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Avoid reading past buffer when calling GETACL 

Bug noticed in commit
bf118a342f

When calling GETACL, if the size of the bitmap array, the length
attribute and the acl returned by the server is greater than the
allocated buffer(args.acl_len), we can Oops with a General Protection
fault at _copy_from_pages() when we attempt to read past the pages
allocated.

This patch allocates an extra PAGE for the bitmap and checks to see that
the bitmap + attribute_length + ACLs don't exceed the buffer space
allocated to it.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reported-by: Jian Li <jiali@redhat.com>
[Trond: Fixed a size_t vs unsigned int printk() warning]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Sachin Prabhu 2012-04-17 14:35:39 +01:00 committed by Trond Myklebust
parent 10bd295a0b
commit 5a00689930
2 changed files with 21 additions and 13 deletions
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16
fs/nfs/nfs4proc.c
View File

@ -3684,19 +3684,23 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
if (npages == 0)
npages = 1;
/* Add an extra page to handle the bitmap returned */
npages++;
for (i = 0; i < npages; i++) {
pages[i] = alloc_page(GFP_KERNEL);
if (!pages[i])
goto out_free;
}
if (npages > 1) {
/* for decoding across pages */
res.acl_scratch = alloc_page(GFP_KERNEL);
if (!res.acl_scratch)
goto out_free;
}
/* for decoding across pages */
res.acl_scratch = alloc_page(GFP_KERNEL);
if (!res.acl_scratch)
goto out_free;
args.acl_len = npages * PAGE_SIZE;
args.acl_pgbase = 0;
/* Let decode_getfacl know not to fail if the ACL data is larger than
* the page we send as a guess */
if (buf == NULL)

18
fs/nfs/nfs4xdr.c
View File

@ -4902,11 +4902,19 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
bitmap[3] = {0};
struct kvec *iov = req->rq_rcv_buf.head;
int status;
size_t page_len = xdr->buf->page_len;
res->acl_len = 0;
if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
goto out;
bm_p = xdr->p;
res->acl_data_offset = be32_to_cpup(bm_p) + 2;
res->acl_data_offset <<= 2;
/* Check if the acl data starts beyond the allocated buffer */
if (res->acl_data_offset > page_len)
return -ERANGE;
if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
goto out;
if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
@ -4916,28 +4924,24 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
return -EIO;
if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
size_t hdrlen;
u32 recvd;
/* The bitmap (xdr len + bitmaps) and the attr xdr len words
* are stored with the acl data to handle the problem of
* variable length bitmaps.*/
xdr->p = bm_p;
res->acl_data_offset = be32_to_cpup(bm_p) + 2;
res->acl_data_offset <<= 2;
/* We ignore &savep and don't do consistency checks on
* the attr length. Let userspace figure it out.... */
hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
attrlen += res->acl_data_offset;
recvd = req->rq_rcv_buf.len - hdrlen;
if (attrlen > recvd) {
if (attrlen > page_len) {
if (res->acl_flags & NFS4_ACL_LEN_REQUEST) {
/* getxattr interface called with a NULL buf */
res->acl_len = attrlen;
goto out;
}
dprintk("NFS: acl reply: attrlen %u > recvd %u\n",
attrlen, recvd);
dprintk("NFS: acl reply: attrlen %zu > page_len %u\n",
attrlen, page_len);
return -EINVAL;
}
xdr_read_pages(xdr, attrlen);