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-rw-r--r--src/misc/ptrace.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/misc/ptrace.c b/src/misc/ptrace.c
index 1cc00167..f8540698 100644
--- a/src/misc/ptrace.c
+++ b/src/misc/ptrace.c
@@ -8,11 +8,18 @@ long ptrace(int req, ...)
va_list ap;
pid_t pid;
void *addr, *data, *addr2;
+ long ret, result;
+
va_start(ap, req);
pid = va_arg(ap, pid_t);
addr = va_arg(ap, void *);
data = va_arg(ap, void *);
addr2 = va_arg(ap, void *);
va_end(ap);
- return syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+ if (req<4U) data = &result;
+ ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+ if (ret<0 || req>=4U) return ret;
+ return result;
}