[PATCH v3 25/41] powerpc/book3s64/kuep: Store/restore userspace IAMR correctly on entry and exit from kernel

kernel test robot lkp at intel.com
Thu Jun 11 10:03:09 AEST 2020 

Hi "Aneesh,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on next-20200610]
[cannot apply to v5.7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/Kernel-userspace-access-execution-prevention-with-hash-translation/20200610-191943
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-randconfig-r006-20200608 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project bc2b70982be8f5250cd0082a7190f8b417bd4dfe)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
In file included from arch/powerpc/include/asm/kup.h:18:
arch/powerpc/include/asm/book3s/64/kup.h:181:24: error: no member named 'kuap' in 'struct pt_regs'
mtspr(SPRN_AMR, regs->kuap);
~~~~  ^
arch/powerpc/include/asm/reg.h:1386:33: note: expanded from macro 'mtspr'
: "r" ((unsigned long)(v))                                                                ^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
In file included from arch/powerpc/include/asm/kup.h:18:
>> arch/powerpc/include/asm/book3s/64/kup.h:182:25: error: no member named 'kuep' in 'struct pt_regs'
mtspr(SPRN_IAMR, regs->kuep);
~~~~  ^
arch/powerpc/include/asm/reg.h:1386:33: note: expanded from macro 'mtspr'
: "r" ((unsigned long)(v))                                                                ^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
In file included from arch/powerpc/include/asm/kup.h:18:
arch/powerpc/include/asm/book3s/64/kup.h:194:22: error: no member named 'kuap' in 'struct pt_regs'
if (unlikely(regs->kuap != amr)) {
~~~~  ^
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x)    __builtin_expect(!!(x), 0)
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
In file included from arch/powerpc/include/asm/kup.h:18:
arch/powerpc/include/asm/book3s/64/kup.h:196:26: error: no member named 'kuap' in 'struct pt_regs'
mtspr(SPRN_AMR, regs->kuap);
~~~~  ^
arch/powerpc/include/asm/reg.h:1386:33: note: expanded from macro 'mtspr'
: "r" ((unsigned long)(v))                                                                ^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
In file included from arch/powerpc/include/asm/kup.h:18:
arch/powerpc/include/asm/book3s/64/kup.h:293:14: error: no member named 'kuap' in 'struct pt_regs'
(regs->kuap & (is_write ? AMR_KUAP_BLOCK_WRITE : AMR_KUAP_BLOCK_READ)),
~~~~  ^
include/asm-generic/bug.h:122:25: note: expanded from macro 'WARN'
int __ret_warn_on = !!(condition);                                                                ^~~~~~~~~
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
arch/powerpc/include/asm/kup.h:56:20: error: redefinition of 'allow_user_access'
static inline void allow_user_access(void __user *to, const void __user *from,
^
arch/powerpc/include/asm/book3s/64/kup.h:254:29: note: previous definition is here
static __always_inline void allow_user_access(void __user *to, const void __user *from,
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
arch/powerpc/include/asm/kup.h:58:20: error: redefinition of 'prevent_user_access'
static inline void prevent_user_access(void __user *to, const void __user *from,
^
arch/powerpc/include/asm/book3s/64/kup.h:269:20: note: previous definition is here
static inline void prevent_user_access(void __user *to, const void __user *from,
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:
arch/powerpc/include/asm/kup.h:60:29: error: redefinition of 'prevent_user_access_return'
static inline unsigned long prevent_user_access_return(void) { return 0UL; }
^
arch/powerpc/include/asm/book3s/64/kup.h:275:29: note: previous definition is here
static inline unsigned long prevent_user_access_return(void)
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:21:
In file included from include/linux/uaccess.h:11:
In file included from arch/powerpc/include/asm/uaccess.h:9:

vim +182 arch/powerpc/include/asm/book3s/64/kup.h

   174	
   175	static inline void kuap_restore_user_amr(struct pt_regs *regs)
   176	{
   177		if (!mmu_has_feature(MMU_FTR_PKEY))
   178			return;
   179	
   180		isync();
   181		mtspr(SPRN_AMR, regs->kuap);
 > 182		mtspr(SPRN_IAMR, regs->kuep);
   183		/*
   184		 * No isync required here because we are about to rfi
   185		 * back to previous context before any user accesses
   186		 * would be made, which is a CSI.
   187		 */
   188	}
   189	static inline void kuap_restore_kernel_amr(struct pt_regs *regs,
   190						   unsigned long amr)
   191	{
   192		if (mmu_has_feature(MMU_FTR_KUAP) || mmu_has_feature(MMU_FTR_PKEY)) {
   193	
   194			if (unlikely(regs->kuap != amr)) {
   195				isync();
   196				mtspr(SPRN_AMR, regs->kuap);
   197				/*
   198				 * No isync required here because we are about to rfi
   199				 * back to previous context before any user accesses
   200				 * would be made, which is a CSI.
   201				 */
   202			}
   203		}
   204		/*
   205		 * No need to restore IAMR when returning to kernel space.
   206		 */
   207	}
   208	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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