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| author | Nikanth Karthikesan <knikanth@suse.de> | 2010-05-16 14:00:00 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-05-16 14:00:00 -0400 |
| commit | 6d19c42b7cf81c39632b6d4dbc514e8449bcd346 (patch) | |
| tree | f390fca28758e63c8be0530a2c8656ff27f5320b | |
| parent | fbe845ddf368f77f86aa7500f8fd2690f54c66a8 (diff) | |
| download | op-kernel-dev-6d19c42b7cf81c39632b6d4dbc514e8449bcd346.zip op-kernel-dev-6d19c42b7cf81c39632b6d4dbc514e8449bcd346.tar.gz | |
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>
| -rw-r--r-- | fs/ext4/extents.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index ee611da..8a8f9f0 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; |
