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 */
11 struct 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 */
24 struct compat_fs_qfilestat {
25 compat_u64 dqb_bhardlimit;
26 compat_u64 qfs_nblks;
27 compat_uint_t qfs_nextents;
28 };
29
30 struct 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
sys32_quotactl(unsigned int cmd,const char __user * special,qid_t id,void __user * addr)44 asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
45 qid_t id, void __user *addr)
46 {
47 unsigned int cmds;
48 struct if_dqblk __user *dqblk;
49 struct compat_if_dqblk __user *compat_dqblk;
50 struct fs_quota_stat __user *fsqstat;
51 struct compat_fs_quota_stat __user *compat_fsqstat;
52 compat_uint_t data;
53 u16 xdata;
54 long ret;
55
56 cmds = cmd >> SUBCMDSHIFT;
57
58 switch (cmds) {
59 case Q_GETQUOTA:
60 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
61 compat_dqblk = addr;
62 ret = sys_quotactl(cmd, special, id, dqblk);
63 if (ret)
64 break;
65 if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
66 get_user(data, &dqblk->dqb_valid) ||
67 put_user(data, &compat_dqblk->dqb_valid))
68 ret = -EFAULT;
69 break;
70 case Q_SETQUOTA:
71 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
72 compat_dqblk = addr;
73 ret = -EFAULT;
74 if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
75 get_user(data, &compat_dqblk->dqb_valid) ||
76 put_user(data, &dqblk->dqb_valid))
77 break;
78 ret = sys_quotactl(cmd, special, id, dqblk);
79 break;
80 case Q_XGETQSTAT:
81 fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
82 compat_fsqstat = addr;
83 ret = sys_quotactl(cmd, special, id, fsqstat);
84 if (ret)
85 break;
86 ret = -EFAULT;
87 /* Copying qs_version, qs_flags, qs_pad */
88 if (copy_in_user(compat_fsqstat, fsqstat,
89 offsetof(struct compat_fs_quota_stat, qs_uquota)))
90 break;
91 /* Copying qs_uquota */
92 if (copy_in_user(&compat_fsqstat->qs_uquota,
93 &fsqstat->qs_uquota,
94 sizeof(compat_fsqstat->qs_uquota)) ||
95 get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
96 put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
97 break;
98 /* Copying qs_gquota */
99 if (copy_in_user(&compat_fsqstat->qs_gquota,
100 &fsqstat->qs_gquota,
101 sizeof(compat_fsqstat->qs_gquota)) ||
102 get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
103 put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
104 break;
105 /* Copying the rest */
106 if (copy_in_user(&compat_fsqstat->qs_incoredqs,
107 &fsqstat->qs_incoredqs,
108 sizeof(struct compat_fs_quota_stat) -
109 offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
110 get_user(xdata, &fsqstat->qs_iwarnlimit) ||
111 put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
112 break;
113 ret = 0;
114 break;
115 default:
116 ret = sys_quotactl(cmd, special, id, addr);
117 }
118 return ret;
119 }
120