[PATCH 6/6] drm/i915/uc: Hardening firmware fetch
Michal Wajdeczko
michal.wajdeczko at intel.com
Tue Aug 6 12:54:41 UTC 2019
Insert few more failure points into firmware fetch procedure
to check explicit fw disabling, using wrong blob name or
using mismatched or undefined fw versions.
Also update some messages (remove ptr, duplicated infos) and
stop treating all fetch errors as missing firmware case.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 150 ++++++++++++++++-------
drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h | 3 +
2 files changed, 110 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index bb1f3ac06872..345b27f119aa 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -153,20 +153,67 @@ static const char *__override_huc_firmware_path(void)
return "";
}
-static bool
-__uc_fw_override(struct intel_uc_fw *uc_fw)
+static void __uc_fw_user_override(struct intel_uc_fw *uc_fw)
{
+ const char *path = NULL;
+
switch (uc_fw->type) {
case INTEL_UC_FW_TYPE_GUC:
- uc_fw->path = __override_guc_firmware_path();
+ path = __override_guc_firmware_path();
break;
case INTEL_UC_FW_TYPE_HUC:
- uc_fw->path = __override_huc_firmware_path();
+ path = __override_huc_firmware_path();
break;
}
- uc_fw->user_overridden = uc_fw->path;
- return uc_fw->user_overridden;
+ if (unlikely(path)) {
+ uc_fw->path = path;
+ uc_fw->user_overridden = true;
+ }
+}
+
+static void __uc_fw_fake_failures(struct intel_uc_fw *uc_fw,
+ struct drm_i915_private *i915,
+ bool user)
+{
+ int e = user ? -EINVAL : -ESTALE;
+
+ /* already disabled */
+ if (!uc_fw->path || !*uc_fw->path)
+ return;
+
+ if (i915_inject_load_error(i915, e)) {
+ /* disable */
+ uc_fw->path = "";
+ uc_fw->user_overridden = user;
+ } else if (i915_inject_load_error(i915, e)) {
+ /* non-existing blob */
+ uc_fw->path = intel_uc_fw_type_repr(uc_fw->type);
+ uc_fw->user_overridden = user;
+ } else if (i915_inject_load_error(i915, e)) {
+ /* newer major version */
+ uc_fw->major_ver_wanted += 1;
+ uc_fw->minor_ver_wanted = 0;
+ uc_fw->user_overridden = user;
+ } else if (i915_inject_load_error(i915, e)) {
+ /* newer minor version */
+ uc_fw->minor_ver_wanted += 1;
+ uc_fw->user_overridden = user;
+ } else if (uc_fw->major_ver_wanted && i915_inject_load_error(i915, e)) {
+ /* older major version */
+ uc_fw->major_ver_wanted -= 1;
+ uc_fw->minor_ver_wanted = 0;
+ uc_fw->user_overridden = user;
+ } else if (uc_fw->minor_ver_wanted && i915_inject_load_error(i915, e)) {
+ /* older minor version - hey, this should always work! */
+ uc_fw->minor_ver_wanted -= 1;
+ uc_fw->user_overridden = user;
+ } else if (i915_inject_load_error(i915, e)) {
+ /* unsupported platform */
+ uc_fw->major_ver_wanted = 0;
+ uc_fw->minor_ver_wanted = 0;
+ uc_fw->user_overridden = user;
+ }
}
/**
@@ -192,9 +239,14 @@ void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
uc_fw->type = type;
- if (HAS_GT_UC(i915) && likely(!__uc_fw_override(uc_fw)))
+ if (HAS_GT_UC(i915)) {
__uc_fw_auto_select(uc_fw, INTEL_INFO(i915)->platform,
INTEL_REVID(i915));
+ __uc_fw_user_override(uc_fw);
+
+ __uc_fw_fake_failures(uc_fw, i915, false);
+ __uc_fw_fake_failures(uc_fw, i915, true);
+ }
if (uc_fw->path && *uc_fw->path)
uc_fw->status = INTEL_UC_FIRMWARE_SELECTED;
@@ -221,17 +273,19 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
GEM_BUG_ON(!intel_uc_fw_supported(uc_fw));
+ err = i915_inject_load_error(i915, -ENXIO);
+ if (err)
+ return err;
+
err = request_firmware(&fw, uc_fw->path, i915->drm.dev);
if (err)
goto fail;
- DRM_DEBUG_DRIVER("%s fw size %zu ptr %p\n",
- intel_uc_fw_type_repr(uc_fw->type), fw->size, fw);
-
/* Check the size of the blob before examining buffer contents */
- if (fw->size < sizeof(struct uc_css_header)) {
- DRM_WARN("%s: Unexpected firmware size (%zu, min %zu)\n",
- intel_uc_fw_type_repr(uc_fw->type),
+ if (unlikely(fw->size < sizeof(struct uc_css_header))) {
+ dev_warn(i915->drm.dev,
+ "%s firmware %s: invalid size: %zu < %zu\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
fw->size, sizeof(struct uc_css_header));
err = -ENODATA;
goto fail;
@@ -242,10 +296,12 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
/* Check integrity of size values inside CSS header */
size = (css->header_size_dw - css->key_size_dw - css->modulus_size_dw -
css->exponent_size_dw) * sizeof(u32);
- if (size != sizeof(struct uc_css_header)) {
- DRM_WARN("%s: Mismatched firmware header definition\n",
- intel_uc_fw_type_repr(uc_fw->type));
- err = -ENOEXEC;
+ if (unlikely(size != sizeof(struct uc_css_header))) {
+ dev_warn(i915->drm.dev,
