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Date: Sat, 6 Oct 2018 23:07:06 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: joel@...lfernandes.org, paulmck@...ux.ibm.com,
Theodore Ts'o <tytso@....edu>, stable@...nel.org
Subject: [PATCH -v3] ext4: fix use-after-free race in ext4_remount()'s error path
It's possible for ext4_show_quota_options() to try reading
s_qf_names[i] while it is being modified by ext4_remount() --- most
notably, in ext4_remount's error path when the original values of the
quota file name gets restored.
Reported-by: syzbot+a2872d6feea6918008a9@...kaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org
---
v3: RCU clean ups and fix ups
v2: Use RCU to avoid lock dependency problems
fs/ext4/ext4.h | 3 +-
fs/ext4/super.c | 73 ++++++++++++++++++++++++++++++++-----------------
2 files changed, 50 insertions(+), 26 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 86e1bacac757..12f90d48ba61 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1405,7 +1405,8 @@ struct ext4_sb_info {
u32 s_min_batch_time;
struct block_device *journal_bdev;
#ifdef CONFIG_QUOTA
- char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
+ /* Names of quota files with journalled quota */
+ char __rcu *s_qf_names[EXT4_MAXQUOTAS];
int s_jquota_fmt; /* Format of quota to use */
#endif
unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index faf293ed8060..1909fbb28583 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -920,6 +920,18 @@ static inline void ext4_quota_off_umount(struct super_block *sb)
}
#endif
+/*
+ * This is a helper function which is used in the mount/remount
+ * codepaths (which holds s_umount) to fetch the quota file name.
+ */
+static inline char *get_qf_name(struct super_block *sb,
+ struct ext4_sb_info *sbi,
+ int type)
+{
+ return rcu_dereference_protected(sbi->s_qf_names[type],
+ lockdep_is_held(&sb->s_umount));
+}
+
static void ext4_put_super(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -965,7 +977,7 @@ static void ext4_put_super(struct super_block *sb)
percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
#ifdef CONFIG_QUOTA
for (i = 0; i < EXT4_MAXQUOTAS; i++)
- kfree(sbi->s_qf_names[i]);
+ kfree(get_qf_name(sb, sbi, i));
#endif
/* Debugging code just in case the in-memory inode orphan list
@@ -1531,11 +1543,10 @@ static const char deprecated_msg[] =
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- char *qname;
+ char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
int ret = -1;
- if (sb_any_quota_loaded(sb) &&
- !sbi->s_qf_names[qtype]) {
+ if (sb_any_quota_loaded(sb) && !old_qname) {
ext4_msg(sb, KERN_ERR,
"Cannot change journaled "
"quota options when quota turned on");
@@ -1552,8 +1563,8 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
"Not enough memory for storing quotafile name");
return -1;
}
- if (sbi->s_qf_names[qtype]) {
- if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
+ if (old_qname) {
+ if (strcmp(old_qname, qname) == 0)
ret = 1;
else
ext4_msg(sb, KERN_ERR,
@@ -1566,7 +1577,7 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
"quotafile must be on filesystem root");
goto errout;
}
- sbi->s_qf_names[qtype] = qname;
+ rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
set_opt(sb, QUOTA);
return 1;
errout:
@@ -1578,15 +1589,16 @@ static int clear_qf_name(struct super_block *sb, int qtype)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char *old_qname = get_qf_name(sb, sbi, qtype);
- if (sb_any_quota_loaded(sb) &&
- sbi->s_qf_names[qtype]) {
+ if (sb_any_quota_loaded(sb) && old_qname) {
ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
" when quota turned on");
return -1;
}
- kfree(sbi->s_qf_names[qtype]);
- sbi->s_qf_names[qtype] = NULL;
+ rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
+ synchronize_rcu();
+ kfree(old_qname);
return 1;
}
#endif
@@ -1961,7 +1973,7 @@ static int parse_options(char *options, struct super_block *sb,
int is_remount)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- char *p;
+ char *p, *usr_qf_name, *grp_qf_name;
substring_t args[MAX_OPT_ARGS];
int token;
@@ -1992,11 +2004,13 @@ static int parse_options(char *options, struct super_block *sb,
"Cannot enable project quota enforcement.");
return 0;
}
- if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
- if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
+ usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
+ grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
+ if (usr_qf_name || grp_qf_name) {
+ if (test_opt(sb, USRQUOTA) && usr_qf_name)
clear_opt(sb, USRQUOTA);
- if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
+ if (test_opt(sb, GRPQUOTA) && grp_qf_name)
clear_opt(sb, GRPQUOTA);
if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
@@ -2030,6 +2044,7 @@ static inline void ext4_show_quota_options(struct seq_file *seq,
{
#if defined(CONFIG_QUOTA)
struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char *usr_qf_name, *grp_qf_name;
if (sbi->s_jquota_fmt) {
char *fmtname = "";
@@ -2048,11 +2063,14 @@ static inline void ext4_show_quota_options(struct seq_file *seq,
seq_printf(seq, ",jqfmt=%s", fmtname);
}
- if (sbi->s_qf_names[USRQUOTA])
- seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
-
- if (sbi->s_qf_names[GRPQUOTA])
- seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
+ rcu_read_lock();
+ usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
+ grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
+ if (usr_qf_name)
+ seq_show_option(seq, "usrjquota", usr_qf_name);
+ if (grp_qf_name)
+ seq_show_option(seq, "grpjquota", grp_qf_name);
+ rcu_read_unlock();
#endif
}
@@ -5104,6 +5122,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
int err = 0;
#ifdef CONFIG_QUOTA
int i, j;
+ char *to_free[EXT4_MAXQUOTAS];
#endif
char *orig_data = kstrdup(data, GFP_KERNEL);
@@ -5123,8 +5142,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
for (i = 0; i < EXT4_MAXQUOTAS; i++)
if (sbi->s_qf_names[i]) {
- old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
- GFP_KERNEL);
+ char *qf_name = get_qf_name(sb, sbi, i);
+
+ old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
if (!old_opts.s_qf_names[i]) {
for (j = 0; j < i; j++)
kfree(old_opts.s_qf_names[j]);
@@ -5353,9 +5373,12 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
#ifdef CONFIG_QUOTA
sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
for (i = 0; i < EXT4_MAXQUOTAS; i++) {
- kfree(sbi->s_qf_names[i]);
- sbi->s_qf_names[i] = old_opts.s_qf_names[i];
+ to_free[i] = get_qf_name(sb, sbi, i);
+ rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
}
+ synchronize_rcu();
+ for (i = 0; i < EXT4_MAXQUOTAS; i++)
+ kfree(to_free[i]);
#endif
kfree(orig_data);
return err;
@@ -5546,7 +5569,7 @@ static int ext4_write_info(struct super_block *sb, int type)
*/
static int ext4_quota_on_mount(struct super_block *sb, int type)
{
- return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
+ return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
EXT4_SB(sb)->s_jquota_fmt, type);
}
--
2.18.0.rc0
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