On Wed, 9 Mar 2005, Jeff Garzik wrote:
> Greg KH wrote:
<snip>
> > +static ssize_t show_pubek(struct device *dev, char *buf)
> > +{
> > + u8 data[READ_PUBEK_RESULT_SIZE];
>
> massive obj on stack
<snip>
>
> > +static ssize_t show_caps(struct device *dev, char *buf)
> > +{
> > + u8 data[READ_PUBEK_RESULT_SIZE];
>
> massive obj on stack
<snip>
The patch below containes fixes for these large stack objects.
Signed-off-by: Kylene Hall <[email protected]>
---
--- linux-2.6.12-rc2/drivers/char/tpm/tpm.c 2005-04-21 18:11:12.000000000 -0500
+++ linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm.c 2005-04-21 18:13:10.000000000 -0500
@@ -253,7 +253,7 @@ static const u8 readpubek[] = {
ssize_t tpm_show_pubek(struct device *dev, char *buf)
{
- u8 data[READ_PUBEK_RESULT_SIZE];
+ u8 *data;
ssize_t len;
int i, rc;
char *str = buf;
@@ -263,12 +263,18 @@ ssize_t tpm_show_pubek(struct device *de
if (chip == NULL)
return -ENODEV;
+ data = kmalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
memcpy(data, readpubek, sizeof(readpubek));
memset(data + sizeof(readpubek), 0, 20); /* zero nonce */
- if ((len = tpm_transmit(chip, data, sizeof(data))) <
- READ_PUBEK_RESULT_SIZE)
- return len;
+ if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) <
+ READ_PUBEK_RESULT_SIZE) {
+ rc = len;
+ goto out;
+ }
/*
ignore header 10 bytes
@@ -298,7 +304,10 @@ ssize_t tpm_show_pubek(struct device *de
if ((i + 1) % 16 == 0)
str += sprintf(str, "\n");
}
- return str - buf;
+ rc = str - buf;
+out:
+ kfree(data);
+ return rc;
}
EXPORT_SYMBOL_GPL(tpm_show_pubek);
@@ -324,7 +333,7 @@ static const u8 cap_manufacturer[] = {
ssize_t tpm_show_caps(struct device *dev, char *buf)
{
- u8 data[READ_PUBEK_RESULT_SIZE];
+ u8 data[sizeof(cap_manufacturer)];
ssize_t len;
char *str = buf;
-
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