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.
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define SHARED_LIB "sharedlib.so"
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int add(int a, int b) { return a + b; }
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void test_dlopen_null() {
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void *handle = dlopen(NULL, RTLD_LAZY);
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if (!handle) {
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printf("dlopen(NULL) failed: %s\n", dlerror());
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exit(1);
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}
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int (*f)(int, int);
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*(void **)(&f) = dlsym(handle, "add");
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if (!f) {
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printf("dlsym(handle, add) failed: %s\n", dlerror());
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exit(2);
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}
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int a = 22;
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int b = 33;
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printf("add(%d, %d) = %d\n", a, b, f(a, b));
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dlclose(handle);
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}
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void test_dlopen_libc() {
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void *handle = dlopen("libc.so.6", RTLD_LAZY);
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if (!handle) {
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printf("dlopen(libc.so.6) failed\n");
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exit(1);
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}
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int (*f)(const char *);
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*(void **)(&f) = dlsym(handle, "puts");
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if (!f) {
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printf("dlsym(handle, puts) failed\n");
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exit(2);
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}
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f("puts from dlopened libc");
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dlclose(handle);
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}
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void test_dlsym_function() {
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void *handle = dlopen(SHARED_LIB, RTLD_LAZY);
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if (!handle) {
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printf("dlopen(sharedlib.so) failed\n");
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exit(1);
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}
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void (*f)();
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*(void **)(&f) = dlsym(handle, "print");
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if (!f) {
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printf("dlsym(handle, print) failed\n");
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exit(2);
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}
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f();
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dlclose(handle);
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}
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void test_dlsym_global_var() {
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void *handle = dlopen(SHARED_LIB, RTLD_LAZY);
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if (!handle) {
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printf("dlopen(sharedlib.so) failed\n");
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exit(1);
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}
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int *global_var = dlsym(handle, "global_var");
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if (!global_var) {
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printf("dlsym(handle, global_var) failed\n");
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exit(2);
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}
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printf("main: global_var == %d\n", *global_var);
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dlclose(handle);
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}
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void test_dlsym_tls_var() {
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void *handle = dlopen(SHARED_LIB, RTLD_LAZY);
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if (!handle) {
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printf("dlopen(sharedlib.so) failed\n");
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exit(1);
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}
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int *tls_var = dlsym(handle, "tls_var");
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if (!tls_var) {
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printf("dlsym(handle, tls_var) failed\n");
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exit(2);
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}
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printf("main: tls_var == %d\n", *tls_var);
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dlclose(handle);
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}
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void test_dlunload(void) {
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void *handle = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_LOCAL);
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void *handle2 = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_LOCAL);
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assert(handle == handle2 && handle);
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assert(!dlclose(handle));
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void *handle3 = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_NOLOAD);
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assert(handle3 == handle2);
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assert(!dlclose(handle3));
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assert(!dlclose(handle2));
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void *handle4 = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_NOLOAD);
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assert(handle4 == NULL);
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void *handle5 = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_GLOBAL);
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assert(handle5);
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assert(!dlclose(handle5));
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void *handle6 = dlopen(SHARED_LIB, RTLD_LAZY | RTLD_NOLOAD);
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assert(handle6 == NULL);
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}
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int main() {
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test_dlopen_null();
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test_dlopen_libc();
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test_dlsym_function();
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test_dlsym_global_var();
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test_dlsym_tls_var();
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test_dlunload();
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}
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