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authorEric W. Biederman <ebiederm@xmission.com>2012-02-07 16:54:11 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-09-06 22:17:20 -0700
commit1efdb69b0bb41dec8ee3e2cac0a0f167837d0919 (patch)
treea9eb64c44d773e7b4fead20a7bfa9a354abf3bfa /ipc/util.c
parent9582d90196aa879e6acf866f02a1adead08707b5 (diff)
downloadlinux-1efdb69b0bb41dec8ee3e2cac0a0f167837d0919.tar.gz
userns: Convert ipc to use kuid and kgid where appropriate
- Store the ipc owner and creator with a kuid - Store the ipc group and the crators group with a kgid. - Add error handling to ipc_update_perms, allowing it to fail if the uids and gids can not be converted to kuids or kgids. - Modify the proc files to display the ipc creator and owner in the user namespace of the opener of the proc file. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'ipc/util.c')
-rw-r--r--ipc/util.c35
1 files changed, 21 insertions, 14 deletions
diff --git a/ipc/util.c b/ipc/util.c
index eb07fd356f27..72fd0785ac94 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -249,8 +249,8 @@ int ipc_get_maxid(struct ipc_ids *ids)
int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
{
- uid_t euid;
- gid_t egid;
+ kuid_t euid;
+ kgid_t egid;
int id, err;
if (size > IPCMNI)
@@ -606,14 +606,14 @@ void ipc_rcu_putref(void *ptr)
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
{
- uid_t euid = current_euid();
+ kuid_t euid = current_euid();
int requested_mode, granted_mode;
audit_ipc_obj(ipcp);
requested_mode = (flag >> 6) | (flag >> 3) | flag;
granted_mode = ipcp->mode;
- if (euid == ipcp->cuid ||
- euid == ipcp->uid)
+ if (uid_eq(euid, ipcp->cuid) ||
+ uid_eq(euid, ipcp->uid))
granted_mode >>= 6;
else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
granted_mode >>= 3;
@@ -643,10 +643,10 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out)
{
out->key = in->key;
- out->uid = in->uid;
- out->gid = in->gid;
- out->cuid = in->cuid;
- out->cgid = in->cgid;
+ out->uid = from_kuid_munged(current_user_ns(), in->uid);
+ out->gid = from_kgid_munged(current_user_ns(), in->gid);
+ out->cuid = from_kuid_munged(current_user_ns(), in->cuid);
+ out->cgid = from_kgid_munged(current_user_ns(), in->cgid);
out->mode = in->mode;
out->seq = in->seq;
}
@@ -747,12 +747,19 @@ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
* @in: the permission given as input.
* @out: the permission of the ipc to set.
*/
-void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
+int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
{
- out->uid = in->uid;
- out->gid = in->gid;
+ kuid_t uid = make_kuid(current_user_ns(), in->uid);
+ kgid_t gid = make_kgid(current_user_ns(), in->gid);
+ if (!uid_valid(uid) || !gid_valid(gid))
+ return -EINVAL;
+
+ out->uid = uid;
+ out->gid = gid;
out->mode = (out->mode & ~S_IRWXUGO)
| (in->mode & S_IRWXUGO);
+
+ return 0;
}
/**
@@ -777,7 +784,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns,
struct ipc64_perm *perm, int extra_perm)
{
struct kern_ipc_perm *ipcp;
- uid_t euid;
+ kuid_t euid;
int err;
down_write(&ids->rw_mutex);
@@ -793,7 +800,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns,
perm->gid, perm->mode);
euid = current_euid();
- if (euid == ipcp->cuid || euid == ipcp->uid ||
+ if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid) ||
ns_capable(ns->user_ns, CAP_SYS_ADMIN))
return ipcp;