[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/kernel/uid16.c b/ap/os/linux/linux-3.4.x/kernel/uid16.c
new file mode 100644
index 0000000..51c6e89
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/uid16.c
@@ -0,0 +1,230 @@
+/*
+ * 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)
+{
+ long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, filename, user, group);
+ return ret;
+}
+
+SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
+{
+ long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, filename, user, group);
+ return ret;
+}
+
+SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
+{
+ long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, fd, user, group);
+ return ret;
+}
+
+SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
+{
+ long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(2, ret, rgid, egid);
+ return ret;
+}
+
+SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
+{
+ long ret = sys_setgid(low2highgid(gid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(1, ret, gid);
+ return ret;
+}
+
+SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
+{
+ long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(2, ret, ruid, euid);
+ return ret;
+}
+
+SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
+{
+ long ret = sys_setuid(low2highuid(uid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(1, ret, uid);
+ return ret;
+}
+
+SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
+{
+ long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
+ low2highuid(suid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, ruid, euid, suid);
+ return ret;
+}
+
+SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
+{
+ const struct cred *cred = current_cred();
+ int retval;
+
+ if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
+ !(retval = put_user(high2lowuid(cred->euid), euid)))
+ retval = put_user(high2lowuid(cred->suid), suid);
+
+ return retval;
+}
+
+SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
+{
+ long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
+ low2highgid(sgid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, rgid, egid, sgid);
+ return ret;
+}
+
+
+SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
+{
+ const struct cred *cred = current_cred();
+ int retval;
+
+ if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
+ !(retval = put_user(high2lowgid(cred->egid), egid)))
+ retval = put_user(high2lowgid(cred->sgid), sgid);
+
+ return retval;
+}
+
+SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
+{
+ long ret = sys_setfsuid(low2highuid(uid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(1, ret, uid);
+ return ret;
+}
+
+SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
+{
+ long ret = sys_setfsgid(low2highgid(gid));
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(1, ret, gid);
+ return ret;
+}
+
+static int groups16_to_user(old_gid_t __user *grouplist,
+ struct group_info *group_info)
+{
+ int i;
+ old_gid_t group;
+
+ for (i = 0; i < group_info->ngroups; i++) {
+ group = high2lowgid(GROUP_AT(group_info, i));
+ 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)
+{
+ int i;
+ old_gid_t group;
+
+ for (i = 0; i < group_info->ngroups; i++) {
+ if (get_user(group, grouplist+i))
+ return -EFAULT;
+ GROUP_AT(group_info, i) = low2highgid(group);
+ }
+
+ 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 (!nsown_capable(CAP_SETGID))
+ 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(current_uid());
+}
+
+SYSCALL_DEFINE0(geteuid16)
+{
+ return high2lowuid(current_euid());
+}
+
+SYSCALL_DEFINE0(getgid16)
+{
+ return high2lowgid(current_gid());
+}
+
+SYSCALL_DEFINE0(getegid16)
+{
+ return high2lowgid(current_egid());
+}