FreeBSD implementation
MODIFY
libtokencap/Makefile
libtokencap/Makefile
@@ -27,6 +27,9 @@ endif
ifeq "$(shell uname)" "Darwin"
TARGETS = libtokencap.so
endif
+ifeq "$(shell uname)" "FreeBSD"
+ TARGETS = libtokencap.so
+endif
all: $(TARGETS)
libtokencap.so: libtokencap.so.c ../config.h

MODIFY
libtokencap/libtokencap.so.c
libtokencap/libtokencap.so.c
#include <stdio.h>
#include <string.h>
#include <ctype.h>
+#include <unistd.h>
#include "../types.h"
#include "../config.h"
-#if !defined(__linux__) && !defined(__APPLE__)
+#if !defined(__linux__) && !defined(__APPLE__) && !defined(__FreeBSD__)
#error "Sorry, this library is unsupported in this platform for now!"
#endif /* !__linux__ */
#if defined(__APPLE__)
#include <mach/vm_map.h>
#include <mach/mach_init.h>
+#elif defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <sys/mman.h>
#endif
/* Mapping data and such */
@@ -102,6 +108,48 @@ static void __tokencap_load_mappings(void) {
}
}
+#elif defined(__FreeBSD__)
+ int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid()};
+ char *buf, *low, *high;
+ size_t miblen = sizeof(mib)/sizeof(mib[0]);
+ size_t len;
+
+ if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) return;
+
+ len = len * 4 / 3;
+ buf = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
+
+ if (sysctl(mib, miblen, buf, &len, NULL, 0) == -1) {
+
+ munmap(buf, len);
+ return;
+
+ }
+
+ low = buf;
+ high = low + len;
+
+ __tokencap_ro_loaded = 1;
+
+ while (low < high) {
+ struct kinfo_vmentry *region = (struct kinfo_vmentry *)low;
+ size_t size = region->kve_structsize;
+
+ if (size == 0) break;
+
+ /* We go through the whole mapping of the process and track read-only addresses */
+ if ((region->kve_protection & KVME_PROT_READ) &&
+ !(region->kve_protection & KVME_PROT_WRITE)) {
+ __tokencap_ro[__tokencap_ro_cnt].st = (void *)region->kve_start;
+ __tokencap_ro[__tokencap_ro_cnt].en = (void *)region->kve_end;
+
+ if (++__tokencap_ro_cnt == MAX_MAPPINGS) break;
+ }
+
+ low += size;
+ }
+
+ munmap(buf, len);
#endif
}

FreeBSD implementation