From 0a27a9e513fa9a229745fe94e42b020f66a7ec10 Mon Sep 17 00:00:00 2001 From: Nikanth Karthikesan Date: Sun, 30 May 2010 22:49:57 -0400 Subject: [PATCH] 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 Signed-off-by: Amit Arora Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/extents.c | 5 +++++ 1 file changed, 5 insertions(+) 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; -- 2.34.1