ALSA: rawmidi: Fix race at copying & updating the position

Orabug: 23330805

[ Upstream commit 81f577542af15640cbcb6ef68baa4caa610cbbfc ]

The rawmidi read and write functions manage runtime stream status
such as runtime->appl_ptr and runtime->avail.  These point where to
copy the new data and how many bytes have been copied (or to be
read).  The problem is that rawmidi read/write call copy_from_user()
or copy_to_user(), and the runtime spinlock is temporarily unlocked
and relocked while copying user-space.  Since the current code
advances and updates the runtime status after the spin unlock/relock,
the copy and the update may be asynchronous, and eventually
runtime->avail might go to a negative value when many concurrent
accesses are done.  This may lead to memory corruption in the end.

For fixing this race, in this patch, the status update code is
performed in the same lock before the temporary unlock.  Also, the
spinlock is now taken more widely in snd_rawmidi_kernel_read1() for
protecting more properly during the whole operation.

BugLink: http://lkml.kernel.org/r/CACT4Y+b-dCmNf1GpgPKfDO0ih+uZCL2JV4__j-r1kdhPLSgQCQ@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit a2c892c31423bdef823c6f6b2d54c159be8f4e20)

Signed-off-by: Dan Duval <dan.duval@oracle.com>

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index f75d1656272c87c35780dfb7017bf239aa29c331..af8c7a5d6c417b4ed030b326b247116361a65387 100644 (file)
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -942,31 +942,36 @@ static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
        unsigned long flags;
        long result = 0, count1;
        struct snd_rawmidi_runtime *runtime = substream->runtime;
+       unsigned long appl_ptr;
 
+       spin_lock_irqsave(&runtime->lock, flags);
        while (count > 0 && runtime->avail) {
                count1 = runtime->buffer_size - runtime->appl_ptr;
                if (count1 > count)
                        count1 = count;
-               spin_lock_irqsave(&runtime->lock, flags);
                if (count1 > (int)runtime->avail)
                        count1 = runtime->avail;
+
+               /* update runtime->appl_ptr before unlocking for userbuf */
+               appl_ptr = runtime->appl_ptr;
+               runtime->appl_ptr += count1;
+               runtime->appl_ptr %= runtime->buffer_size;
+               runtime->avail -= count1;
+
                if (kernelbuf)
-                       memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
+                       memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
                if (userbuf) {
                        spin_unlock_irqrestore(&runtime->lock, flags);
                        if (copy_to_user(userbuf + result,
-                                        runtime->buffer + runtime->appl_ptr, count1)) {
+                                        runtime->buffer + appl_ptr, count1)) {
                                return result > 0 ? result : -EFAULT;
                        }
                        spin_lock_irqsave(&runtime->lock, flags);
                }
-               runtime->appl_ptr += count1;
-               runtime->appl_ptr %= runtime->buffer_size;
-               runtime->avail -= count1;
-               spin_unlock_irqrestore(&runtime->lock, flags);
                result += count1;
                count -= count1;
        }
+       spin_unlock_irqrestore(&runtime->lock, flags);
        return result;
 }
 
@@ -1177,6 +1182,7 @@ static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
        unsigned long flags;
        long count1, result;
        struct snd_rawmidi_runtime *runtime = substream->runtime;
+       unsigned long appl_ptr;
 
        if (!kernelbuf && !userbuf)
                return -EINVAL;
@@ -1197,12 +1203,19 @@ static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
                        count1 = count;
                if (count1 > (long)runtime->avail)
                        count1 = runtime->avail;
+
+               /* update runtime->appl_ptr before unlocking for userbuf */
+               appl_ptr = runtime->appl_ptr;
+               runtime->appl_ptr += count1;
+               runtime->appl_ptr %= runtime->buffer_size;
+               runtime->avail -= count1;
+
                if (kernelbuf)
-                       memcpy(runtime->buffer + runtime->appl_ptr,
+                       memcpy(runtime->buffer + appl_ptr,
                               kernelbuf + result, count1);
                else if (userbuf) {
                        spin_unlock_irqrestore(&runtime->lock, flags);
-                       if (copy_from_user(runtime->buffer + runtime->appl_ptr,
+                       if (copy_from_user(runtime->buffer + appl_ptr,
                                           userbuf + result, count1)) {
                                spin_lock_irqsave(&runtime->lock, flags);
                                result = result > 0 ? result : -EFAULT;
@@ -1210,9 +1223,6 @@ static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
                        }
                        spin_lock_irqsave(&runtime->lock, flags);
                }
-               runtime->appl_ptr += count1;
-               runtime->appl_ptr %= runtime->buffer_size;
-               runtime->avail -= count1;
                result += count1;
                count -= count1;
        }