Initial import

1 files changed, 217 insertions, 0 deletions

diff --git a/kernel/uid16.c b/kernel/uid16.c
new file mode 100644
index 000000000..d58cc4d8f
--- /dev/null
+++ b/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()));
+}