linux-kernel - [tip:x86/shstk 31/42] arch/x86/kernel/shstk.c:244:29: sparse: sparse: incorrect type in argument 1 (different address spaces)

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Date:   Thu, 13 Jul 2023 16:47:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        Kees Cook <keescook@...omium.org>
Subject: [tip:x86/shstk 31/42] arch/x86/kernel/shstk.c:244:29: sparse:
 sparse: incorrect type in argument 1 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/shstk
head:   727f2a6ea02467c331f86ec5fde8e70dab418baa
commit: 6bf19cec9a198b8f6af939b5f7bd5d3e721c9e7e [31/42] x86/shstk: Handle signals for shadow stack
config: x86_64-randconfig-x061-20230713 (https://download.01.org/0day-ci/archive/20230713/202307131601.a3YybdUr-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230713/202307131601.a3YybdUr-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/202307131601.a3YybdUr-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/shstk.c:244:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected unsigned long long [noderef] [usertype] __user *addr @@     got void *[noderef] __user @@
   arch/x86/kernel/shstk.c:244:29: sparse:     expected unsigned long long [noderef] [usertype] __user *addr
   arch/x86/kernel/shstk.c:244:29: sparse:     got void *[noderef] __user
>> arch/x86/kernel/shstk.c:295:55: sparse: sparse: cast removes address space '__user' of expression

vim +244 arch/x86/kernel/shstk.c

   234	
   235	static int shstk_push_sigframe(unsigned long *ssp)
   236	{
   237		unsigned long target_ssp = *ssp;
   238	
   239		/* Token must be aligned */
   240		if (!IS_ALIGNED(target_ssp, 8))
   241			return -EINVAL;
   242	
   243		*ssp -= SS_FRAME_SIZE;
 > 244		if (put_shstk_data((void *__user)*ssp, target_ssp))
   245			return -EFAULT;
   246	
   247		return 0;
   248	}
   249	
   250	static int shstk_pop_sigframe(unsigned long *ssp)
   251	{
   252		unsigned long token_addr;
   253		int err;
   254	
   255		err = get_shstk_data(&token_addr, (unsigned long __user *)*ssp);
   256		if (unlikely(err))
   257			return err;
   258	
   259		/* Restore SSP aligned? */
   260		if (unlikely(!IS_ALIGNED(token_addr, 8)))
   261			return -EINVAL;
   262	
   263		/* SSP in userspace? */
   264		if (unlikely(token_addr >= TASK_SIZE_MAX))
   265			return -EINVAL;
   266	
   267		*ssp = token_addr;
   268	
   269		return 0;
   270	}
   271	
   272	int setup_signal_shadow_stack(struct ksignal *ksig)
   273	{
   274		void __user *restorer = ksig->ka.sa.sa_restorer;
   275		unsigned long ssp;
   276		int err;
   277	
   278		if (!cpu_feature_enabled(X86_FEATURE_USER_SHSTK) ||
   279		    !features_enabled(ARCH_SHSTK_SHSTK))
   280			return 0;
   281	
   282		if (!restorer)
   283			return -EINVAL;
   284	
   285		ssp = get_user_shstk_addr();
   286		if (unlikely(!ssp))
   287			return -EINVAL;
   288	
   289		err = shstk_push_sigframe(&ssp);
   290		if (unlikely(err))
   291			return err;
   292	
   293		/* Push restorer address */
   294		ssp -= SS_FRAME_SIZE;
 > 295		err = write_user_shstk_64((u64 __user *)ssp, (u64)restorer);
   296		if (unlikely(err))
   297			return -EFAULT;
   298	
   299		fpregs_lock_and_load();
   300		wrmsrl(MSR_IA32_PL3_SSP, ssp);
   301		fpregs_unlock();
   302	
   303		return 0;
   304	}
   305	

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