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56 lines
1.7 KiB
56 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2019 Google LLC
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*/
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/*
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* Regression test for commit 8088d3dd4d7c ("crypto: skcipher - fix crash
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* flushing dcache in error path"). This test verifies the kernel doesn't crash
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* when trying to encrypt a message with size not aligned to the block cipher's
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* block size, and where the destination buffer starts exactly at a page
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* boundary. Based on the reproducer from the commit message. Note that this
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* issue only reproduces on certain architectures, such as arm and arm64.
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*
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* On some older kernel without commit 160544075f2a ("crypto: scatterwalk - Hide
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* PageSlab call to optimise away flush_dcache_page") , it doesn't use
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* ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE macro. It can crash on all architectures.
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* Without skcipher walk interface, it is also a regresstion test for commit
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* 0868def3e410("crypto: blkcipher - fix crash flushing dcache in error path").
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*/
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#include <errno.h>
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#include "tst_test.h"
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#include "tst_af_alg.h"
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static void run(void)
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{
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char buffer[4096] __attribute__((aligned(4096))) = { 0 };
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int reqfd;
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reqfd = tst_alg_setup_reqfd("skcipher", "cbc(aes-generic)", NULL, 16);
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SAFE_WRITE(1, reqfd, buffer, 15);
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/* with the bug, this crashed the kernel on some architectures */
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TEST(read(reqfd, buffer, 15));
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if (TST_RET == 0)
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tst_res(TBROK, "read() unexpectedly succeeded");
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else if (TST_ERR == EINVAL)
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tst_res(TPASS, "read() expectedly failed with EINVAL");
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else
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tst_res(TBROK | TTERRNO, "read() failed with unexpected error");
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close(reqfd);
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}
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static struct tst_test test = {
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.test_all = run,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "8088d3dd4d7c"},
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{"linux-git", "160544075f2a"},
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{"linux-git", "0868def3e410"},
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{}
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}
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};
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