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quota: do not allow setting of quota limits to too high values

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We should check whether quota limits set via Q_SETQUOTA are not exceeding
limits which quota format is able to handle.

Signed-off-by: Andrew Perepechko <andrew.perepechko@sun.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Perepechko 2008-04-28 02:14:31 -07:00 committed by Linus Torvalds
parent 3b0cb4caef
commit 338bf9afda
4 changed files with 25 additions and 5 deletions
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22
fs/dquot.c
View File

@ -1709,10 +1709,19 @@ int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *d
}
/* Generic routine for setting common part of quota structure */
static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
{
struct mem_dqblk *dm = &dquot->dq_dqb;
int check_blim = 0, check_ilim = 0;
struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
if ((di->dqb_valid & QIF_BLIMITS &&
(di->dqb_bhardlimit > dqi->dqi_maxblimit ||
di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
(di->dqb_valid & QIF_ILIMITS &&
(di->dqb_ihardlimit > dqi->dqi_maxilimit ||
di->dqb_isoftlimit > dqi->dqi_maxilimit)))
return -ERANGE;
spin_lock(&dq_data_lock);
if (di->dqb_valid & QIF_SPACE) {
@ -1744,7 +1753,7 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}
else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
dm->dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
}
if (check_ilim) {
if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
@ -1752,7 +1761,7 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
clear_bit(DQ_INODES_B, &dquot->dq_flags);
}
else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
dm->dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
}
if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
clear_bit(DQ_FAKE_B, &dquot->dq_flags);
@ -1760,21 +1769,24 @@ static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
set_bit(DQ_FAKE_B, &dquot->dq_flags);
spin_unlock(&dq_data_lock);
mark_dquot_dirty(dquot);
return 0;
}
int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
{
struct dquot *dquot;
int rc;
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
if (!(dquot = dqget(sb, id, type))) {
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return -ESRCH;
}
do_set_dqblk(dquot, di);
rc = do_set_dqblk(dquot, di);
dqput(dquot);
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return 0;
return rc;
}
/* Generic routine for getting common part of quota file information */

3
fs/quota_v1.c
View File

@ -139,6 +139,9 @@ static int v1_read_file_info(struct super_block *sb, int type)
goto out;
}
ret = 0;
/* limits are stored as unsigned 32-bit data */
dqopt->info[type].dqi_maxblimit = 0xffffffff;
dqopt->info[type].dqi_maxilimit = 0xffffffff;
dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
out:

3
fs/quota_v2.c
View File

@ -59,6 +59,9 @@ static int v2_read_file_info(struct super_block *sb, int type)
sb->s_id);
return -1;
}
/* limits are stored as unsigned 32-bit data */
info->dqi_maxblimit = 0xffffffff;
info->dqi_maxilimit = 0xffffffff;
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);

2
include/linux/quota.h
View File

@ -206,6 +206,8 @@ struct mem_dqinfo {
unsigned long dqi_flags;
unsigned int dqi_bgrace;
unsigned int dqi_igrace;
qsize_t dqi_maxblimit;
qsize_t dqi_maxilimit;
union {
struct v1_mem_dqinfo v1_i;
struct v2_mem_dqinfo v2_i;