vasilito
b9874d0941
Add redbear-usb-storage-check in-guest binary that validates USB mass storage read and write I/O: discovers /scheme/disk/ devices, writes a test pattern to sector 2048, reads it back, verifies match, restores original content. Updates test-usb-storage-qemu.sh with write-proof verification step. Includes all accumulated Red Bear OS work: kernel patches, relibc patches, driver infrastructure, DRM/GPU, KDE recipes, firmware, validation tooling, build system hardening, and documentation.
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
#include <assert.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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int main(void) {
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int status = EXIT_FAILURE;
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char tempdir_path[] = "/tmp/lstat_test.XXXXXX";
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if (!mkdtemp(tempdir_path)) {
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perror("mkdtemp");
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goto bye;
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}
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int tempdir = open(tempdir_path, O_DIRECTORY);
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if (tempdir == -1) {
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perror("open (tempdir)");
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goto rmtemp;
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}
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// Source
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const char src_name[] = "kerouac";
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char src_buf[PATH_MAX] = {0};
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strcpy(src_buf, tempdir_path);
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strcat(src_buf, "/");
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strcat(src_buf, src_name);
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// TODO: Use openat
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int source = open(src_buf, O_CREAT);
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if (source == -1) {
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perror("open");
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goto close_dir;
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}
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// Dest (link)
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const char dst_name[] = "on_the_road";
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char dst_buf[PATH_MAX] = {0};
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strcpy(dst_buf, tempdir_path);
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strcat(dst_buf, "/");
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strcat(dst_buf, dst_name);
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if (symlink(src_buf, dst_buf) == -1) {
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perror("symlink");
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goto rm_source;
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}
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struct stat src_stat = {0};
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if (fstatat(tempdir, dst_name, &src_stat, 0) == -1) {
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perror("fstatat");
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goto rm_dest;
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}
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// Quick consistency check
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uid_t uid = getuid();
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gid_t gid = getgid();
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if (src_stat.st_uid != uid) {
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fprintf(
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stderr,
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"uid:\n\tExpected %ld\n\tActual: %ld\n",
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(intmax_t) uid,
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(intmax_t) gid
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);
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goto rm_dest;
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}
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if (src_stat.st_nlink != 1) {
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fputs("nlink: Expected one hard link\n", stderr);
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goto rm_dest;
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}
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if ((src_stat.st_mode & S_IFMT) != S_IFREG) {
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fputs("mode: Expected a normal file\n", stderr);
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goto rm_dest;
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}
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struct stat dst_stat = {0};
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if (lstat(dst_buf, &dst_stat) == -1) {
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perror("lstat");
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goto rm_dest;
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}
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if (memcmp(&src_stat, &dst_stat, sizeof(struct stat)) == 0) {
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fputs("lstat incorrectly followed the symlink\n", stderr);
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goto rm_dest;
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}
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if ((dst_stat.st_mode & S_IFMT) != S_IFLNK) {
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fputs("lstat did not stat a link\n", stderr);
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goto rm_dest;
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}
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status = EXIT_SUCCESS;
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rm_dest:
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unlink(dst_buf);
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rm_source:
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unlink(src_buf);
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close_dir:
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close(tempdir);
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rmtemp:
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rmdir(tempdir_path);
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bye:
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return status;
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}
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