If __calc_tpm2_event_size fails to parse an event it will return 0,
resulting tpm2_calc_event_log_size returning -1. Currently
there is no check of this return value, and efi_tpm_final_log_size
can end up being set to this negative value resulting
in a panic like the following:
[ 0.774340] BUG: unable to handle page fault for address: ffffbc8fc00866ad
[ 0.774788] #PF: supervisor read access in kernel mode
[ 0.774788] #PF: error_code(0x0000) - not-present page
[ 0.774788] PGD 107d36067 P4D 107d36067 PUD 107d37067 PMD 107d38067 PTE 0
[ 0.774788] Oops: 0000 [#1] SMP PTI
[ 0.774788] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.3.0-0.rc2.1.elrdy.x86_64 #1
[ 0.774788] Hardware name: LENOVO 20HGS22D0W/20HGS22D0W, BIOS N1WET51W (1.30 ) 09/14/2018
[ 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
[ 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
[ 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
[ 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
[ 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
[ 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
[ 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
[ 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
[ 0.774788] FS: 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
[ 0.774788] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
[ 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.774788] Call Trace:
[ 0.774788] tpm_read_log_efi+0x156/0x1a0
[ 0.774788] tpm_bios_log_setup+0xc8/0x190
[ 0.774788] tpm_chip_register+0x50/0x1c0
[ 0.774788] tpm_tis_core_init.cold.9+0x28c/0x466
[ 0.774788] tpm_tis_plat_probe+0xcc/0xea
[ 0.774788] platform_drv_probe+0x35/0x80
[ 0.774788] really_probe+0xef/0x390
[ 0.774788] driver_probe_device+0xb4/0x100
[ 0.774788] device_driver_attach+0x4f/0x60
[ 0.774788] __driver_attach+0x86/0x140
[ 0.774788] ? device_driver_attach+0x60/0x60
[ 0.774788] bus_for_each_dev+0x76/0xc0
[ 0.774788] ? klist_add_tail+0x3b/0x70
[ 0.774788] bus_add_driver+0x14a/0x1e0
[ 0.774788] ? tpm_init+0xea/0xea
[ 0.774788] ? do_early_param+0x8e/0x8e
[ 0.774788] driver_register+0x6b/0xb0
[ 0.774788] ? tpm_init+0xea/0xea
[ 0.774788] init_tis+0x86/0xd8
[ 0.774788] ? do_early_param+0x8e/0x8e
[ 0.774788] ? driver_register+0x94/0xb0
[ 0.774788] do_one_initcall+0x46/0x1e4
[ 0.774788] ? do_early_param+0x8e/0x8e
[ 0.774788] kernel_init_freeable+0x199/0x242
[ 0.774788] ? rest_init+0xaa/0xaa
[ 0.774788] kernel_init+0xa/0x106
[ 0.774788] ret_from_fork+0x35/0x40
[ 0.774788] Modules linked in:
[ 0.774788] CR2: ffffbc8fc00866ad
[ 0.774788] ---[ end trace 42930799f8d6eaea ]---
[ 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
[ 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
[ 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
[ 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
[ 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
[ 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
[ 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
[ 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
[ 0.774788] FS: 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
[ 0.774788] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
[ 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.774788] Kernel panic - not syncing: Fatal exception
[ 0.774788] Kernel Offset: 0x1d000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 0.774788] ---[ end Kernel panic - not syncing: Fatal exception ]---
