From 97fc8b1ebf6a0fe4bb9c71a8e91a822c22c09bc5 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 29 Jan 2013 17:07:42 -0800 Subject: [PATCH] 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 Cc: Ron Minnich Cc: Latchesar Ionkov Signed-off-by: "Eric W. Biederman" --- net/9p/protocol.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/net/9p/protocol.c b/net/9p/protocol.c index 3d33ecf13327..c289c6cee98e 100644 --- a/net/9p/protocol.c +++ b/net/9p/protocol.c @@ -85,6 +85,8 @@ pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size) 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 @@ p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, (*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 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, 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 *);