106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <link.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "../kselftest.h"
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struct Statistics {
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unsigned long long load_address;
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unsigned long long alignment;
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bool interp;
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};
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int ExtractStatistics(struct dl_phdr_info *info, size_t size, void *data)
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{
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struct Statistics *stats = (struct Statistics *) data;
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int i;
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if (info->dlpi_name != NULL && info->dlpi_name[0] != '\0') {
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// Ignore headers from other than the executable.
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return 2;
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}
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stats->load_address = (unsigned long long) info->dlpi_addr;
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stats->alignment = 0;
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for (i = 0; i < info->dlpi_phnum; i++) {
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unsigned long long align;
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if (info->dlpi_phdr[i].p_type == PT_INTERP) {
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stats->interp = true;
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continue;
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}
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if (info->dlpi_phdr[i].p_type != PT_LOAD)
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continue;
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align = info->dlpi_phdr[i].p_align;
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if (align > stats->alignment)
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stats->alignment = align;
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}
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return 1; // Terminate dl_iterate_phdr.
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}
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int main(int argc, char **argv)
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{
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struct Statistics extracted = { };
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unsigned long long misalign, pow2;
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bool interp_needed;
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char buf[1024];
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FILE *maps;
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int ret;
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ksft_print_header();
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ksft_set_plan(4);
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/* Dump maps file for debugging reference. */
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maps = fopen("/proc/self/maps", "r");
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if (!maps)
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ksft_exit_fail_msg("FAILED: /proc/self/maps: %s\n", strerror(errno));
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while (fgets(buf, sizeof(buf), maps)) {
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ksft_print_msg("%s", buf);
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}
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fclose(maps);
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/* Walk the program headers. */
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ret = dl_iterate_phdr(ExtractStatistics, &extracted);
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if (ret != 1)
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ksft_exit_fail_msg("FAILED: dl_iterate_phdr\n");
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/* Report our findings. */
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ksft_print_msg("load_address=%#llx alignment=%#llx\n",
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extracted.load_address, extracted.alignment);
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/* If we're named with ".static." we expect no INTERP. */
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interp_needed = strstr(argv[0], ".static.") == NULL;
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/* Were we built as expected? */
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ksft_test_result(interp_needed == extracted.interp,
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"%s INTERP program header %s\n",
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interp_needed ? "Wanted" : "Unwanted",
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extracted.interp ? "seen" : "missing");
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/* Did we find an alignment? */
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ksft_test_result(extracted.alignment != 0,
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"Alignment%s found\n", extracted.alignment ? "" : " NOT");
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/* Is the alignment sane? */
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pow2 = extracted.alignment & (extracted.alignment - 1);
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ksft_test_result(pow2 == 0,
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"Alignment is%s a power of 2: %#llx\n",
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pow2 == 0 ? "" : " NOT", extracted.alignment);
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/* Is the load address aligned? */
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misalign = extracted.load_address & (extracted.alignment - 1);
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ksft_test_result(misalign == 0, "Load Address is %saligned (%#llx)\n",
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misalign ? "MIS" : "", misalign);
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ksft_finished();
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}
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