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mcctrl: lookup unexported symbols at runtime

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Instead of parsing System.map, use kallsyms_lookup_name() to
get unexported symbols addresses at module loading time.

This lets mckernel work with kaslr enabled (it gets enabled by
default from el7.5 onwards)

Change-Id: Ie4349fc1145ebce44f37f1f40c16f9d75584074d
This commit is contained in:
Dominique Martinet
2018-08-03 13:12:08 +09:00
committed by Masamichi Takagi
parent 794684985f
commit e8f8660b73
10 changed files with 151 additions and 672 deletions
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41
executer/kernel/mcctrl/arch/arm64/archdeps.c
View File

@ -1,6 +1,7 @@
/* archdeps.c COPYRIGHT FUJITSU LIMITED 2016 */
#include <linux/version.h>
#include <linux/mm_types.h>
#include <linux/kallsyms.h>
#include <asm/vdso.h>
#include "../../../config.h"
#include "../../mcctrl.h"
@ -17,29 +18,31 @@
#define D(fmt, ...) printk("%s(%d) " fmt, __func__, __LINE__, ##__VA_ARGS__)
#ifdef MCCTRL_KSYM_vdso_start
# if MCCTRL_KSYM_vdso_start
void *vdso_start = (void *)MCCTRL_KSYM_vdso_start;
# endif
#else
# error missing address of vdso_start.
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
void *vdso_start;
void *vdso_end;
static struct vm_special_mapping (*vdso_spec)[2];
#endif
#ifdef MCCTRL_KSYM_vdso_end
# if MCCTRL_KSYM_vdso_end
void *vdso_end = (void *)MCCTRL_KSYM_vdso_end;
# endif
#else
# error missing address of vdso_end.
int arch_symbols_init(void)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
vdso_start = (void *) kallsyms_lookup_name("vdso_start");
if (WARN_ON(!vdso_start))
return -EFAULT;
vdso_end = (void *) kallsyms_lookup_name("vdso_end");
if (WARN_ON(!vdso_end))
return -EFAULT;
vdso_spec = (void *) kallsyms_lookup_name("vdso_spec");
if (WARN_ON(!vdso_spec))
return -EFAULT;
#endif
#ifdef MCCTRL_KSYM_vdso_spec
# if MCCTRL_KSYM_vdso_spec
static struct vm_special_mapping (*vdso_spec)[2] = (void*)MCCTRL_KSYM_vdso_spec;
# endif
#else
# error missing address of vdso_spec.
#endif
return 0;
}
#ifdef POSTK_DEBUG_ARCH_DEP_52
#define VDSO_MAXPAGES 1