[PATCH] drm/amd/amdgpu: Fix amdgpu_debugfs_gpr_read debugfs entry

[Christian König]

>
>   -    if (size & 3 || *pos & 3)
> +    if (size & 3 || size > (4 * AMDGPU_DEBUGFS_MAX_SGPR_READ)) 

I think checking the position alignment here is still necessary, cause 
we can't read from not dw boundaries don't we?

Christian.

Am 11.04.2018 um 13:55 schrieb Tom St Denis:
> Ping?
>
> On 04/09/2018 08:16 AM, Tom St Denis wrote:
>> We don't need to check the alignment of the offset and there was
>> potential a buffer overflow as well.
>>
>> Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 8 ++++++--
>>   1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> index c98e59721444..b1ea300008e5 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>> @@ -507,6 +507,9 @@ static ssize_t amdgpu_debugfs_wave_read(struct 
>> file *f, char __user *buf,
>>       return result;
>>   }
>>   +// read at most 1024 words
>> +#define AMDGPU_DEBUGFS_MAX_SGPR_READ 1024
>> +
>>   static ssize_t amdgpu_debugfs_gpr_read(struct file *f, char __user 
>> *buf,
>>                       size_t size, loff_t *pos)
>>   {
>> @@ -515,7 +518,7 @@ static ssize_t amdgpu_debugfs_gpr_read(struct 
>> file *f, char __user *buf,
>>       ssize_t result = 0;
>>       uint32_t offset, se, sh, cu, wave, simd, thread, bank, *data;
>>   -    if (size & 3 || *pos & 3)
>> +    if (size & 3 || size > (4 * AMDGPU_DEBUGFS_MAX_SGPR_READ))
>>           return -EINVAL;
>>         /* decode offset */
>> @@ -528,7 +531,8 @@ static ssize_t amdgpu_debugfs_gpr_read(struct 
>> file *f, char __user *buf,
>>       thread = (*pos & GENMASK_ULL(59, 52)) >> 52;
>>       bank = (*pos & GENMASK_ULL(61, 60)) >> 60;
>>   -    data = kmalloc_array(1024, sizeof(*data), GFP_KERNEL);
>> +    data = kmalloc_array(AMDGPU_DEBUGFS_MAX_SGPR_READ, sizeof(*data),
>> +                         GFP_KERNEL);
>>       if (!data)
>>           return -ENOMEM;
>>
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