* [PATCH 2/2] tpm2_bios_measurements_next should increase position index
@ 2020-01-23 7:48 Vasily Averin
0 siblings, 0 replies; only message in thread
From: Vasily Averin @ 2020-01-23 7:48 UTC (permalink / raw)
To: linux-integrity; +Cc: Peter Huewe, Jarkko Sakkinen, Jason Gunthorpe
If seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.
https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
drivers/char/tpm/eventlog/tpm2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/eventlog/tpm2.c b/drivers/char/tpm/eventlog/tpm2.c
index b9aeda1..e741b11 100644
--- a/drivers/char/tpm/eventlog/tpm2.c
+++ b/drivers/char/tpm/eventlog/tpm2.c
@@ -94,6 +94,7 @@ static void *tpm2_bios_measurements_next(struct seq_file *m, void *v,
size_t event_size;
void *marker;
+ (*pos)++;
event_header = log->bios_event_log;
if (v == SEQ_START_TOKEN) {
@@ -118,7 +119,6 @@ static void *tpm2_bios_measurements_next(struct seq_file *m, void *v,
if (((v + event_size) >= limit) || (event_size == 0))
return NULL;
- (*pos)++;
return v;
}
--
1.8.3.1
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