hwrng: pseries - port to new read API and fix stack corruption

The add_early_randomness() function in drivers/char/hw_random/core.c passes
a 16-byte buffer to pseries_rng_data_read(). Unfortunately, plpar_hcall()
returns four 64-bit values and trashes 16 bytes on the stack.

This bug has been lying around for a long time. It got unveiled by:

commit d3cc7996473a7bdd33256029988ea690754e4e2a
Author: Amit Shah <amit.shah@redhat.com>
Date:   Thu Jul 10 15:42:34 2014 +0530

    hwrng: fetch randomness only after device init

It may trig a oops while loading or unloading the pseries-rng module for both
PowerVM and PowerKVM guests.

This patch does two things:
- pass an intermediate well sized buffer to plpar_hcall(). This is acceptalbe
  since we're not on a hot path.
- move to the new read API so that we know the return buffer size for sure.

Cc: stable@vger.kernel.org
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c
index 6226aa08c36af59b9406b5a278880537e16ac9a4..bcf86f91800a2c1810791a4e3a508d490de0d8f9 100644 (file)
--- a/drivers/char/hw_random/pseries-rng.c
+++ b/drivers/char/hw_random/pseries-rng.c
@@ -25,18 +25,21 @@
 #include <asm/vio.h>
 
 
-static int pseries_rng_data_read(struct hwrng *rng, u32 *data)
+static int pseries_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
+       u64 buffer[PLPAR_HCALL_BUFSIZE];
+       size_t size = max < 8 ? max : 8;
        int rc;
 
-       rc = plpar_hcall(H_RANDOM, (unsigned long *)data);
+       rc = plpar_hcall(H_RANDOM, (unsigned long *)buffer);
        if (rc != H_SUCCESS) {
                pr_err_ratelimited("H_RANDOM call failed %d\n", rc);
                return -EIO;
        }
+       memcpy(data, buffer, size);
 
        /* The hypervisor interface returns 64 bits */
-       return 8;
+       return size;
 }
 
 /**
@@ -55,7 +58,7 @@ static unsigned long pseries_rng_get_desired_dma(struct vio_dev *vdev)
 
 static struct hwrng pseries_rng = {
        .name           = KBUILD_MODNAME,
-       .data_read      = pseries_rng_data_read,
+       .read           = pseries_rng_read,
 };
 
 static int __init pseries_rng_probe(struct vio_dev *dev,