Fixes: c46f3405692de ("tpm: Reserve the TPM final events table")
Cc: Matthew Garrett <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Signed-off-by: Jerry Snitselaar <[email protected]>
---
drivers/firmware/efi/tpm.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
index 1d3f5ca3eaaf..5cd00a7833c2 100644
--- a/drivers/firmware/efi/tpm.c
+++ b/drivers/firmware/efi/tpm.c
@@ -40,8 +40,7 @@ int __init efi_tpm_eventlog_init(void)
{
struct linux_efi_tpm_eventlog *log_tbl;
struct efi_tcg2_final_events_table *final_tbl;
- unsigned int tbl_size;
- int ret = 0;
+ int tbl_size, ret = 0;
if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
/*
@@ -80,11 +79,17 @@ int __init efi_tpm_eventlog_init(void)
+ sizeof(final_tbl->nr_events),
final_tbl->nr_events,
log_tbl->log);
+ if (tbl_size < 0) {
+ pr_err("Failed to parse event in TPM Final Event log\n");
+ goto calc_out;
+ }
+
memblock_reserve((unsigned long)final_tbl,
tbl_size + sizeof(*final_tbl));
- early_memunmap(final_tbl, sizeof(*final_tbl));
efi_tpm_final_log_size = tbl_size;
+calc_out:
+ early_memunmap(final_tbl, sizeof(*final_tbl));
out:
early_memunmap(log_tbl, sizeof(*log_tbl));
return ret;
--
2.23.0
On Wed Sep 18 19, Jerry Snitselaar wrote:
>If __calc_tpm2_event_size fails to parse an event it will return 0,
>resulting tpm2_calc_event_log_size returning -1. Currently
>there is no check of this return value, and efi_tpm_final_log_size
>can end up being set to this negative value resulting
>in a panic like the following:
>
>[ 0.774340] BUG: unable to handle page fault for address: ffffbc8fc00866ad
>[ 0.774788] #PF: supervisor read access in kernel mode
>[ 0.774788] #PF: error_code(0x0000) - not-present page
>[ 0.774788] PGD 107d36067 P4D 107d36067 PUD 107d37067 PMD 107d38067 PTE 0
>[ 0.774788] Oops: 0000 [#1] SMP PTI
>[ 0.774788] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.3.0-0.rc2.1.elrdy.x86_64 #1
>[ 0.774788] Hardware name: LENOVO 20HGS22D0W/20HGS22D0W, BIOS N1WET51W (1.30 ) 09/14/2018
>[ 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
>[ 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
>[ 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
>[ 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
>[ 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
>[ 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
>[ 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
>[ 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
>[ 0.774788] FS: 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
>[ 0.774788] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>[ 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
>[ 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>[ 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>[ 0.774788] Call Trace:
>[ 0.774788] tpm_read_log_efi+0x156/0x1a0
>[ 0.774788] tpm_bios_log_setup+0xc8/0x190
>[ 0.774788] tpm_chip_register+0x50/0x1c0
>[ 0.774788] tpm_tis_core_init.cold.9+0x28c/0x466
>[ 0.774788] tpm_tis_plat_probe+0xcc/0xea
>[ 0.774788] platform_drv_probe+0x35/0x80
>[ 0.774788] really_probe+0xef/0x390
>[ 0.774788] driver_probe_device+0xb4/0x100
>[ 0.774788] device_driver_attach+0x4f/0x60
>[ 0.774788] __driver_attach+0x86/0x140
>[ 0.774788] ? device_driver_attach+0x60/0x60
>[ 0.774788] bus_for_each_dev+0x76/0xc0
>[ 0.774788] ? klist_add_tail+0x3b/0x70
>[ 0.774788] bus_add_driver+0x14a/0x1e0
>[ 0.774788] ? tpm_init+0xea/0xea
>[ 0.774788] ? do_early_param+0x8e/0x8e
