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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-08-26 11:44:43 -0700
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-09-06 11:11:53 -0400
commit1f1ea6c2d9d8c0be9ec56454b05315273b5de8ce (patch)
tree4718cdc2e494f18ab13c2c8f09930953b77c31ff /include
parent21f498c2f73bd6150d82931f09965826dca0b5f2 (diff)
downloadlinux-1f1ea6c2d9d8c0be9ec56454b05315273b5de8ce.tar.bz2
NFSv4: Fix buffer overflow checking in __nfs4_get_acl_uncached
Pass the checks made by decode_getacl back to __nfs4_get_acl_uncached so that it knows if the acl has been truncated. The current overflow checking is broken, resulting in Oopses on user-triggered nfs4_getfacl calls, and is opaque to the point where several attempts at fixing it have failed. This patch tries to clean up the code in addition to fixing the Oopses by ensuring that the overflow checks are performed in a single place (decode_getacl). If the overflow check failed, we will still be able to report the acl length, but at least we will no longer attempt to cache the acl or copy the truncated contents to user space. Reported-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by: Sachin Prabhu <sprabhu@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nfs_xdr.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index ac7c8ae254f2..be9cf3c7e79e 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -652,7 +652,7 @@ struct nfs_getaclargs {
};
/* getxattr ACL interface flags */
-#define NFS4_ACL_LEN_REQUEST 0x0001 /* zero length getxattr buffer */
+#define NFS4_ACL_TRUNC 0x0001 /* ACL was truncated */
struct nfs_getaclres {
size_t acl_len;
size_t acl_data_offset;