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authorJari Vetoniemi <mailroxas@gmail.com>2018-11-18 07:37:09 +0200
committerJari Vetoniemi <mailroxas@gmail.com>2018-11-18 07:37:09 +0200
commit38966a58203355d6040e9487f07d8f8289333ebe (patch)
treef6d6be2dd6dabe305b0a73acd6cad353dafed83d /src
parent82c61a906ec290f7404df291f83c1910cf45135c (diff)
add src/libc-antiantidebug.c
Diffstat (limited to 'src')
-rw-r--r--src/libc-antiantidebug.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/src/libc-antiantidebug.c b/src/libc-antiantidebug.c
new file mode 100644
index 0000000..940f6a1
--- /dev/null
+++ b/src/libc-antiantidebug.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+
+int
+bionic_open(const char *path, int oflag, ...)
+{
+ // Hide TracerPid from /proc/self/status for hideous apps that check for debugger.
+ // Note, since /proc/self/status doesn't get updated anymore, this may break some stuff.
+ // XXX: Turn this ON/OFF with env var maybe?
+ if (!strcmp(path, "/proc/self/status")) {
+ static FILE *faked = NULL;
+
+ if (!faked) {
+ static char status[4096];
+
+ {
+ FILE *f = fopen(path, "rb");
+ assert(f && "/proc/self/status failed to open :/");
+ const size_t ret = fread(status, 1, sizeof(status), f);
+ assert(ret <= sizeof(status) && "/proc/self/status doesn't fit in 4096 bytes :/");
+ fclose(f);
+ }
+
+ for (char *s, *e; (s = strstr(status, "TracerPid:\t"));) {
+ for (e = s; (size_t)(e - status) < sizeof(status) && *e && *e != '\n'; ++e);
+ memmove(s, e, sizeof(status) - (e - status));
+ break;
+ }
+
+ printf("%s\n", status);
+ faked = fmemopen(status, sizeof(status), "rb");
+ assert(faked && "fmemopen failed :/");
+ }
+
+ return fileno(faked);
+ }
+
+ return open(path, oflag);
+}