[PATCH v2 14/15] crypto: testmgr - check for skcipher_request corruption

[Eric Biggers]

From: Eric Biggers <ebigg...@google.com>

Check that algorithms do not change the skcipher_request structure, as
users may rely on submitting the request again (e.g. after copying new
data into the same source buffer) without reinitializing everything.

Signed-off-by: Eric Biggers <ebigg...@google.com>
---
 crypto/testmgr.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 96aa268ff4184..c4ee453e8bf53 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -1535,6 +1535,47 @@ static int test_skcipher_vec_cfg(const char *driver, int 
enc,
                return err;
        }
 
+       /* Check that the algorithm didn't overwrite things it shouldn't have */
+       if (req->cryptlen != vec->len ||
+           req->iv != iv ||
+           req->src != tsgls->src.sgl_ptr ||
+           req->dst != tsgls->dst.sgl_ptr ||
+           crypto_skcipher_reqtfm(req) != tfm ||
+           req->base.complete != crypto_req_done ||
+           req->base.flags != req_flags ||
+           req->base.data != &wait) {
+               pr_err("alg: skcipher: %s %s corrupted request struct on test 
vector %u, cfg=\"%s\"\n",
+                      driver, op, vec_num, cfg->name);
+               if (req->cryptlen != vec->len)
+                       pr_err("alg: skcipher: changed 'req->cryptlen'\n");
+               if (req->iv != iv)
+                       pr_err("alg: skcipher: changed 'req->iv'\n");
+               if (req->src != tsgls->src.sgl_ptr)
+                       pr_err("alg: skcipher: changed 'req->src'\n");
+               if (req->dst != tsgls->dst.sgl_ptr)
+                       pr_err("alg: skcipher: changed 'req->dst'\n");
+               if (crypto_skcipher_reqtfm(req) != tfm)
+                       pr_err("alg: skcipher: changed 'req->base.tfm'\n");
+               if (req->base.complete != crypto_req_done)
+                       pr_err("alg: skcipher: changed 'req->base.complete'\n");
+               if (req->base.flags != req_flags)
+                       pr_err("alg: skcipher: changed 'req->base.flags'\n");
+               if (req->base.data != &wait)
+                       pr_err("alg: skcipher: changed 'req->base.data'\n");
+               return -EINVAL;
+       }
+       if (is_test_sglist_corrupted(&tsgls->src)) {
+               pr_err("alg: skcipher: %s %s corrupted src sgl on test vector 
%u, cfg=\"%s\"\n",
+                      driver, op, vec_num, cfg->name);
+               return -EINVAL;
+       }
+       if (tsgls->dst.sgl_ptr != tsgls->src.sgl &&
+           is_test_sglist_corrupted(&tsgls->dst)) {
+               pr_err("alg: skcipher: %s %s corrupted dst sgl on test vector 
%u, cfg=\"%s\"\n",
+                      driver, op, vec_num, cfg->name);
+               return -EINVAL;
+       }
+
        /* Check for the correct output (ciphertext or plaintext) */
        err = verify_correct_output(&tsgls->dst, enc ? vec->ctext : vec->ptext,
                                    vec->len, 0, true);
-- 
2.20.1