> From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> Date: Tue, 10 Jun 2008 19:39:41 -0400
> NFS: Fix the ftruncate() credential problem
>
> ftruncate() access checking is supposed to be performed at
> open() time,
> just like reads and writes.
>
Thanks, Trond. Is there any chance this patch could be
included in the linux kernel in the near future? For now,
I guess I'll workaround this problem by moving the ftruncate()
to before setuid().
-luoqi
PS: I haven't tried the patch, just browsing through, and I noticed
a typo, pointing out here to save some trouble for anyone who
wants to give it a try (I guess gcc would issue a warning too),
/* Search for an existing open(O_WRITE) file */
- ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
- if (ctx != NULL)
- state = ctx->state;
+ if (sattr->ia_valid && ATTR_FILE) { <=== && should be &
+ ctx = nfs_file_open_context(sattr->ia_file);
+ if (ctx != NULL)
+ state = ctx->state;
+ }
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