>[ 0.774788] driver_register+0x6b/0xb0
>[ 0.774788] ? tpm_init+0xea/0xea
>[ 0.774788] init_tis+0x86/0xd8
>[ 0.774788] ? do_early_param+0x8e/0x8e
>[ 0.774788] ? driver_register+0x94/0xb0
>[ 0.774788] do_one_initcall+0x46/0x1e4
>[ 0.774788] ? do_early_param+0x8e/0x8e
>[ 0.774788] kernel_init_freeable+0x199/0x242
>[ 0.774788] ? rest_init+0xaa/0xaa
>[ 0.774788] kernel_init+0xa/0x106
>[ 0.774788] ret_from_fork+0x35/0x40
>[ 0.774788] Modules linked in:
>[ 0.774788] CR2: ffffbc8fc00866ad
>[ 0.774788] ---[ end trace 42930799f8d6eaea ]---
>[ 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
>[ 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
>[ 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
>[ 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
>[ 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
>[ 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
>[ 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
>[ 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
>[ 0.774788] FS: 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
>[ 0.774788] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>[ 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
>[ 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>[ 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>[ 0.774788] Kernel panic - not syncing: Fatal exception
>[ 0.774788] Kernel Offset: 0x1d000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
>[ 0.774788] ---[ end Kernel panic - not syncing: Fatal exception ]---
>
>Fixes: c46f3405692de ("tpm: Reserve the TPM final events table")
>Cc: Matthew Garrett <[email protected]>
>Cc: Ard Biesheuvel <[email protected]>
>Cc: Jarkko Sakkinen <[email protected]>
>Signed-off-by: Jerry Snitselaar <[email protected]>
>---
> drivers/firmware/efi/tpm.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
>index 1d3f5ca3eaaf..5cd00a7833c2 100644
>--- a/drivers/firmware/efi/tpm.c
>+++ b/drivers/firmware/efi/tpm.c
>@@ -40,8 +40,7 @@ int __init efi_tpm_eventlog_init(void)
> {
> struct linux_efi_tpm_eventlog *log_tbl;
> struct efi_tcg2_final_events_table *final_tbl;
>- unsigned int tbl_size;
>- int ret = 0;
>+ int tbl_size, ret = 0;
>
> if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
> /*
>@@ -80,11 +79,17 @@ int __init efi_tpm_eventlog_init(void)
> + sizeof(final_tbl->nr_events),
> final_tbl->nr_events,
> log_tbl->log);
>+ if (tbl_size < 0) {
>+ pr_err("Failed to parse event in TPM Final Event log\n");
>+ goto calc_out;
>+ }
>+
> memblock_reserve((unsigned long)final_tbl,
> tbl_size + sizeof(*final_tbl));
>- early_memunmap(final_tbl, sizeof(*final_tbl));
> efi_tpm_final_log_size = tbl_size;
>
>+calc_out:
>+ early_memunmap(final_tbl, sizeof(*final_tbl));
> out:
> early_memunmap(log_tbl, sizeof(*log_tbl));
> return ret;
>--
>2.23.0
>
I'm not sure what to set ret to, which currently isn't checked, or if anything
should be done with efi.tpm_final_log.
Any thoughts on this? I know of at least 2 Lenovo models that are
running into this problem.
In the case of the one I have currently have access to the problem is
that the hash algorithm id for an event isn't one that is currently in
the TCG registry, and it fails to find a match when walking the
digest_sizes array. That seems like an issue for the vendor to fix in the bios,
but we should look at the return value of tpm2_calc_event_log_size and not
stick a negative value in efi_tpm_final_log_size.
