* [PATCH btrfs-unstable#master] Prevent creation of files larger than RLIMIT_FSIZE using fallocate
@ 2010-06-16 8:30 Nikanth Karthikesan
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From: Nikanth Karthikesan @ 2010-06-16 8:30 UTC (permalink / raw)
To: Chris Mason; +Cc: linux-btrfs, Amit K. Arora
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 <knikanth@suse.de>
Cc: Amit K. Arora <aarora@linux.vnet.ibm.com>
---
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f08427c..7870f4f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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)
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