mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
11c514a99b
Perform basic sanity checks of quota headers to avoid kernel crashes on corrupted quota files. CC: stable@vger.kernel.org Reported-by: syzbot+f816042a7ae2225f25ba@syzkaller.appspotmail.com Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
433 lines
12 KiB
C
433 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* vfsv0 quota IO operations on file
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/dqblk_v2.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/quotaops.h>
|
|
|
|
#include <asm/byteorder.h>
|
|
|
|
#include "quota_tree.h"
|
|
#include "quotaio_v2.h"
|
|
|
|
MODULE_AUTHOR("Jan Kara");
|
|
MODULE_DESCRIPTION("Quota format v2 support");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot);
|
|
static void v2r0_disk2memdqb(struct dquot *dquot, void *dp);
|
|
static int v2r0_is_id(void *dp, struct dquot *dquot);
|
|
static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot);
|
|
static void v2r1_disk2memdqb(struct dquot *dquot, void *dp);
|
|
static int v2r1_is_id(void *dp, struct dquot *dquot);
|
|
|
|
static const struct qtree_fmt_operations v2r0_qtree_ops = {
|
|
.mem2disk_dqblk = v2r0_mem2diskdqb,
|
|
.disk2mem_dqblk = v2r0_disk2memdqb,
|
|
.is_id = v2r0_is_id,
|
|
};
|
|
|
|
static const struct qtree_fmt_operations v2r1_qtree_ops = {
|
|
.mem2disk_dqblk = v2r1_mem2diskdqb,
|
|
.disk2mem_dqblk = v2r1_disk2memdqb,
|
|
.is_id = v2r1_is_id,
|
|
};
|
|
|
|
#define QUOTABLOCK_BITS 10
|
|
#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
|
|
|
|
static inline qsize_t v2_stoqb(qsize_t space)
|
|
{
|
|
return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
|
|
}
|
|
|
|
static inline qsize_t v2_qbtos(qsize_t blocks)
|
|
{
|
|
return blocks << QUOTABLOCK_BITS;
|
|
}
|
|
|
|
static int v2_read_header(struct super_block *sb, int type,
|
|
struct v2_disk_dqheader *dqhead)
|
|
{
|
|
ssize_t size;
|
|
|
|
size = sb->s_op->quota_read(sb, type, (char *)dqhead,
|
|
sizeof(struct v2_disk_dqheader), 0);
|
|
if (size != sizeof(struct v2_disk_dqheader)) {
|
|
quota_error(sb, "Failed header read: expected=%zd got=%zd",
|
|
sizeof(struct v2_disk_dqheader), size);
|
|
if (size < 0)
|
|
return size;
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check whether given file is really vfsv0 quotafile */
|
|
static int v2_check_quota_file(struct super_block *sb, int type)
|
|
{
|
|
struct v2_disk_dqheader dqhead;
|
|
static const uint quota_magics[] = V2_INITQMAGICS;
|
|
static const uint quota_versions[] = V2_INITQVERSIONS;
|
|
|
|
if (v2_read_header(sb, type, &dqhead))
|
|
return 0;
|
|
if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
|
|
le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Read information header from quota file */
|
|
static int v2_read_file_info(struct super_block *sb, int type)
|
|
{
|
|
struct v2_disk_dqinfo dinfo;
|
|
struct v2_disk_dqheader dqhead;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
struct mem_dqinfo *info = &dqopt->info[type];
|
|
struct qtree_mem_dqinfo *qinfo;
|
|
ssize_t size;
|
|
unsigned int version;
|
|
int ret;
|
|
|
|
down_read(&dqopt->dqio_sem);
|
|
ret = v2_read_header(sb, type, &dqhead);
|
|
if (ret < 0)
|
|
goto out;
|
|
version = le32_to_cpu(dqhead.dqh_version);
|
|
if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
|
|
(info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
|
|
sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
|
|
if (size != sizeof(struct v2_disk_dqinfo)) {
|
|
quota_error(sb, "Can't read info structure");
|
|
if (size < 0)
|
|
ret = size;
|
|
else
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
|
|
if (!info->dqi_priv) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
qinfo = info->dqi_priv;
|
|
if (version == 0) {
|
|
/* limits are stored as unsigned 32-bit data */
|
|
info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
|
|
info->dqi_max_ino_limit = 0xffffffff;
|
|
} else {
|
|
/*
|
|
* Used space is stored as unsigned 64-bit value in bytes but
|
|
* quota core supports only signed 64-bit values so use that
|
|
* as a limit
|
|
*/
|
|
info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
|
|
info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
|
|
}
|
|
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
|
|
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
|
|
/* No flags currently supported */
|
|
info->dqi_flags = 0;
|
|
qinfo->dqi_sb = sb;
|
|
qinfo->dqi_type = type;
|
|
qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
|
|
qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
|
|
qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
|
|
qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
