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fs: Protect reconfiguration of sb read-write from racing writes

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The reconfigure / remount code takes a lot of effort to protect
filesystem's reconfiguration code from racing writes on remounting
read-only. However during remounting read-only filesystem to read-write
mode userspace writes can start immediately once we clear SB_RDONLY
flag. This is inconvenient for example for ext4 because we need to do
some writes to the filesystem (such as preparation of quota files)
before we can take userspace writes so we are clearing SB_RDONLY flag
before we are fully ready to accept userpace writes and syzbot has found
a way to exploit this [1]. Also as far as I'm reading the code
the filesystem remount code was protected from racing writes in the
legacy mount path by the mount's MNT_READONLY flag so this is relatively
new problem. It is actually fairly easy to protect remount read-write
from racing writes using sb->s_readonly_remount flag so let's just do
that instead of having to workaround these races in the filesystem code.

[1] https://lore.kernel.org/all/00000000000006a0df05f6667499@google.com/T/

Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230615113848.8439-1-jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jan Kara 2023-06-15 13:38:48 +02:00 committed by Christian Brauner
parent 2d8c9dcf71
commit c541dce86c
1 changed files with 10 additions and 1 deletions
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11
fs/super.c
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@ -903,6 +903,7 @@ int reconfigure_super(struct fs_context *fc)
struct super_block *sb = fc->root->d_sb;
int retval;
bool remount_ro = false;
bool remount_rw = false;
bool force = fc->sb_flags & SB_FORCE;
if (fc->sb_flags_mask & ~MS_RMT_MASK)
@ -920,7 +921,7 @@ int reconfigure_super(struct fs_context *fc)
bdev_read_only(sb->s_bdev))
return -EACCES;
#endif
remount_rw = !(fc->sb_flags & SB_RDONLY) && sb_rdonly(sb);
remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);
}
@ -950,6 +951,14 @@ int reconfigure_super(struct fs_context *fc)
if (retval)
return retval;
}
} else if (remount_rw) {
/*
* We set s_readonly_remount here to protect filesystem's
* reconfigure code from writes from userspace until
* reconfigure finishes.
*/
sb->s_readonly_remount = 1;
smp_wmb();
}
if (fc->ops->reconfigure) {