Messages in this thread Patch in this message | | | From | Vasiliy Kulikov <> | Subject | [PATCH 3/8] staging: dream: fix information leak to userland | Date | Fri, 29 Oct 2010 00:01:47 +0400 |
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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@gmail.com> --- drivers/staging/dream/qdsp5/audio_evrc.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/dream/qdsp5/audio_evrc.c b/drivers/staging/dream/qdsp5/audio_evrc.c index 24a8926..b1f9233 100644 --- a/drivers/staging/dream/qdsp5/audio_evrc.c +++ b/drivers/staging/dream/qdsp5/audio_evrc.c @@ -481,6 +481,7 @@ static long audevrc_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))) @@ -515,10 +516,10 @@ static long audevrc_ioctl(struct file *file, unsigned int cmd, config.buffer_count = 2; 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; else -- 1.7.0.4
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