If commands buffer claims a number of words that is higher than its BO can
fit, a kernel OOPS will be fired on the out-of-bounds BO access. This was
triggered by an opentegra Xorg driver that erroneously pushed too many
commands to the pushbuf.
The CDMA commands buffer address is 4 bytes aligned, so check its alignment.
The maximum number of the CDMA gather fetches is 16383, add a check for it.
Add a sanity check for the relocations in a same way.
[ 46.829393] Unable to handle kernel paging request at virtual address f09b2000
...
[<c04a3ba4>] (host1x_job_pin) from [<c04dfcd0>] (tegra_drm_submit+0x474/0x510)
[<c04dfcd0>] (tegra_drm_submit) from [<c04deea0>] (tegra_submit+0x50/0x6c)
[<c04deea0>] (tegra_submit) from [<c04c07c0>] (drm_ioctl+0x1e4/0x3ec)
[<c04c07c0>] (drm_ioctl) from [<c02541a0>] (do_vfs_ioctl+0x9c/0x8e4)
[<c02541a0>] (do_vfs_ioctl) from [<c0254a1c>] (SyS_ioctl+0x34/0x5c)
[<c0254a1c>] (SyS_ioctl) from [<c0107640>] (ret_fast_syscall+0x0/0x3c)
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
Reviewed-by: Erik Faye-Lund <kusmabite@xxxxxxxxx>
Reviewed-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/drm.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/tegra/gem.c | 5 -----
drivers/gpu/drm/tegra/gem.h | 5 +++++
3 files changed, 54 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index f9282da94a1f..c9246405fc7b 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -26,6 +26,7 @@
#define DRIVER_PATCHLEVEL 0
#define CARVEOUT_SZ SZ_64M
+#define CDMA_GATHER_FETCHES_MAX_NB 16383
struct tegra_drm_file {
struct idr contexts;
@@ -383,18 +384,42 @@ int tegra_drm_submit(struct tegra_drm_context *context,
while (num_cmdbufs) {
struct drm_tegra_cmdbuf cmdbuf;
struct host1x_bo *bo;
+ struct tegra_bo *obj;
+ u64 offset;
if (copy_from_user(&cmdbuf, cmdbufs, sizeof(cmdbuf))) {
err = -EFAULT;
goto fail;
}
+ /*
+ * The maximum number of CDMA gather fetches is 16383, a higher
+ * value means the words count is malformed.
+ */
+ if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
+ err = -EINVAL;
+ goto fail;
+ }
+
bo = host1x_bo_lookup(file, cmdbuf.handle);
if (!bo) {
err = -ENOENT;
goto fail;
}
+ offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
+ obj = host1x_to_tegra_bo(bo);
+
+ /*
+ * Gather buffer base address must be 4-bytes aligned,
+ * unaligned offset is malformed and cause commands stream
+ * corruption on the buffer address relocation.
+ */
+ if (offset & 3 || offset >= obj->gem.size) {
+ err = -EINVAL;
+ goto fail;
+ }
+
host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
num_cmdbufs--;
cmdbufs++;
@@ -402,11 +427,35 @@ int tegra_drm_submit(struct tegra_drm_context *context,
/* copy and resolve relocations from submit */
while (num_relocs--) {
+ struct host1x_reloc *reloc;
+ struct tegra_bo *obj;
+
err = host1x_reloc_copy_from_user(&job->relocarray[num_relocs],
&relocs[num_relocs], drm,
file);
if (err < 0)
goto fail;
+
+ reloc = &job->relocarray[num_relocs];
+ obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
+
+ /*
+ * The unaligned cmdbuf offset will cause an unaligned write
+ * during of the relocations patching, corrupting the commands
+ * stream.
+ */
+ if (reloc->cmdbuf.offset & 3 ||
+ reloc->cmdbuf.offset >= obj->gem.size) {
+ err = -EINVAL;
+ goto fail;
+ }
+
+ obj = host1x_to_tegra_bo(reloc->target.bo);
+
+ if (reloc->target.offset >= obj->gem.size) {
+ err = -EINVAL;
+ goto fail;
+ }
}
if (copy_from_user(job->waitchk, waitchks,
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 424569b53e57..7a39a355678a 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -20,11 +20,6 @@
#include "drm.h"
#include "gem.h"
-static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
-{
- return container_of(bo, struct tegra_bo, base);
-}
-
static void tegra_bo_put(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
diff --git a/drivers/gpu/drm/tegra/gem.h b/drivers/gpu/drm/tegra/gem.h
index 6c5f12ac0087..8b32a6fd586d 100644
--- a/drivers/gpu/drm/tegra/gem.h
+++ b/drivers/gpu/drm/tegra/gem.h
@@ -52,6 +52,11 @@ static inline struct tegra_bo *to_tegra_bo(struct drm_gem_object *gem)
return container_of(gem, struct tegra_bo, gem);
}
+static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
+{
+ return container_of(bo, struct tegra_bo, base);
+}
+
struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
unsigned long flags);
struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
--
2.13.0
--
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