At Sat, 25 Sep 2010 11:07:27 -0400, Dan Rosenberg wrote:

The SNDRV_HDSP_IOCTL_GET_CONFIG_INFO and SNDRV_HDSP_IOCTL_GET_CONFIG_INFO ioctls in hdspm.c and hdsp.c allow unprivileged users to read uninitialized kernel stack memory, because several fields of the hdsp{m}_config_info structs declared on the stack are not altered or zeroed before being copied back to the user. This patch takes care of it.

Signed-off-by: Dan Rosenberg dan.j.rosenberg@gmail.com

Thanks, applied now with minor optimization (memset outside spinlock).

Takashi

diff -urp linux-2.6.35.5.orig/sound/pci/rme9652/hdsp.c linux-2.6.35.5/sound/pci/rme9652/hdsp.c --- linux-2.6.35.5.orig/sound/pci/rme9652/hdsp.c 2010-09-20 16:59:09.000000000 -0400 +++ linux-2.6.35.5/sound/pci/rme9652/hdsp.c 2010-09-25 10:59:42.000000000 -0400 @@ -4601,6 +4601,8 @@ static int snd_hdsp_hwdep_ioctl(struct s unsigned long flags; int i;

• memset(&info, 0, sizeof(info));
  

• err = hdsp_check_for_iobox(hdsp); if (err < 0) return err;

diff -urp linux-2.6.35.5.orig/sound/pci/rme9652/hdspm.c linux-2.6.35.5/sound/pci/rme9652/hdspm.c --- linux-2.6.35.5.orig/sound/pci/rme9652/hdspm.c 2010-09-20 16:59:09.000000000 -0400 +++ linux-2.6.35.5/sound/pci/rme9652/hdspm.c 2010-09-25 10:58:44.000000000 -0400 @@ -4128,6 +4128,9 @@ static int snd_hdspm_hwdep_ioctl(struct case SNDRV_HDSPM_IOCTL_GET_CONFIG_INFO:

spin_lock_irq(&hdspm->lock);

• memset(&info, 0, sizeof(info));
  

• info.pref_sync_ref = hdspm_pref_sync_ref(hdspm); info.wordclock_sync_check = hdspm_wc_sync_check(hdspm);