From: Waiman Long <longman@redhat.com>
To: dsterba@suse.cz, Andrew Morton <akpm@linux-foundation.org>,
David Howells <dhowells@redhat.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Joe Perches <joe@perches.com>,
Matthew Wilcox <willy@infradead.org>,
David Rientjes <rientjes@google.com>,
Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
"Jason A . Donenfeld" <Jason@zx2c4.com>,
linux-mm@kvack.org, keyrings@vger.kernel.org,
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Subject: Re: [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info()
Date: Tue, 16 Jun 2020 11:05:22 -0400 [thread overview]
Message-ID: <75152002-5f02-04b6-a811-29ef79961e0b@redhat.com> (raw)
In-Reply-To: <20200616144804.GD27795@twin.jikos.cz>
On 6/16/20 10:48 AM, David Sterba wrote:
> On Mon, Jun 15, 2020 at 09:57:18PM -0400, Waiman Long wrote:
>> In btrfs_ioctl_get_subvol_info(), there is a classic case where kzalloc()
>> was incorrectly paired with kzfree(). According to David Sterba, there
>> isn't any sensitive information in the subvol_info that needs to be
>> cleared before freeing. So kfree_sensitive() isn't really needed,
>> use kfree() instead.
>>
>> Reported-by: David Sterba <dsterba@suse.cz>
>> Signed-off-by: Waiman Long <longman@redhat.com>
>> ---
>> fs/btrfs/ioctl.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
>> index f1dd9e4271e9..e8f7c5f00894 100644
>> --- a/fs/btrfs/ioctl.c
>> +++ b/fs/btrfs/ioctl.c
>> @@ -2692,7 +2692,7 @@ static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
>> btrfs_put_root(root);
>> out_free:
>> btrfs_free_path(path);
>> - kfree_sensitive(subvol_info);
>> + kfree(subvol_info);
> I would rather merge a patch doing to kzfree -> kfree instead of doing
> the middle step to switch it to kfree_sensitive. If it would help
> integration of your patchset I can push it to the next rc so there are
> no kzfree left in the btrfs code. Treewide change like that can take
> time so it would be one less problem to care about for you.
>
Sure, I will move it forward in the patch series.
Thanks,
Longman
next prev parent reply other threads:[~2020-06-16 15:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 1:57 [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-06-16 1:57 ` [PATCH v4 1/3] mm/slab: Use memzero_explicit() in kzfree() Waiman Long
2020-06-16 3:30 ` Eric Biggers
2020-06-16 13:05 ` Waiman Long
2020-06-16 15:46 ` David Howells
2020-06-16 6:42 ` Michal Hocko
2020-06-16 9:08 ` Dan Carpenter
2020-06-16 1:57 ` [PATCH v4 2/3] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-06-16 14:26 ` Dan Carpenter
2020-06-16 15:05 ` Waiman Long
2020-06-16 1:57 ` [PATCH v4 3/3] btrfs: Use kfree() in btrfs_ioctl_get_subvol_info() Waiman Long
2020-06-16 14:48 ` David Sterba
2020-06-16 15:05 ` Waiman Long [this message]
2020-06-16 18:53 ` [PATCH v4 0/3] mm, treewide: Rename kzfree() to kfree_sensitive() Joe Perches
2020-06-16 19:43 ` Waiman Long
2020-06-16 19:46 ` Jason A. Donenfeld
2020-06-16 20:01 ` Waiman Long
2020-06-16 21:14 ` Matthew Wilcox
2020-06-16 23:01 ` David Sterba
2020-06-17 0:37 ` Matthew Wilcox
2020-06-17 7:12 ` Michal Hocko
2020-06-17 11:08 ` Matthew Wilcox
2020-06-17 11:31 ` Michal Hocko
2020-06-17 12:23 ` Matthew Wilcox
2020-06-17 12:55 ` Michal Hocko
2020-06-17 8:03 ` Jo -l
2020-06-17 21:31 ` Denis Efremov
2020-06-17 23:12 ` Joe Perches
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