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/* Test if /proc/{self,$PID}/auxv is correctly simulated and that the aux
vector contains plausible values. */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/auxv.h>
#include <sys/fcntl.h>
static int check_file(const char *path, auxv_t *auxv)
{
auxv_t rauxv;
int res = 1;
FILE *fi;
if (!(fi = fopen(path, "r"))) {
perror("fopen");
return 1;
}
while (1) {
if (fread(&rauxv, sizeof(rauxv), 1, fi) != 1) {
if (ferror(fi)) {
perror("fread");
goto out;
}
fprintf(stderr, "unexpected EOF\n");
goto out;
}
if (memcmp(auxv, &rauxv, sizeof(rauxv))) {
fprintf(stderr, "incorrect auxv in %s\n", path);
fprintf(stderr, "expected: type=%d, val=%ld\n", auxv->a_type,
auxv->a_un.a_val);
fprintf(stderr, "got: type=%d, val=%ld\n", rauxv.a_type,
rauxv.a_un.a_val);
goto out;
}
if (auxv->a_type == AT_NULL)
break;
auxv++;
}
res = 0;
out:
fclose(fi);
return res;
}
int main(int argc, char *argv[], char *envp[])
{
auxv_t *auxv;
char buf[128];
/* Find aux vector. */
while (*envp)
envp++;
auxv = (auxv_t*)(envp + 1);
/* /proc/self/auxv check */
if (check_file("/proc/self/auxv", auxv))
return 1;
/* /proc/$PID/auxv check */
snprintf(buf, sizeof(buf), "/proc/%ld/auxv", (long)getpid());
if (check_file(buf, auxv))
return 1;
/* AT_SUN_EXECNAME check */
while (auxv->a_type != AT_NULL) {
if (auxv->a_type == AT_SUN_EXECNAME) {
const char *execname = auxv->a_un.a_ptr;
if (!execname) {
fprintf(stderr, "AT_SUN_EXECNAME is null\n");
return 1;
}
if (access(execname, R_OK | X_OK)) {
fprintf(stderr, "AT_SUN_EXECNAME (%s) is invalid: %s\n",
execname, strerror(errno));
return 1;
}
break;
}
auxv++;
}
return 0;
}
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