On Tue, 5 Dec 2000, Linus Torvalds wrote:
>
> Ok, I almost called this the final test12, but I wanted to get some more
> feedback on the keyboard controller stuff and PCI irq routing.
Linus, could you apply the following bunch of fixes (split into separate
emails):
* dentry leak upon the attempt of cross-device link().
* recovery after get_block() failure in block_prepare_write()
* ext2_update_inode() missing some cases when it should mark
* bogus return values of truncate() and ftruncate().
fs as having large files
* fix to ext2_get_block() - it should return -EFBIG if the block
number is too large, not -EIO.
All of these are real bugs and the first 3 are pretty bad.
The first one (not my catch) - sys_link() should do path_release() if
it decides to fail with -EXDEV. It doesn't. Result: exploitable dentry
leak. Please, apply.
diff -urN rc12-pre6/fs/namei.c rc12-pre6-link/fs/namei.c
--- rc12-pre6/fs/namei.c Tue Dec 5 02:03:15 2000
+++ rc12-pre6-link/fs/namei.c Tue Dec 5 14:55:57 2000
@@ -1611,7 +1611,7 @@
goto out;
error = -EXDEV;
if (old_nd.mnt != nd.mnt)
- goto out;
+ goto out2;
new_dentry = lookup_create(&nd, 0);
error = PTR_ERR(new_dentry);
if (!IS_ERR(new_dentry)) {
@@ -1619,6 +1619,7 @@
dput(new_dentry);
}
up(&nd.dentry->d_inode->i_sem);
+out2:
path_release(&nd);
out:
path_release(&old_nd);
-
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