This is a note to let you know that I've just added the patch titled
ALSA: pcm: Fix snd_pcm_hw_params struct copy in compat mode
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-pcm-fix-snd_pcm_hw_params-struct-copy-in-compat-mode.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 43c54b8c7cfe22f868a751ba8a59abf1724160b1 Mon Sep 17 00:00:00 2001
From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Date: Mon, 18 Jan 2016 21:35:00 +0800
Subject: ALSA: pcm: Fix snd_pcm_hw_params struct copy in compat mode
From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
commit 43c54b8c7cfe22f868a751ba8a59abf1724160b1 upstream.
This reverts one hunk of
commit ef44a1ec6eee ("ALSA: sound/core: use memdup_user()"), which
replaced a number of kmalloc followed by memcpy with memdup calls.
In this case, we are copying from a struct snd_pcm_hw_params32 to
a struct snd_pcm_hw_params, but the latter is 4 bytes longer than
the 32-bit version, so we need to separate kmalloc and copy calls.
This actually leads to an out-of-bounds memory access later on
in sound/soc/soc-pcm.c:soc_pcm_hw_params() (detected using KASan).
Fixes: ef44a1ec6eee ('ALSA: sound/core: use memdup_user()')
Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/pcm_compat.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -255,10 +255,15 @@ static int snd_pcm_ioctl_hw_params_compa
if (! (runtime = substream->runtime))
return -ENOTTY;
- /* only fifo_size is different, so just copy all */
- data = memdup_user(data32, sizeof(*data32));
- if (IS_ERR(data))
- return PTR_ERR(data);
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* only fifo_size (RO from userspace) is different, so just copy all */
+ if (copy_from_user(data, data32, sizeof(*data32))) {
+ err = -EFAULT;
+ goto error;
+ }
if (refine)
err = snd_pcm_hw_refine(substream, data);
Patches currently in stable-queue which might be from drinkcat@xxxxxxxxxxxx are
queue-4.4/alsa-pcm-fix-snd_pcm_hw_params-struct-copy-in-compat-mode.patch
queue-4.4/alsa-seq-fix-snd_seq_call_port_info_ioctl-in-compat-mode.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html