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Fix reading of child output when it's fragmented

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In the success case, we were only reporting the correct data written by the
child if the data was read in a single `read` call.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2026-03-16 15:26:24 +01:00
parent 96c9dca216
commit f7df78d3ab
1 changed files with 11 additions and 11 deletions
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tests/src/fork_helpers.c
+11 -11
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@@ -128,29 +128,29 @@ int mbedtls_test_fork_run_child(
/* Tentatively read what we were promised. Don't commit to anything
* until we have the child's exit status. */
size_t offset = 0;
size_t bytes_read = 0;
if (result_char == MBEDTLS_TEST_RESULT_SUCCESS) {
do {
n = read(pipe_fd[0],
child_output + offset,
child_output_size - offset);
child_output + bytes_read,
child_output_size - bytes_read);
if (n > 0) {
offset += n;
bytes_read += n;
}
} while (n > 0 && offset < child_output_size);
} while (n > 0 && bytes_read < child_output_size);
TEST_ASSERT_ERRNO(n != -1);
} else {
do {
n = read(pipe_fd[0],
(unsigned char *) &reading_on_failure + offset,
sizeof(reading_on_failure) - offset);
(unsigned char *) &reading_on_failure + bytes_read,
sizeof(reading_on_failure) - bytes_read);
if (n > 0) {
offset += n;
bytes_read += n;
}
} while (n > 0 && offset < sizeof(reading_on_failure));
} while (n > 0 && bytes_read < sizeof(reading_on_failure));
TEST_ASSERT_ERRNO(n != -1);
/* Check that the child wrote the amount of data that what we expect. */
TEST_EQUAL(offset, sizeof(reading_on_failure.child_test_info));
TEST_EQUAL(bytes_read, sizeof(reading_on_failure.child_test_info));
}
/* Close the pipe. If we left it open, there could be a deadlock if the
@@ -163,7 +163,7 @@ int mbedtls_test_fork_run_child(
TEST_ASSERT_ERRNO(waitpid(pid, &wstatus, 0) == pid);
if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == CHILD_EXIT_CODE_OK) {
if (result_char == MBEDTLS_TEST_RESULT_SUCCESS) {
*child_output_length = n;
*child_output_length = bytes_read;
ret = 0;
} else {
mbedtls_test_info_overwrite(&reading_on_failure.child_test_info);