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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222// 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/capability.h>#include <linux/init.h>#include <linux/highuid.h>#include <linux/security.h>#include <linux/cred.h>#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include "uid16.h"
SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group){ return ksys_chown(filename, low2highuid(user), low2highgid(group));}
SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group){ return ksys_lchown(filename, low2highuid(user), low2highgid(group));}
SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group){ return ksys_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_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()));}