+ "%s firmware %s: unexpected header size: %zu != %zu\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
+ fw->size, sizeof(struct uc_css_header));
+ err = -EPROTO;
goto fail;
}
@@ -253,19 +309,23 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
uc_fw->ucode_size = (css->size_dw - css->header_size_dw) * sizeof(u32);
/* now RSA */
- if (css->key_size_dw != UOS_RSA_SCRATCH_COUNT) {
- DRM_WARN("%s: Mismatched firmware RSA key size (%u)\n",
- intel_uc_fw_type_repr(uc_fw->type), css->key_size_dw);
- err = -ENOEXEC;
+ if (unlikely(css->key_size_dw != UOS_RSA_SCRATCH_COUNT)) {
+ dev_warn(i915->drm.dev,
+ "%s firmware %s: unexpected RSA key size: %u != %u\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
+ css->key_size_dw, UOS_RSA_SCRATCH_COUNT);
+ err = -EPROTO;
goto fail;
}
uc_fw->rsa_size = css->key_size_dw * sizeof(u32);
/* At least, it should have header, uCode and RSA. Size of all three. */
size = sizeof(struct uc_css_header) + uc_fw->ucode_size + uc_fw->rsa_size;
- if (fw->size < size) {
- DRM_WARN("%s: Truncated firmware (%zu, expected %zu)\n",
- intel_uc_fw_type_repr(uc_fw->type), fw->size, size);
+ if (unlikely(fw->size < size)) {
+ dev_warn(i915->drm.dev,
+ "%s firmware %s: invalid size: %zu < %zu\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
+ fw->size, size);
err = -ENOEXEC;
goto fail;
}
@@ -291,45 +351,49 @@ int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
break;
}
- DRM_DEBUG_DRIVER("%s fw version %u.%u (wanted %u.%u)\n",
- intel_uc_fw_type_repr(uc_fw->type),
- uc_fw->major_ver_found, uc_fw->minor_ver_found,
- uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);
-
- if (uc_fw->major_ver_wanted == 0 && uc_fw->minor_ver_wanted == 0) {
- DRM_NOTE("%s: Skipping firmware version check\n",
- intel_uc_fw_type_repr(uc_fw->type));
- } else if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
- uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
- DRM_NOTE("%s: Wrong firmware version (%u.%u, required %u.%u)\n",
- intel_uc_fw_type_repr(uc_fw->type),
+ if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
+ uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
+ dev_warn(i915->drm.dev,
+ "%s firmware %s: unexpected version: %u.%u != %u.%u\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
uc_fw->major_ver_found, uc_fw->minor_ver_found,
uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);
- err = -ENOEXEC;
- goto fail;
+ if (!intel_uc_fw_is_overridden(uc_fw)) {
+ err = -ENOEXEC;
+ goto fail;
+ }
}
obj = i915_gem_object_create_shmem_from_data(i915, fw->data, fw->size);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
- DRM_DEBUG_DRIVER("%s fw object_create err=%d\n",
- intel_uc_fw_type_repr(uc_fw->type), err);
goto fail;
}
+ err = i915_inject_load_error(i915, -ENOMEM);
+ if (err)
+ goto fail;
+
uc_fw->obj = obj;
uc_fw->size = fw->size;
uc_fw->status = INTEL_UC_FIRMWARE_AVAILABLE;
+ DRM_DEV_DEBUG_DRIVER(i915->drm.dev, "%s firmware %s: %s\n",
+ intel_uc_fw_type_repr(uc_fw->type), uc_fw->path,
+ intel_uc_fw_status_repr(uc_fw->status));
+
release_firmware(fw);
return 0;
fail:
- uc_fw->status = INTEL_UC_FIRMWARE_MISSING;
+ if (err == -ENOENT)
+ uc_fw->status = INTEL_UC_FIRMWARE_MISSING;
+ else
+ uc_fw->status = INTEL_UC_FIRMWARE_ERROR;
- DRM_WARN("%s: Failed to fetch firmware %s (error %d)\n",
+ dev_info(i915->drm.dev, "%s firmware %s: fetch failed with error %d\n",
intel_uc_fw_type_repr(uc_fw->type), uc_fw->path, err);
- DRM_INFO("%s: Firmware can be downloaded from %s\n",
+ dev_info(i915->drm.dev, "%s firmware(s) can be downloaded from %s\n",
intel_uc_fw_type_repr(uc_fw->type), INTEL_UC_FIRMWARE_URL);
release_firmware(fw); /* OK even if fw is NULL */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
index 4c6541b85b43..76846be8b98c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
@@ -41,6 +41,7 @@ enum intel_uc_fw_status {
INTEL_UC_FIRMWARE_UNINITIALIZED = 0, /* used to catch checks done too early */
INTEL_UC_FIRMWARE_SELECTED, /* selected the blob we want to load */
INTEL_UC_FIRMWARE_MISSING, /* blob not found on the system */
+ INTEL_UC_FIRMWARE_ERROR, /* invalid format or version */
INTEL_UC_FIRMWARE_AVAILABLE, /* blob found and copied in mem */
INTEL_UC_FIRMWARE_FAIL, /* failed to xfer or init/auth the fw */
INTEL_UC_FIRMWARE_TRANSFERRED, /* dma xfer done */
@@ -91,6 +92,8 @@ const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
return "SELECTED";
case INTEL_UC_FIRMWARE_MISSING:
return "MISSING";
+ case INTEL_UC_FIRMWARE_ERROR:
+ return "ERROR";
case INTEL_UC_FIRMWARE_AVAILABLE:
return "AVAILABLE";
case INTEL_UC_FIRMWARE_FAIL:
--
2.19.2
More information about the Intel-gfx-trybot
mailing list