|
|
qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
|
|
qinfo->dqi_qtree_depth = qtree_depth(qinfo);
|
|
if (version == 0) {
|
|
qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
|
|
qinfo->dqi_ops = &v2r0_qtree_ops;
|
|
} else {
|
|
qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
|
|
qinfo->dqi_ops = &v2r1_qtree_ops;
|
|
}
|
|
ret = -EUCLEAN;
|
|
/* Some sanity checks of the read headers... */
|
|
if ((loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits >
|
|
i_size_read(sb_dqopt(sb)->files[type])) {
|
|
quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).",
|
|
(loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits,
|
|
i_size_read(sb_dqopt(sb)->files[type]));
|
|
goto out;
|
|
}
|
|
if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) {
|
|
quota_error(sb, "Free block number too big (%u >= %u).",
|
|
qinfo->dqi_free_blk, qinfo->dqi_blocks);
|
|
goto out;
|
|
}
|
|
if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) {
|
|
quota_error(sb, "Block with free entry too big (%u >= %u).",
|
|
qinfo->dqi_free_entry, qinfo->dqi_blocks);
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
up_read(&dqopt->dqio_sem);
|
|
return ret;
|
|
}
|
|
|
|
/* Write information header to quota file */
|
|
static int v2_write_file_info(struct super_block *sb, int type)
|
|
{
|
|
struct v2_disk_dqinfo dinfo;
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
struct mem_dqinfo *info = &dqopt->info[type];
|
|
struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
|
|
ssize_t size;
|
|
|
|
down_write(&dqopt->dqio_sem);
|
|
spin_lock(&dq_data_lock);
|
|
info->dqi_flags &= ~DQF_INFO_DIRTY;
|
|
dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
|
|
dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
|
|
/* No flags currently supported */
|
|
dinfo.dqi_flags = cpu_to_le32(0);
|
|
spin_unlock(&dq_data_lock);
|
|
dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
|
|
dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
|
|
dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
|
|
size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
|
|
sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
|
|
up_write(&dqopt->dqio_sem);
|
|
if (size != sizeof(struct v2_disk_dqinfo)) {
|
|
quota_error(sb, "Can't write info structure");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
|
|
{
|
|
struct v2r0_disk_dqblk *d = dp, empty;
|
|
struct mem_dqblk *m = &dquot->dq_dqb;
|
|
|
|
m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
|
|
m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
|
|
m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
|
|
m->dqb_itime = le64_to_cpu(d->dqb_itime);
|
|
m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
|
|
m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
|
|
m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
|
|
m->dqb_btime = le64_to_cpu(d->dqb_btime);
|
|
/* We need to escape back all-zero structure */
|
|
memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
|
|
empty.dqb_itime = cpu_to_le64(1);
|
|
if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
|
|
m->dqb_itime = 0;
|
|
}
|
|
|
|
static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
|
|
{
|
|
struct v2r0_disk_dqblk *d = dp;
|
|
struct mem_dqblk *m = &dquot->dq_dqb;
|
|
struct qtree_mem_dqinfo *info =
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
|
|
|
|
d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
|
|
d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
|
|
d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
|
|
d->dqb_itime = cpu_to_le64(m->dqb_itime);
|
|
d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
|
|
d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
|
|
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
|
|
d->dqb_btime = cpu_to_le64(m->dqb_btime);
|
|
d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
|
|
if (qtree_entry_unused(info, dp))
|
|
d->dqb_itime = cpu_to_le64(1);
|
|
}
|
|
|
|
static int v2r0_is_id(void *dp, struct dquot *dquot)
|
|
{
|
|
struct v2r0_disk_dqblk *d = dp;
|
|
struct qtree_mem_dqinfo *info =
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
|
|
|
|
if (qtree_entry_unused(info, dp))
|
|
return 0;
|
|
return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
|
|
le32_to_cpu(d->dqb_id)),
|
|
dquot->dq_id);
|
|
}
|
|
|
|
static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
|
|
{
|
|
struct v2r1_disk_dqblk *d = dp, empty;
|
|
struct mem_dqblk *m = &dquot->dq_dqb;
|
|
|
|
m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
|
|
m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
|
|
m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
