From: Jiri Kosina <[email protected]>
In case when psp_init_asd_microcode() fails to load ASD microcode file,
psp_v12_0_init_microcode() tries to print the firmware filename that
failed to load before bailing out.
This is wrong because:
- the firmware filename it would want it print is an incorrect one as
psp_init_asd_microcode() and psp_v12_0_init_microcode() are loading
different filenames
- it tries to print fw_name, but that's not yet been initialized by that
time, so it prints random stack contents, e.g.
amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_asd.bin failed with error -2
amdgpu 0000:04:00.0: amdgpu: fail to initialize asd microcode
amdgpu 0000:04:00.0: amdgpu: psp v12.0: Failed to load firmware "\xfeTO\x8e\xff\xff"
Fix that by bailing out immediately, instead of priting the bogus error
message.
Reported-by: Vojtech Pavlik <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
---
v1 -> v2: remove now-unused label
drivers/gpu/drm/amd/amdgpu/psp_v12_0.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
index c4828bd3264b..b0ee77ee80b9 100644
--- a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
@@ -67,7 +67,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
err = psp_init_asd_microcode(psp, chip_name);
if (err)
- goto out;
+ return err;
snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_ta.bin", chip_name);
err = request_firmware(&adev->psp.ta_fw, fw_name, adev->dev);
@@ -80,7 +80,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
} else {
err = amdgpu_ucode_validate(adev->psp.ta_fw);
if (err)
- goto out2;
+ goto out;
ta_hdr = (const struct ta_firmware_header_v1_0 *)
adev->psp.ta_fw->data;
@@ -105,10 +105,9 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
return 0;
-out2:
+out:
release_firmware(adev->psp.ta_fw);
adev->psp.ta_fw = NULL;
-out:
if (err) {
dev_err(adev->dev,
"psp v12.0: Failed to load firmware \"%s\"\n",
--
2.12.3
On Thu, 24 Jun 2021, Jiri Kosina wrote:
> From: Jiri Kosina <[email protected]>
>
> In case when psp_init_asd_microcode() fails to load ASD microcode file,
> psp_v12_0_init_microcode() tries to print the firmware filename that
> failed to load before bailing out.
>
> This is wrong because:
>
> - the firmware filename it would want it print is an incorrect one as
> psp_init_asd_microcode() and psp_v12_0_init_microcode() are loading
> different filenames
> - it tries to print fw_name, but that's not yet been initialized by that
> time, so it prints random stack contents, e.g.
>
> amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_asd.bin failed with error -2
> amdgpu 0000:04:00.0: amdgpu: fail to initialize asd microcode
> amdgpu 0000:04:00.0: amdgpu: psp v12.0: Failed to load firmware "\xfeTO\x8e\xff\xff"
>
> Fix that by bailing out immediately, instead of priting the bogus error
> message.
Friendly ping on this one too; priting a few bytes of stack is not a
*huge* info leak, but I believe it should be fixed nevertheless.
Thanks.
>
> Reported-by: Vojtech Pavlik <[email protected]>
> Signed-off-by: Jiri Kosina <[email protected]>
> ---
>
> v1 -> v2: remove now-unused label
>
> drivers/gpu/drm/amd/amdgpu/psp_v12_0.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> index c4828bd3264b..b0ee77ee80b9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> @@ -67,7 +67,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
>
> err = psp_init_asd_microcode(psp, chip_name);
> if (err)
> - goto out;
> + return err;
>
> snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_ta.bin", chip_name);
> err = request_firmware(&adev->psp.ta_fw, fw_name, adev->dev);
> @@ -80,7 +80,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
> } else {
> err = amdgpu_ucode_validate(adev->psp.ta_fw);
> if (err)
> - goto out2;
> + goto out;
>
> ta_hdr = (const struct ta_firmware_header_v1_0 *)
> adev->psp.ta_fw->data;
> @@ -105,10 +105,9 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
>
> return 0;
>
> -out2:
> +out:
> release_firmware(adev->psp.ta_fw);
> adev->psp.ta_fw = NULL;
> -out:
> if (err) {
> dev_err(adev->dev,
> "psp v12.0: Failed to load firmware \"%s\"\n",
> --
> 2.12.3
>
--
Jiri Kosina
SUSE Labs
Applied. Thanks!
Alex
On Thu, Jul 1, 2021 at 4:33 AM Jiri Kosina <[email protected]> wrote:
>
> On Thu, 24 Jun 2021, Jiri Kosina wrote:
>
> > From: Jiri Kosina <[email protected]>
> >
> > In case when psp_init_asd_microcode() fails to load ASD microcode file,
> > psp_v12_0_init_microcode() tries to print the firmware filename that
> > failed to load before bailing out.
> >
> > This is wrong because:
> >
> > - the firmware filename it would want it print is an incorrect one as
> > psp_init_asd_microcode() and psp_v12_0_init_microcode() are loading
> > different filenames
> > - it tries to print fw_name, but that's not yet been initialized by that
> > time, so it prints random stack contents, e.g.
> >
> > amdgpu 0000:04:00.0: Direct firmware load for amdgpu/renoir_asd.bin failed with error -2
> > amdgpu 0000:04:00.0: amdgpu: fail to initialize asd microcode
> > amdgpu 0000:04:00.0: amdgpu: psp v12.0: Failed to load firmware "\xfeTO\x8e\xff\xff"
> >
> > Fix that by bailing out immediately, instead of priting the bogus error
> > message.
>
> Friendly ping on this one too; priting a few bytes of stack is not a
> *huge* info leak, but I believe it should be fixed nevertheless.
>
> Thanks.
>
> >
> > Reported-by: Vojtech Pavlik <[email protected]>
> > Signed-off-by: Jiri Kosina <[email protected]>
>
>
> > ---
> >
> > v1 -> v2: remove now-unused label
> >
> > drivers/gpu/drm/amd/amdgpu/psp_v12_0.c | 7 +++----
> > 1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> > index c4828bd3264b..b0ee77ee80b9 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/psp_v12_0.c
> > @@ -67,7 +67,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
> >
> > err = psp_init_asd_microcode(psp, chip_name);
> > if (err)
> > - goto out;
> > + return err;
> >
> > snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_ta.bin", chip_name);
> > err = request_firmware(&adev->psp.ta_fw, fw_name, adev->dev);
> > @@ -80,7 +80,7 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
> > } else {
> > err = amdgpu_ucode_validate(adev->psp.ta_fw);
> > if (err)
> > - goto out2;
> > + goto out;
> >
> > ta_hdr = (const struct ta_firmware_header_v1_0 *)
> > adev->psp.ta_fw->data;
> > @@ -105,10 +105,9 @@ static int psp_v12_0_init_microcode(struct psp_context *psp)
> >
> > return 0;
> >
> > -out2:
> > +out:
> > release_firmware(adev->psp.ta_fw);
> > adev->psp.ta_fw = NULL;
> > -out:
> > if (err) {
> > dev_err(adev->dev,
> > "psp v12.0: Failed to load firmware \"%s\"\n",
> > --
> > 2.12.3
> >
>
> --
> Jiri Kosina
> SUSE Labs
>
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