Re: [PATCH] sysfs: Don't leak secdata when a sysfs_dirent is freed.

From: Eric W. Biederman
Date: Wed Nov 04 2009 - 05:36:35 EST



Grr. Please all ignore the 01/42 in the subject. Clearly I was
a bit too tired when I sent this but the fix is good and fixes a bug
2.6.32-rc5 that should be there in the first place.


ebiederm@xxxxxxxxxxxx (Eric W. Biederman) writes:

> While refreshing my sysfs patches I noticed a leak in the secdata
> implementation. We don't free the secdata when we free the
> sysfs dirent.
>
> This is a bug in 2.6.32-rc5 that we really should close.
>
> Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx>

> ---
> fs/sysfs/dir.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
> index 5fad489..e020183 100644
> --- a/fs/sysfs/dir.c
> +++ b/fs/sysfs/dir.c
> @@ -21,6 +21,7 @@
> #include <linux/completion.h>
> #include <linux/mutex.h>
> #include <linux/slab.h>
> +#include <linux/security.h>
> #include "sysfs.h"
>
> DEFINE_MUTEX(sysfs_mutex);
> @@ -285,6 +286,9 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
> sysfs_put(sd->s_symlink.target_sd);
> if (sysfs_type(sd) & SYSFS_COPY_NAME)
> kfree(sd->s_name);
> + if (sd->s_iattr && sd->s_iattr->ia_secdata)
> + security_release_secctx(sd->s_iattr->ia_secdata,
> + sd->s_iattr->ia_secdata_len);
> kfree(sd->s_iattr);
> sysfs_free_ino(sd->s_ino);
> kmem_cache_free(sysfs_dir_cachep, sd);
> --
> 1.6.5.2.143.g8cc62
>
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