* [arm-integrator:kernel-in-vmalloc-v6.2-rc3-just-ttbr0-split 30/30] arch/arm/include/asm/uaccess.h:54:21: error: implicit declaration of function 'current_user_ttbr'
@ 2023-03-14 13:31 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-03-14 13:31 UTC (permalink / raw)
To: Linus Walleij; +Cc: oe-kbuild-all
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-r013-20230313 (https://download.01.org/0day-ci/archive/20230314/202303142109.ge6LkN2J-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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
# 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=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 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/202303142109.ge6LkN2J-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from arch/arm/include/asm/pgtable.h:25,
from include/linux/pgtable.h:6,
from include/linux/mm.h:29,
from arch/arm/kernel/asm-offsets.c:12:
arch/arm/include/asm/pgtable-nommu.h:49: warning: "ZERO_PAGE" redefined
49 | #define ZERO_PAGE(vaddr) (virt_to_page((const void *)0))
|
arch/arm/include/asm/pgtable.h:19: note: this is the location of the previous definition
19 | #define ZERO_PAGE(vaddr) (empty_zero_page)
|
In file included from include/linux/uaccess.h:11,
from include/linux/sched/task.h:11,
from include/linux/sched/signal.h:9,
from include/linux/rcuwait.h:6,
from include/linux/percpu-rwsem.h:7,
from include/linux/fs.h:33,
from include/linux/huge_mm.h:8,
from include/linux/mm.h:740:
arch/arm/include/asm/uaccess.h: In function 'uaccess_save_and_enable':
>> arch/arm/include/asm/uaccess.h:54:21: error: implicit declaration of function 'current_user_ttbr' [-Werror=implicit-function-declaration]
54 | user_ttbr = current_user_ttbr();
| ^~~~~~~~~~~~~~~~~
arch/arm/include/asm/uaccess.h:55:23: error: implicit declaration of function 'read_sysreg'; did you mean 'read_seqretry'? [-Werror=implicit-function-declaration]
55 | kernel_ttbr = read_sysreg(TTBR1);
| ^~~~~~~~~~~
| read_seqretry
>> arch/arm/include/asm/uaccess.h:55:35: error: 'TTBR1' undeclared (first use in this function)
55 | kernel_ttbr = read_sysreg(TTBR1);
| ^~~~~
arch/arm/include/asm/uaccess.h:55:35: note: each undeclared identifier is reported only once for each function it appears in
arch/arm/include/asm/uaccess.h:56:9: error: implicit declaration of function 'write_sysreg' [-Werror=implicit-function-declaration]
56 | write_sysreg(user_ttbr, TTBR0);
| ^~~~~~~~~~~~
>> arch/arm/include/asm/uaccess.h:56:33: error: 'TTBR0' undeclared (first use in this function)
56 | write_sysreg(user_ttbr, TTBR0);
| ^~~~~
arch/arm/include/asm/uaccess.h: In function 'uaccess_restore':
arch/arm/include/asm/uaccess.h:69:29: error: 'TTBR0' undeclared (first use in this function)
69 | write_sysreg(flags, TTBR0);
| ^~~~~
cc1: some warnings being treated as errors
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
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