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-rw-r--r--fs/quota/dquot.c40
-rw-r--r--fs/quota/quota_tree.c73
2 files changed, 92 insertions, 21 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 22d904bde6ab..0427b44bfee5 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -79,6 +79,7 @@
#include <linux/capability.h>
#include <linux/quotaops.h>
#include <linux/blkdev.h>
+#include <linux/sched/mm.h>
#include "../internal.h" /* ugh */
#include <linux/uaccess.h>
@@ -425,9 +426,11 @@ EXPORT_SYMBOL(mark_info_dirty);
int dquot_acquire(struct dquot *dquot)
{
int ret = 0, ret2 = 0;
+ unsigned int memalloc;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
+ memalloc = memalloc_nofs_save();
if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
if (ret < 0)
@@ -458,6 +461,7 @@ int dquot_acquire(struct dquot *dquot)
smp_mb__before_atomic();
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_iolock:
+ memalloc_nofs_restore(memalloc);
mutex_unlock(&dquot->dq_lock);
return ret;
}
@@ -469,9 +473,11 @@ EXPORT_SYMBOL(dquot_acquire);
int dquot_commit(struct dquot *dquot)
{
int ret = 0;
+ unsigned int memalloc;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
+ memalloc = memalloc_nofs_save();
if (!clear_dquot_dirty(dquot))
goto out_lock;
/* Inactive dquot can be only if there was error during read/init
@@ -481,6 +487,7 @@ int dquot_commit(struct dquot *dquot)
else
ret = -EIO;
out_lock:
+ memalloc_nofs_restore(memalloc);
mutex_unlock(&dquot->dq_lock);
return ret;
}
@@ -492,9 +499,11 @@ EXPORT_SYMBOL(dquot_commit);
int dquot_release(struct dquot *dquot)
{
int ret = 0, ret2 = 0;
+ unsigned int memalloc;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
+ memalloc = memalloc_nofs_save();
/* Check whether we are not racing with some other dqget() */
if (dquot_is_busy(dquot))
goto out_dqlock;
@@ -510,6 +519,7 @@ int dquot_release(struct dquot *dquot)
}
clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_dqlock:
+ memalloc_nofs_restore(memalloc);
mutex_unlock(&dquot->dq_lock);
return ret;
}
@@ -690,9 +700,14 @@ int dquot_quota_sync(struct super_block *sb, int type)
/* This is not very clever (and fast) but currently I don't know about
* any other simple way of getting quota data to disk and we must get
* them there for userspace to be visible... */
- if (sb->s_op->sync_fs)
- sb->s_op->sync_fs(sb, 1);
- sync_blockdev(sb->s_bdev);
+ if (sb->s_op->sync_fs) {
+ ret = sb->s_op->sync_fs(sb, 1);
+ if (ret)
+ return ret;
+ }
+ ret = sync_blockdev(sb->s_bdev);
+ if (ret)
+ return ret;
/*
* Now when everything is written we can discard the pagecache so
@@ -2070,7 +2085,8 @@ EXPORT_SYMBOL(__dquot_transfer);
/* Wrapper for transferring ownership of an inode for uid/gid only
* Called from FSXXX_setattr()
*/
-int dquot_transfer(struct inode *inode, struct iattr *iattr)
+int dquot_transfer(struct user_namespace *mnt_userns, struct inode *inode,
+ struct iattr *iattr)
{
struct dquot *transfer_to[MAXQUOTAS] = {};
struct dquot *dquot;
@@ -2080,8 +2096,11 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
if (!dquot_active(inode))
return 0;
- if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){
- dquot = dqget(sb, make_kqid_uid(iattr->ia_uid));
+ if (i_uid_needs_update(mnt_userns, iattr, inode)) {
+ kuid_t kuid = from_vfsuid(mnt_userns, i_user_ns(inode),
+ iattr->ia_vfsuid);
+
+ dquot = dqget(sb, make_kqid_uid(kuid));
if (IS_ERR(dquot)) {
if (PTR_ERR(dquot) != -ESRCH) {
ret = PTR_ERR(dquot);
@@ -2091,8 +2110,11 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
}
transfer_to[USRQUOTA] = dquot;
}
- if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){
- dquot = dqget(sb, make_kqid_gid(iattr->ia_gid));
+ if (i_gid_needs_update(mnt_userns, iattr, inode)) {
+ kgid_t kgid = from_vfsgid(mnt_userns, i_user_ns(inode),
+ iattr->ia_vfsgid);
+
+ dquot = dqget(sb, make_kqid_gid(kgid));
if (IS_ERR(dquot)) {
if (PTR_ERR(dquot) != -ESRCH) {
ret = PTR_ERR(dquot);
@@ -2980,7 +3002,7 @@ static int __init dquot_init(void)
pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
" %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
- if (register_shrinker(&dqcache_shrinker))
+ if (register_shrinker(&dqcache_shrinker, "dquota-cache"))
