Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / uid16.c

diff --git a/kernel/kernel/uid16.c b/kernel/kernel/uid16.c
new file mode 100644 (file)
index 0000000..d58cc4d
--- /dev/null
+++ b/kernel/kernel/uid16.c
@@ -0,0 +1,217 @@
+/*
+ *     Wrapper functions for 16bit uid back compatibility. All nicely tied
+ *     together in the faint hope we can take the out in five years time.
+ */
+
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/prctl.h>
+#include <linux/capability.h>
+#include <linux/init.h>
+#include <linux/highuid.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+
+#include <asm/uaccess.h>
+
+SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
+{
+       return sys_chown(filename, low2highuid(user), low2highgid(group));
+}
+
+SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
+{
+       return sys_lchown(filename, low2highuid(user), low2highgid(group));
+}
+
+SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
+{
+       return sys_fchown(fd, low2highuid(user), low2highgid(group));
+}
+
+SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
+{
+       return sys_setregid(low2highgid(rgid), low2highgid(egid));
+}
+
+SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
+{
+       return sys_setgid(low2highgid(gid));
+}
+
+SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
+{
+       return sys_setreuid(low2highuid(ruid), low2highuid(euid));
+}
+
+SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
+{
+       return sys_setuid(low2highuid(uid));
+}
+
+SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
+{
+       return sys_setresuid(low2highuid(ruid), low2highuid(euid),
+                                low2highuid(suid));
+}
+
+SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
+{
+       const struct cred *cred = current_cred();
+       int retval;
+       old_uid_t ruid, euid, suid;
+
+       ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
+       euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
+       suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
+
+       if (!(retval   = put_user(ruid, ruidp)) &&
+           !(retval   = put_user(euid, euidp)))
+               retval = put_user(suid, suidp);
+
+       return retval;
+}
+
+SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
+{
+       return sys_setresgid(low2highgid(rgid), low2highgid(egid),
+                                low2highgid(sgid));
+}
+
+
+SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
+{
+       const struct cred *cred = current_cred();
+       int retval;
+       old_gid_t rgid, egid, sgid;
+
+       rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
+       egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
+       sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
+
+       if (!(retval   = put_user(rgid, rgidp)) &&
+           !(retval   = put_user(egid, egidp)))
+               retval = put_user(sgid, sgidp);
+
+       return retval;
+}
+
+SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
+{
+       return sys_setfsuid(low2highuid(uid));
+}
+
+SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
+{
+       return sys_setfsgid(low2highgid(gid));
+}
+
+static int groups16_to_user(old_gid_t __user *grouplist,
+    struct group_info *group_info)
+{
+       struct user_namespace *user_ns = current_user_ns();
+       int i;
+       old_gid_t group;
+       kgid_t kgid;
+
+       for (i = 0; i < group_info->ngroups; i++) {
+               kgid = GROUP_AT(group_info, i);
+               group = high2lowgid(from_kgid_munged(user_ns, kgid));
+               if (put_user(group, grouplist+i))
+                       return -EFAULT;
+       }
+
+       return 0;
+}
+
+static int groups16_from_user(struct group_info *group_info,
+    old_gid_t __user *grouplist)
+{
+       struct user_namespace *user_ns = current_user_ns();
+       int i;
+       old_gid_t group;
+       kgid_t kgid;
+
+       for (i = 0; i < group_info->ngroups; i++) {
+               if (get_user(group, grouplist+i))
+                       return  -EFAULT;
+
+               kgid = make_kgid(user_ns, low2highgid(group));
+               if (!gid_valid(kgid))
+                       return -EINVAL;
+
+               GROUP_AT(group_info, i) = kgid;
+       }
+
+       return 0;
+}
+
+SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
+{
+       const struct cred *cred = current_cred();
+       int i;
+
+       if (gidsetsize < 0)
+               return -EINVAL;
+
+       i = cred->group_info->ngroups;
+       if (gidsetsize) {
+               if (i > gidsetsize) {
+                       i = -EINVAL;
+                       goto out;
+               }
+               if (groups16_to_user(grouplist, cred->group_info)) {
+                       i = -EFAULT;
+                       goto out;
+               }
+       }
+out:
+       return i;
+}
+
+SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
+{
+       struct group_info *group_info;
+       int retval;
+
+       if (!may_setgroups())
+               return -EPERM;
+       if ((unsigned)gidsetsize > NGROUPS_MAX)
+               return -EINVAL;
+
+       group_info = groups_alloc(gidsetsize);
+       if (!group_info)
+               return -ENOMEM;
+       retval = groups16_from_user(group_info, grouplist);
+       if (retval) {
+               put_group_info(group_info);
+               return retval;
+       }
+
+       retval = set_current_groups(group_info);
+       put_group_info(group_info);
+
+       return retval;
+}
+
+SYSCALL_DEFINE0(getuid16)
+{
+       return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
+}
+
+SYSCALL_DEFINE0(geteuid16)
+{
+       return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
+}
+
+SYSCALL_DEFINE0(getgid16)
+{
+       return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
+}
+
+SYSCALL_DEFINE0(getegid16)
+{
+       return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
+}