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btrfs: check unsupported filters in balance arguments 

We don't verify that all the balance filter arguments supplemented by
the flags are actually known to the kernel. Thus we let it silently pass
and do nothing.

At the moment this means only the 'limit' filter, but we're going to add
a few more soon so it's better to have that fixed. Also in older stable
kernels so that it works with newer userspace tools.

Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2015-10-12 16:55:54 +02:00 committed by Chris Mason
parent b06c4bf5c8
commit 849ef9286f
2 changed files with 13 additions and 0 deletions
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5
fs/btrfs/ioctl.c
View File

@ -4691,6 +4691,11 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
}
if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
ret = -EINVAL;
goto out_bargs;
}
do_balance:
/*
* Ownership of bctl and mutually_exclusive_operation_running

8
fs/btrfs/volumes.h
View File

@ -381,6 +381,14 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
#define BTRFS_BALANCE_ARGS_MASK \
(BTRFS_BALANCE_ARGS_PROFILES | \
BTRFS_BALANCE_ARGS_USAGE | \
BTRFS_BALANCE_ARGS_DEVID | \
BTRFS_BALANCE_ARGS_DRANGE | \
BTRFS_BALANCE_ARGS_VRANGE | \
BTRFS_BALANCE_ARGS_LIMIT)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if
* it already has the target profile (even though it may be