From: kernel test robot <lkp@intel.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [arm-integrator:kernel-in-vmalloc-v6.2-rc3-just-ttbr0-split 30/30] arch/arm/include/asm/uaccess.h:54:14: error: call to undeclared function 'current_user_ttbr'; ISO C99 and later do not support implicit function declarations
Date: Tue, 14 Mar 2023 22:43:23 +0800 [thread overview]
Message-ID: <202303142222.QT4VREFq-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git kernel-in-vmalloc-v6.2-rc3-just-ttbr0-split
head: 8c7a9ba4d5ab142c56f970395de2c419dbcd0a72
commit: 8c7a9ba4d5ab142c56f970395de2c419dbcd0a72 [30/30] switch PGD/TTBR0 in <asm/uaccess-asm.h>
config: arm-randconfig-r046-20230312 (https://download.01.org/0day-ci/archive/20230314/202303142222.QT4VREFq-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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 arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git/commit/?id=8c7a9ba4d5ab142c56f970395de2c419dbcd0a72
git remote add arm-integrator https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git
git fetch --no-tags arm-integrator kernel-in-vmalloc-v6.2-rc3-just-ttbr0-split
git checkout 8c7a9ba4d5ab142c56f970395de2c419dbcd0a72
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303142222.QT4VREFq-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from arch/arm/kernel/asm-offsets.c:12:
In file included from include/linux/mm.h:29:
In file included from include/linux/pgtable.h:6:
In file included from arch/arm/include/asm/pgtable.h:25:
arch/arm/include/asm/pgtable-nommu.h:49:9: warning: 'ZERO_PAGE' macro redefined [-Wmacro-redefined]
#define ZERO_PAGE(vaddr) (virt_to_page((const void *)0))
^
arch/arm/include/asm/pgtable.h:19:9: note: previous definition is here
#define ZERO_PAGE(vaddr) (empty_zero_page)
^
In file included from arch/arm/kernel/asm-offsets.c:12:
In file included from include/linux/mm.h:740:
In file included from include/linux/huge_mm.h:8:
In file included from include/linux/fs.h:33:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:9:
In file included from include/linux/sched/task.h:11:
In file included from include/linux/uaccess.h:11:
>> arch/arm/include/asm/uaccess.h:54:14: error: call to undeclared function 'current_user_ttbr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
user_ttbr = current_user_ttbr();
^
>> arch/arm/include/asm/uaccess.h:55:16: error: call to undeclared function 'read_sysreg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kernel_ttbr = read_sysreg(TTBR1);
^
>> arch/arm/include/asm/uaccess.h:55:28: error: use of undeclared identifier 'TTBR1'
kernel_ttbr = read_sysreg(TTBR1);
^
>> arch/arm/include/asm/uaccess.h:56:2: error: call to undeclared function 'write_sysreg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
write_sysreg(user_ttbr, TTBR0);
^
>> arch/arm/include/asm/uaccess.h:56:26: error: use of undeclared identifier 'TTBR0'
write_sysreg(user_ttbr, TTBR0);
^
arch/arm/include/asm/uaccess.h:69:2: error: call to undeclared function 'write_sysreg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
write_sysreg(flags, TTBR0);
^
arch/arm/include/asm/uaccess.h:69:22: error: use of undeclared identifier 'TTBR0'
write_sysreg(flags, TTBR0);
^
1 warning and 7 errors generated.
make[2]: *** [scripts/Makefile.build:114: arch/arm/kernel/asm-offsets.s] Error 1
make[2]: Target 'prepare' not remade because of errors.
make[1]: *** [Makefile:1286: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:242: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.
vim +/current_user_ttbr +54 arch/arm/include/asm/uaccess.h
28
29 /*
30 * These two functions allow hooking accesses to userspace to increase
31 * system integrity by ensuring that the kernel can not inadvertantly
32 * perform such accesses (eg, via list poison values) which could then
33 * be exploited for priviledge escalation.
34 */
35 static __always_inline unsigned int uaccess_save_and_enable(void)
36 {
37 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
38 unsigned int old_domain = get_domain();
39
40 /* Set the current domain access to permit user accesses */
41 set_domain((old_domain & ~domain_mask(DOMAIN_USER)) |
42 domain_val(DOMAIN_USER, DOMAIN_CLIENT));
43
44 return old_domain;
45 #else
46 /*
47 * Intended semantics: switch to the userspace MM context (enable
48 * userspace), then return (save) the previous kernelspace TTBR0
49 * value.
50 */
51 /* FIXME: ifdef CONFIG_VMSPLIT_4G_4G */
52 u64 user_ttbr, kernel_ttbr;
53
> 54 user_ttbr = current_user_ttbr();
> 55 kernel_ttbr = read_sysreg(TTBR1);
> 56 write_sysreg(user_ttbr, TTBR0);
57
58 return kernel_ttbr;
59 #endif
60 }
61
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
reply other threads:[~2023-03-14 14:43 UTC|newest]
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