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.
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <sched.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "test_helpers.h"
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volatile sig_atomic_t atomic = 0;
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volatile sig_atomic_t atomic2 = 0;
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void action(int sig, siginfo_t *info, void *context) {
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(void)context;
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assert(sig == SIGCHLD);
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assert(info != NULL);
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atomic += 1;
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}
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void handler(int sig) {
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assert(sig == SIGPIPE);
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atomic2 += 1;
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}
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int main(void) {
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int fds[2];
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int status = pipe(fds);
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ERROR_IF(pipe, status, == -1);
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int child = fork();
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ERROR_IF(fork, child, == -1);
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sigset_t set;
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sigemptyset(&set);
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status = sigprocmask(SIG_SETMASK, &set, NULL);
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ERROR_IF(sigprocmask, status, == -1);
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struct sigaction sa;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_sigaction = action;
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status = sigaction(SIGCHLD, &sa, NULL);
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ERROR_IF(sigaction, status, == -1);
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sa.sa_handler = handler;
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status = sigaction(SIGPIPE, &sa, NULL);
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ERROR_IF(sigaction, status, == -1);
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if (child == 0) {
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status = close(fds[1]);
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ERROR_IF(close, status, == -1);
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char buf[1];
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status = read(fds[0], buf, 1);
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ERROR_IF(read, status, == -1);
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puts("Child exiting.");
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return EXIT_SUCCESS;
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} else {
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int waitpid_stat;
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close(fds[0]);
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ERROR_IF(close, status, == -1);
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puts("Sending SIGSTOP...");
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status = kill(child, SIGSTOP);
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ERROR_IF(kill, status, == -1);
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while (atomic == 0) {
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status = sched_yield();
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ERROR_IF(sched_yield, status, == -1);
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}
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puts("First handler ran, checking status.");
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status = waitpid(child, &waitpid_stat, WUNTRACED);
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ERROR_IF(waitpid, status, == -1);
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assert(WIFSTOPPED(waitpid_stat));
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assert(WSTOPSIG(waitpid_stat) == SIGSTOP);
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puts("Correct, sending SIGCONT...");
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status = write(fds[1], "C", 1);
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ERROR_IF(write, status, == -1);
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status = kill(child, SIGCONT);
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ERROR_IF(kill, status, == -1);
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while (atomic == 1) {
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status = sched_yield();
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ERROR_IF(sched_yield, status, == -1);
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}
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puts("Second handler ran, checking status.");
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status = waitpid(child, &waitpid_stat, 0);
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ERROR_IF(waitpid, status, == -1);
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assert(WIFEXITED(waitpid_stat));
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assert(WEXITSTATUS(waitpid_stat) == 0);
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puts("Child exited.");
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puts("Writing to (broken) pipe.");
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status = write(fds[1], "B", 1);
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assert(status == -1);
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assert(errno == EPIPE);
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/*while (atomic2 == 0) {
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status = sched_yield();
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ERROR_IF(sched_yield, status, == -1);
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}*/
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puts("SIGSTOP handler successfully executed.");
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return EXIT_SUCCESS;
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}
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}
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