|
|
m->dqb_itime = le64_to_cpu(d->dqb_itime);
|
|
m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
|
|
m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
|
|
m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
|
|
m->dqb_btime = le64_to_cpu(d->dqb_btime);
|
|
/* We need to escape back all-zero structure */
|
|
memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
|
|
empty.dqb_itime = cpu_to_le64(1);
|
|
if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
|
|
m->dqb_itime = 0;
|
|
}
|
|
|
|
static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
|
|
{
|
|
struct v2r1_disk_dqblk *d = dp;
|
|
struct mem_dqblk *m = &dquot->dq_dqb;
|
|
struct qtree_mem_dqinfo *info =
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
|
|
|
|
d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
|
|
d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
|
|
d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
|
|
d->dqb_itime = cpu_to_le64(m->dqb_itime);
|
|
d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
|
|
d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
|
|
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
|
|
d->dqb_btime = cpu_to_le64(m->dqb_btime);
|
|
d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
|
|
d->dqb_pad = 0;
|
|
if (qtree_entry_unused(info, dp))
|
|
d->dqb_itime = cpu_to_le64(1);
|
|
}
|
|
|
|
static int v2r1_is_id(void *dp, struct dquot *dquot)
|
|
{
|
|
struct v2r1_disk_dqblk *d = dp;
|
|
struct qtree_mem_dqinfo *info =
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
|
|
|
|
if (qtree_entry_unused(info, dp))
|
|
return 0;
|
|
return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
|
|
le32_to_cpu(d->dqb_id)),
|
|
dquot->dq_id);
|
|
}
|
|
|
|
static int v2_read_dquot(struct dquot *dquot)
|
|
{
|
|
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
|
|
int ret;
|
|
|
|
down_read(&dqopt->dqio_sem);
|
|
ret = qtree_read_dquot(
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
|
|
dquot);
|
|
up_read(&dqopt->dqio_sem);
|
|
return ret;
|
|
}
|
|
|
|
static int v2_write_dquot(struct dquot *dquot)
|
|
{
|
|
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
|
|
int ret;
|
|
bool alloc = false;
|
|
|
|
/*
|
|
* If space for dquot is already allocated, we don't need any
|
|
* protection as we'll only overwrite the place of dquot. We are
|
|
* still protected by concurrent writes of the same dquot by
|
|
* dquot->dq_lock.
|
|
*/
|
|
if (!dquot->dq_off) {
|
|
alloc = true;
|
|
down_write(&dqopt->dqio_sem);
|
|
} else {
|
|
down_read(&dqopt->dqio_sem);
|
|
}
|
|
ret = qtree_write_dquot(
|
|
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
|
|
dquot);
|
|
if (alloc)
|
|
up_write(&dqopt->dqio_sem);
|
|
else
|
|
up_read(&dqopt->dqio_sem);
|
|
return ret;
|
|
}
|
|
|
|
static int v2_release_dquot(struct dquot *dquot)
|
|
{
|
|
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
|
|
int ret;
|
|
|
|
down_write(&dqopt->dqio_sem);
|
|
ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
|
|
up_write(&dqopt->dqio_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int v2_free_file_info(struct super_block *sb, int type)
|
|
{
|
|
kfree(sb_dqinfo(sb, type)->dqi_priv);
|
|
return 0;
|
|
}
|
|
|
|
static int v2_get_next_id(struct super_block *sb, struct kqid *qid)
|
|
{
|
|
struct quota_info *dqopt = sb_dqopt(sb);
|
|
int ret;
|
|
|
|
down_read(&dqopt->dqio_sem);
|
|
ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
|
|
up_read(&dqopt->dqio_sem);
|
|
return ret;
|
|
}
|
|
|
|
static const struct quota_format_ops v2_format_ops = {
|
|
.check_quota_file = v2_check_quota_file,
|
|
.read_file_info = v2_read_file_info,
|
|
.write_file_info = v2_write_file_info,
|
|
.free_file_info = v2_free_file_info,
|
|
.read_dqblk = v2_read_dquot,
|
|
.commit_dqblk = v2_write_dquot,
|
|
.release_dqblk = v2_release_dquot,
|
|
.get_next_id = v2_get_next_id,
|
|
};
|
|
|
|
static struct quota_format_type v2r0_quota_format = {
|
|
.qf_fmt_id = QFMT_VFS_V0,
|
|
.qf_ops = &v2_format_ops,
|
|
.qf_owner = THIS_MODULE
|
|
};
|
|
|
|
static struct quota_format_type v2r1_quota_format = {
|
|
.qf_fmt_id = QFMT_VFS_V1,
|
|
.qf_ops = &v2_format_ops,
|
|
.qf_owner = THIS_MODULE
|
|
};
|
|
|
|
static int __init init_v2_quota_format(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_quota_format(&v2r0_quota_format);
|
|
if (ret)
|
|
return ret;
|
|
return register_quota_format(&v2r1_quota_format);
|
|
}
|
|
|
|
static void __exit exit_v2_quota_format(void)
|
|
{
|
|
unregister_quota_format(&v2r0_quota_format);
|
|
unregister_quota_format(&v2r1_quota_format);
|
|
}
|
|
|
|
module_init(init_v2_quota_format);
|
|
module_exit(exit_v2_quota_format);
|