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28// SPDX-License-Identifier: GPL-2.0
/*
 *	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/cap#ifndef __HDLC_IOCTL_H__
#define __HDLC_IOCTL_H__

typedef struct { 
	unsigned int clock_rate; /* bits per second */
	unsigned int clock_type; /* internal, external, TX-internal etc. */
	unsigned short loopback;
} sync_serial_settings;          /* V.35, V.24, X.21 */

typedef struct { 
	unsigned int clock_rate; /* bits per second */
	unsigned int clock_type; /* internal, external, TX-internal etc. */
	unsigned short loopback;
	unsigned int slot_map;
} te1_settings;                  /* T1, E1 */

typedef struct {
	unsigned short encoding;
	unsigned short parity;
} raw_hdlc_proto;

typedef struct {
	unsigned int t391;
	unsigned int t392;
	unsigned int n391;
	unsigned int n392;
	unsigned int n393;
	unsigned short lmi;
	unsigned short dce; /* 1 for DCE (network side) operation */
} fr_proto;

typedef struct {
	unsigned int dlci;
} fr_proto_pvc;          /* for creating/deleting FR PVCs */

typedef struct {
	unsigned int dlci;
	char master[IFNAMSIZ];	/* Name of master FRAD device */
}fr_proto_pvc_info;		/* for returning PVC information only */

typedef struct {
    unsigned int interval;
    unsigned int timeout;
} cisco_proto;

/* PPP doesn't need any info now - supply length = 0 to ioctl */

#endif /* __HDLC_IOCTL_H__ */
l opt">) { 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_info->gid[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_info->gid[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; } groups_sort(group_info); 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())); }