9p: Add 'u' and 'g' format specifies for kuids and kgids
This allows concentrating all of the conversion to and from kuids and
kgids into the format needed by the 9p protocol into one location.
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 3d33ecf..c289c6c 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -85,6 +85,8 @@
d - int32_t
q - int64_t
s - string
+ u - numeric uid
+ g - numeric gid
S - stat
Q - qid
D - data blob (int32_t size followed by void *, results are not freed)
@@ -163,6 +165,26 @@
(*sptr)[len] = 0;
}
break;
+ case 'u': {
+ kuid_t *uid = va_arg(ap, kuid_t *);
+ __le32 le_val;
+ if (pdu_read(pdu, &le_val, sizeof(le_val))) {
+ errcode = -EFAULT;
+ break;
+ }
+ *uid = make_kuid(&init_user_ns,
+ le32_to_cpu(le_val));
+ } break;
+ case 'g': {
+ kgid_t *gid = va_arg(ap, kgid_t *);
+ __le32 le_val;
+ if (pdu_read(pdu, &le_val, sizeof(le_val))) {
+ errcode = -EFAULT;
+ break;
+ }
+ *gid = make_kgid(&init_user_ns,
+ le32_to_cpu(le_val));
+ } break;
case 'Q':{
struct p9_qid *qid =
va_arg(ap, struct p9_qid *);
@@ -377,6 +399,20 @@
errcode = -EFAULT;
}
break;
+ case 'u': {
+ kuid_t uid = va_arg(ap, kuid_t);
+ __le32 val = cpu_to_le32(
+ from_kuid(&init_user_ns, uid));
+ if (pdu_write(pdu, &val, sizeof(val)))
+ errcode = -EFAULT;
+ } break;
+ case 'g': {
+ kgid_t gid = va_arg(ap, kgid_t);
+ __le32 val = cpu_to_le32(
+ from_kgid(&init_user_ns, gid));
+ if (pdu_write(pdu, &val, sizeof(val)))
+ errcode = -EFAULT;
+ } break;
case 'Q':{
const struct p9_qid *qid =
va_arg(ap, const struct p9_qid *);