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Date: Thu, 16 Aug 2018 15:15:02 +0800
From: kbuild test robot <lkp@...el.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: kbuild-all@...org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com, daniel@...earbox.net,
jannh@...gle.com, keescook@...omium.org, kristen@...ux.intel.com,
dave.hansen@...el.com, arjan@...ux.intel.com,
Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH v3 2/3] x86/modules: Increase randomization for modules
Hi Rick,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.18 next-20180815]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Rick-Edgecombe/KASLR-feature-to-randomize-each-loadable-module/20180816-120750
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=um SUBARCH=x86_64
Note: the linux-review/Rick-Edgecombe/KASLR-feature-to-randomize-each-loadable-module/20180816-120750 HEAD 7eff11788897c8579f53bc7043f854794dbad25f builds fine.
It only hurts bisectibility.
All error/warnings (new ones prefixed by >>):
arch/x86/um/../kernel/module.c: In function 'kaslr_randomize_each_module':
>> arch/x86/um/../kernel/module.c:53:9: error: implicit declaration of function 'kaslr_enabled' [-Werror=implicit-function-declaration]
return kaslr_enabled()
^~~~~~~~~~~~~
arch/x86/um/../kernel/module.c: In function 'get_modules_rand_len':
>> arch/x86/um/../kernel/module.c:68:9: error: 'MODULES_RAND_LEN' undeclared (first use in this function); did you mean 'MODULE_NAME_LEN'?
return MODULES_RAND_LEN;
^~~~~~~~~~~~~~~~
MODULE_NAME_LEN
arch/x86/um/../kernel/module.c:68:9: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/um/../kernel/module.c:69:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
cc1: some warnings being treated as errors
vim +/kaslr_enabled +53 arch/x86/um/../kernel/module.c
50
51 static inline int kaslr_randomize_each_module(void)
52 {
> 53 return kaslr_enabled()
54 && IS_ENABLED(CONFIG_RANDOMIZE_BASE)
55 && IS_ENABLED(CONFIG_X86_64);
56 }
57
58 static inline int kaslr_randomize_base(void)
59 {
60 return kaslr_enabled()
61 && IS_ENABLED(CONFIG_RANDOMIZE_BASE)
62 && !IS_ENABLED(CONFIG_X86_64);
63 }
64
65 #ifdef CONFIG_X86_64
66 static inline const unsigned long get_modules_rand_len(void)
67 {
> 68 return MODULES_RAND_LEN;
> 69 }
70 #else
71 static inline const unsigned long get_modules_rand_len(void)
72 {
73 BUILD_BUG();
74 return 0;
75 }
76 #endif
77
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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