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Release 4.15 kernel/uid16.c

Directory: kernel
// 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>


SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
{
	return sys_chown(filename, low2highuid(user), low2highgid(group));
}


SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
{
	return sys_lchown(filename, low2highuid(user), low2highgid(group));
}


SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
{
	return sys_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; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton6168.54%125.00%
Eric W. Biedermann2325.84%125.00%
Alexey Dobriyan44.49%125.00%
Tomas Olsson11.12%125.00%
Total89100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton6160.40%133.33%
Eric W. Biedermann3635.64%133.33%
Alexey Dobriyan43.96%133.33%
Total101100.00%3100.00%

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())); }

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)35533.68%14.55%
Eric W. Biedermann20919.83%418.18%
Heiko Carstens20219.17%313.64%
Andrew Morton18317.36%29.09%
David Howells434.08%29.09%
Greg Kroah-Hartman181.71%313.64%
Tomas Olsson131.23%14.55%
Al Viro111.04%14.55%
Alexey Dobriyan80.76%14.55%
Thiago Rafael Becker50.47%14.55%
Ingo Molnar30.28%14.55%
Randy Dunlap30.28%14.55%
Linus Torvalds10.09%14.55%
Total1054100.00%22100.00%
Directory: kernel
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