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diff --git a/tests/sys/geom/class/eli/Makefile b/tests/sys/geom/class/eli/Makefile
--- a/tests/sys/geom/class/eli/Makefile
+++ b/tests/sys/geom/class/eli/Makefile
@@ -37,6 +37,9 @@
LIBADD.pbkdf2_test= crypto
+PROGS+= unaligned_io
+BINDIR?= ${TESTSDIR}
+
testvect.h:
python gentestvect.py > ${.TARGET}
diff --git a/tests/sys/geom/class/eli/misc_test.sh b/tests/sys/geom/class/eli/misc_test.sh
--- a/tests/sys/geom/class/eli/misc_test.sh
+++ b/tests/sys/geom/class/eli/misc_test.sh
@@ -135,17 +135,51 @@
true
}
+unaligned_io_test()
+{
+ cipher=$1
+ secsize=$2
+ ealgo=${cipher%%:*}
+ keylen=${cipher##*:}
+
+ atf_check -s exit:0 -e ignore \
+ geli init -B none -e $ealgo -l $keylen -P -K keyfile \
+ -s $secsize ${md}
+ atf_check geli attach -p -k keyfile ${md}
+
+ atf_check $(atf_get_srcdir)/unaligned_io /dev/${md}.eli
+}
+
+atf_test_case unaligned_io cleanup
+unaligned_io_head()
+{
+ atf_set "descr" "regression test for PR 271766"
+ atf_set "require.user" "root"
+}
+unaligned_io_body()
+{
+ geli_test_setup
+
+ sectors=4
+
+ atf_check dd if=/dev/random of=keyfile bs=512 count=16 status=none
+ for_each_geli_config_nointegrity unaligned_io_test
+}
+unaligned_io_cleanup()
+{
+ geli_test_cleanup
+}
+
atf_init_test_cases()
{
atf_add_test_case physpath
atf_add_test_case preserve_props
atf_add_test_case preserve_disk_props
+ atf_add_test_case unaligned_io
}
-
common_cleanup()
{
-
if [ -f "$MD_DEVS" ]; then
while read test_md; do
gnop destroy -f ${test_md}.nop 2>/dev/null
diff --git a/tests/sys/geom/class/eli/unaligned_io.c b/tests/sys/geom/class/eli/unaligned_io.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/geom/class/eli/unaligned_io.c
@@ -0,0 +1,98 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 The FreeBSD Foundation
+ */
+
+/*
+ * Idea from a test case by Andrew "RhodiumToad" Gierth in Bugzilla PR 271766.
+ */
+
+#include <sys/disk.h>
+#include <sys/mman.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv)
+{
+ const char *disk;
+ char *buf1, *buf2;
+ off_t disksz;
+ size_t bufsz, iosz;
+ ssize_t n;
+ unsigned int secsz;
+ int fd;
+
+ if (argc != 2)
+ errx(1, "Usage: %s <disk>", argv[0]);
+ disk = argv[1];
+
+ fd = open(disk, O_RDWR);
+ if (fd < 0)
+ err(1, "open(%s)", disk);
+
+ if (ioctl(fd, DIOCGSECTORSIZE, &secsz) != 0)
+ err(1, "ioctl(DIOCGSECTORSIZE)");
+ if (secsz == 0)
+ errx(1, "ioctl(DIOCGSECTORSIZE) returned 0");
+ if (ioctl(fd, DIOCGMEDIASIZE, &disksz) != 0)
+ err(1, "ioctl(DIOCGMEDIASIZE)");
+ if (disksz / secsz < 2)
+ errx(1, "disk needs to be at least 2 sectors in size");
+ iosz = 2 * secsz;
+
+ bufsz = iosz + secsz;
+ buf1 = mmap(NULL, bufsz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
+ -1, 0);
+ if (buf1 == MAP_FAILED)
+ err(1, "mmap");
+ buf2 = mmap(NULL, bufsz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
+ -1, 0);
+ if (buf2 == MAP_FAILED)
+ err(1, "mmap");
+
+ arc4random_buf(buf1, bufsz);
+ n = pwrite(fd, buf1, bufsz, 0);
+ if (n < 0 || (size_t)n != bufsz)
+ err(1, "pwrite");
+
+ /*
+ * Read test: read the first 2 sectors into buf1, then do the same with
+ * buf2, except at varying offsets into buf2. After each read, compare
+ * the buffers and make sure they're identical. This exercises corner
+ * cases in the crypto layer's buffer handling.
+ */
+ n = pread(fd, buf1, iosz, 0);
+ if (n < 0 || (size_t)n != iosz)
+ err(1, "pread");
+ for (unsigned int i = 0; i < secsz; i++) {
+ n = pread(fd, buf2 + i, iosz, 0);
+ if (n < 0 || (size_t)n != iosz)
+ err(1, "pread");
+ if (memcmp(buf1, buf2 + i, iosz) != 0)
+ errx(1, "read mismatch at offset %u/%u", i, secsz);
+ }
+
+ /*
+ * Write test. Try writing buffers at various alignments, and verify
+ * that we read back what we wrote.
+ */
+ arc4random_buf(buf1, bufsz);
+ for (unsigned int i = 0; i < secsz; i++) {
+ n = pwrite(fd, buf1 + i, iosz, 0);
+ if (n < 0 || (size_t)n != iosz)
+ err(1, "pwrite");
+ n = pread(fd, buf2, iosz, 0);
+ if (n < 0 || (size_t)n != iosz)
+ err(1, "pread");
+ if (memcmp(buf1 + i, buf2, iosz) != 0)
+ errx(1, "write mismatch at offset %u/%u", i, secsz);
+ }
+
+ return (0);
+}

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