Re: [PATCH 2/2] x86/KASLR/64: Determine kernel text mapping size at runtime

From: kbuild test robot
Date: Thu Dec 08 2016 - 04:42:33 EST

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Hi Baoquan,

[auto build test ERROR on tip/x86/core]
[also build test ERROR on v4.9-rc8 next-20161208]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Baoquan-He/Determine-kernel-text-mapping-size-at-runtime-for-x86_64/20161208-172019
config: x86_64-randconfig-x017-201649 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All error/warnings (new ones prefixed by >>):

In file included from arch/x86/include/asm/page_types.h:47:0,
from arch/x86/include/asm/page.h:8,
from arch/x86/include/asm/thread_info.h:11,
from include/linux/thread_info.h:58,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/uapi/linux/timex.h:56,
from include/linux/timex.h:56,
from include/linux/sched.h:19,
from arch/x86/kernel/setup.c:24:
arch/x86/kernel/setup.c: In function 'dump_kernel_offset':
arch/x86/include/asm/page_64_types.h:67:29: error: 'kernel_mapping_size' undeclared (first use in this function)
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> include/linux/printk.h:271:35: note: in expansion of macro 'MODULES_VADDR'
printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~
>> arch/x86/kernel/setup.c:826:3: note: in expansion of macro 'pr_emerg'
pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
^~~~~~~~
arch/x86/include/asm/page_64_types.h:67:29: note: each undeclared identifier is reported only once for each function it appears in
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> include/linux/printk.h:271:35: note: in expansion of macro 'MODULES_VADDR'
printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~
>> arch/x86/kernel/setup.c:826:3: note: in expansion of macro 'pr_emerg'
pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
^~~~~~~~
--
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/module.h:9,
from include/linux/moduleloader.h:5,
from arch/x86/kernel/module.c:21:
arch/x86/kernel/module.c: In function 'module_alloc':
arch/x86/include/asm/page_64_types.h:67:29: error: 'kernel_mapping_size' undeclared (first use in this function)
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> arch/x86/kernel/module.c:83:2: note: in expansion of macro 'if'
if (PAGE_ALIGN(size) > MODULES_LEN)
^~
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/pgtable_64_types.h:71:38: note: in expansion of macro 'MODULES_VADDR'
#define MODULES_LEN (MODULES_END - MODULES_VADDR)
^~~~~~~~~~~~~
>> arch/x86/kernel/module.c:83:25: note: in expansion of macro 'MODULES_LEN'
if (PAGE_ALIGN(size) > MODULES_LEN)
^~~~~~~~~~~
arch/x86/include/asm/page_64_types.h:67:29: note: each undeclared identifier is reported only once for each function it appears in
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> arch/x86/kernel/module.c:83:2: note: in expansion of macro 'if'
if (PAGE_ALIGN(size) > MODULES_LEN)
^~
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/pgtable_64_types.h:71:38: note: in expansion of macro 'MODULES_VADDR'
#define MODULES_LEN (MODULES_END - MODULES_VADDR)
^~~~~~~~~~~~~
>> arch/x86/kernel/module.c:83:25: note: in expansion of macro 'MODULES_LEN'
if (PAGE_ALIGN(size) > MODULES_LEN)
^~~~~~~~~~~
--
In file included from include/linux/linkage.h:4:0,
from include/linux/preempt.h:9,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/bootmem.h:7,
from arch/x86/mm/physaddr.c:1:
arch/x86/mm/physaddr.c: In function '__virt_addr_valid':
arch/x86/include/asm/page_64_types.h:67:29: error: 'kernel_mapping_size' undeclared (first use in this function)
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> arch/x86/mm/physaddr.c:53:3: note: in expansion of macro 'if'
if (y >= KERNEL_MAPPING_SIZE)
^~
>> arch/x86/mm/physaddr.c:53:12: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
if (y >= KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/page_64_types.h:67:29: note: each undeclared identifier is reported only once for each function it appears in
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> arch/x86/mm/physaddr.c:53:3: note: in expansion of macro 'if'
if (y >= KERNEL_MAPPING_SIZE)
^~
>> arch/x86/mm/physaddr.c:53:12: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
if (y >= KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
--
In file included from arch/x86/include/asm/page_types.h:47:0,
from arch/x86/include/asm/page.h:8,
from arch/x86/include/asm/thread_info.h:11,
from include/linux/thread_info.h:58,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/wait.h:8,
from include/linux/fs.h:5,
from include/linux/debugfs.h:18,
from arch/x86/mm/dump_pagetables.c:15:
arch/x86/mm/dump_pagetables.c: In function 'pt_dump_init':
arch/x86/include/asm/page_64_types.h:67:29: error: 'kernel_mapping_size' undeclared (first use in this function)
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/dump_pagetables.c:445:52: note: in expansion of macro 'MODULES_VADDR'
address_markers[MODULES_VADDR_NR].start_address = MODULES_VADDR;
^~~~~~~~~~~~~
arch/x86/include/asm/page_64_types.h:67:29: note: each undeclared identifier is reported only once for each function it appears in
#define KERNEL_MAPPING_SIZE kernel_mapping_size
^
>> arch/x86/include/asm/pgtable_64_types.h:69:48: note: in expansion of macro 'KERNEL_MAPPING_SIZE'
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_MAPPING_SIZE)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/dump_pagetables.c:445:52: note: in expansion of macro 'MODULES_VADDR'
address_markers[MODULES_VADDR_NR].start_address = MODULES_VADDR;
^~~~~~~~~~~~~

vim +/kernel_mapping_size +67 arch/x86/include/asm/page_64_types.h

61 * the next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S).
62 * Use 512MiB by default, leaving 1.5GiB for modules once the page tables
63 * are fully set up. If kernel ASLR is configured, it can extend the
64 * kernel page table mapping, reducing the size of the modules area.
65 */
66 #define KERNEL_MAPPING_SIZE_EXT (1024 * 1024 * 1024)
> 67 #define KERNEL_MAPPING_SIZE kernel_mapping_size
68
69 #endif /* _ASM_X86_PAGE_64_DEFS_H */

---
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