Re: [Intel-gfx] [PATCH 5/6] drm/i915/uc: Reject duplicate entries in firmware table

[Ceraolo Spurio, Daniele]

On 4/20/2023 6:15 PM, john.c.harri...@intel.com wrote:

From: John Harrison 

It was noticed that duplicate entries in the firmware table could cause
an infinite loop in the firmware loading code if that entry failed to
load. Duplicate entries are a bug anyway and so should never happen.
Ensure they don't by tweaking the table validation code to reject
duplicates.

For full m/m/p files, that can be done by simply tweaking the patch
level check to reject matching values. For reduced version entries,
the filename itself must be compared.

Signed-off-by: John Harrison 
---
  drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 27 +---
  1 file changed, 24 insertions(+), 3 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 eb52e8db9ae0b..bc4011d55667c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -319,7 +319,7 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
  {
const struct uc_fw_platform_requirement *fw_blobs;
u32 fw_count;
-   int i;
+   int i, j;
  
  	if (type >= ARRAY_SIZE(blobs_all)) {

drm_err(>drm, "No blob array for %s\n", 
intel_uc_fw_type_repr(type));
@@ -334,6 +334,27 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
  
  	/* make sure the list is ordered as expected */

for (i = 1; i < fw_count; i++) {
+   /* Versionless file names must be unique per platform: */
+   for (j = i + 1; j < fw_count; j++) {
+   /* Same platform? */
+   if (fw_blobs[i].p != fw_blobs[j].p)
+   continue;
+
+   if (fw_blobs[i].blob.path != fw_blobs[j].blob.path)
+   continue;
+
+   drm_err(>drm, "Diplicaate %s blobs: %s r%u %s%d.%d.%d 
[%s] matches %s r%u %s%d.%d.%d [%s]\n",


typo Diplicaate


+   intel_uc_fw_type_repr(type),
+   intel_platform_name(fw_blobs[j].p), 
fw_blobs[j].rev,
+   fw_blobs[j].blob.legacy ? "L" : "v",
+   fw_blobs[j].blob.major, fw_blobs[j].blob.minor,
+   fw_blobs[j].blob.patch, fw_blobs[j].blob.path,
+   intel_platform_name(fw_blobs[i].p), 
fw_blobs[i].rev,


nit: we could avoid printing the platform twice because you're 
explicitly checking that it is the same earlier on. Not a blocked.

With the typo fixed:

Reviewed-by: Daniele Ceraolo Spurio 

Daniele


+   fw_blobs[i].blob.legacy ? "L" : "v",
+   fw_blobs[i].blob.major, fw_blobs[i].blob.minor,
+   fw_blobs[i].blob.patch, fw_blobs[i].blob.path);
+   }
+
/* Next platform is good: */
if (fw_blobs[i].p < fw_blobs[i - 1].p)
continue;
@@ -377,8 +398,8 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
if (fw_blobs[i].blob.minor != fw_blobs[i - 1].blob.minor)
goto bad;
  
-		/* Patch versions must be in order: */

-   if (fw_blobs[i].blob.patch <= fw_blobs[i - 1].blob.patch)
+   /* Patch versions must be in order and unique: */
+   if (fw_blobs[i].blob.patch < fw_blobs[i - 1].blob.patch)
continue;
  
  bad:

[Intel-gfx] [PATCH 5/6] drm/i915/uc: Reject duplicate entries in firmware table

[John . C . Harrison]

From: John Harrison 

It was noticed that duplicate entries in the firmware table could cause
an infinite loop in the firmware loading code if that entry failed to
load. Duplicate entries are a bug anyway and so should never happen.
Ensure they don't by tweaking the table validation code to reject
duplicates.

For full m/m/p files, that can be done by simply tweaking the patch
level check to reject matching values. For reduced version entries,
the filename itself must be compared.

Signed-off-by: John Harrison 
---
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 27 +---
 1 file changed, 24 insertions(+), 3 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 eb52e8db9ae0b..bc4011d55667c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -319,7 +319,7 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
 {
const struct uc_fw_platform_requirement *fw_blobs;
u32 fw_count;
-   int i;
+   int i, j;
 
if (type >= ARRAY_SIZE(blobs_all)) {
drm_err(>drm, "No blob array for %s\n", 
intel_uc_fw_type_repr(type));
@@ -334,6 +334,27 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
 
/* make sure the list is ordered as expected */
for (i = 1; i < fw_count; i++) {
+   /* Versionless file names must be unique per platform: */
+   for (j = i + 1; j < fw_count; j++) {
+   /* Same platform? */
+   if (fw_blobs[i].p != fw_blobs[j].p)
+   continue;
+
+   if (fw_blobs[i].blob.path != fw_blobs[j].blob.path)
+   continue;
+
+   drm_err(>drm, "Diplicaate %s blobs: %s r%u 
%s%d.%d.%d [%s] matches %s r%u %s%d.%d.%d [%s]\n",
+   intel_uc_fw_type_repr(type),
+   intel_platform_name(fw_blobs[j].p), 
fw_blobs[j].rev,
+   fw_blobs[j].blob.legacy ? "L" : "v",
+   fw_blobs[j].blob.major, fw_blobs[j].blob.minor,
+   fw_blobs[j].blob.patch, fw_blobs[j].blob.path,
+   intel_platform_name(fw_blobs[i].p), 
fw_blobs[i].rev,
+   fw_blobs[i].blob.legacy ? "L" : "v",
+   fw_blobs[i].blob.major, fw_blobs[i].blob.minor,
+   fw_blobs[i].blob.patch, fw_blobs[i].blob.path);
+   }
+
/* Next platform is good: */
if (fw_blobs[i].p < fw_blobs[i - 1].p)
continue;
@@ -377,8 +398,8 @@ static bool validate_fw_table_type(struct drm_i915_private 
*i915, enum intel_uc_
if (fw_blobs[i].blob.minor != fw_blobs[i - 1].blob.minor)
goto bad;
 
-   /* Patch versions must be in order: */
-   if (fw_blobs[i].blob.patch <= fw_blobs[i - 1].blob.patch)
+   /* Patch versions must be in order and unique: */
+   if (fw_blobs[i].blob.patch < fw_blobs[i - 1].blob.patch)
continue;
 
 bad:
-- 
2.39.1