On 9/18/19 8:23 PM, Jerry Snitselaar wrote:
> On Wed Sep 18 19, Jerry Snitselaar wrote:
>> If __calc_tpm2_event_size fails to parse an event it will return 0,
>> resulting tpm2_calc_event_log_size returning -1. Currently
>> there is no check of this return value, and efi_tpm_final_log_size
>> can end up being set to this negative value resulting
>> in a panic like the following:
>>
>> [??? 0.774340] BUG: unable to handle page fault for address: ffffbc8fc00866ad
>> [??? 0.774788] #PF: supervisor read access in kernel mode
>> [??? 0.774788] #PF: error_code(0x0000) - not-present page
>> [??? 0.774788] PGD 107d36067 P4D 107d36067 PUD 107d37067 PMD 107d38067 PTE 0
>> [??? 0.774788] Oops: 0000 [#1] SMP PTI
>> [??? 0.774788] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.3.0-0.rc2.1.elrdy.x86_64 #1
>> [??? 0.774788] Hardware name: LENOVO 20HGS22D0W/20HGS22D0W, BIOS N1WET51W (1.30 ) 09/14/2018
>> [??? 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
>> [??? 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
>> [??? 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
>> [??? 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
>> [??? 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
>> [??? 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
>> [??? 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
>> [??? 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
>> [??? 0.774788] FS:? 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
>> [??? 0.774788] CS:? 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [??? 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
>> [??? 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [??? 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> [??? 0.774788] Call Trace:
>> [??? 0.774788]? tpm_read_log_efi+0x156/0x1a0
>> [??? 0.774788]? tpm_bios_log_setup+0xc8/0x190
>> [??? 0.774788]? tpm_chip_register+0x50/0x1c0
>> [??? 0.774788]? tpm_tis_core_init.cold.9+0x28c/0x466
>> [??? 0.774788]? tpm_tis_plat_probe+0xcc/0xea
>> [??? 0.774788]? platform_drv_probe+0x35/0x80
>> [??? 0.774788]? really_probe+0xef/0x390
>> [??? 0.774788]? driver_probe_device+0xb4/0x100
>> [??? 0.774788]? device_driver_attach+0x4f/0x60
>> [??? 0.774788]? __driver_attach+0x86/0x140
>> [??? 0.774788]? ? device_driver_attach+0x60/0x60
>> [??? 0.774788]? bus_for_each_dev+0x76/0xc0
>> [??? 0.774788]? ? klist_add_tail+0x3b/0x70
>> [??? 0.774788]? bus_add_driver+0x14a/0x1e0
>> [??? 0.774788]? ? tpm_init+0xea/0xea
>> [??? 0.774788]? ? do_early_param+0x8e/0x8e
>> [??? 0.774788]? driver_register+0x6b/0xb0
>> [??? 0.774788]? ? tpm_init+0xea/0xea
>> [??? 0.774788]? init_tis+0x86/0xd8
>> [??? 0.774788]? ? do_early_param+0x8e/0x8e
>> [??? 0.774788]? ? driver_register+0x94/0xb0
>> [??? 0.774788]? do_one_initcall+0x46/0x1e4
>> [??? 0.774788]? ? do_early_param+0x8e/0x8e
>> [??? 0.774788]? kernel_init_freeable+0x199/0x242
>> [??? 0.774788]? ? rest_init+0xaa/0xaa
>> [??? 0.774788]? kernel_init+0xa/0x106
>> [??? 0.774788]? ret_from_fork+0x35/0x40
>> [??? 0.774788] Modules linked in:
>> [??? 0.774788] CR2: ffffbc8fc00866ad
>> [??? 0.774788] ---[ end trace 42930799f8d6eaea ]---
>> [??? 0.774788] RIP: 0010:memcpy_erms+0x6/0x10
>> [??? 0.774788] Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
>> [??? 0.774788] RSP: 0000:ffffbc8fc0073b30 EFLAGS: 00010286
>> [??? 0.774788] RAX: ffff9b1fc7c5b367 RBX: ffff9b1fc8390000 RCX: ffffffffffffe962
>> [??? 0.774788] RDX: ffffffffffffe962 RSI: ffffbc8fc00866ad RDI: ffff9b1fc7c5b367
>> [??? 0.774788] RBP: ffff9b1c10ca7018 R08: ffffbc8fc0085fff R09: 8000000000000063
>> [??? 0.774788] R10: 0000000000001000 R11: 000fffffffe00000 R12: 0000000000003367
>> [??? 0.774788] R13: ffff9b1fcc47c010 R14: ffffbc8fc0085000 R15: 0000000000000002
