^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Wrapper functions for 16bit uid back compatibility. All nicely tied
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * together in the faint hope we can take the out in five years time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/prctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/highuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "uid16.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return ksys_chown(filename, low2highuid(user), low2highgid(group));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return ksys_lchown(filename, low2highuid(user), low2highgid(group));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return ksys_fchown(fd, low2highuid(user), low2highgid(group));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return __sys_setregid(low2highgid(rgid), low2highgid(egid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return __sys_setgid(low2highgid(gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return __sys_setreuid(low2highuid(ruid), low2highuid(euid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return __sys_setuid(low2highuid(uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return __sys_setresuid(low2highuid(ruid), low2highuid(euid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) low2highuid(suid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) const struct cred *cred = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) old_uid_t ruid, euid, suid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!(retval = put_user(ruid, ruidp)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) !(retval = put_user(euid, euidp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) retval = put_user(suid, suidp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return __sys_setresgid(low2highgid(rgid), low2highgid(egid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) low2highgid(sgid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) const struct cred *cred = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) old_gid_t rgid, egid, sgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!(retval = put_user(rgid, rgidp)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) !(retval = put_user(egid, egidp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) retval = put_user(sgid, sgidp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return __sys_setfsuid(low2highuid(uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return __sys_setfsgid(low2highgid(gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int groups16_to_user(old_gid_t __user *grouplist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct group_info *group_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct user_namespace *user_ns = current_user_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) old_gid_t group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) kgid_t kgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) for (i = 0; i < group_info->ngroups; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) kgid = group_info->gid[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) group = high2lowgid(from_kgid_munged(user_ns, kgid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (put_user(group, grouplist+i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int groups16_from_user(struct group_info *group_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) old_gid_t __user *grouplist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct user_namespace *user_ns = current_user_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) old_gid_t group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) kgid_t kgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) for (i = 0; i < group_info->ngroups; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (get_user(group, grouplist+i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) kgid = make_kgid(user_ns, low2highgid(group));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (!gid_valid(kgid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) group_info->gid[i] = kgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) const struct cred *cred = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (gidsetsize < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) i = cred->group_info->ngroups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (gidsetsize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (i > gidsetsize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) i = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (groups16_to_user(grouplist, cred->group_info)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) i = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct group_info *group_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!may_setgroups())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if ((unsigned)gidsetsize > NGROUPS_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) group_info = groups_alloc(gidsetsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (!group_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) retval = groups16_from_user(group_info, grouplist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) put_group_info(group_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) groups_sort(group_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) retval = set_current_groups(group_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) put_group_info(group_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) SYSCALL_DEFINE0(getuid16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) SYSCALL_DEFINE0(geteuid16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) SYSCALL_DEFINE0(getgid16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) SYSCALL_DEFINE0(getegid16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags