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authorNikanth Karthikesan <knikanth@suse.de>2010-05-16 14:00:00 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-05-16 14:00:00 -0400
commit6d19c42b7cf81c39632b6d4dbc514e8449bcd346 (patch)
treef390fca28758e63c8be0530a2c8656ff27f5320b /fs/ext4
parentfbe845ddf368f77f86aa7500f8fd2690f54c66a8 (diff)
downloadblackbird-op-linux-6d19c42b7cf81c39632b6d4dbc514e8449bcd346.tar.gz
blackbird-op-linux-6d19c42b7cf81c39632b6d4dbc514e8449bcd346.zip
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: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Amit Arora <aarora@in.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/extents.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ee611daf0748..8a8f9f0be911 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -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;
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