crypto: testmgr - Use heap buffer for acomp test input

Christopher Covington reported a crash on aarch64 on recent Fedora
kernels:

kernel BUG at ./include/linux/scatterlist.h:140!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162
Hardware name: linux,dummy-virt (DT)
task: ffff80007c650080 task.stack: ffff800008910000
PC is at sg_init_one+0xa0/0xb8
LR is at sg_init_one+0x24/0xb8
...
[<ffff000008398db8>] sg_init_one+0xa0/0xb8
[<ffff000008350a44>] test_acomp+0x10c/0x438
[<ffff000008350e20>] alg_test_comp+0xb0/0x118
[<ffff00000834f28c>] alg_test+0x17c/0x2f0
[<ffff00000834c6a4>] cryptomgr_test+0x44/0x50
[<ffff0000080dac70>] kthread+0xf8/0x128
[<ffff000008082ec0>] ret_from_fork+0x10/0x50

The test vectors used for input are part of the kernel image. These
inputs are passed as a buffer to sg_init_one which eventually blows up
with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns
false for the kernel image since virt_to_page will not return the
correct page. Fix this by copying the input vectors to heap buffer
before setting up the scatterlist.

Reported-by: Christopher Covington <cov@codeaurora.org>
Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp")
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index f616ad74cce756fb2d0a0657d153483ed05f56d7..44e888b0b041944b44e8aa5d75619e51d7fe52a2 100644 (file)
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -1461,16 +1461,25 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
        for (i = 0; i < ctcount; i++) {
                unsigned int dlen = COMP_BUF_SIZE;
                int ilen = ctemplate[i].inlen;
+               void *input_vec;
 
+               input_vec = kmalloc(ilen, GFP_KERNEL);
+               if (!input_vec) {
+                       ret = -ENOMEM;
+                       goto out;
+               }
+
+               memcpy(input_vec, ctemplate[i].input, ilen);
                memset(output, 0, dlen);
                init_completion(&result.completion);
-               sg_init_one(&src, ctemplate[i].input, ilen);
+               sg_init_one(&src, input_vec, ilen);
                sg_init_one(&dst, output, dlen);
 
                req = acomp_request_alloc(tfm);
                if (!req) {
                        pr_err("alg: acomp: request alloc failed for %s\n",
                               algo);
+                       kfree(input_vec);
                        ret = -ENOMEM;
                        goto out;
                }
@@ -1483,6 +1492,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                if (ret) {
                        pr_err("alg: acomp: compression failed on test %d for %s: ret=%d\n",
                               i + 1, algo, -ret);
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
@@ -1491,6 +1501,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                        pr_err("alg: acomp: Compression test %d failed for %s: output len = %d\n",
                               i + 1, algo, req->dlen);
                        ret = -EINVAL;
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
@@ -1500,26 +1511,37 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                               i + 1, algo);
                        hexdump(output, req->dlen);
                        ret = -EINVAL;
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
 
+               kfree(input_vec);
                acomp_request_free(req);
        }
 
        for (i = 0; i < dtcount; i++) {
                unsigned int dlen = COMP_BUF_SIZE;
                int ilen = dtemplate[i].inlen;
+               void *input_vec;
+
+               input_vec = kmalloc(ilen, GFP_KERNEL);
+               if (!input_vec) {
+                       ret = -ENOMEM;
+                       goto out;
+               }
 
+               memcpy(input_vec, dtemplate[i].input, ilen);
                memset(output, 0, dlen);
                init_completion(&result.completion);
-               sg_init_one(&src, dtemplate[i].input, ilen);
+               sg_init_one(&src, input_vec, ilen);
                sg_init_one(&dst, output, dlen);
 
                req = acomp_request_alloc(tfm);
                if (!req) {
                        pr_err("alg: acomp: request alloc failed for %s\n",
                               algo);
+                       kfree(input_vec);
                        ret = -ENOMEM;
                        goto out;
                }
@@ -1532,6 +1554,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                if (ret) {
                        pr_err("alg: acomp: decompression failed on test %d for %s: ret=%d\n",
                               i + 1, algo, -ret);
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
@@ -1540,6 +1563,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                        pr_err("alg: acomp: Decompression test %d failed for %s: output len = %d\n",
                               i + 1, algo, req->dlen);
                        ret = -EINVAL;
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
@@ -1549,10 +1573,12 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
                               i + 1, algo);
                        hexdump(output, req->dlen);
                        ret = -EINVAL;
+                       kfree(input_vec);
                        acomp_request_free(req);
                        goto out;
                }
 
+               kfree(input_vec);
                acomp_request_free(req);
        }