panic("Cannot register dquot shrinker");
return 0;
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index 5f2405994280..0f1493e0f6d0 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -71,6 +71,40 @@ static ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf)
return ret;
}
+static inline int do_check_range(struct super_block *sb, const char *val_name,
+ uint val, uint min_val, uint max_val)
+{
+ if (val < min_val || val > max_val) {
+ quota_error(sb, "Getting %s %u out of range %u-%u",
+ val_name, val, min_val, max_val);
+ return -EUCLEAN;
+ }
+
+ return 0;
+}
+
+static int check_dquot_block_header(struct qtree_mem_dqinfo *info,
+ struct qt_disk_dqdbheader *dh)
+{
+ int err = 0;
+
+ err = do_check_range(info->dqi_sb, "dqdh_next_free",
+ le32_to_cpu(dh->dqdh_next_free), 0,
+ info->dqi_blocks - 1);
+ if (err)
+ return err;
+ err = do_check_range(info->dqi_sb, "dqdh_prev_free",
+ le32_to_cpu(dh->dqdh_prev_free), 0,
+ info->dqi_blocks - 1);
+ if (err)
+ return err;
+ err = do_check_range(info->dqi_sb, "dqdh_entries",
+ le16_to_cpu(dh->dqdh_entries), 0,
+ qtree_dqstr_in_blk(info));
+
+ return err;
+}
+
/* Remove empty block from list and return it */
static int get_free_dqblk(struct qtree_mem_dqinfo *info)
{
@@ -85,6 +119,9 @@ static int get_free_dqblk(struct qtree_mem_dqinfo *info)
ret = read_blk(info, blk, buf);
if (ret < 0)
goto out_buf;
+ ret = check_dquot_block_header(info, dh);
+ if (ret)
+ goto out_buf;
info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free);
}
else {
@@ -232,6 +269,9 @@ static uint find_free_dqentry(struct qtree_mem_dqinfo *info,
*err = read_blk(info, blk, buf);
if (*err < 0)
goto out_buf;
+ *err = check_dquot_block_header(info, dh);
+ if (*err)
+ goto out_buf;
} else {
blk = get_free_dqblk(info);
if ((int)blk < 0) {
@@ -313,6 +353,10 @@ static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
}
ref = (__le32 *)buf;
newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
+ ret = do_check_range(dquot->dq_sb, "block", newblk, 0,
+ info->dqi_blocks - 1);
+ if (ret)
+ goto out_buf;
if (!newblk)
newson = 1;
if (depth == info->dqi_qtree_depth - 1) {
@@ -424,6 +468,9 @@ static int free_dqentry(struct qtree_mem_dqinfo *info, struct dquot *dquot,
goto out_buf;
}
dh = (struct qt_disk_dqdbheader *)buf;
+ ret = check_dquot_block_header(info, dh);
+ if (ret)
+ goto out_buf;
le16_add_cpu(&dh->dqdh_entries, -1);
if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */
ret = remove_free_dqentry(info, buf, blk);
@@ -480,12 +527,10 @@ static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
goto out_buf;
}
newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
- if (newblk < QT_TREEOFF || newblk >= info->dqi_blocks) {
- quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
- newblk, info->dqi_blocks);
- ret = -EUCLEAN;
+ ret = do_check_range(dquot->dq_sb, "block", newblk, QT_TREEOFF,
+ info->dqi_blocks - 1);
+ if (ret)
goto out_buf;
- }
if (depth == info->dqi_qtree_depth - 1) {
ret = free_dqentry(info, dquot, newblk);
@@ -586,12 +631,10 @@ static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
if (!blk) /* No reference? */
goto out_buf;
- if (blk < QT_TREEOFF || blk >= info->dqi_blocks) {
- quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
- blk, info->dqi_blocks);
- ret = -EUCLEAN;
+ ret = do_check_range(dquot->dq_sb, "block", blk, QT_TREEOFF,
+ info->dqi_blocks - 1);
+ if (ret)
goto out_buf;
- }
if (depth < info->dqi_qtree_depth - 1)
ret = find_tree_dqentry(info, dquot, blk, depth+1);
@@ -705,15 +748,21 @@ static int find_next_id(struct qtree_mem_dqinfo *info, qid_t *id,
goto out_buf;
}
for (i = __get_index(info, *id, depth); i < epb; i++) {
- if (ref[i] == cpu_to_le32(0)) {
+ uint blk_no = le32_to_cpu(ref[i]);
+
+ if (blk_no == 0) {
*id += level_inc;
continue;
}
+ ret = do_check_range(info->dqi_sb, "block", blk_no, 0,
+ info->dqi_blocks - 1);
+ if (ret)
+ goto out_buf;
if (depth == info->dqi_qtree_depth - 1) {
ret = 0;
goto out_buf;
}
- ret = find_next_id(info, id, le32_to_cpu(ref[i]), depth + 1);
+ ret = find_next_id(info, id, blk_no, depth + 1);
if (ret != -ENOENT)
break;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.