On Tue, Feb 02, 2021 at 04:51:39PM +0100, Lukasz Majczak wrote: > There are missing calls to tpm_request_locality before the calls to > the tpm_get_timeouts() and tpm_tis_probe_irq_single() - both functions > internally send commands to the tpm. As the current > approach might work for tpm2, it fails for tpm1.x - in that case > call to tpm_get_timeouts() or tpm_tis_probe_irq_single() > without acquired locality fails and in turn causes tpm_tis_core_init() > to fail, it can be observed in the log with the following warning > trace: I said earlier about proper capitalizations of the acronyms. E.g. "tpm1.x" has no meaning. TPM 1.x has. There's also a few other similar examples. > > [ 4.324298] TPM returned invalid status > [ 4.324806] WARNING: CPU: 2 PID: 1 at drivers/char/tpm/tpm_tis_core.c:275 tpm_tis_status+0x86/0x8f To make the commit message shorter you could snip from here. > [ 4.325888] Modules linked in: > [ 4.326287] CPU: 2 PID: 1 Comm: swapper/0 Tainted: G W 5.11.0-rc6-next-20210201-00003-g214461adb2e8 #43 > [ 4.327406] Hardware name: Google Caroline/Caroline, BIOS Google_Caroline.7820.430.0 07/20/2018 > [ 4.327918] RIP: 0010:tpm_tis_status+0x86/0x8f > [ 4.328323] Code: 28 00 00 00 48 3b 45 f0 75 24 89 d8 48 83 c4 10 5b 5d c3 c6 05 58 d9 28 01 01 31 db 48 c7 c7 73 52 98 9c 31 c0 e8 c2 17 b0 ff <0f> 0b eb cd e8 cf 4f 55 00 0f 1f 44 00 00 55 48 89 e56 > [ 4.330592] RSP: 0000:ffff88810092f7a0 EFLAGS: 00010246 > [ 4.331223] RAX: 691ee151166db100 RBX: 0000000000000000 RCX: 0000000000000001 > [ 4.331860] RDX: 0000000000000006 RSI: ffffffff9c96d302 RDI: 00000000ffffffff > [ 4.332272] RBP: ffff88810092f7b8 R08: dffffc0000000000 R09: fffffbfff39c96ce > [ 4.332683] R10: fffffbfff39c96ce R11: 0000000000000001 R12: ffff8881053e2000 > [ 4.333109] R13: 0000000065000000 R14: ffff888105d71000 R15: ffff888105cd2628 > [ 4.333738] FS: 0000000000000000(0000) GS:ffff88842f200000(0000) knlGS:0000000000000000 > [ 4.334432] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 4.334783] CR2: 0000000000000000 CR3: 0000000037828001 CR4: 00000000003706e0 > [ 4.335196] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 4.335886] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 4.336793] Call Trace: > [ 4.337107] tpm_tis_send_data+0x3d/0x22f > [ 4.337506] tpm_tis_send_main+0x30/0xf5 > [ 4.337746] tpm_transmit+0xbf/0x327 > [ 4.338042] ? __alloc_pages_nodemask+0x261/0x36d > [ 4.338615] tpm_transmit_cmd+0x2c/0x93 > [ 4.339109] tpm1_getcap+0x232/0x285 > [ 4.339578] tpm1_get_timeouts+0x48/0x47d > [ 4.339964] ? lockdep_init_map_type+0x71/0x257 > [ 4.340256] ? lockdep_init_map_type+0x71/0x257 > [ 4.340719] ? __raw_spin_lock_init+0x40/0x69 > [ 4.341208] tpm_tis_core_init+0x402/0x5ee > [ 4.341629] tpm_tis_init+0x11d/0x1a2 > [ 4.341867] tpm_tis_pnp_init+0x91/0xb5 > [ 4.342101] ? tis_int_handler+0x15f/0x15f > [ 4.342466] pnp_device_probe+0x79/0x9f > [ 4.342941] really_probe+0x149/0x4a8 > [ 4.343412] driver_probe_device+0xd6/0x144 > [ 4.343968] device_driver_attach+0x42/0x5b > [ 4.344382] __driver_attach+0xca/0x139 > [ 4.344617] ? driver_attach+0x1f/0x1f > [ 4.344860] bus_for_each_dev+0x85/0xb7 > [ 4.345096] bus_add_driver+0x12b/0x228 > [ 4.345330] driver_register+0x64/0xed > [ 4.345560] init_tis+0xa5/0xeb > [ 4.345784] ? lock_is_held_type+0x100/0x141 > [ 4.346044] ? tpm_init+0x106/0x106 > [ 4.346259] ? rcu_read_lock_sched_held+0x41/0x7e > [ 4.346542] ? tpm_init+0x106/0x106 > [ 4.346678] battery: ACPI: Battery Slot [BAT0] (battery present) > [ 4.346754] do_one_initcall+0x1b9/0x43d > [ 4.346776] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 > [ 4.347659] ? lockdep_hardirqs_on+0x8e/0x12e > [ 4.347937] ? lock_is_held_type+0x100/0x141 > [ 4.348196] ? rcu_read_lock_sched_held+0x41/0x7e > [ 4.348477] do_initcall_level+0x99/0xa9 > [ 4.348717] ? kernel_init+0xe/0x10a > [ 4.348954] do_initcalls+0x4e/0x79 > [ 4.349170] kernel_init_freeable+0x15a/0x1ae > [ 4.349434] ? rest_init+0x1d6/0x1d6 > [ 4.349655] kernel_init+0xe/0x10a > [ 4.349882] ret_from_fork+0x22/0x30 > [ 4.350103] irq event stamp: 700039 > [ 4.350318] hardirqs last enabled at (700047): [<ffffffff9b735265>] console_unlock+0x4be/0x538 > [ 4.350836] hardirqs last disabled at (700056): [<ffffffff9b734e84>] console_unlock+0xdd/0x538 > [ 4.351331] softirqs last enabled at (699522): [<ffffffff9c4004ec>] __do_softirq+0x4ec/0x539 > [ 4.351835] softirqs last disabled at (699517): [<ffffffff9c200f62>] asm_call_irq_on_stack+0x12/0x20 > > Following the trace one can also notice a comment in the tpm_tis_status(): > > /* > * If this trips, the chances are the read is > * returning 0xff because the locality hasn't been > * acquired. Usually because tpm_try_get_ops() hasn't > * been called before doing a TPM operation. > */ > In this case we don't have to call tpm_try_get_ops() Do not use "we". Write in imperative term. > as both calls (tpm_get_timeouts() and tpm_tis_probe_irq_single()) are > in the tpm_tis_core_init function and don't require any locking or clock > enablement. Similar usage is in the probe_itpm() function also called > inside tpm_tis_core_init(). You use parentheses incosistently here. E.g. tpm_tis_core_init has them in some sentences, and in some it doesn't. > Tested on Samsung Chromebook Pro (Caroline). > > Signed-off-by: Lukasz Majczak <lma@xxxxxxxxxxxx> > --- > Hi Jarkko > > I have checked the linux-next with James patches, also followed Dirk > suggestion applying remaining ones, although without any luck - > a warning trace was still present. As Guneter mentioned earlier, this > patch[1] doesn't address a lack of acquired locality in the > tpm_get_timeouts() and does it only for tpm_tis_probe_irq_single() but > also without a call to tpm_relinquish_locality(). > > Here are my logs from the clean linux-next master branch [2] > (with two James' patches present) and with my > patch applied[3] > > Best regards, > Lukasz Ok. Please also take care fixing the cosmetic things, which you clearly haven't done (like writing acronyms correctly). > [1] https://lore.kernel.org/linux-integrity/20201001180925.13808-5-James.Bottomley@xxxxxxxxxxxxxxxxxxxxx/ > [2] https://gist.github.com/semihalf-majczak-lukasz/f588c0684a6cc7d983bb9c4eb4bda586 > [3] https://gist.github.com/semihalf-majczak-lukasz/88ede933bc7d28d806e3532850a04054 > > v2 -> v3: > - Added braces around if part of if/else statements > - Rebased to linux-next > - Updated commit message > > drivers/char/tpm/tpm-chip.c | 4 ++-- > drivers/char/tpm/tpm-interface.c | 13 ++++++++++--- > drivers/char/tpm/tpm.h | 2 ++ > drivers/char/tpm/tpm_tis_core.c | 14 +++++++++++--- > 4 files changed, 25 insertions(+), 8 deletions(-) > > diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c > index ddaeceb7e109..5351963a4b19 100644 > --- a/drivers/char/tpm/tpm-chip.c > +++ b/drivers/char/tpm/tpm-chip.c > @@ -32,7 +32,7 @@ struct class *tpm_class; > struct class *tpmrm_class; > dev_t tpm_devt; > > -static int tpm_request_locality(struct tpm_chip *chip) > +int tpm_request_locality(struct tpm_chip *chip) > { > int rc; > > @@ -47,7 +47,7 @@ static int tpm_request_locality(struct tpm_chip *chip) > return 0; > } > > -static void tpm_relinquish_locality(struct tpm_chip *chip) > +void tpm_relinquish_locality(struct tpm_chip *chip) > { > int rc; You need to export the symbols. > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c > index 1621ce818705..2a9001d329f2 100644 > --- a/drivers/char/tpm/tpm-interface.c > +++ b/drivers/char/tpm/tpm-interface.c > @@ -241,10 +241,17 @@ int tpm_get_timeouts(struct tpm_chip *chip) > if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS) > return 0; > > - if (chip->flags & TPM_CHIP_FLAG_TPM2) > + if (chip->flags & TPM_CHIP_FLAG_TPM2) { > return tpm2_get_timeouts(chip); > - else > - return tpm1_get_timeouts(chip); > + } else { > + ssize_t ret = tpm_request_locality(chip); > + > + if (ret) > + return ret; > + ret = tpm1_get_timeouts(chip); > + tpm_relinquish_locality(chip); > + return ret; > + } > } > EXPORT_SYMBOL_GPL(tpm_get_timeouts); > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index 947d1db0a5cc..8c13008437dd 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -193,6 +193,8 @@ static inline void tpm_msleep(unsigned int delay_msec) > > int tpm_chip_start(struct tpm_chip *chip); > void tpm_chip_stop(struct tpm_chip *chip); > +int tpm_request_locality(struct tpm_chip *chip); > +void tpm_relinquish_locality(struct tpm_chip *chip); > struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip); > __must_check int tpm_try_get_ops(struct tpm_chip *chip); > void tpm_put_ops(struct tpm_chip *chip); > diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c > index 431919d5f48a..d4f381d6356e 100644 > --- a/drivers/char/tpm/tpm_tis_core.c > +++ b/drivers/char/tpm/tpm_tis_core.c > @@ -708,11 +708,19 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip) > u32 cap2; > cap_t cap; > > - if (chip->flags & TPM_CHIP_FLAG_TPM2) > + if (chip->flags & TPM_CHIP_FLAG_TPM2) { > return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); > - else > - return tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, > + } else { > + ssize_t ret = tpm_request_locality(chip); > + > + if (ret) > + return ret; > + ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, > 0); > + tpm_relinquish_locality(chip); > + return ret; > + } Why this and nost just call tpm_chip_start()? > + > } > > /* Register the IRQ and issue a command that will cause an interrupt. If an > -- > 2.25.1 > > /Jarkko
