linux-kernel - [PATCH 7/8] staging: dream: fix information leak to userland

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Fri, 29 Oct 2010 00:02:07 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, Tejun Heo <tj@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 7/8] staging: dream: fix information leak to userland

Structure msm_audio_stats is copied to userland with some fields unitialized.
It leads to leaking of contents of kernel stack memory.
Also struct msm_audio_config has field "unused" of type array of 3 elements,
not 4.  Instead of this, initialize field "type".

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 drivers/staging/dream/qdsp5/audio_qcelp.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/dream/qdsp5/audio_qcelp.c b/drivers/staging/dream/qdsp5/audio_qcelp.c
index 911bab4..0ffc870 100644
--- a/drivers/staging/dream/qdsp5/audio_qcelp.c
+++ b/drivers/staging/dream/qdsp5/audio_qcelp.c
@@ -478,6 +478,7 @@ static long audqcelp_ioctl(struct file *file, unsigned int cmd,
 
 	if (cmd == AUDIO_GET_STATS) {
 		struct msm_audio_stats stats;
+		memset(&stats, 0, sizeof(stats));
 		stats.byte_count = audpp_avsync_byte_count(audio->dec_id);
 		stats.sample_count = audpp_avsync_sample_count(audio->dec_id);
 		if (copy_to_user((void *)arg, &stats, sizeof(stats)))
@@ -529,10 +530,10 @@ static long audqcelp_ioctl(struct file *file, unsigned int cmd,
 			config.buffer_count = BUF_COUNT;
 			config.sample_rate = 8000;
 			config.channel_count = 1;
+			config.type = 0;
 			config.unused[0] = 0;
 			config.unused[1] = 0;
 			config.unused[2] = 0;
-			config.unused[3] = 0;
 			if (copy_to_user((void *)arg, &config,
 					 sizeof(config)))
 				rc = -EFAULT;
-- 
1.7.0.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/