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authorJ. Bruce Fields <bfields@redhat.com>2014-06-19 16:44:48 -0400
committerJ. Bruce Fields <bfields@redhat.com>2014-06-27 16:10:46 -0400
commit76f47128f9b33af1e96819746550d789054c9664 (patch)
treedca48a1704912dbe125ab45ff020331c1b0f8ddd /fs/nfsd
parenta497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee (diff)
downloadop-kernel-dev-76f47128f9b33af1e96819746550d789054c9664.zip
op-kernel-dev-76f47128f9b33af1e96819746550d789054c9664.tar.gz
nfsd: fix rare symlink decoding bug
An NFS operation that creates a new symlink includes the symlink data, which is xdr-encoded as a length followed by the data plus 0 to 3 bytes of zero-padding as required to reach a 4-byte boundary. The vfs, on the other hand, wants null-terminated data. The simple way to handle this would be by copying the data into a newly allocated buffer with space for the final null. The current nfsd_symlink code tries to be more clever by skipping that step in the (likely) case where the byte following the string is already 0. But that assumes that the byte following the string is ours to look at. In fact, it might be the first byte of a page that we can't read, or of some object that another task might modify. Worse, the NFSv4 code tries to fix the problem by actually writing to that byte. In the NFSv2/v3 cases this actually appears to be safe: - nfs3svc_decode_symlinkargs explicitly null-terminates the data (after first checking its length and copying it to a new page). - NFSv2 limits symlinks to 1k. The buffer holding the rpc request is always at least a page, and the link data (and previous fields) have maximum lengths that prevent the request from reaching the end of a page. In the NFSv4 case the CREATE op is potentially just one part of a long compound so can end up on the end of a page if you're unlucky. The minimal fix here is to copy and null-terminate in the NFSv4 case. The nfsd_symlink() interface here seems too fragile, though. It should really either do the copy itself every time or just require a null-terminated string. Reported-by: Jeff Layton <jlayton@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4proc.c9
-rw-r--r--fs/nfsd/nfs4xdr.c13
2 files changed, 12 insertions, 10 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 6851b00..8f029db 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -617,15 +617,6 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
switch (create->cr_type) {
case NF4LNK:
- /* ugh! we have to null-terminate the linktext, or
- * vfs_symlink() will choke. it is always safe to
- * null-terminate by brute force, since at worst we
- * will overwrite the first byte of the create namelen
- * in the XDR buffer, which has already been extracted
- * during XDR decode.
- */
- create->cr_linkname[create->cr_linklen] = 0;
-
status = nfsd_symlink(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
create->cr_linkname, create->cr_linklen,
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 83baf2b..5b4fef5 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -600,7 +600,18 @@ nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create
READ_BUF(4);
create->cr_linklen = be32_to_cpup(p++);
READ_BUF(create->cr_linklen);
- SAVEMEM(create->cr_linkname, create->cr_linklen);
+ /*
+ * The VFS will want a null-terminated string, and
+ * null-terminating in place isn't safe since this might
+ * end on a page boundary:
+ */
+ create->cr_linkname =
+ kmalloc(create->cr_linklen + 1, GFP_KERNEL);
+ if (!create->cr_linkname)
+ return nfserr_jukebox;
+ memcpy(create->cr_linkname, p, create->cr_linklen);
+ create->cr_linkname[create->cr_linklen] = '\0';
+ defer_free(argp, kfree, create->cr_linkname);
break;
case NF4BLK:
case NF4CHR:
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