Re: [PATCH] hwrng: core - Add WARN_ON for buggy read return values

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On Fri, 2024-09-27 at 08:42 +0800, Herbert Xu wrote:
> On Tue, Sep 24, 2024 at 08:43:00PM +0300, Jarkko Sakkinen wrote:
> > 
> > Without any traces that would provide more information I don't see
> > the smoking gun.
> 
> I haven't confirmed that it's definitely the tpm2 driver, it's just
> based on the backtrace.  Hopefully my patch will confirm it one way
> or the other.  Here is the backtrace:

Agreed.

> 
> [  100.784159] vmd 0000:c2:00.5: Bound to PCI domain 10002 
> [  100.786209] Monitor-Mwait will be used to enter C-1 state 
> [  100.786225] Monitor-Mwait will be used to enter C-2 state 
> [  100.786244] ACPI: \_SB_.SCK0.C000: Found 2 idle states 
> [  100.823093] input: Power Button as
> /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 
> [  100.823636] ACPI: button: Power Button [PWRF] 
> [  100.905756] ERST: Error Record Serialization Table (ERST) support
> is initialized. 
> [  100.905858] pstore: Using crash dump compression: deflate 
> [  100.905861] pstore: Registered erst as persistent store backend 
> [  100.907044] Serial: 8250/16550 driver, 4 ports, IRQ sharing
> enabled 
> [  100.908305] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud =
> 115200) is a 16550A 
> [  100.926608] 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud =
> 115200) is a 16550A 
> [  100.942953] Non-volatile memory driver v1.3 
> [  100.947908] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1B, rev-id
> 22) 
> [  101.226913] ACPI: bus type drm_connector registered 
> [  101.229708] alg: ecdh-nist-p256 (ecdh-nist-p256-generic) is
> disabled due to FIPS 
> [  101.229745] tpm tpm0: crypto ecdh allocation failed 
> [  101.236311] tpm tpm0: A TPM error (708) occurred start auth

I guess it is TPM2_StartAuthSession returning TPM_RC_VALUE. Probably
James should look into this as the bus encryption code is clearly
tripping here.

I'm on second week on a new job so cannot promise any bandwidth
yet this week. Earliest next week...

BR, Jarkko





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