora <aarora@in.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent fbe845dd

fs/ext4/extents.c

+5 −0
Original line number Diff line number Diff line
@@ -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;