From 8894f67be2ffabcd8b4491d552929b89bcebe36b Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Tue, 7 Aug 2007 09:09:51 +1000 Subject: [PATCH] [PATCH] drm/i915: Fix i965 secured batchbuffer usage (CVE-2007-3851) This 965G and above chipsets moved the batch buffer non-secure bits to another place. This means that previous drm's allowed in-secure batchbuffers to be submitted to the hardware from non-privileged users who are logged into X and and have access to direct rendering. Signed-off-by: Dave Airlie Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman Signed-off-by: Willy Tarreau --- drivers/char/drm/i915_dma.c | 14 +++++++++++--- drivers/char/drm/i915_drv.h | 1 + 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/char/drm/i915_dma.c b/drivers/char/drm/i915_dma.c index 9354ce3b0093..ab1a1d035104 100644 --- a/drivers/char/drm/i915_dma.c +++ b/drivers/char/drm/i915_dma.c @@ -172,6 +172,8 @@ static int i915_initialize(drm_device_t * dev, * private backbuffer/depthbuffer usage. */ dev_priv->use_mi_batchbuffer_start = 0; + if (IS_I965G(dev)) /* 965 doesn't support older method */ + dev_priv->use_mi_batchbuffer_start = 1; /* Allow hardware batchbuffers unless told otherwise. */ @@ -504,8 +506,13 @@ static int i915_dispatch_batchbuffer(drm_device_t * dev, if (dev_priv->use_mi_batchbuffer_start) { BEGIN_LP_RING(2); - OUT_RING(MI_BATCH_BUFFER_START | (2 << 6)); - OUT_RING(batch->start | MI_BATCH_NON_SECURE); + if (IS_I965G(dev)) { + OUT_RING(MI_BATCH_BUFFER_START | (2 << 6) | MI_BATCH_NON_SECURE_I965); + OUT_RING(batch->start); + } else { + OUT_RING(MI_BATCH_BUFFER_START | (2 << 6)); + OUT_RING(batch->start | MI_BATCH_NON_SECURE); + } ADVANCE_LP_RING(); } else { BEGIN_LP_RING(4); @@ -722,7 +729,8 @@ static int i915_setparam(DRM_IOCTL_ARGS) switch (param.param) { case I915_SETPARAM_USE_MI_BATCHBUFFER_START: - dev_priv->use_mi_batchbuffer_start = param.value; + if (!IS_I965G(dev)) + dev_priv->use_mi_batchbuffer_start = param.value; break; case I915_SETPARAM_TEX_LRU_LOG_GRANULARITY: dev_priv->tex_lru_log_granularity = param.value; diff --git a/drivers/char/drm/i915_drv.h b/drivers/char/drm/i915_drv.h index 93cdcfe6aa84..30022c895baa 100644 --- a/drivers/char/drm/i915_drv.h +++ b/drivers/char/drm/i915_drv.h @@ -280,6 +280,7 @@ extern int i915_wait_ring(drm_device_t * dev, int n, const char *caller); #define MI_BATCH_BUFFER_START (0x31<<23) #define MI_BATCH_BUFFER_END (0xA<<23) #define MI_BATCH_NON_SECURE (1) +#define MI_BATCH_NON_SECURE_I965 (1<<8) #define MI_WAIT_FOR_EVENT ((0x3<<23)) #define MI_WAIT_FOR_PLANE_A_FLIP (1<<2) -- 2.39.5