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authorJ. Bruce Fields <bfields@redhat.com>2013-08-23 11:17:53 -0400
committerJ. Bruce Fields <bfields@redhat.com>2013-09-06 11:45:57 -0400
commit6a36978e6931e6601be586eb313375335f2cfaa3 (patch)
tree537c869b262ebdcbd97ada7697fa6b05a15735ce /net/sunrpc
parent778e512bb1d3315c6b55832248cd30c566c081d7 (diff)
downloadlinux-6a36978e6931e6601be586eb313375335f2cfaa3.tar.gz
rpc: comment on linux_cred encoding, treat all as unsigned
The encoding of linux creds is a bit confusing. Also: I think in practice it doesn't really matter whether we treat any of these things as signed or unsigned, but unsigned seems more straightforward: uid_t/gid_t are unsigned and it simplifies the ngroups overflow check. Tested-by: Simo Sorce <simo@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/auth_gss/gss_rpc_xdr.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index f5067b2e0a0..3c19c7d4889 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -166,14 +166,15 @@ static int dummy_dec_opt_array(struct xdr_stream *xdr,
return 0;
}
-static int get_s32(struct xdr_stream *xdr, s32 *res)
+static int get_host_u32(struct xdr_stream *xdr, u32 *res)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EINVAL;
- memcpy(res, p, sizeof(s32));
+ /* Contents of linux creds are all host-endian: */
+ memcpy(res, p, sizeof(u32));
return 0;
}
@@ -182,8 +183,9 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
{
u32 length;
__be32 *p;
- s32 tmp;
- int N, i, err;
+ u32 tmp;
+ u32 N;
+ int i, err;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
@@ -195,19 +197,19 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
return -ENOSPC;
/* uid */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
creds->cr_uid = make_kuid(&init_user_ns, tmp);
/* gid */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
creds->cr_gid = make_kgid(&init_user_ns, tmp);
/* number of additional gid's */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
N = tmp;
@@ -220,7 +222,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
/* gid's */
for (i = 0; i < N; i++) {
kgid_t kgid;
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
goto out_free_groups;
err = -EINVAL;