diff options
author | Kees Cook <keescook@chromium.org> | 2022-10-16 21:36:50 -0700 |
---|---|---|
committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2022-10-27 15:52:10 -0400 |
commit | cf0d7e7f4520814f45e1313872ad5777ed504004 (patch) | |
tree | e5bdb30c9297ff31dcd7ea93925008864763d8d2 /fs/nfs/nfs4proc.c | |
parent | 121affdf8a940555ceef6ab10a709030e52a4f91 (diff) | |
download | lwn-cf0d7e7f4520814f45e1313872ad5777ed504004.tar.gz lwn-cf0d7e7f4520814f45e1313872ad5777ed504004.zip |
NFS: Avoid memcpy() run-time warning for struct sockaddr overflows
The 'nfs_server' and 'mount_server' structures include a union of
'struct sockaddr' (with the older 16 bytes max address size) and
'struct sockaddr_storage' which is large enough to hold all the
supported sa_family types (128 bytes max size). The runtime memcpy()
buffer overflow checker is seeing attempts to write beyond the 16
bytes as an overflow, but the actual expected size is that of 'struct
sockaddr_storage'. Plumb the use of 'struct sockaddr_storage' more
completely through-out NFS, which results in adjusting the memcpy()
buffers to the correct union members. Avoids this false positive run-time
warning under CONFIG_FORTIFY_SOURCE:
memcpy: detected field-spanning write (size 28) of single field "&ctx->nfs_server.address" at fs/nfs/namespace.c:178 (size 16)
Reported-by: kernel test robot <yujie.liu@intel.com>
Link: https://lore.kernel.org/all/202210110948.26b43120-yujie.liu@intel.com
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: linux-nfs@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
-rw-r--r-- | fs/nfs/nfs4proc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index e2efcd26336c..4c4df7f213b6 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3951,7 +3951,7 @@ static void test_fs_location_for_trunking(struct nfs4_fs_location *location, for (i = 0; i < location->nservers; i++) { struct nfs4_string *srv_loc = &location->servers[i]; - struct sockaddr addr; + struct sockaddr_storage addr; size_t addrlen; struct xprt_create xprt_args = { .ident = 0, @@ -3974,7 +3974,7 @@ static void test_fs_location_for_trunking(struct nfs4_fs_location *location, clp->cl_net, server->port); if (!addrlen) return; - xprt_args.dstaddr = &addr; + xprt_args.dstaddr = (struct sockaddr *)&addr; xprt_args.addrlen = addrlen; servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); if (!servername) |