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[1/3] tpm: Add a missing check for TPM_CHIP_FLAG_HWRNG_DISABLED

Message ID 20230803015015.915-2-mario.limonciello@amd.com
State New
Headers
Series More changes related to TPM RNG handling |

Commit Message

Mario Limonciello Aug. 3, 2023, 1:50 a.m. UTC 
  If the TPM is opted out of hwrng the error handling for
tpm_chip_register() needs to know this so it doesn't try to clean
up an uninitialized chip->hwrng.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/char/tpm/tpm-chip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Jarkko Sakkinen Aug. 3, 2023, 8:59 a.m. UTC | #1 
On Thu Aug 3, 2023 at 4:50 AM EEST, Mario Limonciello wrote:
> If the TPM is opted out of hwrng the error handling for
> tpm_chip_register() needs to know this so it doesn't try to clean
> up an uninitialized chip->hwrng.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>  drivers/char/tpm/tpm-chip.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index e904aae9771be..8f61b784810d6 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -629,7 +629,8 @@ int tpm_chip_register(struct tpm_chip *chip)
>  	return 0;
>  
>  out_hwrng:
> -	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
> +	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
> +	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
>  		hwrng_unregister(&chip->hwrng);
>  out_ppi:
>  	tpm_bios_log_teardown(chip);
> -- 
> 2.34.1

Please add a fixes tag.

BR, Jarkko
Mario Limonciello Aug. 3, 2023, 11:35 a.m. UTC | #2 
On 8/3/23 03:59, Jarkko Sakkinen wrote:
> On Thu Aug 3, 2023 at 4:50 AM EEST, Mario Limonciello wrote:
>> If the TPM is opted out of hwrng the error handling for
>> tpm_chip_register() needs to know this so it doesn't try to clean
>> up an uninitialized chip->hwrng.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
>> ---
>>   drivers/char/tpm/tpm-chip.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
>> index e904aae9771be..8f61b784810d6 100644
>> --- a/drivers/char/tpm/tpm-chip.c
>> +++ b/drivers/char/tpm/tpm-chip.c
>> @@ -629,7 +629,8 @@ int tpm_chip_register(struct tpm_chip *chip)
>>   	return 0;
>>   
>>   out_hwrng:
>> -	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
>> +	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
>> +	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
>>   		hwrng_unregister(&chip->hwrng);
>>   out_ppi:
>>   	tpm_bios_log_teardown(chip);
>> -- 
>> 2.34.1
> 
> Please add a fixes tag.
> 
> BR, Jarkko

I didn't add a fixes tag because you hadn't sent a PR for the other one 
yet so I wasn't sure the hash would be stable.  Also I thought it might 
just make sense to squash into it.

If the hash is now stable, could you just just commit and add that tag 
with it yourself?  Or do you want me to re-send as a v2 with that?
Jason A. Donenfeld Aug. 3, 2023, 1:50 p.m. UTC | #3 
On Thu, Aug 03, 2023 at 06:35:36AM -0500, Mario Limonciello wrote:
> On 8/3/23 03:59, Jarkko Sakkinen wrote:
> > On Thu Aug 3, 2023 at 4:50 AM EEST, Mario Limonciello wrote:
> >> If the TPM is opted out of hwrng the error handling for
> >> tpm_chip_register() needs to know this so it doesn't try to clean
> >> up an uninitialized chip->hwrng.
> >>
> >> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> >> ---
> >>   drivers/char/tpm/tpm-chip.c | 3 ++-
> >>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> >> index e904aae9771be..8f61b784810d6 100644
> >> --- a/drivers/char/tpm/tpm-chip.c
> >> +++ b/drivers/char/tpm/tpm-chip.c
> >> @@ -629,7 +629,8 @@ int tpm_chip_register(struct tpm_chip *chip)
> >>   	return 0;
> >>   
> >>   out_hwrng:
> >> -	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
> >> +	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
> >> +	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
> >>   		hwrng_unregister(&chip->hwrng);
> >>   out_ppi:
> >>   	tpm_bios_log_teardown(chip);
> >> -- 
> >> 2.34.1
> > 
> > Please add a fixes tag.
> > 
> > BR, Jarkko
> 
> I didn't add a fixes tag because you hadn't sent a PR for the other one 
> yet so I wasn't sure the hash would be stable.  Also I thought it might 
> just make sense to squash into it.
> 
> If the hash is now stable, could you just just commit and add that tag 
> with it yourself?  Or do you want me to re-send as a v2 with that?

What about just sending a v3 of the patch that this patch fixes? The
stable@/fixes tags in that are wrong/incomplete so Jarkko's tree will
need to be fixed before pushing to Linus anyway.

Jason
Jarkko Sakkinen Aug. 4, 2023, 10:52 p.m. UTC | #4 
On Thu Aug 3, 2023 at 4:50 PM EEST, Jason A. Donenfeld wrote:
> On Thu, Aug 03, 2023 at 06:35:36AM -0500, Mario Limonciello wrote:
> > On 8/3/23 03:59, Jarkko Sakkinen wrote:
> > > On Thu Aug 3, 2023 at 4:50 AM EEST, Mario Limonciello wrote:
> > >> If the TPM is opted out of hwrng the error handling for
> > >> tpm_chip_register() needs to know this so it doesn't try to clean
> > >> up an uninitialized chip->hwrng.
> > >>
> > >> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> > >> ---
> > >>   drivers/char/tpm/tpm-chip.c | 3 ++-
> > >>   1 file changed, 2 insertions(+), 1 deletion(-)
> > >>
> > >> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> > >> index e904aae9771be..8f61b784810d6 100644
> > >> --- a/drivers/char/tpm/tpm-chip.c
> > >> +++ b/drivers/char/tpm/tpm-chip.c
> > >> @@ -629,7 +629,8 @@ int tpm_chip_register(struct tpm_chip *chip)
> > >>   	return 0;
> > >>   
> > >>   out_hwrng:
> > >> -	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
> > >> +	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
> > >> +	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
> > >>   		hwrng_unregister(&chip->hwrng);
> > >>   out_ppi:
> > >>   	tpm_bios_log_teardown(chip);
> > >> -- 
> > >> 2.34.1
> > > 
> > > Please add a fixes tag.
> > > 
> > > BR, Jarkko
> > 
> > I didn't add a fixes tag because you hadn't sent a PR for the other one 
> > yet so I wasn't sure the hash would be stable.  Also I thought it might 
> > just make sense to squash into it.
> > 
> > If the hash is now stable, could you just just commit and add that tag 
> > with it yourself?  Or do you want me to re-send as a v2 with that?
>
> What about just sending a v3 of the patch that this patch fixes? The
> stable@/fixes tags in that are wrong/incomplete so Jarkko's tree will
> need to be fixed before pushing to Linus anyway.

Sounds reasonable. I can hold the PR to rc6 and send it on Monday.

BR, Jarkko
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e904aae9771be..8f61b784810d6 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -629,7 +629,8 @@  int tpm_chip_register(struct tpm_chip *chip)
 	return 0;
 
 out_hwrng:
-	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
+	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
+	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
 		hwrng_unregister(&chip->hwrng);
 out_ppi:
 	tpm_bios_log_teardown(chip);