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| author |   Pascal van Leeuwen <pvanleeuwen@rambus.com> | 2020-09-08 08:10:45 +0200 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2020-09-18 17:20:10 +1000 |
| commit | bd03b0214ad426c078d46c2b54a3b14f81b97f6b (patch) | |
| tree | 2fba28b5a9e607da605b6c654aa567e71cca8c96 /drivers/crypto/inside-secure/safexcel_ring.c | |
| parent | crypto: sun4i-ss - Fix sparse endianness markers (diff) | |
| download | linux-dev-bd03b0214ad426c078d46c2b54a3b14f81b97f6b.tar.xz linux-dev-bd03b0214ad426c078d46c2b54a3b14f81b97f6b.zip | |
crypto: inside-secure - Prevent missing of processing errors
On systems with coherence issues, packet processed could succeed while
it should have failed, e.g. because of an authentication fail.
This is because the driver would read stale status information that had
all error bits initialised to zero = no error.
Since this is potential a security risk, we want to prevent it from being
a possibility at all. So initialize all error bits to error state, so
that reading stale status information will always result in errors.
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@rambus.com>
Acked-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/inside-secure/safexcel_ring.c')
| -rw-r--r-- | drivers/crypto/inside-secure/safexcel_ring.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/crypto/inside-secure/safexcel_ring.c b/drivers/crypto/inside-secure/safexcel_ring.c index e454c3d44f07..90f15032c8df 100644 --- a/drivers/crypto/inside-secure/safexcel_ring.c +++ b/drivers/crypto/inside-secure/safexcel_ring.c @@ -236,8 +236,8 @@ struct safexcel_result_desc *safexcel_add_rdesc(struct safexcel_crypto_priv *pri rdesc->particle_size = len; rdesc->rsvd0 = 0; - rdesc->descriptor_overflow = 0; - rdesc->buffer_overflow = 0; + rdesc->descriptor_overflow = 1; /* assume error */ + rdesc->buffer_overflow = 1; /* assume error */ rdesc->last_seg = last; rdesc->first_seg = first; rdesc->result_size = EIP197_RD64_RESULT_SIZE; @@ -245,9 +245,10 @@ struct safexcel_result_desc *safexcel_add_rdesc(struct safexcel_crypto_priv *pri rdesc->data_lo = lower_32_bits(data); rdesc->data_hi = upper_32_bits(data); - /* Clear length & error code in result token */ + /* Clear length in result token */ rtoken->packet_length = 0; - rtoken->error_code = 0; + /* Assume errors - HW will clear if not the case */ + rtoken->error_code = 0x7fff; return rdesc; } |