catching current pid before library usage in case implementations rely on those string calls
MODIFY
libtokencap/libtokencap.so.c
libtokencap/libtokencap.so.c
@@ -51,6 +51,7 @@ static struct mapping { void *st, *en; } __tokencap_ro[MAX_MAPPINGS];
static u32 __tokencap_ro_cnt;
static u8 __tokencap_ro_loaded;
static int __tokencap_out_file = -1;
+static pid_t __tokencap_pid = -1;
/* Identify read-only regions in memory. Only parameters that fall into these
ranges are worth dumping when passed to strcmp() and so on. Read-write
@@ -115,11 +116,11 @@ static void __tokencap_load_mappings(void) {
#elif defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
#if defined __FreeBSD__
- int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, -1};
+ int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, __tokencap_pid};
#elif defined __OpenBSD__
- int mib[] = {CTL_KERN, KERN_PROC_VMMAP, getpid()};
+ int mib[] = {CTL_KERN, KERN_PROC_VMMAP, __tokencap_pid};
#elif defined __NetBSD__
- int mib[] = {CTL_VM, VM_PROC, VM_PROC_MAP, getpid(), sizeof(struct kinfo_vmentry)};
+ int mib[] = {CTL_VM, VM_PROC, VM_PROC_MAP, __tokencap_pid, sizeof(struct kinfo_vmentry)};
#endif
char *buf, *low, *high;
size_t miblen = sizeof(mib)/sizeof(mib[0]);
@@ -431,6 +432,7 @@ __attribute__((constructor)) void __tokencap_init(void) {
u8* fn = getenv("AFL_TOKEN_FILE");
if (fn) __tokencap_out_file = open(fn, O_RDWR | O_CREAT | O_APPEND, 0655);
if (__tokencap_out_file == -1) __tokencap_out_file = STDERR_FILENO;
+ __tokencap_pid = getpid();
}

catching current pid before library usage in case implementations rely on those string calls