linux-hardening - Re: [PATCH 1/1] arm64: syscall: Direct PRNG kstack randomization

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Date: Fri, 8 Mar 2024 03:05:45 +0800
From: kernel test robot <lkp@...el.com>
To: Jeremy Linton <jeremy.linton@....com>,
	linux-arm-kernel@...ts.infradead.org
Cc: oe-kbuild-all@...ts.linux.dev, catalin.marinas@....com, will@...nel.org,
	keescook@...omium.org, Jason@...c4.com, gustavoars@...nel.org,
	mark.rutland@....com, rostedt@...dmis.org, arnd@...db.de,
	broonie@...nel.org, guohui@...ontech.com, Manoj.Iyer@....com,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	Jeremy Linton <jeremy.linton@....com>,
	James Yang <james.yang@....com>,
	Shiyou Huang <shiyou.huang@....com>
Subject: Re: [PATCH 1/1] arm64: syscall: Direct PRNG kstack randomization

Hi Jeremy,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on arm/for-next arm/fixes kvmarm/next soc/for-next linus/master v6.8-rc7 next-20240307]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jeremy-Linton/arm64-syscall-Direct-PRNG-kstack-randomization/20240306-061930
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20240305221824.3300322-2-jeremy.linton%40arm.com
patch subject: [PATCH 1/1] arm64: syscall: Direct PRNG kstack randomization
config: arm64-randconfig-r063-20240307 (https://download.01.org/0day-ci/archive/20240308/202403080244.U8fiY8Dy-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240308/202403080244.U8fiY8Dy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403080244.U8fiY8Dy-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kernel/syscall.c:74:12: warning: 'kstack_rng' defined but not used [-Wunused-function]
      74 | static u16 kstack_rng(void) { return 0; }
         |            ^~~~~~~~~~


vim +/kstack_rng +74 arch/arm64/kernel/syscall.c

    71	
    72	arch_initcall(kstack_init);
    73	#else
  > 74	static u16 kstack_rng(void) { return 0; }
    75	#endif /* CONFIG_RANDOMIZE_KSTACK_OFFSET */
    76	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki