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fs/quota/compat.c
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81f7e3824 Initial Release, ... |
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// SPDX-License-Identifier: GPL-2.0 #include <linux/syscalls.h> #include <linux/compat.h> #include <linux/quotaops.h> /* * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64) * and is necessary due to alignment problems. */ struct compat_if_dqblk { compat_u64 dqb_bhardlimit; compat_u64 dqb_bsoftlimit; compat_u64 dqb_curspace; compat_u64 dqb_ihardlimit; compat_u64 dqb_isoftlimit; compat_u64 dqb_curinodes; compat_u64 dqb_btime; compat_u64 dqb_itime; compat_uint_t dqb_valid; }; /* XFS structures */ struct compat_fs_qfilestat { compat_u64 dqb_bhardlimit; compat_u64 qfs_nblks; compat_uint_t qfs_nextents; }; struct compat_fs_quota_stat { __s8 qs_version; __u16 qs_flags; __s8 qs_pad; struct compat_fs_qfilestat qs_uquota; struct compat_fs_qfilestat qs_gquota; compat_uint_t qs_incoredqs; compat_int_t qs_btimelimit; compat_int_t qs_itimelimit; compat_int_t qs_rtbtimelimit; __u16 qs_bwarnlimit; __u16 qs_iwarnlimit; }; asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special, qid_t id, void __user *addr) { unsigned int cmds; struct if_dqblk __user *dqblk; struct compat_if_dqblk __user *compat_dqblk; struct fs_quota_stat __user *fsqstat; struct compat_fs_quota_stat __user *compat_fsqstat; compat_uint_t data; u16 xdata; long ret; cmds = cmd >> SUBCMDSHIFT; switch (cmds) { case Q_GETQUOTA: dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); compat_dqblk = addr; ret = sys_quotactl(cmd, special, id, dqblk); if (ret) break; if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) || get_user(data, &dqblk->dqb_valid) || put_user(data, &compat_dqblk->dqb_valid)) ret = -EFAULT; break; case Q_SETQUOTA: dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); compat_dqblk = addr; ret = -EFAULT; if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) || get_user(data, &compat_dqblk->dqb_valid) || put_user(data, &dqblk->dqb_valid)) break; ret = sys_quotactl(cmd, special, id, dqblk); break; case Q_XGETQSTAT: fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat)); compat_fsqstat = addr; ret = sys_quotactl(cmd, special, id, fsqstat); if (ret) break; ret = -EFAULT; /* Copying qs_version, qs_flags, qs_pad */ if (copy_in_user(compat_fsqstat, fsqstat, offsetof(struct compat_fs_quota_stat, qs_uquota))) break; /* Copying qs_uquota */ if (copy_in_user(&compat_fsqstat->qs_uquota, &fsqstat->qs_uquota, sizeof(compat_fsqstat->qs_uquota)) || get_user(data, &fsqstat->qs_uquota.qfs_nextents) || put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents)) break; /* Copying qs_gquota */ if (copy_in_user(&compat_fsqstat->qs_gquota, &fsqstat->qs_gquota, sizeof(compat_fsqstat->qs_gquota)) || get_user(data, &fsqstat->qs_gquota.qfs_nextents) || put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents)) break; /* Copying the rest */ if (copy_in_user(&compat_fsqstat->qs_incoredqs, &fsqstat->qs_incoredqs, sizeof(struct compat_fs_quota_stat) - offsetof(struct compat_fs_quota_stat, qs_incoredqs)) || get_user(xdata, &fsqstat->qs_iwarnlimit) || put_user(xdata, &compat_fsqstat->qs_iwarnlimit)) break; ret = 0; break; default: ret = sys_quotactl(cmd, special, id, addr); } return ret; } |