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
COMPAT_SYSCALL_DEFINE4(quotactl32,unsigned int,cmd,const char __user *,special,qid_t,id,void __user *,addr)44 COMPAT_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 }
121