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TPM: Zero buffer after copying to userspace

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Since the buffer might contain security related data it might be a good idea to
zero the buffer after we have copied it to userspace.

This got assigned CVE-2011-1162.

Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Cc: Stable Kernel <stable@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Peter Huewe 2011-09-15 14:47:42 -03:00 committed by James Morris
parent 6b07d30aca
commit 3321c07ae5
1 changed files with 5 additions and 1 deletions
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6
drivers/char/tpm/tpm.c
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@ -1105,6 +1105,7 @@ ssize_t tpm_read(struct file *file, char __user *buf,
{
struct tpm_chip *chip = file->private_data;
ssize_t ret_size;
int rc;
del_singleshot_timer_sync(&chip->user_read_timer);
flush_work_sync(&chip->work);
@ -1115,8 +1116,11 @@ ssize_t tpm_read(struct file *file, char __user *buf,
ret_size = size;
mutex_lock(&chip->buffer_mutex);
if (copy_to_user(buf, chip->data_buffer, ret_size))
rc = copy_to_user(buf, chip->data_buffer, ret_size);
memset(chip->data_buffer, 0, ret_size);
if (rc)
ret_size = -EFAULT;
mutex_unlock(&chip->buffer_mutex);
}