diff options
| author | Horia Geantă <horia.geanta@nxp.com> | 2020-03-23 11:37:11 +0200 |
|---|---|---|
| committer | Horia Geantă <horia.geanta@nxp.com> | 2020-03-31 13:39:32 +0300 |
| commit | 02e96760b8fbeffcab1769f9a9a45da661409cc2 (patch) | |
| tree | 8d4beb3816bb6254b830293f09d9d190c5e28b4f /crypto | |
| parent | 651364b5fe44c83cb8f89c4d9f8f89359fb787c5 (diff) | |
MLK-21644 crypto: tcrypt - workaround for overlapping src, dst AAD
This is a temporary workround for the case when:
-SWIOTLB is used for DMA bounce buffering AND
-data to be DMA-ed is mapped DMA_FROM_DEVICE and device only partially
overwrites the "original" data AND
-it's expected that the "original" data that was not overwritten
by the device to be untouched
As discussed in upstream, the proper fix should be:
-either an extension of the DMA API OR
-a workaround in the device driver (considering these cases are rarely
met in practice)
Since both alternatives are not trivial (to say the least),
add a workaround for the few cases matching the error conditions
listed above.
Link: https://lore.kernel.org/lkml/VI1PR0402MB348537CB86926B3E6D1DBE0A98070@VI1PR0402MB3485.eurprd04.prod.outlook.com/
Link: https://lore.kernel.org/lkml/20190522072018.10660-1-horia.geanta@nxp.com/
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Reviewed-by: Valentin Ciocoi Radulescu <valentin.ciocoi@nxp.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/tcrypt.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c index 54952bd885c4..8bbc5de37ca4 100644 --- a/crypto/tcrypt.c +++ b/crypto/tcrypt.c @@ -224,7 +224,7 @@ static void test_aead_speed(const char *algo, int enc, unsigned int secs, struct scatterlist *sg; struct scatterlist *sgout; const char *e; - void *assoc; + void *assoc, *assoc_out; char *iv; char *xbuf[XBUFSIZE]; char *xoutbuf[XBUFSIZE]; @@ -287,6 +287,8 @@ static void test_aead_speed(const char *algo, int enc, unsigned int secs, do { assoc = axbuf[0]; memset(assoc, 0xff, aad_size); + assoc_out = axbuf[1]; + memset(assoc_out, 0xff, aad_size); if ((*keysize + *b_size) > TVMEMSIZE * PAGE_SIZE) { pr_err("template (%u) too big for tvmem (%lu)\n", @@ -326,7 +328,7 @@ static void test_aead_speed(const char *algo, int enc, unsigned int secs, assoc, aad_size); sg_init_aead(sgout, xoutbuf, - *b_size + (enc ? authsize : 0), assoc, + *b_size + (enc ? authsize : 0), assoc_out, aad_size); aead_request_set_ad(req, aad_size); @@ -348,6 +350,9 @@ static void test_aead_speed(const char *algo, int enc, unsigned int secs, ret); break; } + + memset(assoc, 0xff, aad_size); + memset(assoc_out, 0xff, aad_size); } aead_request_set_crypt(req, sg, sgout, |