>> [??? 0.774788] FS:? 0000000000000000(0000) GS:ffff9b1fce200000(0000) knlGS:0000000000000000
>> [??? 0.774788] CS:? 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [??? 0.774788] CR2: ffffbc8fc00866ad CR3: 000000029f60a001 CR4: 00000000003606f0
>> [??? 0.774788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [??? 0.774788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> [??? 0.774788] Kernel panic - not syncing: Fatal exception
>> [??? 0.774788] Kernel Offset: 0x1d000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
>> [??? 0.774788] ---[ end Kernel panic - not syncing: Fatal exception ]---
>>
>> Fixes: c46f3405692de ("tpm: Reserve the TPM final events table")
>> Cc: Matthew Garrett <[email protected]>
>> Cc: Ard Biesheuvel <[email protected]>
>> Cc: Jarkko Sakkinen <[email protected]>
>> Signed-off-by: Jerry Snitselaar <[email protected]>
>> ---
>> drivers/firmware/efi/tpm.c | 11 ++++++++---
>> 1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
>> index 1d3f5ca3eaaf..5cd00a7833c2 100644
>> --- a/drivers/firmware/efi/tpm.c
>> +++ b/drivers/firmware/efi/tpm.c
>> @@ -40,8 +40,7 @@ int __init efi_tpm_eventlog_init(void)
>> {
>> ????struct linux_efi_tpm_eventlog *log_tbl;
>> ????struct efi_tcg2_final_events_table *final_tbl;
>> -??? unsigned int tbl_size;
>> -??? int ret = 0;
>> +??? int tbl_size, ret = 0;
>>
>> ????if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
>> ??????? /*
>> @@ -80,11 +79,17 @@ int __init efi_tpm_eventlog_init(void)
>> ??????????????????????? + sizeof(final_tbl->nr_events),
>> ??????????????????????? final_tbl->nr_events,
>> ??????????????????????? log_tbl->log);
>> +??? if (tbl_size < 0) {
>> +??????? pr_err("Failed to parse event in TPM Final Event log\n");
>> +??????? goto calc_out;
>> +??? }
>> +
>> ????memblock_reserve((unsigned long)final_tbl,
>> ???????????? tbl_size + sizeof(*final_tbl));
>> -??? early_memunmap(final_tbl, sizeof(*final_tbl));
>> ????efi_tpm_final_log_size = tbl_size;
>>
>> +calc_out:
>> +??? early_memunmap(final_tbl, sizeof(*final_tbl));
>> out:
>> ????early_memunmap(log_tbl, sizeof(*log_tbl));
>> ????return ret;
>> --
>> 2.23.0
>>
>
> I'm not sure what to set ret to, which currently isn't checked, or if anything
> should be done with efi.tpm_final_log.
>
fwiw, this is being hit by a number of Fedora users
https://bugzilla.redhat.com/show_bug.cgi?id=1752961
I'd like to bring this patch to Fedora if there's general agreement
this is the correct approach.
Thanks,
Laura
On Mon, Sep 23, 2019 at 10:10:10AM -0700, Jerry Snitselaar wrote:
> Any thoughts on this? I know of at least 2 Lenovo models that are
> running into this problem.
>
> In the case of the one I have currently have access to the problem is
> that the hash algorithm id for an event isn't one that is currently in
> the TCG registry, and it fails to find a match when walking the
> digest_sizes array. That seems like an issue for the vendor to fix in the bios,
> but we should look at the return value of tpm2_calc_event_log_size and not
> stick a negative value in efi_tpm_final_log_size.
Please use then "pr_err(FW_BUG".
Also, since you know the context you could add a comment along the
lines what you wrote.
/Jarkko
On Wed, Sep 18, 2019 at 12:16:26PM -0700, Jerry Snitselaar wrote:
> + if (tbl_size < 0) {
> + pr_err("Failed to parse event in TPM Final Event log\n");
FW_BUG?
> + goto calc_out;
> + }
> +
> memblock_reserve((unsigned long)final_tbl,
> tbl_size + sizeof(*final_tbl));
> - early_memunmap(final_tbl, sizeof(*final_tbl));
> efi_tpm_final_log_size = tbl_size;
>
> +calc_out:
> + early_memunmap(final_tbl, sizeof(*final_tbl));
out_calc
> out:
> early_memunmap(log_tbl, sizeof(*log_tbl));
> return ret;
> --
> 2.23.0
>
/Jarkko