On 1/15/25 4:22 PM, Jarkko Sakkinen wrote:
The following failure was reported:
[ 10.693310][ T1] tpm_tis STM0925:00: 2.0 TPM (device-id 0x3, rev-id 0) [ 10.848132][ T1] ------------[ cut here ]------------ [ 10.853559][ T1] WARNING: CPU: 59 PID: 1 at mm/page_alloc.c:4727 __alloc_pages_noprof+0x2ca/0x330 [ 10.862827][ T1] Modules linked in: [ 10.866671][ T1] CPU: 59 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-lp155.2.g52785e2-default #1 openSUSE Tumbleweed (unreleased) 588cd98293a7c9eba9013378d807364c088c9375 [ 10.882741][ T1] Hardware name: HPE ProLiant DL320 Gen12/ProLiant DL320 Gen12, BIOS 1.20 10/28/2024 [ 10.892170][ T1] RIP: 0010:__alloc_pages_noprof+0x2ca/0x330 [ 10.898103][ T1] Code: 24 08 e9 4a fe ff ff e8 34 36 fa ff e9 88 fe ff ff 83 fe 0a 0f 86 b3 fd ff ff 80 3d 01 e7 ce 01 00 75 09 c6 05 f8 e6 ce 01 01 <0f> 0b 45 31 ff e9 e5 fe ff ff f7 c2 00 00 08 00 75 42 89 d9 80 e1 [ 10.917750][ T1] RSP: 0000:ffffb7cf40077980 EFLAGS: 00010246 [ 10.923777][ T1] RAX: 0000000000000000 RBX: 0000000000040cc0 RCX: 0000000000000000 [ 10.931727][ T1] RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000040cc0
Above shows that ACPI pointed a 16 MiB buffer for the log events because RSI maps to the 'order' parameter of __alloc_pages_noprof(). Address the bug with kvmalloc() and devm_add_action_or_reset().
Before at it was (at least) failing when the BIOS requested an excessive size. Now since you don't want to limit the size of the log I suppose you wouldn't also want to set a size of what is excessive so that the driver could dev_warn() the user of an excessive-sized buffer ...
Suggested-by: Ard Biesheuvel ardb@kernel.org Cc: stable@vger.kernel.org # v2.6.16+ Fixes: 55a82ab3181b ("[PATCH] tpm: add bios measurement log") Reported-by: Andy Liang andy.liang@hpe.com Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219495 Signed-off-by: Jarkko Sakkinen jarkko@kernel.org
Reviewed-by: Stefan Berger stefanb@linux.ibm.com
v9:
- Call devm_add_action() as the last step and execute the plain action in the fallback path: https://lore.kernel.org/linux-integrity/87frlzzx14.wl-tiwai@suse.de/
v8:
- Reduced to only to this quick fix. Let HPE reserve 16 MiB if they want to. We have mapping approach backed up in lore.
v7:
- Use devm_add_action_or_reset().
- Fix tags.
v6:
- A new patch.
drivers/char/tpm/eventlog/acpi.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c index 69533d0bfb51..cf02ec646f46 100644 --- a/drivers/char/tpm/eventlog/acpi.c +++ b/drivers/char/tpm/eventlog/acpi.c @@ -63,6 +63,11 @@ static bool tpm_is_tpm2_log(void *bios_event_log, u64 len) return n == 0; } +static void tpm_bios_log_free(void *data) +{
- kvfree(data);
+}
- /* read binary bios log */ int tpm_read_log_acpi(struct tpm_chip *chip) {
@@ -136,7 +141,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip) } /* malloc EventLog space */
- log->bios_event_log = devm_kmalloc(&chip->dev, len, GFP_KERNEL);
- log->bios_event_log = kvmalloc(len, GFP_KERNEL); if (!log->bios_event_log)> return -ENOMEM;
@@ -161,10 +166,16 @@ int tpm_read_log_acpi(struct tpm_chip *chip) goto err; }
- ret = devm_add_action(&chip->dev, tpm_bios_log_free, log->bios_event_log);
- if (ret) {
log->bios_event_log = NULL;goto err;- }
- return format;
err:
- devm_kfree(&chip->dev, log->bios_event_log);
- tpm_bios_log_free(log->bios_event_log); log->bios_event_log = NULL; return ret; }