Prevent creation of files larger than RLIMIT_FSIZE using fallocate

PATCH New Nikanth Karthikesan 1 participant 1 message Jun 16, 2010 Btrfs file system

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Nikanth Karthikesan

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2010-06-16 08:30 UTC #0 lore raw

PATCH 1/1 Prevent creation of files larger than RLIMIT_FSIZE using fallocate

Hi Chris

I am resending this based on the btrfs-unstable tree. Please apply/reply.

Thanks
Nikanth

Prevent creation of files larger than RLIMIT_FSIZE using fallocate.

Currently using posix_fallocate one can bypass an RLIMIT_FSIZE limit and create a larger file than the limit. Add a check for that.

Signed-off-by Nikanth Karthikesan <[email protected]>

Cc Amit K. Arora <[email protected]>

---

fs/btrfs/inode.c +5 -0

index f08427c..7870f4f 100644
@@ -6842,6 +6842,11 @@ static long btrfs_fallocate(struct inode *inode, int mode,
 	btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start);
 
 	mutex_lock(&inode->i_mutex);
+
+	ret = inode_newsize_ok(inode, (offset + len));
+	if (ret)
+		goto out;
+
 	if (alloc_start > inode->i_size) {
 		ret = btrfs_cont_expand(inode, alloc_start);
 		if (ret)