[Xen-devel] [PATCH for-4.13 v4 1/3] xen/flask: Drop the gen-policy.py script

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

The script is Python 2 specific, and fails with string/binary issues with
Python 3:

  Traceback (most recent call last):
    File "gen-policy.py", line 14, in <module>
      for char in sys.stdin.read():
    File "/usr/lib/python3.5/codecs.py", line 321, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8c in position 0: 
invalid start byte

Fixing the script to be compatible isn't hard, but using python here is
wasteful.  Drop the script entirely, and write an equivelent flask-policy.S
instead.  This removes the need for a $(PYTHON) and $(CC) pass.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
CC: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>

v2:
 * Fix tabs vs spaces issues
v3:
 * Use % rather than @ for progbits/object, for Arm32 build.
 * Spotted by https://travis-ci.org/andyhhp/xen/builds/622085138
v4:
 * Introduce and use ASM_INT() to declare something compatible with `int`
 * Drop .align

For 4.13.  This is a blocker to our intent to by Py3-clean in this release.

Discovered entirely accidently when testing the final patch.
---
 xen/include/asm-arm/asm_defns.h |  6 ++++++
 xen/include/asm-x86/asm_defns.h |  6 ++++++
 xen/xsm/flask/Makefile          |  6 ++----
 xen/xsm/flask/flask-policy.S    | 16 ++++++++++++++++
 xen/xsm/flask/gen-policy.py     | 23 -----------------------
 5 files changed, 30 insertions(+), 27 deletions(-)
 create mode 100644 xen/xsm/flask/flask-policy.S
 delete mode 100644 xen/xsm/flask/gen-policy.py

diff --git a/xen/include/asm-arm/asm_defns.h b/xen/include/asm-arm/asm_defns.h
index 3f21def0ab..b4fbcdae1d 100644
--- a/xen/include/asm-arm/asm_defns.h
+++ b/xen/include/asm-arm/asm_defns.h
@@ -21,6 +21,12 @@
 label:  .asciz msg;                             \
 .popsection
 
+#define ASM_INT(label, val)                 \
+    .p2align 2;                             \
+label: .long (val);                         \
+    .size label, . - label;                 \
+    .type label, %object
+
 #endif /* __ARM_ASM_DEFNS_H__ */
 /*
  * Local variables:
diff --git a/xen/include/asm-x86/asm_defns.h b/xen/include/asm-x86/asm_defns.h
index c4f49a35d3..370f239c50 100644
--- a/xen/include/asm-x86/asm_defns.h
+++ b/xen/include/asm-x86/asm_defns.h
@@ -386,4 +386,10 @@ static always_inline void stac(void)
 4:  .p2align 2                            ; \
     .popsection
 
+#define ASM_INT(label, val)                 \
+    .p2align 2;                             \
+label: .long (val);                         \
+    .size label, . - label;                 \
+    .type label, @object
+
 #endif /* __X86_ASM_DEFNS_H__ */
diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile
index f5ffab1226..7c3f381287 100644
--- a/xen/xsm/flask/Makefile
+++ b/xen/xsm/flask/Makefile
@@ -27,7 +27,8 @@ $(FLASK_H_FILES): $(FLASK_H_DEPEND)
 $(AV_H_FILES): $(AV_H_DEPEND)
        $(CONFIG_SHELL) policy/mkaccess_vector.sh $(AWK) $(AV_H_DEPEND)
 
-obj-$(CONFIG_XSM_FLASK_POLICY) += policy.o
+obj-bin-$(CONFIG_XSM_FLASK_POLICY) += flask-policy.o
+flask-policy.o: policy.bin
 
 FLASK_BUILD_DIR := $(CURDIR)
 POLICY_SRC := $(FLASK_BUILD_DIR)/xenpolicy-$(XEN_FULLVERSION)
@@ -36,9 +37,6 @@ policy.bin: FORCE
        $(MAKE) -f $(XEN_ROOT)/tools/flask/policy/Makefile.common -C 
$(XEN_ROOT)/tools/flask/policy FLASK_BUILD_DIR=$(FLASK_BUILD_DIR)
        cmp -s $(POLICY_SRC) $@ || cp $(POLICY_SRC) $@
 
-policy.c: policy.bin gen-policy.py
-       $(PYTHON) gen-policy.py < $< > $@
-
 .PHONY: clean
 clean::
        rm -f $(ALL_H_FILES) *.o $(DEPS_RM) policy.* $(POLICY_SRC)
diff --git a/xen/xsm/flask/flask-policy.S b/xen/xsm/flask/flask-policy.S
new file mode 100644
index 0000000000..e9308aa175
--- /dev/null
+++ b/xen/xsm/flask/flask-policy.S
@@ -0,0 +1,16 @@
+#include <asm/asm_defns.h>
+
+        .section .init.rodata, "a", %progbits
+
+/* const unsigned char xsm_flask_init_policy[] __initconst */
+        .global xsm_flask_init_policy
+xsm_flask_init_policy:
+        .incbin "policy.bin"
+.Lend:
+
+        .type xsm_flask_init_policy, %object
+        .size xsm_flask_init_policy, . - xsm_flask_init_policy
+
+/* const unsigned int __initconst xsm_flask_init_policy_size */
+       .global xsm_flask_init_policy_size
+        ASM_INT(xsm_flask_init_policy_size, .Lend - xsm_flask_init_policy)
diff --git a/xen/xsm/flask/gen-policy.py b/xen/xsm/flask/gen-policy.py
deleted file mode 100644
index c7501e4614..0000000000
--- a/xen/xsm/flask/gen-policy.py
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/env python
-import sys
-
-policy_size = 0
-
-sys.stdout.write("""
-/* This file is autogenerated by gen_policy.py */
-#include <xen/init.h>
-#include <xsm/xsm.h>
-
-const unsigned char xsm_flask_init_policy[] __initconst = {
-""")
-
-for char in sys.stdin.read():
-    sys.stdout.write(" 0x%02x," % ord(char))
-    policy_size = policy_size + 1
-    if policy_size % 13 == 0:
-        sys.stdout.write("\n")
-
-sys.stdout.write("""
-};
-const unsigned int __initconst xsm_flask_init_policy_size = %d;
-""" % policy_size)
-- 
2.11.0


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel