1// SPDX-License-Identifier: GPL-2.0
  2
  3#include <linux/syscalls.h>
  4#include <linux/compat.h>
  5#include <linux/quotaops.h>
  6
  7/*
  8 * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
  9 * and is necessary due to alignment problems.
 10 */
 11struct compat_if_dqblk {
 12	compat_u64 dqb_bhardlimit;
 13	compat_u64 dqb_bsoftlimit;
 14	compat_u64 dqb_curspace;
 15	compat_u64 dqb_ihardlimit;
 16	compat_u64 dqb_isoftlimit;
 17	compat_u64 dqb_curinodes;
 18	compat_u64 dqb_btime;
 19	compat_u64 dqb_itime;
 20	compat_uint_t dqb_valid;
 21};
 22
 23/* XFS structures */
 24struct compat_fs_qfilestat {
 25	compat_u64 dqb_bhardlimit;
 26	compat_u64 qfs_nblks;
 27	compat_uint_t qfs_nextents;
 28};
 29
 30struct compat_fs_quota_stat {
 31	__s8		qs_version;
 32	__u16		qs_flags;
 33	__s8		qs_pad;
 34	struct compat_fs_qfilestat	qs_uquota;
 35	struct compat_fs_qfilestat	qs_gquota;
 36	compat_uint_t	qs_incoredqs;
 37	compat_int_t	qs_btimelimit;
 38	compat_int_t	qs_itimelimit;
 39	compat_int_t	qs_rtbtimelimit;
 40	__u16		qs_bwarnlimit;
 41	__u16		qs_iwarnlimit;
 42};
 43
 44COMPAT_SYSCALL_DEFINE4(quotactl32, unsigned int, cmd,
 45		       const char __user *, special, qid_t, id,
 46		       void __user *, addr)
 47{
 48	unsigned int cmds;
 49	struct if_dqblk __user *dqblk;
 50	struct compat_if_dqblk __user *compat_dqblk;
 51	struct fs_quota_stat __user *fsqstat;
 52	struct compat_fs_quota_stat __user *compat_fsqstat;
 53	compat_uint_t data;
 54	u16 xdata;
 55	long ret;
 56
 57	cmds = cmd >> SUBCMDSHIFT;
 58
 59	switch (cmds) {
 60	case Q_GETQUOTA:
 61		dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
 62		compat_dqblk = addr;
 63		ret = kernel_quotactl(cmd, special, id, dqblk);
 64		if (ret)
 65			break;
 66		if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
 67			get_user(data, &dqblk->dqb_valid) ||
 68			put_user(data, &compat_dqblk->dqb_valid))
 69			ret = -EFAULT;
 70		break;
 71	case Q_SETQUOTA:
 72		dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
 73		compat_dqblk = addr;
 74		ret = -EFAULT;
 75		if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
 76			get_user(data, &compat_dqblk->dqb_valid) ||
 77			put_user(data, &dqblk->dqb_valid))
 78			break;
 79		ret = kernel_quotactl(cmd, special, id, dqblk);
 80		break;
 81	case Q_XGETQSTAT:
 82		fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
 83		compat_fsqstat = addr;
 84		ret = kernel_quotactl(cmd, special, id, fsqstat);
 85		if (ret)
 86			break;
 87		ret = -EFAULT;
 88		/* Copying qs_version, qs_flags, qs_pad */
 89		if (copy_in_user(compat_fsqstat, fsqstat,
 90			offsetof(struct compat_fs_quota_stat, qs_uquota)))
 91			break;
 92		/* Copying qs_uquota */
 93		if (copy_in_user(&compat_fsqstat->qs_uquota,
 94			&fsqstat->qs_uquota,
 95			sizeof(compat_fsqstat->qs_uquota)) ||
 96			get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
 97			put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
 98			break;
 99		/* Copying qs_gquota */
100		if (copy_in_user(&compat_fsqstat->qs_gquota,
101			&fsqstat->qs_gquota,
102			sizeof(compat_fsqstat->qs_gquota)) ||
103			get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
104			put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
105			break;
106		/* Copying the rest */
107		if (copy_in_user(&compat_fsqstat->qs_incoredqs,
108			&fsqstat->qs_incoredqs,
109			sizeof(struct compat_fs_quota_stat) -
110			offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
111			get_user(xdata, &fsqstat->qs_iwarnlimit) ||
112			put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
113			break;
114		ret = 0;
115		break;
116	default:
117		ret = kernel_quotactl(cmd, special, id, addr);
118	}
119	return ret;
120}