mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 09:43:59 +08:00
003d7ab479
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
232 lines
5.3 KiB
C
232 lines
5.3 KiB
C
/*
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* Wrapper functions for 16bit uid back compatibility. All nicely tied
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* together in the faint hope we can take the out in five years time.
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*/
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#include <linux/mm.h>
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#include <linux/utsname.h>
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#include <linux/mman.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/prctl.h>
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#include <linux/capability.h>
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#include <linux/init.h>
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#include <linux/highuid.h>
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
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{
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long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(3, ret, filename, user, group);
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return ret;
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}
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SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
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{
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long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(3, ret, filename, user, group);
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return ret;
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}
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SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
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{
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long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(3, ret, fd, user, group);
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return ret;
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}
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SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
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{
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long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(2, ret, rgid, egid);
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return ret;
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}
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SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
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{
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long ret = sys_setgid(low2highgid(gid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(1, ret, gid);
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return ret;
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}
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SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
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{
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long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(2, ret, ruid, euid);
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return ret;
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}
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SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
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{
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long ret = sys_setuid(low2highuid(uid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(1, ret, uid);
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return ret;
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}
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SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
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{
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long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
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low2highuid(suid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(3, ret, ruid, euid, suid);
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return ret;
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}
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SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
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{
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const struct cred *cred = current_cred();
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int retval;
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if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
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!(retval = put_user(high2lowuid(cred->euid), euid)))
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retval = put_user(high2lowuid(cred->suid), suid);
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return retval;
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}
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SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
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{
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long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
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low2highgid(sgid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(3, ret, rgid, egid, sgid);
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return ret;
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}
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SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
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{
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const struct cred *cred = current_cred();
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int retval;
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if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
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!(retval = put_user(high2lowgid(cred->egid), egid)))
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retval = put_user(high2lowgid(cred->sgid), sgid);
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return retval;
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}
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SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
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{
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long ret = sys_setfsuid(low2highuid(uid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(1, ret, uid);
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return ret;
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}
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SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
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{
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long ret = sys_setfsgid(low2highgid(gid));
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/* avoid REGPARM breakage on x86: */
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asmlinkage_protect(1, ret, gid);
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return ret;
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}
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static int groups16_to_user(old_gid_t __user *grouplist,
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struct group_info *group_info)
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{
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int i;
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old_gid_t group;
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for (i = 0; i < group_info->ngroups; i++) {
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group = high2lowgid(GROUP_AT(group_info, i));
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if (put_user(group, grouplist+i))
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return -EFAULT;
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}
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return 0;
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}
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static int groups16_from_user(struct group_info *group_info,
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old_gid_t __user *grouplist)
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{
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int i;
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old_gid_t group;
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for (i = 0; i < group_info->ngroups; i++) {
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if (get_user(group, grouplist+i))
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return -EFAULT;
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GROUP_AT(group_info, i) = low2highgid(group);
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}
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return 0;
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}
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SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
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{
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const struct cred *cred = current_cred();
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int i;
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if (gidsetsize < 0)
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return -EINVAL;
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i = cred->group_info->ngroups;
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if (gidsetsize) {
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if (i > gidsetsize) {
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i = -EINVAL;
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goto out;
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}
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if (groups16_to_user(grouplist, cred->group_info)) {
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i = -EFAULT;
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goto out;
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}
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}
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out:
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return i;
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}
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SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
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{
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struct group_info *group_info;
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int retval;
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if (!capable(CAP_SETGID))
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return -EPERM;
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if ((unsigned)gidsetsize > NGROUPS_MAX)
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return -EINVAL;
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group_info = groups_alloc(gidsetsize);
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if (!group_info)
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return -ENOMEM;
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retval = groups16_from_user(group_info, grouplist);
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if (retval) {
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put_group_info(group_info);
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return retval;
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}
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retval = set_current_groups(group_info);
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put_group_info(group_info);
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return retval;
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}
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SYSCALL_DEFINE0(getuid16)
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{
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return high2lowuid(current_uid());
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}
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SYSCALL_DEFINE0(geteuid16)
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{
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return high2lowuid(current_euid());
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}
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SYSCALL_DEFINE0(getgid16)
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{
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return high2lowgid(current_gid());
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}
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SYSCALL_DEFINE0(getegid16)
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{
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return high2lowgid(current_egid());
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}
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