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kselftest/arm64: mte: user_mem: check different offsets and sizes

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To check there are no assumptions in the kernel about buffer sizes or alignments of
user space pointers, expand the test to cover different sizes and offsets.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Tested-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220209152240.52788-4-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joey Gouly 2022-02-09 15:22:37 +00:00 committed by Will Deacon
parent ff0b9aba30
commit 682b064bae
1 changed files with 27 additions and 18 deletions
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45
tools/testing/selftests/arm64/mte/check_user_mem.c
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@ -26,6 +26,8 @@ static int check_usermem_access_fault(int mem_type, int mode, int mapping,
char val = 'A';
size_t len, read_len;
void *ptr, *ptr_next;
int fileoff, ptroff, size;
int sizes[] = {1, 2, 3, 8, 16, 32, 4096, page_sz};
err = KSFT_PASS;
len = 2 * page_sz;
@ -62,24 +64,31 @@ static int check_usermem_access_fault(int mem_type, int mode, int mapping,
ptr_next = mte_insert_new_tag(ptr_next);
mte_set_tag_address_range(ptr_next, tag_len);
lseek(fd, 0, 0);
/* Copy from file into buffer with invalid tag */
read_len = read(fd, ptr, len);
mte_wait_after_trig();
/*
* Accessing user memory in kernel with invalid tag should fail in sync
* mode without fault but may not fail in async mode as per the
* implemented MTE userspace support in Arm64 kernel.
*/
if (cur_mte_cxt.fault_valid)
goto usermem_acc_err;
if (mode == MTE_SYNC_ERR && read_len < len) {
/* test passed */
} else if (mode == MTE_ASYNC_ERR && read_len == len) {
/* test passed */
} else {
goto usermem_acc_err;
for (fileoff = 0; fileoff < 16; fileoff++) {
for (ptroff = 0; ptroff < 16; ptroff++) {
for (i = 0; i < ARRAY_SIZE(sizes); i++) {
size = sizes[i];
lseek(fd, 0, 0);
/* Copy from file into buffer with invalid tag */
read_len = read(fd, ptr + ptroff, size);
mte_wait_after_trig();
/*
* Accessing user memory in kernel with invalid tag should fail in sync
* mode without fault but may not fail in async mode as per the
* implemented MTE userspace support in Arm64 kernel.
*/
if (cur_mte_cxt.fault_valid) {
goto usermem_acc_err;
}
if (mode == MTE_SYNC_ERR && read_len < len) {
/* test passed */
} else if (mode == MTE_ASYNC_ERR && read_len == size) {
/* test passed */
} else {
goto usermem_acc_err;
}
}
}
}
goto exit;