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authorTakashi Iwai <tiwai@suse.de>2021-05-17 15:15:38 +0200
committerTakashi Iwai <tiwai@suse.de>2021-05-17 16:04:10 +0200
commit4e268db74770b454b877ab5260f1868a457d212c (patch)
treed739e23399bb1edb4774a6b005ceaab388f33ded
parentALSA: usx2y: Coding style fixes (diff)
downloadlinux-4e268db74770b454b877ab5260f1868a457d212c.tar.xz
linux-4e268db74770b454b877ab5260f1868a457d212c.zip
ALSA: usx2y: Fix potential leaks of uninitialized memory
usx2y drivers may expose the allocated pages via mmap, but it performs zero-clear only for the struct size, not aligned with the page size. This leaves out some uninitialized trailing bytes. This patch fixes the clearance to cover all memory that are exposed to user-space. Link: https://lore.kernel.org/r/20210517131545.27252-5-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/usx2y/usX2Yhwdep.c8
-rw-r--r--sound/usb/usx2y/usbus428ctldefs.h2
-rw-r--r--sound/usb/usx2y/usbusx2y.c2
-rw-r--r--sound/usb/usx2y/usx2yhwdeppcm.c13
4 files changed, 15 insertions, 10 deletions
diff --git a/sound/usb/usx2y/usX2Yhwdep.c b/sound/usb/usx2y/usX2Yhwdep.c
index 2d4e943be2da..0ed50be89271 100644
--- a/sound/usb/usx2y/usX2Yhwdep.c
+++ b/sound/usb/usx2y/usX2Yhwdep.c
@@ -55,17 +55,17 @@ static int snd_us428ctls_mmap(struct snd_hwdep *hw, struct file *filp, struct vm
return -EBUSY;
/* if userspace tries to mmap beyond end of our buffer, fail */
- if (size > PAGE_ALIGN(sizeof(struct us428ctls_sharedmem))) {
- snd_printd("%lu > %lu\n", size, (unsigned long)sizeof(struct us428ctls_sharedmem));
+ if (size > US428_SHAREDMEM_PAGES) {
+ snd_printd("%lu > %lu\n", size, (unsigned long)US428_SHAREDMEM_PAGES);
return -EINVAL;
}
if (!us428->us428ctls_sharedmem) {
init_waitqueue_head(&us428->us428ctls_wait_queue_head);
- us428->us428ctls_sharedmem = alloc_pages_exact(sizeof(struct us428ctls_sharedmem), GFP_KERNEL);
+ us428->us428ctls_sharedmem = alloc_pages_exact(US428_SHAREDMEM_PAGES, GFP_KERNEL);
if (!us428->us428ctls_sharedmem)
return -ENOMEM;
- memset(us428->us428ctls_sharedmem, -1, sizeof(struct us428ctls_sharedmem));
+ memset(us428->us428ctls_sharedmem, -1, US428_SHAREDMEM_PAGES);
us428->us428ctls_sharedmem->ctl_snapshot_last = -2;
}
area->vm_ops = &us428ctls_vm_ops;
diff --git a/sound/usb/usx2y/usbus428ctldefs.h b/sound/usb/usx2y/usbus428ctldefs.h
index 06b27d23d3c2..9ba15d974e63 100644
--- a/sound/usb/usx2y/usbus428ctldefs.h
+++ b/sound/usb/usx2y/usbus428ctldefs.h
@@ -89,3 +89,5 @@ struct us428ctls_sharedmem {
struct us428_p4out p4out[N_US428_P4OUT_BUFS];
int p4out_last, p4out_sent;
};
+
+#define US428_SHAREDMEM_PAGES PAGE_ALIGN(sizeof(struct us428ctls_sharedmem))
diff --git a/sound/usb/usx2y/usbusx2y.c b/sound/usb/usx2y/usbusx2y.c
index 05b10bdc6380..25e04a0ff97b 100644
--- a/sound/usb/usx2y/usbusx2y.c
+++ b/sound/usb/usx2y/usbusx2y.c
@@ -430,7 +430,7 @@ static void snd_usx2y_card_private_free(struct snd_card *card)
usb_free_urb(usx2y->in04_urb);
if (usx2y->us428ctls_sharedmem)
free_pages_exact(usx2y->us428ctls_sharedmem,
- sizeof(*usx2y->us428ctls_sharedmem));
+ US428_SHAREDMEM_PAGES);
if (usx2y->card_index >= 0 && usx2y->card_index < SNDRV_CARDS)
snd_usx2y_card_used[usx2y->card_index] = 0;
}
diff --git a/sound/usb/usx2y/usx2yhwdeppcm.c b/sound/usb/usx2y/usx2yhwdeppcm.c
index 9219341d71c7..b988a4870de4 100644
--- a/sound/usb/usx2y/usx2yhwdeppcm.c
+++ b/sound/usb/usx2y/usx2yhwdeppcm.c
@@ -485,6 +485,9 @@ static int usx2y_usbpcm_urbs_start(struct snd_usx2y_substream *subs)
return err;
}
+#define USX2Y_HWDEP_PCM_PAGES \
+ PAGE_ALIGN(sizeof(struct snd_usx2y_hwdep_pcm_shm))
+
/*
* prepare callback
*
@@ -501,11 +504,11 @@ static int snd_usx2y_usbpcm_prepare(struct snd_pcm_substream *substream)
snd_printdd("snd_usx2y_pcm_prepare(%p)\n", substream);
if (!usx2y->hwdep_pcm_shm) {
- usx2y->hwdep_pcm_shm = alloc_pages_exact(sizeof(struct snd_usx2y_hwdep_pcm_shm),
+ usx2y->hwdep_pcm_shm = alloc_pages_exact(USX2Y_HWDEP_PCM_PAGES,
GFP_KERNEL);
if (!usx2y->hwdep_pcm_shm)
return -ENOMEM;
- memset(usx2y->hwdep_pcm_shm, 0, sizeof(struct snd_usx2y_hwdep_pcm_shm));
+ memset(usx2y->hwdep_pcm_shm, 0, USX2Y_HWDEP_PCM_PAGES);
}
mutex_lock(&usx2y->pcm_mutex);
@@ -692,8 +695,8 @@ static int snd_usx2y_hwdep_pcm_mmap(struct snd_hwdep *hw, struct file *filp, str
return -EBUSY;
/* if userspace tries to mmap beyond end of our buffer, fail */
- if (size > PAGE_ALIGN(sizeof(struct snd_usx2y_hwdep_pcm_shm))) {
- snd_printd("%lu > %lu\n", size, (unsigned long)sizeof(struct snd_usx2y_hwdep_pcm_shm));
+ if (size > USX2Y_HWDEP_PCM_PAGES) {
+ snd_printd("%lu > %lu\n", size, (unsigned long)USX2Y_HWDEP_PCM_PAGES);
return -EINVAL;
}
@@ -711,7 +714,7 @@ static void snd_usx2y_hwdep_pcm_private_free(struct snd_hwdep *hwdep)
struct usx2ydev *usx2y = hwdep->private_data;
if (usx2y->hwdep_pcm_shm)
- free_pages_exact(usx2y->hwdep_pcm_shm, sizeof(struct snd_usx2y_hwdep_pcm_shm));
+ free_pages_exact(usx2y->hwdep_pcm_shm, USX2Y_HWDEP_PCM_PAGES);
}
int usx2y_hwdep_pcm_new(struct snd_card *card)