add `krelease()` function (#1673)

pwndbg/gdblib/kernel/__init__.py

@@ -1,5 +1,7 @@
 import functools
 import math
+import re
+from typing import Tuple
 
 import gdb
 
@@ -76,6 +78,15 @@ def kversion() -> str:
     return pwndbg.gdblib.memory.string(version_addr).decode("ascii").strip()
 
 
+@requires_debug_syms()
+@pwndbg.lib.memoize.reset_on_start
+def krelease() -> Tuple[int, ...]:
+    match = re.search(r"Linux version (\d+)\.(\d+)(?:\.(\d+))?", kversion())
+    if match:
+        return tuple(int(x) for x in match.groups() if x)
+    raise Exception("Linux version tuple not found")
+
+
 @requires_debug_syms()
 @pwndbg.lib.memoize.reset_on_start
 def is_kaslr_enabled() -> bool:

tests/qemu-tests/tests/test_qemu_system.py

@@ -13,3 +13,15 @@ try:
 except Exception:
     traceback.print_exc()
     exit(1)
+
+
+try:
+    release_ver = pwndbg.gdblib.kernel.krelease()
+    # release should be int tuple of form (major, minor, patch) or (major, minor)
+    assert len(release_ver) >= 2
+    release_str = "Linux version " + ".".join([str(x) for x in release_ver])
+    assert release_str in pwndbg.gdblib.kernel.kversion()
+
+except Exception:
+    traceback.print_exc()
+    exit(1)