lkml.org 
[lkml]   [2021]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] drm/amdgpu: fix out of bounds write
From
Date
On 10/27/21 8:22 AM, Harry Wentland wrote:
> On 2021-10-27 10:39, Guenter Roeck wrote:
>> On Wed, Oct 13, 2021 at 04:04:13PM -0400, Thelford Williams wrote:
>>> Size can be any value and is user controlled resulting in overwriting the
>>> 40 byte array wr_buf with an arbitrary length of data from buf.
>>>
>>> Signed-off-by: Thelford Williams <tdwilliamsiv@gmail.com>
>>> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>>
>> The fix works, but unless I am missing something it is incomplete.
>> parse_write_buffer_into_params() is called several times, and the
>> size parameter is always wrong. This patch only fixes one of several
>> instances of the problem.
>>
>
> Patrik sent a patch that covers all cases:
> https://patchwork.freedesktop.org/patch/461554/?series=96341&rev=2
>
> Harry
>
Thanks!

Guenter

>> Guenter
>>
>>> ---
>>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
>>> index 814f67d86a3c..9b3ad56607bb 100644
>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
>>> @@ -264,7 +264,7 @@ static ssize_t dp_link_settings_write(struct file *f, const char __user *buf,
>>> if (!wr_buf)
>>> return -ENOSPC;
>>>
>>> - if (parse_write_buffer_into_params(wr_buf, size,
>>> + if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
>>> (long *)param, buf,
>>> max_param_num,
>>> &param_nums)) {
>>> --
>>> 2.33.0
>

\
 
 \ /
  Last update: 2021-10-27 18:00    [W:0.039 / U:1.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site